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DEIR_SJHTC_TECHINCAL_REPORTS_2-5
6-kr,,� -,� " 0 . CITY ©P NEWPORT BEACH , "n PLANNING DEPARTMENT 3300 NEWPORT BOULEVARD NEWPORT BEACH, CALIFORNIA 92659-1768 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR DRAFT ENVIRONMENTAL IMPACT REPORT/ ENVIRONMENTAL IMPACT STATEMENT. TECHNICAL REPORT NO. 2 HYDROLOGICAL TECHNICAL STUDIES Floodplain Hydraulic Study Conceptual Drainage Study Water Quality Analysis 1 1 1 1 a r l r f TECHNICAL MEMORANDUM TM 3-22 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR FLOODPLAIN HYDRAULIC STUDY April 9, 1990 Revised July 17, 1990 Prepared by: Shahab Nazarie/C. T. Bathala CDPr Actions: A=oY*�-r �A,-� % Project Manager: 7�Z Ap oved Date Director of Engineering: (Iz 7i7 0 roved"'DaCte Project Director: -_ 1 u D proved ate ISCOR0130.0HAmec Revised 4-9-9A SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR FLOODPLAIN HYDRAULIC STUDY STATE ROUTE 73 TABLE OF CONTENTS 1. Geographic Location ................................... 1 2. Project Description .................................... 1 3. Hydrologic Setting ...................................... 1 3.1 Topography .................................. 1 3.2 Precipitation ............................... 4 3.3 Runoff ...................................... 4 3.4 Groundwater ................................. 6 4. Floodplain Studies ............................... 6 4.1 Encroachment on Floodplains ................. 7 4.2 Floodplain Maps for Study Area ............... 7 5, Corridor Impact on Floodplains ................... 7 ' 5.1 Caltrans Guidelines Supplementing Executive Order 11988 Floodplain Management .. ► p q ........ 24 5.1.1 Risks Associated with Implementation of the Action ........................ 24 5.1.2 Impacts on natural and beneficial Floodplain Values .................... 24 5.1.3 Support of Probable Incompatible Floodplain Development ............... 24 5.1.4 Measures to Minimize Floodplain Impacts Associated with the Action ... 24 1 5.2 Increased Runoff to Major Drainage Crossings from Corridor or Roadway Surface 25 5.3 Park and Ride Facilities .................... 25 5.4 Alternatives to Avoid Encroachment........... 26 6. Proposed Cross Drainage Structures ............... 27 SCOR0130.OHAmec Revised 4-9-90 1 l i r LIST OF TABLES 1. List of Flood Insurance Rate Maps ........... 8 2. Summary of Floodplain Crossings .............. 21 3. Summary of Floodplain Encroachment .......... 22-23 4. Summary of Major Stream Crossings ........... 28 5. Peak 100-year Flows and Greatest Floods.of Record ....................................... 29 LIST OF FIGURES 1. Geographic Location ......................... 2 2. Project layout .............................. 3 3. Major Drainage Channel Crossings ............ 5 4. Floodway Schematic .......................... 9 5. Index of Flood Insurance Rate Maps .......... 10 6. San Diego Creek Floodplain Boundary.......... 11 7. Bonita and Coyote Canyon Creeks' Floodplain Boundaries ................................... 12 8. Laguna Canyon Channel and El Toro Creek Floodplain Boundaries......... ................ 13 9. Aliso Creek and Narco Channel Floodplain Boundaries ................................... 14 10. Oso Creek Floodplain Boundary ................ 15 11. Trabuco Creek Floodplain Boundary............ 16 12. Horno Creek Floodplain Boundary .............. 17 SCOR0130.OHAmec Revised 4-9-90 L TM 3-18 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR It FLOODPLAIN HYDRAULIC STUDY Cd 1. GEOGRAPHIC LOCATION The proposed San Joaquin Hills Transportation Corridor (SJHTC), or State Route 73 will be the extension of the -existing Corona Del Mar Freeway. It will traverse the western portion of Orange County from Jamboree Road in the city of Newport Beach to Interstate 5 in the City of San Juan Capistrano. The project will also entail widening the portion of I-5 from the junction of SJHTC to the vicinity of Ortega Highway (-SR-74). Figure 1 shows the project location within the County of Orange. The Corridor will pass through the Cities of Newport Beach, Irvine, Laguna Beach, Laguna Niguel, and San Juan Capistrano in addition to unincorporated areas of Orange County. 2. PROJECT DESCRIPTION The overall length of the Corridor is.19..4 miles; 14.5 miles of new location construction, 4.2 miles of widening on Interstate 5, and 0.7 miles of widening on SR-73. The -current concept for the San Joaquin Hills Transportation Corridor provides a six -lane facility, with auxiliary or climbing lanes where necessary, for the general purpose traffic. Figure 2 shows the preliminary alignment of the Corridor. A. median of sufficient width will be utilized in the future for transit considerations such as High Occupancy Vehicles (HOV) or light rail. 3. HYDROLOGIC SETTING 3.1 Topography The Corridor lies in the San Joaquin Hills and Sheep -'Hills, which together extend from Newport Beach .to San Juan Capistrano. The typical topography consists of rolling hillsides, a few steep ridges, narrow alluvial basins, and canyon bottoms_. Major, topographic relief ranges from 200 to 1,200 feet throughout the Corridor's length. Large canyons, arroyos and ridges are oriented in a north -south direction, and major watersheds drain towards the Pacific Ocean. Along the interior portion of the Corridor's alignment, valleys and gently rolling hills are aligned in a northwest to southwest direction. SCOR0130.0HAmec 1 Revised 4-9-90 ROUTE 73 San Joaquin Hills Transportation Corridor Los Angeles Co. San usme TL"n ZIN SAN JOAQUIN HILLS-. TRANSPORTATION CORRIDOR 0 1 2 3 4 5 0 7 Orange Cc" San Bernardino Co. I i Riverside Co. / EASTERN W TRANSP40ORTAM601 CORRIDOR % Cleveland Hadonai LISMLI*,-- % Forest El Toro % ------ FOOTHILL TRANSPORTATION CORRIDOR ........... 74 j /San Diego Co. Figure 1 - Geographic Location 2 SW02-90 1 1 ct cc GAS O i 4 3.2 Precipitation The project site has a Mediterranean type climate characterized by long, dry summers and mild winters. The average annual precipitation is 13 inches and increases to 1s inches in the higher elevations. The major portion of precipitation occurs during the period from November through March, with little or no rain from May through October. Three types of storms produce precipitation in the area: general winter storms, thunderstorms and tropical cyclones. Most past flooding has been caused by high intensity rainfall associated with general winter storms. Flood flow stages can rise from nearly dry streambeds to extreme flood peaks in a matter of hours. 3.3 Runoff The study area is drained by several major watersheds. Figure 3 shows the major watercourses crossing the Corridor alignment. The San Diego Creek drainage basin begins in the San Joaquin Hills to the south and the Santiago Hills to the north. The main channel in this watershed flows westerly into the Tustin Plain and then flows southerly and eventually discharges into upper Newport Bay. The major tributary located within this watershed which crosses the Corridor is Bonita Canyon. The tributary area of Laguna Canyon is made up of steep canyons with fairly impervious soil. The area at the present is mostly undeveloped. The main channel flows from north to south parallel to Laguna Canyon Road. At present, the valley below the future Corridor site is subject to regular flooding. The existing channel adjacent to Route 133 is an earth ditch 3 feet deep and 5 feet wide grown over with heavy brush and vegetation. The major tributary within this watershed which crosses the Corridor is the Niguel Creek Channel. The Aliso Creek watershed begins at the southwest facing slopes of the Santa Ana Mountain range, in the Cleveland National Forest, and extends down into the urbanized portions of Laguna Hills. The basin is composed of steep upper canyons with no drainage improvements, covered with brush and trees, and moderate slopes in the lower canyons with extensive storm drain improvements and large residential and commercial land use elements. The major tributary within this watershed which crosses the Corridor is Narco Channel. Trabuco Creek crosses the existing San Diego Freeway (I-5) in the City of San Juan Capistrano. Although this channel does not cross the SJHTC, the portion of I-5 over the Trabuco Creek will SCOR0130.OHAmec 4 Revised 4-9-90 1 1 1 1 1 1 1 1 l 1 1 s UN W co cc cc =0 cc V E cc IC ty V i us N =0 us ca 0= �Z be widened as part of the SJHTC Project. The major tributary of this channel crossing the Corridor is Oso Creek Channel. Horno Creek crosses the existing I-5 freeway approximately 2,000 feet north of Ortega Highway. The drainage basin for Horno Creek rises in the hills adjacent to Plano Trabuco. The main channel in the watershed flows southwesterly where it eventually joins San Juan Creek in the City of San Juan Capistrano. 3.4 Groundwater Groundwater conditions in the Orange County area are influenced by the natural hydrologic conditions of rainfall, seepage from the underground reservoir and natural stream flows. The area is also influenced by the artificial conditions of groundwater extractions through wells, use of imported waters for replenishment of groundwater supplies and water conservation practices. Infiltration of water applied to landscaped areas, irrigation return flows and possibly the upward percolation from the deeper main aquifer contribute to water levels located within the shallow groundwater zone. A number of relatively small groundwater basins, the largest associated with the San Juan and Aliso Creek drainage systems, are found in the Corridor area. The groundwater capacity of Oso Creek is small and of limited use because of contributions from base formations. In general, groundwater quality declines as it flows toward the ocean. Water levels in the basins are relatively close to the surface in the vicinity of the Corridor. The safe yield from groundwater within the entire Aliso Creek watershed has been estimated to be about 1,500 acre-feet/year. In recent years, importation of water to the basin has reduced the demand on the local watershed, allowing natural replenishment and rise in groundwater levels. However, groundwater quality has been declining because of irrigation return and the marine origin of the formations in the lower basin. Groundwater bearing formations in Laguna Canyon are small and shallow, and the water is unsuitable for municipal needs in terms of quality, quantity and economic feasibility. 4. FLOODPLAIN STUDIES As part of the National Flood Insurance Program (NFIP), flood - plain studies have been performed for various communities in orange County. In order to provide a national standard without regional discrimination, the 100-year flood has been adopted by the Federal Insurance Administration as the base flood for purposes of floodplain management measures. The 500-year flood is employed to indicate additional areas of flood risk in the community. The results of these studies are presented in the form of floodplain boundary maps and Flood Insurance Rate Maps SCOR0130.OHAmec 6 Revised 4-9-90 1 \ (FIRMs). These maps contain official delineation of flood insurance zones and base flood elevation lines. 4.1 Encroachment on Floodplains Encroachment on floodplains by constructing levees, road embankments, buildings, etc., reduces the flood carrying capacity and increases flood stages. Consequently, flood hazards increase in these areas even beyond the encroachment -itself. One of the objectives of floodplain management involves balancing the economic gain from floodplain development against the resulting damage due to increase in flood hazard. The National Flood Insurance Program has introduced the concept of floodway and floodway fringe to assist local communities in floodplain management. The floodway is the channel of a stream, including any adjacent floodplain areas.that must be kept free of encroachment in order that the 100-year flood be carried without substantial increase in flood heights. The floodway fringe is the area between the floodway and the 100-year floodplain boundary, within which any approved encroachment may take place. According to the guidelines established by the Federal Insurance Administration (FIA), the increase.in flood height in the floodway due to any encroachment in the floodway fringe area may not exceed 1.0 (one) foot, provided that hazardous velocities are not produced in the water body. Typical relationships between the floodway and the floodway fringe areas are shown in Figure 4. Floodway encroachment policies of the Orange County Environmental Management Agency (OCEMA) are more stringent than those of Federal Insurance Administration. Accordingly, the county ' guidelines specify that the mean stream velocity will not exceed- 10 feet per second as a result of encroachment on the floodplains, except in short segments. A maximum average water surface rise of one foot, however, is permitted where velocities do not exceed the specified limit. 4.2 Floodplain Maps for Study .Area The project alignment was plotted on the FIRMs for project site. This helped to identify the floodplain boundaries which would be affected by the SJHTC and the I-5 widening. Figure 5 shows the index map of the rate maps covering the study area. A brief description of the areas and streams on each -panel is provided in Table 1. Figures 6 through 12-are-"the detailed FIRMs for each floodplain area along the Corridor alignment. 5. CORRIDOR IMPACT ON FLOODPLAINS The Corridor crosses portions of the floodplains generated by San Diego Creek, Bonita Creek, Coyote Canyon Wash, Laguna Canyon Channel, E1 Toro Canyon, Aliso Creek and Oso,Creek. Additional floodplains traversed by the project are Trabuco and Horno Creeks which cross the portion of I-5 slated for widening as part of construction of the Corridor. The roadway elevations at these SCOR0130.OHAmec 7 Revised 4-9-90 I� TABLE 1 1 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR LIST OF FLOOD INSURANCE RATE MAPS Panel No. Description 06059C0047 E Orange County unincorporated areas, portions (47 of 81) of cities of Irvine, Newport Beach, including San Diego Creek, Bonita Creek, Lane Channel and Upper Newport Bay. Also portions of City of Costa Mesa, including Santa Ana Delhi Channel and Paularino Channel. 06059C0055 E Orange County unincorporated areas, including (55 of 81) San Joaquin Reservoir and Buck Gully, City of Costa Mesa, City of Newport Beach, including portions of Pacific Ocean, Upper Newport Bay, Lower Newport Bay, Big Canyon and Big Canyon Reservoir, and City of Irvine including, Bonita Creek, Coyote Canyon Wash, and Buck Gully. 06059C0056 E Orange County unincorporated areas including (56 of 81) Buck Gully, plus portions of City of Irvine, including Bonita Creek, Coyote Canyon Wash, Sand Canyon Wash, Shady Canyon Wash, and Sand Canyon Reservoir. 06059C0063 E Orange County unincorporated areas including (63 of 81) portions of Pacific Ocean and Niguel Canyon, and portions of City of Laguna Beach including Laguna Canyon. 06059C0064 E Orange County unincorporated areas, including (64 of 81) Aliso Creek and Wood Canyon, and parts of City of Laguna Beach, including Laguna Canyon and Niguel Creek. 06059C0065 E Orange County unincorporated areas including (65 of 81) Trabuco Creek, Tijeras Canyon, and Oso Creek and portions of City of Mission Viejo including Oso Creek and La Paz Channel. 06059C0071 E Orange County unincorporated areas, Cities of (71 of 81) Mission Viejo and San Juan Capistrano, including Oso Creek, Trabuco Creek, Horno Creek and San Juan Creek. 06059C0075 E Orange County unincorporated areas including San Juan Canyon, City of San Juan Capistrano and City of Dana Point including portions of San Juan Creek, Arroyo Trabuco, and Horno Creek, and City of San Clemente including portions of Prima Deshecha Canada. SCOR0130.OHAmec 8 Revised 4-9-90 Odin" FLOOD PLAIN _ 1 FLOODWAY10 do FLOODWAY FLOODWAY FRINGE FRINGE . >ITIIEAM CHANNEL FLOOD ELEVATION wNEN CONFINED we r IN FLOODWAY ENCROACHMENT ACHM ::. •:::.:.:.�.:•,, :;:;:•r:•'•'Ctititii v tYRCNA1tOE :•i:•..�.• AREA OF FLOOD FLAW THAT COULD �� O ELEVATION EY FLOOD PLAINACtIMSur I•IAISINti GROUNOELOrMEMT ON LINE AS 12 THE FLOOD ELEVATION •EFORE ENCROACHMENT. 'LINE CO If THE FLOOD ELEVATION AFTER ENCROACHMENT. 'SURCHARGE If NOT TO EXCEED to FOOT (PIA 11111QUIREMENTI OR LEI1iE111 AMOUNT IF EFECIFIEO •Y STATE. SOURCE: FLOOD INSURANCE ADMINISTRATION 1 U.S. DEPARTMENT OF MOUSING AND URBAN DSVIELOPMENT FLOODWAY SCHEMATIC. FIGURE 4 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR INDEX OF FLOOD INSURANCE RATE MAPS LEGEND PROJECT ALIGNMENT )memo l*=*# 1 FIGURE 5 I t y I I y1 I 0 1 r ii. - Ix !�Ucr '_ Y,•• I o W � p E _CQW O a. 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( 1 1f W l / ! i��l 1�I �1� it � ;�� ■��a�,t �� ��t� 1 i ui�u 11 i l; i' �� ��• j :!i i; ''. !! 11tt */ - '�i 1 10 D 1 1R r O ij ••:i' I z n a. AV UJ y � W (r' Q W IWO _ _ W C y�e LU <�Q �C t • it ��, ;' ; ;1 �f�i! ` ` �� � � liftI �� • � .�� � i;i �� a Eli I I ! 1 ! I 1 I I ( tl ! i ti 1t ® so D i ! i ;, I3E 1 u v1 !11 Hill,, 1 . cc z O mw zx CL LL 0 Q i i 1 i 1 I 1 I I I 1 t I 1 \�� M I � t 4 as n►N �' , ► J < 0 Z N N O r- I M W I Z = 8 t c� �d, W O � t S r c lu O X F�yry of 2 C V a ' 1n 0 °I .: is � w Q Y NK s ZAO `fir >, t►F. r « + o � o �,► i E,\' M s01Y � 5 o � x f rr s z <,u i G I., Z ZE 2 so v096 � iE o <jc 1 �g oc.< ZtiI tl 3i�li +. = lip OV.. • � tit � 1 i � 1;I ;l,l ;1 ;1 � t ! I � I � , � �_ �� � !• i , t t !� � W 17 crossings will be above the 100-year flood elevation. Therefore, the roadway will not be flooded, but the roadway embankment may encroach on the floodplain on some of these drainage crossings. For purposes of this report, the term encroachment shall mean an action within the limits of the base floodplain. Tables 2 and 3 contain a list of all floodplains traversed by the project alignment. These tables distinguish between longitudinal 1 encroachment on the floodplain and "significant encroachment". The latter is defined to mean a highway encroachment and any direct support of likely base floodplain development that would involve one or more of the following construction or flood related impacts: (1) A significant potential for interruption or termination of a transportation facility which is needed for emergency vehicles or provides a community's only evacuation route. (2) A significant risk, or (3) A significant adverse impact on natural and beneficial floodplain values. Support base floodplain development shall mean to encourage, allow, serve, or otherwise facilitate additional base floodplain development. Direct support results from an encroachment, while indirect support results from an action out of the base floodplain. The following paragraphs describe the effect of the project's significant encroachments on the Bonita Channel, Coyote Canyon, and Oso Creek floodplains. Bonita channel The portion of Bonita Channel downstream of the confluence with Coyote Canyon Creek is parallel to the Corridor. This channel will be realigned as part of Pelican Hill Road project. Later this road will be replaced by the SJHTC. The Corridor embankment will encroach on the floodplain and in some areas on the main channel itself. In order to safely convey the flow in this facility, it will be necessary to realign and redesign this channel to carry the entire flow. Since this results in adverse impact on the natural floodplain, then according to the definition given above, it is considered to be a significant encroachment. Exact quantitative analysis of the project encroachment on the flow was not made for this study since the design of the corridor has not been finalized. Therefore, the nature of the assessment of the impact on the floodplain is purely qualitative. Detailed hydraulic calculations for the flow in the vicinity of the encroachment will be performed at the time of the final design. The future flood control facility will be designed to also serve as a wetland site to mitigate any losses in wetland habitats resulting from the project. The portion of the Bonita Canyon Road within the Corridor right-of-way will be constructed as part of this project. The new alignment of the road will encroach the floodplain of Bonita 1 Code of Federal Regulations, the Office of Federal Register, April 1988. SCOR0130.OHAmec 18 Revised 4-9-90 I Channel upstream of the confluence with Coyote Canyon Creek. As ` a result, this reach of Bonita Channel will have to be improved and/or realigned. Table 2 contains additional information on the impact of the project on this floodplain. Coyote Canyon Creek Coyote Canyon Creek will be realigned as part of Pelican Hill Road project. The proposed alignment of the creek will extend. from the site of the future Pelican Hill Road interchange, to the Ford/Bonita interchange and will be parallel to the alignment of the SJHTC. The floodplain of Coyote Canyon will, therefore, be significantly impacted with or without the SJHTC project. As mentioned earlier, the proposed realignment of the creek ends just upstream from the Ford/Bonita interchange. This interchange will significantly impact the natural floodplain just downstream from the realigned portion of the creek. This encroachment will be due to the embankments of the ramps and connector roads. The floodplain area contains wetland habitat which is considered to have natural and beneficial values.. Therefore, this encroachment is considered significant. The reach of the creek across this interchange will be improved and realigned up to Bonita Reservoir, downstream of Ford Road. See Table 2 for additional information on the project impact on this floodplain. The assessment of the impact on the floodplain is only qualitative. Detailed quantitative analysis will be performed during final design. The proposed alignment of Coyote Canyon Creek for Pelican Hill Road will be from 50 to 200 feet away from the edge of pavement of the SJHTC. Therefore, in addition to the encroachment into the natural floodplain, portions of the realigned creek will also be within the embankment fill of the Corridor; specifically, these are reaches along the Pelican Hill Road and Ford Road ramps. For the Corridor, these portions of the creek will have to be covered in order to accommodate the embankment. (See Section 5.4 for alternatives). However, the encroachment into the realigned portion of the creek is not considered to be significant (see criteria for significant floodplain encroachment in Section 5.0). Oso Creek Under the Conventional Concept alternative for the project,, the proposed Corridor- will cross Oso Creek near the upstream end of the channelized section of the facility. The unimproved portion of the creek meanders between the Corridor and I-5. The,S'JHTC embankment encroaches on the floodplain of this reach. The existing channel may have to be realigned and extended upstream approximately 1800 feet parallel to the Atchison Topeka -Santa Fe Railway and Camino Capistrano. The resulting impact on the natural floodplain will constitute a significant encroachment. Table 2 shows more information for the project impact on the floodplain for various alternatives. This is based solely on a SCOR0130.OHAmec 19 Revised 7-17-90 I qualitative assessment of the data. Detailed quantitative analysis of the flow and any encroachment will be performed during the final design phase. Under the Demand Management Concept, p , the S JHTC will join I-5 in the vicinity of the Avery Parkway interchange. Under this option, the Corridor will be on a 2800 ft. long viaduct bridge and will encroach into the floodplain of Oso Creek only if the bridge piers are constructed within the floodplain boundary. This option proposes that the grade of I-5 be lowered to accommodate a reconstructed Avery Parkway over I-5. Approximately 7000 ft. of I-5 will be relocated both horizontally and vertically. The ultimate grade on I-5 will be about 18 feet below the 100-year water surface elevation at the sag point of the highway. The 100-year water surface elevation in this reach of the creek varies from about 236 ft. to 247 ft. above MSL. However, this depressed section of I-5 will be protected against flooding by an existing levee along the floodplain. The top of the levee is approximately 2 ft. higher than the 100-year water surface profile in the creek. A future retaining wall along the _ SJHTC will be located beyond this levee and will provide supplemental protection against flooding from Oso Creek. �Al 1 Fj F 1 SCOR0130.OHAmec 20 Revised 7-17-90 III I r y 1 1 1 1 r i 1 1 r TABLE 2 SUMMARY OF FLOODPLAIN CROSSINGS Proposed Project Alternatives Location Work San Diego Creek University Dr New 1 Conventional 2 Demand Management 3 No Build Bonita Channel Bonita Cyn Rd 1 Conventional 2 Demand Management 3 No Build Coyote Canyon Creek Coyote Cyn Rd 1 Conventional 2 Demand Management 3 No Build Laguna Canyon Channel Laguna Cyn Rd 1 Conventional 2 Demand Management 3 No Build New New New Significant Encroachment No No No Yes Yes Yes Yes Yes Yes No No No E1 Toro (Niguel) Creek E1 Toro Rd Existing 1 Conventional No 2 Demand Management No 3 No Build No Aliso Creek Alicia Parkway New 1 Conventional No 2 Demand Management No 3 No Build No Narco Channel LaPaz Drive Existing (North Sulphur Creek) 1 Conventional No 2 Demand Management No 3 No Build No Oso Creek I-5 New 1 Conventional Yes 2 Demand Management No 3 No Build No Trabuco Creek I-5 Sta.616+00 Existing 1 Conventional No 2 Demand Management No 3 No Build No Horno Creek I-5 Sta.534+00 Existing 1 Conventional No 2 Demand Management No 3 No Build No SCOR0130.0HAmec 21 Revised 7-17-90 ro �•rl H 0 rq zzz Q) N 414) W� Q)N44 zzz zzz zzz O O 0 � V. �'�'�' �'�� zzz x� 93 �ipq aaib 000 zzz 000 zzz 000 zzz 000 zzz 000 zzz 000 zzz 000 zzz a� ro o a U W N M z a O O O zzz O O O zzz O O O zzz O O O zzz O O O zzz O O O zzz O O O zzz H W paq r-4 4J G E4 0� H ra ,Cq �+ W 4 � Z z N N N ) Q) N N N ��� O O O zzz O O O zzz O O O zzz 0 0 0 O •r'I 0 tT H >+ >°1j U � p�p a W O� Iv 4J a ar roo aril 000 zzz 000 zzz 000 zzz 000 zzz 000 zzz 000 zzz u 0 0 0 zzz U > 0 H � > a a O a �+ a� Iv Q) ar ro a ar U a ar a W 0 a 0 $ U O 4 U s O H O 0 W z 0 Iv O Ivroro H br arroro r--I ZT aroro r-I tT aroro r-1 M O r I IT roro H m r-I m as �4 aaa aoro oa oa~ to �roro a~r O z go •4j co • oro •0 oz a oaros z b ae0aros W •rZ V aUoro oro •raI Za PO r-1 a b •rr rl U V H a b •r♦ ro41 U r♦ a to •4 to U V rf a V •ri 4j r-I a b •ri Iv k 4J r+ a V •ri CO V ri a V •rI 41 0 aralaa •ri> Alm ro ara0 > roas 0> Oa0 rooa ro a►aa > rom 00)00 > oas U0a0 > roas Ura Glaa o •n a� 000 �a0 •raOCIO +�a� 0000 aas 000 oars oara 0aa > rom O r.UOz gUGz UOz 000 UGz N000 UQz U000 kUOz �+ flit-INM H OUOz U NM HNM 4 H to riNM a �O 4-3 a� ro N 8 N a v M A (0 C 42Iv o •ON w w y � 4a as 0> a c H zz°z zzz zzz z°z°z° zz°z° zz°z° z°zz z°z°z° z°zz 4)zz ZZ-Z zzz z°z°z zZz ZZ.Z Wr-I Gl ON ON U�zri W z'�U 41 d R 'is •� Q to •••I p G 'C7 •rI GJNI~O 04)I~0 UCIq� M>rom U>rom �rooD U O d A O W 0 0 9 O 4) 0 2UGZ NUGz 0 e-I N M E-I 1-I N M DUQz '�L,' r-I N M 5.1 Caltrans Guidelines Supplementing Executive Order 11988, Floodplain Management 5.1.1 Risks Associated with Implementation of the Action No risks are involved at any floodplain location with the Build Alternative. The amount of fill placed in any stream for either of the Build alternatives would produce an insignificant rise in the 100-year flood elevations, and these would be well within the Federal Emergency Management Agency (FEMA) guidelines. Cross drainage structures will be constructed such that there will be no potential for upstream or downstream property damage and the Corridor will not be flooded. 5.1.2 Impacts on Natural and Beneficial Floodplain Values The Build Alternative would require fill for the Corridor within Bonita channel floodplain. The Channel would also have to be realigned. However, with No Build Alternative, this floodplain would still be significantly affected by Construction of Pelican Hill Road. Prior to building Pelican Hill Road, the Channel will be realigned by the Irvine Company. With the Build Alternative for the Corridor, this road will be widened and replaced by the SJHTC. Bonita Channel will be realigned again and built per Caltrans and local agency standards. Detailed hydraulic' calculations are required to assess the impact on floodplains. 5.1.3 Support of Probable Incompatible Floodplain Development Tsupport incompatible development pp . All The project would not su development within the floodplain zone must be capable of withstanding inundation by floodwaters and not cause flooding damage to adjacent properties. 5.1.4 Measures to Minimize Floodplain Impacts Associated with the Action - Measures to restore and preserve the natural and beneficial floodplain values impacted by the action. Mitigation for wetlands impacts will restore natural and beneficial values caused by the action. Environmentally sensitive areas will be established to prevent damage outside work areas. Construction methods will be selected to minimize impacts. I 1 1, SCOR0130.OHAmec 24 Revised 7-17-90 5.2 Increased Runoff to Majo r Drainage Crossings from Corridor Roadway Surface Roadway drainage from the Corridor surface will be discharged into several major drainage crossings.: San Diego Creek, Bonita Channel, Coyote Canyon, Laguna Canyon, E1 Toro Creek, Narco Channel, Aliso Creek, Oso Creek, Trabuco Creek, and Horno Creek. For post project conditions, the Corridor surface will be paved. This may cause an increase in the total runoff from the site. The amount of increase in channels with very large tributary areas will be insignificant. However, for those watersheds with smaller drainage basins, the amount of increase in runoff from the Corridor site may have a pronounced effect on.the design discharge in the channel. Specifically, the following drainage. channels may receive more flow as a result -of the Corridor construction: Bonita Cha nnel Laguna Canyon Channel Niguel Creek (ElToro Creek) Narco Channel -(North Sulphur Creek) The amount of increase in peak flow is estimated to be no more than 5%. A complete study of on -site drainage of the Corridor will determine the exact amount of flow which will be conveyed to these channels from the roadway surface. Measures to mitigate the increase in runoff will include retarding basins and will be further refined as part of final design. 5.3 Park and Ride Facilities Park and ride lots will be provided to serve bus -riders, van pools and carpools. The lots will be located at the following locations: Crown Valley Parkway Alicia Parkway Laguna Hills Road El Toro Road Ford Road Crown Valley Parkway - This lot -will be approximately three acres; in area. The facility -will be located along Greenfield Drive, north of Crown Valley Parkway. The nearest major watercourse to this lot will be Oso Creek and -the lot will be well outside'the floodplain of the creek. This lot will not impact any existing floodplains. Alicia Parkway - This lot will be approx-imately three acres in size. It will be located on Alicia Parkway on the south side of the Corridor and adjacent to Aliso Creek. The limits of this lot will be outside the natural floodplain of Aliso Creek. However, a retarding basin is planned along Aliso Creek, downstream of the Corridor as part of the Aliso Viejo.Planned Community drainage improvements. This basin is being constructed by a private developer in order to mitigate the peak runoff from the planned community and is independent of the Corridor. Construction of this facility has already been approved by the.County. Flow in SCOR0130.OHAmec 25 Revised 7-17-90 Aliso Creek will pond up behind the basin embankment. Consequently, the backwater effect from the basin will increase the water level upstream at the Corridor by approximately 5 feet. This increase in the depth of flow is within FEMA guidelines since it does not endanger lives or property. However, as a result of this increase, the floodplain will be larger and will encroach upon the proposed site of the park and ride. Therefore, the lot will have to be built above the maximum 100-year water surface elevation in the creek with the retarding basin in place. The lot encroachment in the floodplain will not cause an objectionable increase in the backwater. Laguna Hills Drive - This lot will be approximately one acre in size. It will be located on Laguna Hills Drive along the south side of the Corridor. The lot will be well outside any existing floodplains. E1 Toro Road - This lot will be approximately two acres in size. It will be located along the west side of E1 Toro Road and directly south of the Corridor. The closest major water course to this lot will be Niguel Creek. The lot will be outside the natural floodplain of the creek. Moreover, existing flood control improvements have relieved the floodplain along the creek. Ford Road - The area of this lot may be up to one acre. It will be located along the north side of the Corridor and directly adjacent to Bonita Canyon Drive. The closest major watercourse to this location is Bonita Channel, located between the road and the lot. The 100-year floodplain of the channel is about 160 feet wide which would cover the north side of the area allocated to this lot. However, approximately ten acres have been set aside for this lot. Since this far exceeds the size required for the lot, the ultimate location of the park and ride facility will be such that it will not encroach on the floodplain. 5.4 Alternatives to Avoid Encroachment The proposed alignment for both Build Alternatives follow the alignment adopted by the orange County Board of Supervisors on November 28, 1978. The alignments and the design alternatives are the results of a public participation program and are dictated by a number of socioeconomic and environmental factors. The three significant longitudinal encroachments along the project are on the floodplains of Bonita Channel, Coyote Canyon Creek, and Oso Creek. Encroachment into Bonita Channel and Coyote Canyon Creek floodplains would occur even under the No Build Alternative due to construction of Pelican Hill Road. In order to prevent encroachment on these floodplains, the alignment of the Corridor would have to be shifted to the north in which case it would significantly encroach on the UCI campus. Alignment alternatives to the south are not viable because they would be much closer to existing development. Furthermore, any alignment shifts to the south would encroach on the Coyote Canyon landfill site and Bonita Reservoir which provides a wetland area. Under the No Build Alternative there would be no encroachment into the Oso Creek floodplain. 1 11 1 r 1 1 J 11 11 I P I SCOR0130.OHAmec 26 Revised 7-17-90 I I a 6. PROPOSED CROSS DRAINAGE STRUCTURES The drainage from the tributary basins will be accomplished by constructing appropriate cross drainage structures, including pipe drains, culverts, or bridges to pass the 100-year flood computed for the respective areas or the largest flood of record, whichever is greater. The type of cross drainage`structure will depend upon the topography, design discharge, geotechnical and hydrologic features, structural and cost considerations. The data used in these designs will be based on the most up-to-date hydrological information available from recent studies. The stream modifications and improvements completed already and those proposed in the future will be considered in these designs. Potential hydrological impacts, such as erosion and sedimentation shall be mitigated by incorporating appropriate energy dissipating structures, sedimentation basins,,_riprap, etc. In addition, special attention will be given to environmentally sensitive areas, such as wetlands. The cross drainage structures proposed at these locations will be designed so that there will be minimal impact on the wetlands. Conceptual plans for the Corridor show the locations and sizes of all cross drainage structures along the project. The -sizes were determined based on preliminary hydrologic and hydraulic calculations. Table 3 presents a summary.of the preliminary cross drainage structures proposed for major stream crossings along the Corridor. All stream crossings will comply with,-FIA's and -Orange County EMA's guidelines for encroachment on floodplains. Table 4 compares the Peak 100-year flows and greatest floods of record for these stream crossings. SCOR0130.OHAmec 27 Revised 7-17-90 TABLE 4 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR SUMMARY OF MAJOR STREAM CROSSINGS ------------------------------------------ Stream Proposed Drainage 100-yr Size Len gth Type Area Flood (ft) (ft) Crossing (Acres) (CFS) ____________________ ------------------------------------ San Diego Creek Bonita Creek Laguna Canyon Creek Niguel Creek* Aliso Creek Narco Channel* Oso Creek Trabuco Channel* Horno Creek* Bridge 76,670 41,600 -- 1,110 Double Box 957 2,368 11x6 1,200 Bridge 1,770 2,050 -- 11210 Single Box 735 1,374 9.0x8.5 160 Bridge 9,840 7,300 -- 380 R.C.Pipe 704 2,120 8.5 11280 Bridge 91480 10,200/ -- 3,560 6,300** Bridge 23,000 18,500 -- 240 Double Box 2,840 30,200 8x8 190 * Existing structure ** A/B: "A" represents normal 100-year Peak Flow "B" represents attenuated Peak Flow resulting from upstream retarding basin. SCOR0130.0HAmec 28 Revised 7-17-90 i 1 1 I i 1 1 1 1 1 1 1 t 1 1 1 1 Table 5 Peak 100-year Flows and Greatest Floods of, Record Major Stream Crossings along the SJHTC Greatest Flood Q100 of Record Creek CFS Location (CFS). Location San Diego 41,600 Jamboree Rd. 15,500 Campus Dr. Coyote Canyon 2,638 Bonita Canyon --- --- Road Bonita Channel 2,368 SJHTC --- --- Laguna Canyon 2,050 SJHTC 1,400 Woodland Dr. (d/s SJHTC) Niguel 1,374. SJHTC --- --- (E1 Toro) Aliso 7,300 SJHTC 5,000 U/S Sulphur Creek (d/s SJHTC) Narco 2,120 SJHTC --- --- (North Sulphur)* Oso 6,300 SJHTC 50,000 Crown Valley Parkway Trabuco 18,500 I-5 9,240 I-5 Horno 3,200 I-5 --- --- Source: Letter from OCEMA dated March 14, 1990'. SCOR0130.OHAmec 29 Revised 7-17-90 i 1 1 1 1 1 1 1 A 1 1 1 1 1 1 1 1 i 1 TECHNICAL MEMORANDUM TM 3-16 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR CONCEPTUAL DRAINAGE STUDY JULY 1990 Prepared by: Shahab Nazarie/C.T. Bathala CDMG Actions: Project Manager: Manager of Engineering: Project Director: SCOR0111.OHA Da e 70 1,14A 'Date Zd/� Dto r I SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR CONCEPTUAL, DRAINAGE STUDY TABLE OF CONTENTS PAGE EXECUTIVE SUMMARY & CONCLUSIONS .......................iv 1. INTRODUCTION .................................... 1 1.1 General ..*... . . . . . . . . . . . . . . . . . . . . . .. . . . . . 1 1.2 . Study Objectives .................. ...... . .. 1 2. HYDROLOGY ....................... .;................ 4 2.1 Hydrologic Setting..... ...................... 4 2.1.1 Topography .......................... 4 2.1.2 Rainfall and Runoff .................. 4 2.1.3 Soils ................................ 6 2.1.4 Soil Cover and Land Use .............. 7 2.2 Hydrologic Analysis ......................... 7 2.2.1 General .............................. 7 2.2.2 Assumptions ......................... 9 2.2.3 Design Criteria ....................... 9 2.2.4 Computational Procedures.. ........10 2.2.5 Results ........ :..................... .10 3. MAJOR WATERSHEDS ................ ........:........ .14 3.1 3.2 General.....................................14, San Diego Creek Basin.:.....................14 3.2.1 Bonita Channel............ .........1G 3.2.2 Coyote Canyon Channel................19 3.3 Bommer Canyon........................:.....22 3.4 Laguna Canyon Channel .......................2'2 3.4.1 E1 Toro (Niguel) Cre-ek...........-....28 3.5, Aliso Creek Basin.... ..:..::................32 3.5.1 Narco (North Sulphur Creek)..........36 i SCORO111.OHA TABLE OF CONTENTS (continued) PAGE 3.6 San Juan Creek Basin...............................36 3.6.1 Oso Creek...................................36 3.6.2 Trabuco Creek...............................41 3.6.3 Horno Creek.................................41 4. BRIDGE CROSSINGS........................................44 4.1 Basic Information..................................44 4.2 Bridge Design Criteria .............................44 4.3 Summary of Conceptual Bridge Crossings.............44 5. CULVERT CROSSINGS.......................0...............49 5.1 General............................................49 5.2 Methodology........................................51 5.3 Summary of Conceptual Culvert Crossings .... ........ 51 6. SUMMARY ............................... .... ....... ....... 52 REFERENCES.............................................0....53 LIST OF FIGURES 1. Study Area Location Maps ................................ 2 2. Typical Corridor Section ................................ 3 3. Major Watersheds, Watercourses, and Floodplain areas in the vicinity of the Corridor .................. 5 4. San Diego Creek Basin...................................15 5. Bonita Channel - Reach I................................17 6. Bonita Channel - Reach II...............................20 7. Average Monthly Runoff Volume into Bonita Reservoir ..... 21 8. Bommer Canyon, Moro Canyon, Muddy Canyon Watersheds ..... 23 9. Laguna Canyon Basin.....................................24 10. Corridor Bridge over Laguna Canyon......................26 11. Laguna Canyon Channel Crossing ..........................27 12. Proposed Retarding Basin at the Laguna Canyon Road Interchange.............................................29 13. E1 Toro (Niguel) Creek Crossing .........................31 14. Aliso Creek Basin .......................................33 ii SCOR0111.0HA i T LE OF CONTENTS continued PA E 15. Profile for Aliso Creek from the Corridor to the Pacific Park Retarding Basin ............................34 16. Construction Schedule for the Corridor and the Pacific Park Retarding Basin.............................35 17. North Sulphur Creek (Narco Channel) Crossings ........... 37 18. San Juan Creek Basin....................................38 19. Oso Creek Crossing......................................40 20. Proposed I-5 Grade in Relation to Oso Creek.............42 21. San Diego Creek Bridge...................................46 22. Laguna Canyon Bridge....................................47 23. Culvert Crossings.......................................50 ILIST OF TABLES 1. Major Drainage Facilities across the San Joaquin Hills Transportation Corridor... ............................... 8 2. Peak 100-year Flows and the Greatest Floods of Record for Major Stream Crossings along the SJHTC..............11 3. Hydraulic Data for Bridges over Major Streams Crossing the San Joaquin Hills. Transportation Corridor ........... 12 4. San Joaquin Hills Transportation Corridor Culvert Information.............................................13 1 ISCOR0111.OHA r! E 1 EXECUTIVE SUMMARY The proposed San Joaquin Hills Transportation Corridor (SJHTC) will be the extension of Corona Del Mar Freeway (SR-73) from John Wayne Airport area to San Juan Capistrano. It will be between and parallel to the San Diego Freeway (I-5) and Pacific Coast Highway. The corridor will join the I-5 'Freeway in 'San Juan Capistrano. The limits, of the project are from Jamboree Road in Newport Beach to Ortega Highway at I-5. The project consists of new construction from Jamboree Road to the I-5 Freeway near Paseo De Colinas and widening of I-5 Freeway from this point to the Ortega Highway. This report presents the study objectives, assumptions, design criteria, methodology and the findings of the conceptual level drainage analyses performed for various streams, creeks, ditches and canyons crossing the SJHTC alignment. The hydrologic analyses were performed using the Rational and Synthetic Unit Hydrograph methods (Orange County Hydrology Manual) to obtain the 100-year peak discharge for future drainage crossing structures. These values exceeded the magnitude of the greatest flood of record at all the crossings. The structure type selection was based on Caltrans District 7 Hydraulic Design Manual. The proposed structures are classified into three categories: pipe culverts, box culverts and bridge crossings. The proposed SJHTC crosses nine major streams. The majority of these crossings will be bridges. The portion of I-5 Freeway included in this project crosses two major streams: Trabuco Creek and Horno Creek. Existing bridges over these, streams will be widened. CONCLUSIONS The- following conclusions are presented based on the study performed and reported in this document: o There are nine major stream crossings that will be encountered along the project alignment. o The proposed alignment of the corridor encroaches on the existing 100-year flood plain of Bonita Channel, Coyote Creek and Oso Creek. Therefore, these existing natural channels will have to be realigned. o There are approximately 40 minor crossings which include both pipe culverts and box culverts. SCOR0111.OHA iv L o During the final design phase, all structures shall be designed in conformance with Caltrans and County standards, and in compliance with Federal Emergency Management Agency guidelines. o The results presented in this report are based on conceptual level analysis and are not to be construed as final. Final detailed analysis shall be performed by the section design engineers as part of the final design phases of the project. I 1 1 1 1 1 SCOR0111.OHA v LI 1-1 J 1 1. INTRODUCTION 1.1 General The proposed San Joaquin Hills Transportation Corridor (SJHTC), or State Route 73, will traverse the western portion of Orange County from Interstate Highway 405 in the City of Costa Mesa to Interstate 5 in the City of San Juan Capistrano. The project is an extension of the existing portion of- the SR-73 from the intersection of Jamboree Road in the City of Newport Beach to the I-5 Freeway. It will also entail widening the portion of I-5 from the junction of SJHTC to, the vicinity of Ortega Highway (SR-74). Figure 1 shows the regional and local settings of the project. The overall length of the Corridor is 19.4 miles; 14.5 miles of new location construction, 4.2 miles of widening on,Interstate 5, and 0.7 miles of widening on SR-73. It will pass through the Cities of Newport Beach, Irvine, Laguna Beach, Laguna Niguel, Mission Viejo and San Juan Capistrano, in addition- to unincorporated areas of Orange County. It is expected to have three to five lanes in each direction and a median (Figure 2) of sufficient width to be utilized in the future for High Occupancy Vehicles (HOV) or light rail. 1.2 Study Objectives The proposed project alignment will cross several large canyons and flood control channels. Additionally, there will be a large number of smaller drainage facilities. which will cross the corridor. The purpose of this report is to: o identify all drainage crossings along the corridor, o identify the design discharge for each drainage crossing, o provide information on flood control concerns associated with the major drainage basins, and o provide guidelines and directions for preliminary design of each crossing. SCORO111.OHA -1- 405 Er 73 jo-Ad- u% INEWPORr 13, BEACH BAN JUAN CAMRANO err -A LOCAL SETTING Freaways Corridor FIGURE 1 STUDY AREA LOCATION MAPS I 1 1 1 1 11 1 1 1 1 _3_ FIGURE 2 2. HYDROLOGY 2.1 Hydrologic Setting This chapter describes the general hydrologic setting of the Corridor and includes a discussion of the topographic features, geology, land use practices, soil characteristics, hydrology and groundwater conditions. 2.1.1 Topography The Corridor lies in the San Joaquin Hills and the Sheep Hills, which together extend from Newport Beach to San Juan Capistrano. The typical topography consists of rolling hillsides, a few steep ridges, narrow alluvial basins, and canyon bottoms. Major topographical relief ranges from 200 to 1,200 feet above mean sea level (MSL) throughout the Corridor's length. Large canyons, arroyos and ridges are oriented in a north -south direction, and major watersheds drain towards the Pacific ocean. Towards the interior portion of the Corridor's alignment, valleys and gently rolling hills are aligned in a northwest to southwest direction. 2.1.2 Rainfall and Runoff The project site has a Mediterranean type climate characterized by long, dry summers and mild winters. The average annual precipitation is 13 inches and increases to 18 inches in the higher elevations. The major portion of precipitation occurs during the period from November through March, with little or no rain from May through October. Three types of storms produce precipitation in the area: general winter storms, thunderstorms and tropical cyclones. Most past flooding has been caused by high intensity rainfall associated with general winter storms. Flood flow stages can rise from nearly dry streambeds to extreme flood peaks in a matter of hours. The project alignment crosses several major watersheds. Figure 3 shows the major watercourses crossing the corridor alignment. These are: San Diego Creek, Laguna Canyon Channel, E1 Toro Creek (Niguel Creek), Aliso Creek, Narco Channel (North Sulphur Creek), Oso Creek, Trabuco Creek Channel, and Horno Creek Channel. The San Diego Creek drainage basin begins in the San Joaquin Hills to the south and the Santiago Hills to the north. The main channel in this watershed flows westerly into the Tustin Plain and then flows southerly and eventually discharges into upper Newport Bay. The major tributary located within this watershed which crosses the Corridor is Bonita Channel. SCOR0111.OHA -4- 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 The tributary area of Laguna Canyon is made up of steep canyons with fairly impervious soil. The area at the present is mostly undeveloped. The main channel flows from north to south parallel to Laguna Canyon Road. At present, the valley below the future corridor site is subject to regular flooding. The existing channel adjacent to Route 133 is an earth ditch three feet deep and five feet wide overgrown with heavy brush and vegetation. The major tributary within this watershed which crosses the Corridor is the E1 Toro Creek Channel, also referred to as Niguel Creek. The Aliso Creek watershed begins at the southwest facing slopes of the Santa Ana Mountain range, in the Cleveland National Forest, and extends down into the urbanized portions of Laguna Hills. The basin is composed of steep upper canyons with no drainage improvements, covered with brush and trees, and moderate slopes in the lower canyons with extensive storm drain improvements and large residential and commercial land use elements. The major tributary within this watershed which crosses the Corridor is Narco Channel. Trabuco Creek crosses the existing San Diego Freeway (I-5) in the City of San Juan Capistrano. Although this channel does not cross the SJHTC, the portion of I-5 over the Trabuco Creek will be widened as part of the SJHTC Project. The major tributary of this channel crossing the Corridor is Oso Creek Channel. Horno Creek crosses the existing I-5 freeway approximately 2,000 feet north of Ortega Highway. The drainage basin for Horno Creek rises in the hills adjacent to Plano Trabuco. The main channel in the watershed flows southwesterly where it eventually joins San Juan Creek in the City of San Juan Capistrano. 2.1.3 Soils One of the major factors affecting infiltration is the type of soil. Based on the Soil Conservation Service criteria (Ref. 23), soils are classified into four hydrologic soil groups as follows: Soil group A Low runoff potential, consisting mainly of deep, well -drained sands or gravel. Soil group B Soils having moderate infiltration rates, consisting of moderately well drain sandy -loam soils with fine to moderate coarse textures. Soil group C Soils having slow infiltration rates, consisting of silty -loam soils with moderate fine texture. 1 1 I I 1 1 1 1 SCOR0111.OHA -6- 1 1 Soil group D High runoff potential with slow infiltration. rates, consisting mainly of clay soils with a permanent high water table or shallow soils over impervious material. Surface soils in the Corridor area range from free and gravels to sandy loams, silty material and clays. According to the Soil Conservation Service in the northern half of the project are mostly made ' sandy loam which is in hydrologic soil group C and is in group D. The southern half is also represen loam along with Bosanko clay which is in group D. 11 I 1 I 1 I 1 1 I draining sands poor draining surface soils up of Cieneba Alo clay which ted by Cieneba The bedrock types found in the Corridor belong to the Silverado (T ), Sespe (Ts),.Vaqueros (Tv), Topanga (Ttb and Ttl), Diabase fotations, San Onofre Breccia (Tsoj, Monterey (Tm), Capistrano (Tc), and Niguel (Tn). 2.1.4 Soil Cover and Land Use Existing development in the Corridor area is clustered at the terminus near San Juan Capistrano, while most of the other areas along SJHTC are relatively undeveloped. The future land use adjacent to the Corridor is projected to include development ,of single and multi -family residences, business complexes, and shopping centers. Agriculture, a historically predominant land use practice is rapidly declining, and is being replaced by the growing urban development. 2.2 Hydrologic Analysis 2.2.1 General The project expanse covers a wide range of terrain and land use areas. Approximately 50 large and small streams cross the proposed alignment of the corridor. In order- to identify major drainage facilities systematically, the Orange County Environmental Management Agency (OCEMA) has assigned an alphanumeric designation to each facility based on its geographic location. For example, numbers for all drainage facilities in Irvine and Newport Beach begin with the letter F; e.g., San Diego Creek (F05) or Bonita Channel (F04). Table 1 contains a list of all major drainage facilities crossing the SJHTC,- along with their designated numbers. Hydrologic analyses for major watersheds along the Corridor have been performed previously as part of land development projects. OCEMA has reviewed and approved most of these studies. L SCOR0111.OHA -7- Table 1 Major Drainage Facilities Across the San Joaquin Hills Transportation Corridor Creek San Diego Creek Coyote Canyon Bonita Channel Laguna Canyon Channel Niguel (El Toro) Aliso Narco (North Sulphur) Oso Trabuco Horno Facility No. F05 F04PO4 F04 IO2 IO2S01 JO1 J04 L03 L02 L05 SCOR0111.OHA -8- I n 1 2.2.2 Assumptions Several. assumptions have been made to perform the required calculations for this study. Following is a summary of these assumptions: 1. The hydrologic analyses for all drainage basins were performed based on ultimate development. Information on the type of ultimate development was obtained from ' zoning maps available for the.area. 2. The rainfall intensities and soil type used in the ' calculations were based on the 1986 edition of the Orange County Hydrology Manual (Reference 16). 3. Peak 100-year discharges for major watersheds were extracted from hydrology reports approved by the-OCEMA. 2.2.3 Design Criteria The drainage criteria used for performing the required hydrologic and hydraulic calculations are presented in the Project Manual, Volume III - Design Guidelines. (Reference 25). Most of these criteria were extracted from the Caltrans Highway Design Manual - and the Orange County Hydrology Manual. Following is a summary of the pertinent criteria: o All off -site drainage facilities, shall be designed based on the 100-year peak discharge or the greatest flood of record, whichever is higher. o When the drainage area is less than 640 acres., the Rational Method shall be used to calculate the peak discharge. o For drainage areas -greater- than 640 acres., the Unit Hydrograph Method based on the Orange County Hydrology Manual shall be used. o Floodplain encroachments .shall conform to the guidelines established by the Federal Emergency Management Agency. o Cross culvert under the roadway and pipe runs exceeding 200 feet between inlet and outlet or intermediate cleanout access shall have a minimum diameter of 24 inches. I ISCOR0111.OHA -9- 2.2.4 Computational Procedure The following procedure was used for performing the conceptual hydrologic analysis: o Superimpose the San Joaquin Hills Transportation Corridor (SJHTC) alignment on the 200-scale topographic maps. o Identify drainage paths crossing the Corridor, delineate drainage boundaries and determine drainage areas. o Apply the Rational Method to obtain the 100-year and 10-year discharges for each drainage area less than 640 acres. o Apply the Unit Hydrograph Method for drainage areas larger than 640 acres. o The peak 100-year discharges and the greatest flood of record for several major streams at the crossing of SJHTC were provided by the OCEMA. Table 2 presents a list of these major streams and the corresponding peak 100-year discharges and greatest floods of record. 2.2.5 Results Following is a summary of the results obtained from the hydrologic analysis: o A list of bridge crossings along with the corresponding design discharges and hydraulic data is shown in Table 3. o A summary of culvert crossing locations, sizes, and design discharges is presented in Table 4. o The locations of all drainage crossings for the project are shown on Figure 23. Tributary areas and 100-year peak discharges are included. SCOR0111.OHA -10- Table 2 Peak 100-year Flows and Greatest Floods of Record for Major Stream Crossings Along the SJHTC Greatest Flood Q100 of Record Creek (CFS) Location (CFS) Location San Diego 41,600 Jamboree Rd. 15,500 Campus Dr. Coyote Canyon 2,601 Bonita Canyon --- --- Road Bonita Channel 2,200 SJHTC --- Laguna Canyon 2,050 SJHTC 1,400 Woodland Dr. (d/s SJHTC) Niguel 1,374 SJHTC --- (El Toro) Aliso 7,300 SJHTC 5,000 U/S Sulphur Creek (d/s SJHTC) Narco --- --- --- --- (North Sulphur) * Oso 6,300 SJHTC 5,000 Crown Valley Parkway Trabuco 18,500 I-5 9,240 I-5 Horno 3,200 I-5 --- --- Source: Letter from OCEMA dated March 14, 1990. * New calculations needed by Unit Hydrograph Method. SCOR0111.OHA -111- Table 3 Hydraulic Data for Bridges Over Major Streams Crossing the San Joaquin Hills Transportation Corridor 100-Year 100-Year Peak Flow W.S.E1. Velocity Watershed (CFS) (Ft.MSL) (FPS) San Diego Creek Channel 41,600 18.5 8.3 Laguna Canyon Channel 2,050 294.00 4.20 Aliso Creek Channel 7,300 215.19 4.12 Oso Creek Channel 6,300 231.07 23.15 Trabuco Creek Channel 18,500 --- --- Horno Creek Channel 31100 143.00 --- NOTE: These values are approximate numbers extracted from previous reports. Further detailed analysis may be required to arrive at more accurate results at some of these crossings. SCOR0111.OHA -12- TABLE 4 1 r 1 1 I k 1 L 1 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR CULVERT INFORMATION ISTATION . NEAREST INTERCHANGE APP. DIST. TO THE I/C (t) DRAINAGE AREA, ** (acres) 10-YR 100-YR Q Q (cfs) (cfs) CULVERT SIZE, *** (inches) 50750 GREENFIELD DR 1'150 10.9 19 34 30 54950 GREENFIELD DR 3050 5.9 12 21 24 78200 LAGUNA CYN RD 400 8.9 28 50 36 78500 LAGUNA CYN RD 100 136.5 332 589 90 78800 LAGUNA CYN RD 200 12.4 25 45 36 79500 LAGUNA CYN RD 900 6.1 13 23 24 80150 LAGUNA CYN RD 1550 16.5 35 62 36 80600 LAGUNA CYN RD 2000 4.8 10 18 24 81200 LAGUNA CYN RD 2600 13.2 30 53 36 82200 LAGUNA CYN RD 3600 14.6 37 67 42 83100 LAGUNA CYN RD 4500 7.0 16 29 27 83400 LAGUNA CYN RD 4800 10.3 30 54 36 85700 SAND CYN AVE 6800 1.8 5 8 24 86500 SAND CYN AVE MW 1.8 4 8 24 87400 SAND CYN AVE 5100 1.2 2 4 24 87850 SAND CYN AVE 4650 6.4 12* 21 24 90450 SAND CYN AVE 2050` 6.5 15 ' 26 27 92550 SAND CYN AVE 50 2.1 6 10 24 93250 SAND CYN AVE 756 18.9 47 85 42 93650 SAND CYN AVE 1150 4.9 14 24 27 94050 SAND CYN AVE 1550 5.8 10 18 24 95450 SAND CYN AVE 2950 3.1 7 12 24 95500 SAND CYN AVE 3000 2.8 5 9 24 95850 SAND CYN AVE mm 1.8 4 6 24 97050 SAND CYN AVE 45M 32.3 53 95 42 99550 PELICAN HILL RD 3550 111.3 189 337 72 108100 FORD/BONITA RD 0 11.1 19 34 30 108800 FORD/BONITA RD 700 4.6' 10 18 24 109250 FORD/BONITA RD 1150 11.1 26 46 36 109800 FORD/BONITA RD. 1700 6.0 13 23 24 112000 BISON AVE 1400- 49.5 64 116 48 112550 BISON AVE 850 8.2 10 !8 24 112950 BISON AVE 450 4.5 8 14 24 113950 BISON• AVE 550 17.2 25 44 36 114550 MACARTHUR BLVD 750 4.8 9 17 24 115050 MACARTHUR BLVD 250 2.1 4 8 24 115300 MACARTHUR BLVD 0 6.2 11 19 24 115500 MACARTHUR BLVD 200 3.9 9 17 , 24 115900 MACARTHUR BLVD 600 4.2 9 15 24 117150 MACARTHUR BLVD 1850 18.2 26 47 36 117900 MACARTHUR BLVD 2600 19 7 12 24 * Stations shown are approximate. They shall be established per the section engineer's plans. (Station based on CDMG plans dated Sep. 1989) ** Drainage area is measured at the roadway. *** Culvert sizes are only approximate. -Z3- 1 3. MAJOR WATERSHEDS 3.1 General The SJHTC project alignment crosses four major basins ' 7 These are the San Diego Creek, Laguna Canyon Channel, Aliso Creek and San Juan Creek basins. A total of 9 major tributary streams within these basins cross the project alignment. These tributaries are shown in Figure 3. This section presents a brief description of the watersheds and proposed drainage structures to accommodate the flows at the Corridor. 3.2 San Diego Creek Basin I The San Diego Creek drainage basin begins in the San Joaquin Hills to the south and the Santiago Hills to the north. The main channel in this watershed flows westerly into the Tustin Plain and then flows southerly and eventually discharges into upper Newport Bay. The average watershed slope is in excess of 10 percent in the upper hilly regions and gradually flattens to less than 1 percent through the central portion of the basin. ' The SJHTC crosses San Diego Creek immediately downstream from MacArthur Boulevard and upstream from the confluence with Bonita Channel. This crossing is located at the MacArthur Interchange. The drainage area of San Diego Creek at SJHTC crossing is approximately 115 square miles. A large number of regional flood control channels such as Serrano Creek, Peters Canyon Channel and Bonita Channel discharge into this facility. Figure 4 ' shows San Diego Creek and its tributaries in the vicinity of SJHTC. Although under existing conditions the land use elements within this watershed are made up of urban, agricultural, and open space, ultimately a major portion of the existing agricultural ' land will be converted to residential area (Reference 10). According to the hydrologic analysis presented in Reference 1 the peak 100-year discharge in San Diego Creek at the SJHTC has been estimated to be 41,600 cfs. ' This flow is based on ultimate development conditions in the watershed. The hydraulic analysis presented in Reference 10 indicates that there be "slight will a overbank flow" from the reach immediately upstream of the corridor during a 100-year flood. A more detailed hydraulic analysis of the effect of the Corridor on this reach should be carried out during the preliminary design phase of the project. Due to improvements in the San Diego Creek channel system, there has been an increase in the rate of sediment inflow to the upper Newport Bay. (Reference 10). In order to mitigate the adverse impacts caused by this influx of silt and debris into the bay, two sediment basins were constructed in the lower reach of the creek in 1982. One of , SCOR0111.OHA -14- I III I u I r� SAN 0 A. 10 CR K r , QA�D I W MESERV D CANYON `;; ',Milo St CALlF_QFtNlA�--"/ v-, ��u OhlTA BOMMER\ lcl�il %%a twft .. a/ .. CANYON Hil I a . C)NNYON 4w ow TA CANYON, RESERVOIR l�. aa• SAN is R90E f.OFM. SAAX -4MltwaY%_ A UMM N%Z SAN DIEGO CREEK BASIN I Pi 4 6N �cu1N COY E- Rvol CANYON \PD. 'oop WZ 10 woo P Ile .4blex-IdULLY I t L 601 ' aA CCOS VN YON and (CAF FIGURE 4 15 these in -stream basins extends from MacArthur Boulevard to Campus Drive. The realignment of MacArthur Boulevard, which will be completed with construction of the SJHTC, shall not affect the performance of this basin. 3.2.1 Bonita Channel a) Existing Conditions The Bonita Channel crossing is located within the Bonita Canyon Road and Ford Road Interchange. As shown in Figure 5, Bonita Channel currently crosses the existing Coyote Canyon Road through a double 8-foot by 6-foot reinforced concrete box (RCB). The Coyote Canyon Channel joins the Bonita Channel just upstream of Bonita Reservoir. Downstream of Bonita Reservoir, the Bonita Channel continues parallel to Bonita Canyon Road and eventually flows into San Diego Creek. The portion of Bonita Channel upstream of the confluence with Coyote Creek is herein referred to as Reach I. The portion of Bonita Channel from Bonita Reservoir to San Diego Creek is referred to as Reach II. The total drainage area of Bonita Channel basin at San Diego Creek is 3,132 acres. Under existing conditions, most of this area consists of undeveloped hilly terrain along with the Bonita and the San Joaquin reservoirs and the Coyote Canyon landfill. The landfill is scheduled to be closed down prior to construction of the Corridor. b) Pelican Hill Road Improvements The Irvine Company is planning extensive residential development within the basin, and as part of this development, the Company will build a 6.1-mile long major arterial roadway extending from the intersection of MacArthur Boulevard and Bonita Canyon Road to Pacific Coast Highway. This road is referred to as the Pelican Hill Road. Approximately two miles of the proposed alignment of this arterial from MacArthur Boulevard to the intersection of existing Coyote Canyon Road and Bonita Canyon Road, is located adjacent to Bonita Canyon channel. This portion of the roadway will ultimately be replaced by the SJHTC. Major channel improvements are planned as part of the Pelican Hill Road construction. Outflow from the existing culvert under Coyote Canyon Road will be carried in a proposed earth channel to a box culvert under Pelican Hill Road. 1 1 1 1 1 F1 I i C 1 7 L_J ��J SCOR0111.OHA -16- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 i i 1 EXISTING BONITA CANYON ROAD G-- SiVAT C -' It PELICAN Ir" RD• TO BONITA RESERVOIR/ BONITA (SEE FIG. 6) / RESERVOIR BONITA CHANNEL - REACH -I BOX CULVERTS -EXISTING DOUBLE I 8'XVRCB -- - PROPOSED CONCEPTUAL ALIGNMENTFOR BONITA CHANNEL (BOX CULVERT) CA\NYON CHANNEL FIGURE 5 c) Post Project Conditions (i) Reach I - (Bonita Channel upstream of its confluence with Coyote Canyon Channel) Based on the latest alignment of the Corridor, Bonita Channel will cross the loop ramp connecting Bonita Canyon Road to the northbound SJHTC. The portion of Bonita Canyon Road from the SJHTC mainline up to the gore of the northbound on -ramp will be built as part of the Corridor project. This stretch of the road will encroach on the floodplain of Bonita Channel. If hydraulic analysis of the flow indicates that the encroachment results in objectionable increase in backwater depths, this reach of Bonita Channel may have to be realigned and/or improved. Flow in the Channel may be carried across the ramp embankment through a box culvert. A tentative conceptual alignment for Bonita Channel at this interchange is shown in Figure 5. This alignment and the proposed conduit types indicated in the figure are based on preliminary analysis of the channel. The ultimate configuration of the facility may change during the final design phase. Based on the alignment shown in Figure 5, the Pelican Hill Road culvert and its upstream channel will be removed to accommodate the proposed bridge over the Ford -Bonita arterial undercrossing. The existing box culvert under Coyote Canyon Road may also be enlarged or removed to accommodate the new channel. According to this alignment downstream of the Corridor mainline, flow in Coyote Canyon Channel would be carried through a box culvert and then join the Bonita Channel. This confluence would be located within the loop ramp connecting the southbound Corridor to Bonita Canyon Road. The flows would then be routed through a larger proposed box culvert under Ford Road and then discharged into Bonita Reservoir. Based on preliminary hydrology studies performed by Robert Bein, William Frost and Associates (Reference 4), the peak 100-year discharge has been computed to be 2,200 cfs. Preliminary hydraulic analysis performed as part of the study indicates that roughly a double 6-foot by 11-foot RCB culvert under the interchange would provide adequate flow capacity for the computed discharge. In order to provide sufficient headwater at the SCOR0111.OHA -18- 1 culvert inlets, it may be necessary to' excavate below the existing ground surface. It should be noted that based on 'logs of borings taken by Geofon, Inc. in December 198.9, the water table in the area is only about 2 ft. below ground level. (ii) Reach II - (Bonita Channel downstream of Bonita Reservoir) The portion of Bonita Channel parallel to SJHTC downstream ■, of the confluence with Coyote Canyon is longer than a mile and meanders through an alluvium base-. The Corridor will be built directly over the channel. As shown on Figure 6, flow immediately downstream of Bonita Reservoir can be contained in the existing Bonita Channel. The existing Bonita Reservoir was built during the 1930's by The Irvine Company for irrigation of downstream agricultural fields. At present the area behind the embankment is overgrown with trees and bushes. It is not clear- if the reservoir has any more storage- capacity available to store the runoff from Bonita Channel. Additionally, intermittent flows during the year provide some dead storage in the reservoir. Figure 7 shows the average monthly runoff that could be expected into the Bonita Reservoir. Based on preliminary calculations, the total average annual runoff into the Bonita Reservoir is expected to be. about 107 acre-feet (35 million gallons). About 90 percent of this runoff occurs during the months of November through March. Therefore, any peak flow reduction at this reservoir during the 100-year storm event is considered negligible. Approximately 700 feet downstream from 'the Bonita Reservoir the natural flow path for Bonita. Channel will be blocked by the Corridor fill. This fill will be directly adjacent to a rock formation. Bonita Channel will have to be realigned through this rock formation. Downstream of these rock outcroppings, the area along the west side of the Corridor consists of flat alluvial deposits from Bonita Channel. This alluvium is approximately 150' wide and -is located between the Corridor and the adjacent rocky hills. The 100-year peak flow through this reach of the channel has been estimated to vary from about 5,560 cfs. to 6,093 cfs-. The natural slope of the ground is approximately one percent 3.2.2 Coyote Canyon Channel Currently Coyote Canyon Channel is made up of a trapezoidal earth channel, and flows from southeast to northwest. The general alignment of this channel is parallel -and adjacent to the future Pelican Hill Road. The channel will be realigned and improved as SCOR0111.-OHA -19- x x Ez W mW x J W z < \ U z CL co v z F . of � U Lu J J o� z Lu << Z �►/ Z V ti z� Z X o \b A 20 FIGURE 6 28 26 i 24 U 22 20 O 18 w cn 16 w 14 a z 12 m 10 0 8 6 0 4 w z 2 It U AVERAGE MONTHLY R-UNOFF VOLUME INTO BONITA RESERVOIR AUG SEP OCT NOV DEC JAN FEB . MAR APR MA) MONTHS NOTE: DOES NOT INCLUDE DRAINAGE FROM SJHTC. FIGURE 7 21 d part of Pelican Hill Road construction. The ultimate location of the channel will be between the limits of Coyote Canyon land fill and Pelican Hill Road right-of-way. Coyote Canyon Channel joins Bonita Channel in the vicinity of the future Ford/Bonita interchange. Based on the Preliminary Design Report (Reference 4) the peak 100-year discharge in the Creek at this point has been estimated to be 2,600 cfs. The portion of Pelican Hill Corridor will be replaced by surface will be approximately Road. As a result, parts of t the future Coyote Canyon Chan of the southbound off -ramp fr the southbound on -ramp from necessary to limit the roz building a retaining wall in build a closed box channel. 3.3 BOMMER CANYON Figure 8 indicates that approi SJHTC in the vicinity of San outside the Bonita Channel and alignment for this reach of the ridge line. Bommer Canyon lies the north; Muddy and Moro Cat runoff from the Corridor will d load along the alignment of the :he SJHTC. The Corridor roadway ?0 feet higher than Pelican Hill SJHTC embankment may encroach on :1; particularly, the embankments i SJHTC to Pelican Hill Road and ord Road to SJHTC. It may be way embankment encroachment by ie vicinity of the channel or to .mately 5,300 lineal feet of the Canyon Avenue will be located aguna Canyon Channel basins. The Corridor will be directly over a in the valley below this ridge to ►ons lie to the south. Surface scharge into these canyons. Muddy Canyon drains the area west of Sand Canyon Avenue and Moro Canyon drains the area to the east. Each water course flows through downstream undeveloped valleys and discharges into the Pacific Ocean. Bommer Canyon flows northerly where it confluences with Sand Canyon wash. This tributary of the San Diego Creek traverses Mason Regional Park along University Drive and joins San Diego Creek near the Campus Drive bridge. 3.4 Laguna Canyon Channel a) Existing Watershed Conditions The tributary area of Laguna Canyon is made up of steep canyons with fairly impervious soil. The area at present is mostly undeveloped. The main channel flows from north to south parallel to Laguna Canyon Road. The Laguna Canyon Channel crossing is located within the Laguna Canyon Road (State Route 133) interchange. Figure 9 shows the Laguna Canyon watershed and its major tributaries near the SJHTC. John M. Tettemer & Associates completed a Runoff Management Plan for the Laguna Laural Planned 1 1 11 F� 1 171 L 1.1 1 I 1 SCOR0111.OHA -22- 1 I F I I 1 I 1 1 1 I fl 1 Lu lu r►U o:LLI .......... t #� r N O Lu s cy\ W W e 1 _ tit 100w, 19 z j L) Lu OP • p .O 8 r'�L �Z ��.i (J two vi:ir� �`^�+^..,,,q�� � .. � �• �: k. Q Z '` .�1 V • z V 1 i tos cc ` G W ' r 1 oz Q h Z —` (UFO c4�• L 1 ` "J Q Z_ O _ y i (r 2� ti •—••—, Q 'X.:. tj 10 (170 "Now Yc Itsl ~: 1 L „1- ohm W 12 G Q O ZN aW U= OW �a gz 8Z WU no O ,0. ME. 1 23 FIGURE 8 CANYON 73 A�IEGO10 � �!�E 1 \ �;SA 111SAy m0,.:. i .. LAUREL CANYON Motto (EMERALD( 6-At�'ON� An��roN 6000// LC .► 7of/,d la, R wow CANY ViR \.. A .'.. LAGUNA CANYON BASIN FIGURE 9 24 1 11 Community in August 1989. According to this study, the 100-year discharge in the Laguna Canyon Channel at the corridor was computed to be 2,050 cfs. The valley below the corridor site is presently subject to regular flooding. The existing channel adjacent to Route 133 is an earth ditch 3 feet deep and 5 feet wide, overgrown with heavy brush and vegetation. It offers very little protection against a major flood. The maximum flow capacity of this facility is less than about 10 percent of the peak 100-year storm runoff. According to a hydrology study for Laguna Canyon Channel performed by OCEMA (Reference 2), the 100-year floodplain of Laguna Canyon in the vicinity of SJHTC is- about 370 feet wide with an average flow depth of seven feet. SJHTC crosses Laguna Canyon Channel upstream of confluence with Laurel Canyon. Flow in the channel downstream of this confluence is considerably higher than at the corridor. b) Post Project Conditions The Corridor crossing over the Laguna Canyon area will be on an approximately 1,200 ft. long viaduct bridge. Figure 10 shows the approximate size and location of the bridge in relation to the existing channel. The ultimate goal in this area is to preserve the riparian habitat within the existing channel and to accommodate the peak �! 100-year flow at the Corridor. Figure 11 shows Laguna Canyon Channel in relation to the SJHTC. c) Cross Culverts at Ramps Similar design considerations may also be given to cross drainage structures at the ramps within this interchange. These ramps will be on embankments. Figure it shows these. ramps in relation to the mainline. The two tributaries of Laguna Canyon Channel shown on the figure cross the ramp connecting Laguna Canyon Road to the northbound lanes of the SJHTC. Tributary Number 1 is estimated to have a peak 100-year flow of 336 cfs at the crossing'. This flow can be conveyed under a ramp via a pipe culvert, approximately 54 inches in diameter. Flow from Tributary Number 2 is about 20 cfs. The two tributaries join within the loop ramp and will flow into the main channel. per the existing drainage pattern. The combined flow in Laguna Canyon Channel will then traverse the area within the second ramp in the interchange. A box culvert approximately 10-foot by 10-foot will provide adequate flow capacity at this crossing. As an �f alternative, a grass -lined channel may provide an additional water source for area wildlife. SCOR0111.OHA -25- m ui i i 1 � I_ t 1 Ica 1 w I a i 1 N I IF 1 I a W cd I I a 3 1 N I U 1 I Z tri. L`V / W a ' W w 0 o ; y 0 (�j 0 ul 1 I oc 1 � m m z 0 a p = m 0 1 N iY Q W I a o i s � z I 1 1 U J 1 m= I m m I 1 I 1 1 1 1 I I 1 1 I 26 FIGURE 10 POSSIBLE SITE -� \ FOR ADDITIONAL STORM WATER RETENTION EQUALIZER BOX CULVERT RETARDING BASIN BOX CULVERT -TRIBUTARY #1 i l� LAGUNA CANYON CHANNEL CROSSING TRIBUTARY 02 • � �. SJHTC 9790 PROPOSED LAGUNA CYN RD 27 FIGURE 11 a d) Roadway Runoff Mitigation Based on the conceptual drawings, the Corridor will have a sag point directly at the Laguna Canyon interchange. The nearest summits on the roadway to the north and south of the crossing are approximately 11,900 and 7,400 feet away, respectively. Runoff from portions of the Corridor roadway surface between these summits will flow to the sag and into Laguna Canyon Channel. Under existing conditions this area is made up of hilly terrain covered with brush and other native vegetation. For post Corridor conditions, this area will be paved. The pavement will reduce rainfall infiltration and increase also flow velocity which will reduce the time of concentration. This will result in higher runoff rates from the site and may have a pronounced effect on the design discharge in Laguna Canyon Channel. If possible, the peak flow from the roadway should be reduced prior to discharge into the downstream valley. Two possible sites for a retarding basin are the areas within the loop ramps (Figure 11). Figure 12 shows a conceptual scheme for design of such a facility within the southbound loop on -ramp of this interchange. If additional volume for storage is needed, the area between the Corridor mainline, the loop ramp and the connector road may be utilized. This may be done by installing a culvert under the loop ramp to serve as a connector. This will allow for storage of a portion of the storm runoff within this area. These retarding basins should be designed to mitigate peak runoff from low frequency storms of 100- and 25-year as well as high frequency events of 2-, 5-, and 10-year storms. All retarding basins shall be designed to comply with the latest criteria established by OCEMA. 3.4.1 E1 Toro Creek (Niguel Creek) a) Existing Watershed Conditions The E1 Toro Creek crossing is located within the E1 Toro Road interchange. This interchange is about one-half mile east of the Laguna Canyon Road interchange. The channel flows southwesterly parallel to E1 Toro Road. It crosses the SJHTC and joins Laguna Canyon Channel about 4,000 feet downstream of the crossing, near the intersection of Laguna Canyon Road and El Toro Road. El Toro Road may be widened and realigned through this interchange. The Corridor will cross this area on an 800 foot long viaduct bridge. The tributary area of this channel at the corridor is approximately 735 acres. The area is comprised of open space and residential land use elements. Flow from the tributary area will.. be carried under the Corridor through an existing flood control system (Reference 3). As shown in Figure 13, the system consists of a 9-foot by 8.5 foot RCB and a retarding basin (country SCOR0111.OHA -28- I I RAW LAGUNA CYN RD. FLOOD CONTROL E EASMENT E &N SL' T CHANNEL 0 OV VERFLOW % % 7-J* SECTION A - A KTA CHANNNEL EQUAI 17,PR BOX CULVERT OVERFLOW ADDITIONAL STORM R STORAGE SITE WAG PROPOSED RETARDING BASIN AT THE LAGUNA CANYON ROAD INTERCHANGE 29 FIGURE 12 t 1 facilities IO2P12 and IO2B01, respectively). An estimated peak i 100-year flow of 1,375 cfs will be carried in the RCB, across the Corridor. The existing retarding basin then reduces the peak flow in the channel before it is released into the downstream natural watercourse. This flood control network, including the retarding basin, is part of the County of Orange Master Plan of Drainage Facilities. It was constructed in accordance with the Laguna Hills Area Master Plan of Drainage. The storage capacity of the retarding basin or the hydraulic performance of any of its appurtenant structures will have to be studied if changes to the Corridor or ramp alignment is contemplated. b) Roadway Runoff Mitigation Conceptual plans for the SJHTC indicate that the nearest sag point on the roadway to the north of El Toro will be at Laguna Canyon. Therefore, roadway runoff will tend to drain toward this low point. However, under existing conditions, a ridge separates the E1 Toro watershed from Laguna canyon. Diversion of flow from the E1 Toro watershed to Laguna Canyon should be avoided. It is recommended that roadway runoff from the portion of the Corridor within the E1 Toro Creek watershed be intercepted at the drainage boundary of Laguna Canyon Channel watershed. An additional consideration regarding the roadway drainage of the Corridor is the increase in the peak runoff due to the paved impervious roadway surface. This increase in runoff should be mitigated before the flow is released into the downstream natural channel. The reduction in peak flow could be accomplished by use of the existing retarding basin. One feasible alternative is to increase the area of the existing retarding basin. As indicated in Figure 13, the basin was initially envisioned to be within a loop ramp at this interchange. However, the loop ramp concept has since been abandoned in favor of the new ramp configuration shown in the figure. Therefore, the perimeter of this basin may be widened to include the area that had been allocated to the ramp roadway surface. Another alternative would be to store part of the storm water in the wetland area located under the Corridor bridge and directly adjacent to El Toro Road. This area is identified in Figure 13. The future E1 Toro Road is estimated to be about 5 feet above the existing wetland area. The water surface in this basin should be at least 2 feet below the road. Therefore, the maximum allowable depth of ponding in the basin will be about 3 feet. Note the existing E1 Toro Road is almost at the same level as the ground surface within the wetland area. Therefore, unless the road is improved, this alternative will not be feasible. SCOR0111.0HA -30- 1 �ARATO REMOUN NATURAALL PROPOSED'RAMP ENB;IGY 0lSSIPATOR / tE RI �-GN / I EXISTING GRADING FOR ABANDONED RAMP CONCEPT EXISTING I f VTO NATURAL WATERCOURSE IZ A0 EL TORO (NIGUEL) CREEK CROSSING 31 FIGURE 13 11 1 3.5 Aliso Creek Basin The Aliso Creek crossing is located between Aliso Creek Road interchange and the Alicia Parkway overcrossing. The tributary area of this creek begins at the southwest facing slopes of the Santa Ana Mountain range, in the Cleveland National Forest, and 1 extends down into the urbanized portions of Laguna Hills. The basin topography consists of steep upper canyons with no drainage improvements, covered with brush and trees, and moderate slopes in the lower canyons with extensive storm drain improvements and large residential and commercial land use elements. Figure 14 shows the Aliso Creek basin and its tributaries near the SJHTC. Under existing conditions, the peak 100-year discharge in Aliso Creek at the proposed corridor crossing is expected to be 7,300 cfs. The flow at this location has a depth of about 11.8 feet and a velocity of approximately 10 feet per second (fps). If development of the Aliso Viejo Planned Community proceeds as scheduled, there will be extensive grading and hydrologic changes within the flood plain of Aliso Creek. Plans for this development call for backfilling a portion of Aliso Creek Floodplain in the vicinity of the Corridor crossing and construction of a retarding basin downstream of the SJHTC. This proposed retarding basin will be located behind the future Pacific Park embankment across Aliso Creek. This basin will be about 2,800 ft. downstream of the SJHTC. Figure 15 shows the SJHTC in relation to the embankment. Figure 16 indicates that construction of this basin will be completed almost three years prior to completion of the SJHTC. The basin is designed as a flow -through type retarding facility with several reinforced concrete box culverts providing the outlet. According to the Runoff Management Plan for Aliso Viejo (Reference 19), this facility will effectively mitigate the 100-year flows at all locations along Aliso Creek. Based on this hydrologic study, the peak 100-year discharge at the Corridor for the ultimate improved conditions will be 6,629 cfs. Based on the hydraulic analysis carried out by Nolte and Associates (Reference 20), backwater in Aliso Creek caused by ponding at the Pacific Park Retarding Basin will increase the water surface elevation to about 215.19 ft. above MSL at the Corridor crossing or a depth of 17.19 feet and a flow velocity of about 4 fps. Therefore, these future improvements will result in a much lower velocity in the vicinity of the corridor bridge crossing during the 100-year flood. This reduces chances of scour at the abutment and the piers. However, the water surface elevation will increase by about five feet. Water surface profile under the bridge be calculated based on downstream conditions. As shown on Figure 15, ponding behind the Pacific park embankment will increase the depth of flow at the SJHTC. SCOR0111.OHA -32- 1 I t 11 H DVREFK,'-,-.5�'.::.' R, Nlb,tJEL CRF.EK/ %/, JU - MOWN, w'71 / '• 1 lool " it • CANYQN ALISO CREEK BASIN ALISO 0. ORI. 59"IN A, CO -:CHA d FIGURE 14 33 W Q G c o SUPER FLOOD W.S. CL vWL AFTER BASIN 100 -YR W.S. (EL 215.18) < AFTER BASIN a 100 - YR (EL 209.87) BEFORE BASIN TREAMBED EMBANKMENT ALISO CREEK N..3 * MAGNITUDE OF THE SUPERFLOOD HAS NOT BEEN DETERMINED (SEE SECTION 4.2). PROFILE FOR ALISO CREEK FROM THE CORRIDOR TO THE PACIFIC PARK RETARDING BASIN 34 FIGURE 15 1 f 1 1 I 1 1 1 1 1 1 1 1 1 1 y 1 1 Z O O Z Q HV Om ay N Z ZO LQ v r JLu J 2� Z J Cy O Q N 35 FIGURE 16 3.5.1 Narco Channel (North Sulphur Creek) The portion of the Narco Channel watershed located upstream of the proposed corridor is drained through two existing storm drain facilities (Reference 5). As shown in Figure 17, one is made up of a 102 inch RCP referred to as County facility J04 (see Section 2.2.2). It crosses the SJHTC between Moulton Parkway and Pacific Park Drive. The other consists of a 90-inch RCP referred to as County facility J04P02 located within the La Paz Road interchange. Both of these facilities are designed to carry the peak 25-year discharge, based on the 1973 edition of the OCEMA Hydrology Manual. According to the construction drawings, facility J04 was designed for the 25-year peak flow of 1,097 cfs. Based on preliminary hydraulic analysis of this storm drain, it has a maximum flow capacity of 1,434 cfs. According to the calculations for the J04 storm drain (References 15 and 9), in the event of the 100-year storm, approximately 515 cfs of excess discharge will spill over onto Pacific Park Drive. The water surface elevation in the street due to this overflow will be about 214.4 feet above MSL, with a velocity of about eight fps. This elevation is below the curb elevation and hence Pacific Park has adequate flow capacity to contain the overflow from this drainage crossing in the event of the 100-year storm. 3.6 San Juan Creek Basin Although San Juan Creek does not cross the project alignment, three major tributaries within its watershed do. These are Oso Creek, Trabuco Creek, and Horno Creek. Figure 18 shows this basin along with its major tributary channels in the vicinity of SJHTC. 3.6.1 Oso Creek The steep upper reaches of this watershed are in the O'Neill Regional Park and extend down into the developed areas in Mission Viejo. The major and central portion of the watershed is occupied by Mission Viejo, a modern urban, unincorporated community. The downstream one-third of the total channel length is within a relatively narrow flood plain that has not experienced development to the same extent as the contributing urban watershed. Camino Capistrano, an old (ex -state) highway constructed in the 1920's by the first interstate road building program, lies parallel with Oso Creek and the San Diego Freeway. A mainline railroad runs parallel to Oso Creek and Camino Capistrano. The portion of Oso Creek from Crown Valley parkway to about 1,600 ft. downstream has a combination of concrete and rock riprap SCORO111.OHA -36- I 1 I Nol"Inow W N VO c m w CC a L '�'6y = i � � d�iy� O. Z z 3 �bd Z o= N Q aU z O OV a Z Q Z -08 � Tea 37 FIGURE 17 . - AN& ct, SJHTC CREEK OPTION 2 OPTION 1 XHUFL MEK, SER01 IR §WLPHUR REEK 40� INS oof 1 Buco �� 1-JON, -'"NO EEK "-AYCREEK s JON TEEM �tio�t J MM LM J 1 �l I �f 1 I LF1 I � I 1 A bAN JUAN tMEEK BAUM 38 FIGURE 18 i t I paving along the west side. The next downstream reach is a natural channel, meandering through a marsh and turns south towards the Avenida De Las Flores bridge. The channel downstream of this bridge (Reference 13), is made up of a rectangular reinforced concrete section, 28 feet wide and 12 feet deep. Based on hydrologic analysis of Oso Creek (Reference 6), the peak flow at the SJHTC is expected to be 6,200 cfs. The study assumes that a proposed retarding basin would be in place upstream of the study. This basin known as'the Galivan'Retarding Basin, is to be located north of Crown Valley Parkway and west of the railroad tracks. If the retarding basin is not in place, then the peak 100-year storm runoff at the SJHTC is estimated to be 10,200 cfs. The existing facility will not be able to contain this discharge and the resulting overflow will inundate surrounding areas. Post Project Conditions - There are two alternative alignments for the SJHTC in the vicinity of Oso Creek. Option 1 - As shown in Figure 19, Option 1 alignment joins I-5 south of Via Escolar Paseo De Colinas. Under this option, the Corridor will will encroach on Oso Creek between I-5 and.Paseo De Colinas. Therefore, the Creek will have,to be realigned. This portion of Oso Creek is a remnant of the natural channel, meandering through a lush marsh. Flood control- improvements in this area will impact a portion of the existing wetland habitat along the Oso Creek floodplain. A grass -lined channel could be constructed from Paseo De Colinas to a point approximately 1,800 ft. upstream where it will join the existing alignment. of the. Creek. Option 2 - Option 2 _alignment will join I--5 in the vicinity of the Avery Parkway interchange with I-5. Under, this option, the Corridor will be on a 2,800 ft. long viaduct bridge. This option proposes that the grade of I-5 be lowered to accommodate a reconstructed Avery Parkway over I-5. Approximately 7,000 ft. of the I-5 freeway will be relocated both horizontally and vertically. The horizontal realignment will shift I-5 approximately 100 ft. westerly to minimize the right-of-way impacts of the northbound corridor alignment as it diverges from I-5 southbound. The vertical alignment adjustments allow 'I-5 to pass under Avery Parkway and, other future extension of Via Escolar. This allows ramp movements to, and' from both the Corridor and I-5 from Avery Parkway and cross -freeway local access at Via Escolar between Rancho Viejo Road and Camino Capistrano. SCOR0111.OHA -39- 40 FIGURE 19 �' I The vertical realignment of I-5 will result in a ' sag approximately at I-5 station 700+00. The ultimate grade on I-5 will be about in Oso Creek 18 feet below the 100-year water surface elevation at this point. Figure 20 shows the future I.-5 section in relation to Oso Creek and the _SJHTC connector roads. The depressed section of I-5 will be well protected against any overflow from Oso Creek by an existing levee along the AT&SF Railroad tracks and a future retaining wall along the SJHTC. In order to drain the sag location on I-5, an underground reinforced concrete storm drain, approximately 72 inches in diameter may be run about 3,500 ft. southerly where it will join Oso Creek. Another option would be to install a pump station to pump roadway drainage into Oso Creek. ' Since the County of Orange does not yet have a definitive timetable for construction of the Galivan retarding basin, it would be prudent to design the corridor crossing at Oso.Creekfor the maximum runoff rate of 10,200 cfs, without any peak flow attenuation. This flow may be carried across the Corridor in the existing natural channel. Construction within the channel floodplain shall be minimized. Design of the SJHTC over this channel should be such that if the 100-year storm occurs prior to construction of the Galivan Basin, the corridor does not obstruct the overbank flow path.. Any obstruction of this flow could result in adverse backwater effects and increase the depth of flooding upstream of the corridor. Detailed hydraulic analysis of this reach, will be performed during the final design phase of the project. 3.6.2 Trabuco Creek Trabuco Creek crosses the existing San Diego Freeway (I-5) in the City of San Juan Capistrano. Although this channel does not cross the SJHTC, the portion of I-5 over the Trabuco Creek will be widened as part of the SJHTC Project. Therefore, the existing freeway bridge over Trabuco Creek should be studied and modified to,accommodate the new roadway width. According to the hydrology report for this channel (Reference 7) the Peak 100-year flow in Trabuco Creek at the San Diego Freeway is estimated to be 18,500 cfs.. The most recent major flood of record at this crossing occurred in February 1969 (Reference 8) and the peak flow in the channel'was measured to be 8,000 cfs. This flood heavily damaged the Camino Capistrano Bridge. over Trabuco Creek located a -few hundred feet downstream of I-5. However, the I-5 bridge was not damaged by this flood. 3.6.3 Horno Creek Horno Creek crosses I-5 freeway approximately 2,000 feet north of SCOR0111.OHA -41- a Q O0 CL (L 260 - � _ w w a a La W ZLu Z— U �~ �- m0 cl)O ¢ WW to wo WO V ?.4ii_ OLD 238.8 W.S. Z O ¢ av RETAINING WALL 230 - - c o w + c ' oil � o 220 - ct a N SECTION A --A 210— SCALE: H:1• - IW V:1• • IV PROPOSED 1- 5 GRADE IN RELATION TO OSO CREEK 42 FIGURE 20 I Ortega Highway. The portion of I-5 over Horno Creek ek will be widened as part of the SJHTC project-.. The drainage basin for Horno Creek rises in the hills adjacent to Plano Trabuco at an elevation of 900 feet above MSL. The main channel in the watershed flows southwesterly. After crossing I-5 north of Ortega Highway, it then turns southerly and crosses the interstate highway again south of Ortega Highway and eventually joins San Juan Creek approximately 1,200 ft.. downstream of I-5. Based on the hydrology analysis of this watershed (Reference 14); the peak 100-year flow in Horno Creek at I-5 is 3,200 cfs. Originally this crossing consisted of a 268 ft. long 10-foot by 8-foot RCB culvert. Later an 8-foot by 8-foot RCB was added next to the existing conduit to increase the flow capacity. As part of this project I-5 freeway will be. widened by the addition of one lane in each direction. in the vicinity of this crossing. Therefore, the existing box culverts will have to be extended to accommodate this new roadway section. The existing culvert has a pronounced angle of skew with the freeway. - The alignment of the two culverts -'also makes a sharp turn in the southerly direction immediately downstream of the freeway. Therefore, the exact length by which these culverts should be extended will have to be determined during the preliminary design phase. i i 1 r ISCOR0111.OHA -43- 4. BRIDGE CROSSINGS The bridge crossings presented in this report are those related to large drainage systems crossing the Corridor. 4.1 Basic Information The bridge information included is based on the SJHTC Conceptual Bridge Type Study (Reference 21). The list includes drainage crossings from north to south as they occur along the SJHTC. The length and location of the bridge structures are approximate and are subject to change as the design develops. 4.2 Bridge Design Criteria Caltrans criteria requires that bridges be designed such that they can pass the 50-year flood or the greatest flood of record, whichever is greater (Reference 17). Freeboard, vertical clearance between the lowest structural member and the water surface elevation of the design flood, should be sufficient to pass the 100-year flood. Bridge crossings over channels owned and maintained by the County of Orange shall have a minimum freeboard of 2.0 feet for the design flood. In order to perform the preliminary analysis of corridor structures over major stream crossings, the peak discharge, water surface elevation, and velocity corresponding to the 100-year flood are included in this report (Table 3). The peak discharge values are based on previous hydrology reports for the watersheds along the corridor, furnished by OCEMA. Some of the data regarding the water surface elevation and velocity of flow is only approximate. Additional analysis may be required to arrive at more accurate values. The Federal Highway Administration (FHWA) requires that bridges be designed to withstand the effects of scour from a superflood (Reference 24). A superflood is defined as exceeding the 100-year flood. According to FHWA Standards, if the magnitude of the 500-year flood is not available, then a bridge should be designed to withstand the scour caused by a flood with a peak discharge of 1.7 x Q ; unless this value is exceeded by the greatest flood of recaps. Protection of bridge foundations against scour shall be accomplished by rock revetments or other appropriate channel improvements. Bridge piers shall be protected from damage by pier nose extension (debris walls) or other appropriate means. 4.3 Summary of Conceptual Bridge Crossings Following is a brief description of the proposed bridge crossings SCOR0111.OHA -44- for the SJHTC. Table 1 summarizes the salient features of each structure. San Diego Creek - As shown in Figure 21 the Corridor crossing over San Diego Creek will consist of two parallel bridges with total lengths of approximately 1100 feet each for the main line. Additionally, there will be a 480-foot Iong collector road bridge crossing the creek approximately 140 feet downstream from the mainline bridges and the future HOV on -ramp bridge, approximately 500 feet in length, located between the two mainline bridges. Laguna Canyon Channel - The Corridor crossing over Laguna, Canyon Channel will consist of four separate structures shown on Figure 22. The southbound and northbound lanes of SJHTC are separated by an 88-foot wide minimum median providing for ,future widening. A connector road from Laguna Canyon Road to SJHTC northbound lanes is located upstream of the main line. A loop ramp and a collector road cross Laguna Channel downstream of the -main line. The mainline bridge structures over the channel will be approximately 1200 feet in length. The mainline roadway surfaces will be about 50 feet above the canyon floor. Aliso Creek - The bridge over the creek that there will be at least two feet will be designed such of freeboard during a 100-year storm. Preliminary plans for the Corridor show that the roadway elevation over the creek is approximately 224 feet above MSL with the water_ surface elevation at about 215 above MSL. This crossing will be made up of two separate, structures; one for the northbound lanes and one for the-southbound lanes. The bridge lengths will be determined by wetland preservation requirements. Each structure will be about 75' feet wide with a 68-foot wide median in between for future improvements. Oso Creek - The portion of SJHTC crossing over Oso .Creek is a viaduct bridge connection between I-5 and the SJHTC. The Corridor is actually made up of, two bridges; one for the southbound lanes and one for the northbound lanes. The two structures are separated by a median of varying width. Trabuco Creek - The I-5 crossing at Trabuco Creek is about 240 feet long measured along the center line of the freeway and consists of five spans. The soffit of the bridge will be. approximately at elevation 205 feet above MSL level. The proposed improvements at this crossing call for adding 12 feet on the outside and 15 feet on the inside of the northbound bridge, and 36 feet'on the outside -of the southbound lanes. The following table is a summary of the bridge crossings along the project, with Peak 100-year discharge values and approximate length of each bridge. SCOR0111.OHA -45- I. N.T.S. CDR. 0 o v c �RFEK a a� 2 t� LEGEND: EM BRIDGE DECK SAN DIEGO CREEK BRIDGE 46 FIGURE 21 I I I I I LI 11 1 1 I H.TA Ad MED. 04* vocloo cc ld w CC iO3 O 0- LEGEND: BRIDGE DECK LAGUNA CANYON BRIDGE 47 FIGURE 22 Discharge Length Stream (CFS) et San Diego Creek 41,600 1,110 Laguna Canyon Channel 2,850 1,210 Aliso Creek Channel 7,300 380 Oso Creek Channel 6,300 3,560 Trabuco Creek Channel 18,500 240 SCOR0111.OHA _48_ 1 1 5. CULVERT CROSSINGS 5.1 General In addition to the bridge crossings described in Section 4, there are several minor creeks, ditches -and valleys that cross the corridor, shown in Figure 23. The 'type of structure proposed at these crossings may consist of a pipe or box culvert depending upon the size of drainage basin, peak design flow and local conditions. Following is a brief description of the salient information related to these crossings: o Pipe culverts are generally used to drain flows,.from small drainage basins. The minimum pipe size recommended by Caltrans Design Manual is IS inches; however, if pipe runs exceed 100 feet between inlet and outlet, the minimum diameter of pipe to be used is 24 inches. The maximum size is 95 inches. If a larger pipe is required, multiple pipes or a box' culvert is recommended. The material of the proposed pipe culverts is assumed to be reinforced concrete. Other materials may be utilized- as required. Corrugated- metal pipe is recommended for temporary drainage during construction. During final design., pipe material shall be specified in conformance with the Caltrans Highway Design Manual (section 820-4), and Caltrans District 7 Hydraulic Design and Procedures Manual (References 17 and 18.). o During preliminary design, when Corridor grading slopes are determined, culvert alignment and profile will be defined. At that time, smaller crossings may be combined to minimize the cost of - the drainage structures. o Box culverts are generally utilized for larger flows. Reinforced concrete box culverts can be single, double, or triple box, depending on the design discharge, cover and alignment. Where the use of a bridge or box is optional/marginal, an economic analysis is performed to select the one with the least cost. Under certain conditions, environmental considerations may dictate the use of a bridge crossing instead of a box culvert. ISCOR0111.OHA -49- is )133Ho c _ -._._ oq � Y LU III O ¢ H33d0 Y W W cc a 0 m -o JI J W W Z' m Ell ttc� A a 'c c Hul 0W _ 0¢ `a a 08 • p S� ° 50 FIGURE 23 5.2 Methodology The* methodology used for performing the hydraulic design of culverts is based on the criteria and guidelines recommended by Caltrans (Reference 17). A culvert should be designed such that it can pass the 10-year flood without causing the headwater elevation to rise above the inlet top of the culvert, while able to pass the 100-year flood without causing objectionable backwater depths or outflow velocities. Design of all drainage structures, including on -site storm drains, shall be such that they do not result in any damage to, or encroachment on, adjacent properties. Natural runoff from -any basin should be left undisturbed. Length of the crossings is determined by scaling the culvert length on the 200-foot scale drawings, then, adding an additional 50 to 75 feet to account for headwalls, wingwalls, riprap and energy dissipator structures. Figure 24 shows a typical culvert through a fill section of the Corridor. 5.3 Summary of Conceptual Culvert Crossings A culvert listing for the SJHTC is presented on Table 2. Culverts are listed as they occur from north to south. Stations - shown on this table are approximate and are subject to change. The culvert distance to the nearest arterial crossing has been approximated and provided for future reference. Tributary drainage area and 100-year peak discharge are shown on the tables. The drainage table listing also includes culvert number, size and length. The average culvert size is based on the sum of the culvert areas times culvert length divided by the sum of the culvert lengths for that section. The average culvert size should be increased to the appropriate pipe diameter of commercially manufactured pipe for cost estimate purposes. I r ISCOR0111.OHA -51- 6. SUMMARY The foregoing sections of this report have included the objectives of the study, assumptions, design criteria, methodology, and hydrologic and hydraulic design features related to major and minor stream crossings. The results presented herein are based on conceptual level of s information available on the project at the present time. Consequently, the sizes of culverts and bridges, and their locations should be considered as preliminary. Detailed calculations will be performed during the design phase of the project. I � I � I � SCOR0111.OHA -52- 1 1 1 1 1 1 REFERENCES 1. Hydrology Report - San Diego Creek Watershed Model (F06) Including Lower Peters Canyon Wash (F06) Prepared by: County of Orange May 1986 2. Prepared by: The Keith Companies Prepared for: County of Orange June 1988 3. Hydrology and Hydraulic Design Report for Facility IO2BOl Basin Prepared by: Van Dell and Associates, Inc-. Prepared for: Kathryn G. Thompson Development -Company July 1988 4. Bonita Canyon Hydrology at Mac Arthur Boulevard. Prepared by: Robert Bein William Frost & Associates Prepared for: The Irvine Company February 1989 5. Prepared by: Jack G. Raub Company February 1985 6. Oso Creek Channel Hydrology Study Prepared by: Rivertech, Inc. Prepared for: Orange County -Environmental Management Agency May 1987 7. Hydrology Study for Trabuco Creek Channel Prepared by: Rivertech, Inc. Prepared for: County of Orange June 1987 8. Flood Plain Information San Juan Creek Orange .County, California Prepared by: Corps of Engineers, U.S. Army Prepared for: Orange County Flood Control District November 1970 ISCOR0111.OHA -53- REFERENCES (Continued) i 9. Flood Plain Hydra lic Studv State Route 73 Prepared by: Project Planning Division, Orange County Environmental Management Agency April 1988 10. San Diego Creek Project Report Prepared by: Simons, Li and Associates Prepared for: County of Orange October 1987 11. San Joaquin Hills Transportation Corridor Draft Environmental Impact Report 0494 Prepared by: County of Orange, Environmental Management June 1988 Agency 12. Flood Plain Information San Diego Creek Prepared by: Corps of Engineers, U. S. Army Prepared for: Orange County Flood Control District June 1972 13. Plans for L03. Construction of Oso Creek Channel, Facility Number Prepared by: Lowery and Associates January 1984 14. Hydrology Study for San Juan Creek Channel Prepared by: Rivertech, Inc. Prepared for: Orange County Environmental Management Agency June 1987 15. Hydrology Calculations For the Drainage Areas Tributary to the J04. J04P03. and J04PO4 Storm Drains Prepared by: Jack G. Raub Company December 1986 16. Orange County Hydrology Manual Prepared for: County Environmental Management Agency Prepared by: Williamson and Schmid, Civil Engineers Irvine, CA, October 1986 1 SCOR0111.0HA -54- 1 17. Highway Design Manual State of California Prepared by: Department of Transportation (Caltrans) Fourth Edition January 1987, updated, August 1988 18. Hydraulic Design and Procedures Manual State of California - Department of Transportation, Prepared by: (Caltrans District 7) September 1985 19. Aliso Creek Peak Runoff Mitigation Plan within Aliso Vieio Prepared by: John M. Tettemer & Associates July 1988 20. Aliso Creek Flood Plain Study Prepared by: Nolte & Associates November 1988 21. San Joaquin Hills Transportation Corridor Bridge Tune Study Prepared by: CDMG December 1989 22. San Joaquin Hills Transportation Corrido Co ce tug 11200-foot Scale Plan and Profile" Prepared by: CDMG September 1989 23. Sail Survey or orange counry ang western rarL. vi itlVGir71M�► County. California Prepared by: U.S. Department of Agriculture, Soil Conservation Service and Forest Service September 1978 24. Interim Procedures for Evaluating Scour at Bridges Prepared by: U.S. Department of Transportation, Federal Highway Administration September 1988 25. Protect Manual. -Volume III - Design Guidelines Prepared by: the CDMG Prepared for: the Transportation Corridor Agencies December 1989 26. Hydraulic Design of Flood Control Channels, EM1110-2-1601 Prepared by: Department of the Army Corps of Engineers July 1970 ISCOR0111.OHA -55- u 1 1 1 1 1 WATER QUALITY ANALYSIS SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR PREPARED BY LSA ASSOCIATES, INC. 1 PARK PLAZA, SUITE 500 IRVINE, CA 92714 (714) 553-0666 LSA PROJECT #TCA901A July 17, 1990 WATER QUALITY ANALYSIS STUDY METHODOLOGY A 1985 study, Forecasting Pollutant Loads from Highway Runoff (Kerri, et al., 1985) as contained in The Transportation Research Record 1017, developed a methodology for forecasting pollutant loads from highway runoff based on data collected from freeways in Contra Costa and Los Angeles counties. The I-405 Freeway which was evaluated in the study has similar precipitation and travel characteristics to the proposed project. The Kerri study originally evaluated 31 contaminants in freeway, runoff water to determine which might potentially have significant concentrations with respect -to EPA and CRWQCB (California Regional Water Quality Control Board) standards. Of these, 21 contaminants were determined to be appropriate for further study of .potential impacts. This further study noted that sulfate, iron, chromium, copper, manganese, nickel, bicarbonate ion, carbonate ion, calcium, magnesium, chloride, mercury, molybde- num, potassium, silica, and sodium exhibited a first flush pattern (first flow of runoff after a heavy rain) with insignificant loads with respect to State and federal standards. However, the study also noted that calculations of constituent loads of chemical oxygen demand (COD), filterable residue (FR), total lead' (Pb); total Kjendahl Nitrogen (TKN), and total zinc (Zn) should be made for proposed high- way projects where the ADT is at least 30,000 vehicles, and -sensitive water bodies exist nearby. Because the proposed Corridor would carry 869000 to 156,000 vehicles per day (toll -free condition), such calculations were per- formed for the Corridor by affected watershed. In addition, because_ oil and grease are contaminants of concern with respect to highway -runoff, estimates of these pollutants are also provided. It is noted that this analysis was: conducted for the Convent.ionai'Alter- native design for the proposed project, given its larger overall surface area for a worst case estimation of pollutant loading into project area drainages. The Kerri Study developed regression equations to forecast pollutant loads from highway runoff into receiving waters. The following is excerpted from that study. Linear regression equations were tested and evaluated using the number of vehicles during the storm event as an independent variable to quanti- fy loads of lead (Pb), zinc (Zn), filterable residues (FR)-, chemical oxygen demand (COD) and TKN (total, Kjeldahl Nitrogen). The criteria for -using the study's forecasting equations are the following: 1) there must be a sensitive receptor nearby (e.g., stream which supports aquatic life),-2) a minimum of 30,000 Average Daily Vehicles on the transportation facility, and 3) average annual rainfall of area between 18 and 24 inches. The study considered the volume of runoff that results from both intensity and duration of a storm event. 1 ,Fl The following linear regression equations were evaluated and found accept- able for the five pollutant chemicals: Pb = 14.3 + 0.00189 (ADT) Zn = 14.3 + 0.00060 (ADT) FR = 5360 + 0.140 (ADT) COD = 3590 + 0.221 (ADT) TKN = 150 + 0.00342 (ADT) Pollutant concentrations were analyzed assuming a 0.5 inch rainfall over a ' period including both AM and PM peak traffic hours (12 hour storm duration). The 0.5 inch storm event was utilized because it represents a typical size of storm event for the project area during a 12 hour period. "Major storm events" would occur less frequently and generate a much larger quantity of rainfall than 0.5 inch; for example, in the project study area, a 2 year event would generate approximately 1.52 inches, a 10 year event would generate 2.72 inches, and a 100 year event could generate 4.13 inches during a 12 hour period (Al ' Nestlinger, Chief of Hydrology, County of Orange Environmental Management Agency Floor Program Division). Even utilization of a 2 year storm event would be inappropriate as this amount of rainfall is typically three times the amount of the 0.5 inch amount and would further dilute concentration in downstream runoff. Impacts to local surface water are spread out over 11 different watersheds which the Corridor transects. Table A provides the amount of runoff calculated for each drainage area affected by the corridor, based on the approximate length of the Corridor through each watershed, average pavement width, average daily traffic along the Corridor at those locations. The pollutant generation factors utilized in the Kerri Study assumed a two to three acre watershed, while the project watersheds range from about 10-80 acres, therefore these factors were adjusted for the larger watershed areas found in the project alignment. The pollutant loads and concentrations shown on Table B are from runoff as it leaves the Corridor. By definition, pollutant loads are the total weight of pollutants in runoff (mass per unit of time or mass per unit of area per unit of time). The pollutant concentration is the ratio of pollutants to a given volume of water in parts per billion (mass per volume). For proper inter- pretation of Table B, it should be noted that the numbers in each column are two separate calculations; the first number represents the concentrations of each pollutant in milligrams/liter, and the second number represents the total runoff pollutant loading in grams. Oil and grease quantities have been estimated on the basis of ranges developed by the State of California and FHWA, as presented in a 1983 report (Transportation Research Board, 1983). These ranges are very broad; however, because of the large size of the project and infrequent rains, per -storm load- ings of oil and grease are probably near the high end of the range. Without mitigation, the project -added quantities of oil and grease would have a cumula- tive effect upon the downstream drainages discussed below. F I ' Unmitigated, of g pollutant concentrations and loads could be reduced down- stream as the flow proceeds overland and in stream- courses. The amount of reduction would depend on specific drainage design, mitigation measures em- ployed, and soil and vegetation characteristics in drainages downstream. However, proposed project will include a Runoff Management Plan which will specify provision of facilities to route and detai-n runoff from the Corridor. The facilities would be designed to prevent pollutant loadings and oil and grease above critical levels' from entering downstream drainages. ANALYSIS RESULTS FOR AFFECTED DRAINAGES The following describes the results of the pollutant loading calculations for each drainage area downstream of the proposed Corridor. Short-term and overall impacts of these pollutant loadings and concentrations are also dis- cussed. 1. Upper Newport Bay Ecological Reserve The Upper Newport Bay Ecological Reserve is located approximately 1,500 feet west of the proposed Corridor alignment. This State Reserve is a valuable wildlife and ecological resource area. As such, impacts to upstream water sources are important to the water quality downstream in the bay.. The proposed Corridor does not directly intrude.on the State Reserve; however, the San Diego Creek Channel, which is the major upstream water source flowing -into the bay, is crossed by the Corridor. Several small drainages, including Bonita Creek, Bommer Creek (via Shady Creek), and Coyote Canyon Wash (via -Bonita Creek) feed into San Diego Creek. Any discharge of fill or dredged material in Bonita Creek or the San Diego Creek Channel will require a 404 Permit from the Corps of Engineers because the ecological reserve may be impacted. Short-term impacts originating from construction, equipment storage and grading. near the San Diego Creek Channel may affect downstream water quality in the bay, and may therefore require mitigation. Without mitigation, post -construction degradation of the water quality of this area would occur from pollutants associated with Corridor runoff. As the calculations in Table B indicate, the project would contribute significant pollutant loads into San Diego Creek, and Bonita, Bommer and Coyote Canyons, which drain into the Reserve via San Diego Creek. However, actual impacts from these canyon drainages to the loadings in the Reserve are dependant upon actual storm characteristics, including duration and intensity of rainfal'l. The more significant the storm event, the more diluted the concentration of pollutants. However, incremental degradation of water quality in the Reserve is likely as a result of total increases in contaminant'l-oadings from project runoff., The following quantities of pollutant loading for the Upper Newport Bay Ecolo- gical -Reserve are cumulative totals from San Diego Creek, Bonita Canyon, Bommer and Coyote Canyons as listed in Table B for each type of pollutant. The quan- tities listed in the Table are given in grams and discussed below in pounds (approximately 454 grams per pound) for further understanding. 1 Per Regional Water Quality Control Board Standards t 1 A. 10 c l0 Ln j .-r M 1� t0 .� 4 �1 N �L d' LC) i rl rl P" 1� d' Lid i ti ".4 co V• .� v s LA A. L W � Z Li. O "r O CVst N e)• to Ln N CD ce ci Q w W V co tD N PI- 00 M fLA O .r s W O ' L. G i at N Ln N M Q CC W O W C LL. O O O O O O O_ LG N N N N N N CV N N O =lp Q a G. 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C7 i \ O O O ti N N O N ti O NO 03 \ M Of J (p� a cy M H F M ca co It \ nii � � O � ti � •O M 10 f� M •O M �- O., - O Ln "p�'j S Q S •O Ln �T O. e� r• N Y = J t7 Or M M 't COp v< v O O O O O O O O O 8 M M O M Gi H N N N N N N N N N LnM 10 vv= f\ N M O •"• 1-0 - M S M N 1 0 M N .O v O a � M coN O M J f\ .t N .T N N e- .- Ln J V O O O O O O O O N O M '.0 INS• •O NO► uOi I.- a- •- •- •- •- -- ' � a- C7 \i wr0 N aO. r T pNp �O O W O ••• M M M r J v ti N a M f\ �o 10 O co 4' M �O •C •O 10 •O .O f� M H O O O O O O O O O \ i N N N N • V1 N O M cm A r Qs -a �O OQO M OMO O v N O pp�� N M N M S J _Q 19 a a 0\0 a a O t 1 v a J v dC r- — •- e- •- •- N � r NOf ..- � z41 I� N C' O c Ol 10 M � In N = •u O O am M 7 LA co N 6 N 2. 1 IT M m v O O • \ y O N N C`1 o 4+ �t 10 m N s �- �- ? V V L L L 61 .f N � Of 2 U •� M •O f� v A a0+ O - O 0 L 0 •- 4- 0* L . ..mn O L M W C N C w N fA U 75 . C Vf 'L m C U C O �Q Y •r OC C.7 >. �. N �. 7Cm C C Y Ol y = y U U U U mo C L 61 d OC m C am+ L y0i J L m V GJ m W O L iO• tOA d w m O O m rc N m m i..l J O W 3 < U N O K N L i+ 1- y •` C Cm. 'pCy L l0 cu pU N C 2 m t - Ol N S y C - y i+ N U CI •O t 0 d! w- M y O Q N C 7 U m U 1- •� d � N V O 2 L. ^L EM. to a • U. 00 'O O. �� 4012 U� 5 m Y. O L- L a`+ O L c cc Y \ C 0 0. �m L. 4- 0 U W C -• . L O m v E L O = a a+ - y 2 pL W Q J G•0N. r+ L J+ O C d c •- v •� 7 � 67 C G1 m d O C m a+ +1 m H m •� C C L C. •- L •. 7 U d W W O•- t C IM•- cm 0 72 d' m t 7 N M M C s m O mm C E S L C .� L. 07m oma+ to CAL m H •O •O O 40 y me N NyyE cc Nag qc y Y O 10 a V7 (AO •- •- O. -J tcc-4+W G! U L 0 O y N M About 11 pounds of zinc, 31 pounds of lead, 2,775 pounds of filterable residues, 3,844 pounds of chemical oxygen demand, and about 70 pounds of nitro- gen would be added to the San Diego Creek watershed in each major storm event (0.5 inch) without mitigation. In addition, up to 490 pounds of oil and grease would be washed into this watershed in a major storm event (although this amount could potentially be much lower due to the range of variation permitted by the equation for calculation of oil and grease factors). As noted above, an unknown percentage of these pollutants would be filtered out by plants and soil prior to reaching the Reserve. It also should be noted that some of these contaminants are already being deposited in the area by vehicles which would be ' shifted from alternative routes to the new Corridor. 2. San Diego Creek Channel ' Impacts to the San Diego Creek Channel were previously identified in the discussion of the Upper Newport Bay State Ecological Reserve. Bonita Creek, which currently flows into the Channel, would continue to discharge into the Channel; however, the Creek will be realigned and partially established under- ground. The proposed bridge over the San Diego Creek Channel would be approxi- mately 500 feet long and 40 feet above the water level. Short-term construc- tion impacts from grading, framing, equipment storage, vegetation destruction, etc., may occur to the nearby channel. Within the general area is the San Joaquin Marsh, a part of UC Irvine. The marsh would not be affected by the proposed project as it lies approximately 2,000 feet east of the Corridor. As mentioned earlier, Bonita Creek would be relocated and partially covered by the project before it outfalls into the San Diego Creek Channel. Post -construction water quality impacts on this creek from highway runoff would be as described for the Reserve, above. 3. Bommer Canyon Primary construction impacts occurring in this area would include sedi- mentation from the Corridor section within Bommer Canyon. Downstream sedimen- tation potential would require mitigation to minimize impacts and maintain existing levels of water quality. Highway runoff water quality impacts from Bommer Canyon would contribute approximately 60% of the contaminants described above for the Upper Newport Bay Ecological Reserve. 4. Bonita Creek This section of the Corridor would impact Bonita Creek west of the reser- voir, and would require the realignment and undergrounding of the Creek. The approximately 10,000 linear feet of Corridor alignment in the Bonita Creek Watershed would add 10 pounds of lead, 3.6 pounds of zinc, 910 pounds of filterable residues, 1,265 pounds of chemical oxygen demand, 23 pounds of nitrogen, and up to 150 pounds of oil and grease to the Bonita Creek drainage, if not mitigated, in a typical day -long storm (0.5 inches). Concentrations of each of these pollutants in the Corridor runoff would be high in comparison to the applicable standards (see Table B). Dilution levels in the Creek are not known; however, the concentrations are likely to be significant given the area's relatively low level of development. As noted above, some of these 6 1 1 u ' pollutants would incrementally affect water quality downstream in San Diego 9 Creek and the Upper Newport Bay Ecological Reserve. 5. Aliso Creek/North Sulfur Creek The proposed project alignment proposes a 500 foot long bridge over Aliso Creek. A large fill embankment across .a portion of the low lying area adjacent to Aliso Creek would be necessary for the Corridor. Siltation may occur from the fill embankment grading, and from stockpiling of necessary material. Likely construction impacts occurring to Aliso Creek include. erosion and sedi- mentation in downstream areas. Once the project is constructed, runoff would flow into the Creek directly from the adjacent 16,000 foot long segment of the Corridor, as well as from Wood Canyon. As indicated in Table B, about 15 .pounds of'lead, 5.7 pound's of 1,460 pounds of filterable material, 1,980 pounds of chemical oxygen demand,� 37 pounds of nitrogen, and up to 245 pounds of oil and grease would be added to this watershed in a typical day -long storm. About 87% of these pollu- tants would flow directly into the Aliso Creek Watershed, and 13% would be contributed via the Wood Canyon tributary. As with the other watersheds in the vicinity, concentration levels of these pollutants in highway runoff immed- iately downstream of the Corridor would be high in comparison to applicable standards (given in Table B). 6. Wood Canyon This area is intersected by the Corridor, and upstream related grading would increase downstream sedimentation in the Wood Canyon drainage. This drainage flows further south into Aliso Creek and sedimentation could, be signi- ficant, if not mitigated. Highway runoff pollutant effects on Wood .Creek are discussed above in combination with Aliso Creek. Concentration levels in the highway runoff would be above the applicable standards. Mitigation will be required to minimize potential water quality impacts to this canyon. 7.Laguna Canyon and E1 Toro Creeks Laguna Canyon and E1 Toro Creeks would be crossed by the Corridor align- ment and the interchanges at Laguna Canyon and El Toro Roads. A minor realign- ment is planned for Laguna Canyon Road which may impact the water quality of the adjacent Laguna. Canyon Creek. Construction of the proposed project would rely on undergrounding Laguna Canyon Creek and local drainage systems to collect runoff and minimize potential water quality impacts. Runoff from the highway would flow into the Laguna Canyon and E1 Toro Watersheds, as well as into Upper Laguna Creek in the Sycamore Hills area. A total of about 2.0 acre-feet would run off of the roadway into these streams during a 0.5 inch storm. For Laguna Canyon Creek, pollutant loadings i-n runoff would include about 6.7 pounds of lead, 2.5 pounds of zinc, 629 pounds of filterable residues, 884 pounds of chemical oxygen demand, about 46 pounds of nitrogen, and up to 118 pounds of oi.l and grease. The ,project would not affect the Laguna Lakes be- 1 cause they are upstream of the proposed Corridor alignment. For E1 Toro Creek, runoff pollutant loads would include 3.2 pounds of lead, 1.1 pounds of zinc, 272 pounds of filterable residues, 377 pounds of chemical oxygen demand, 6.8 pounds of nitrogen and a maximum of 51 pounds of oil and grease. These inputs in the drainage basin would incrementally adversely affect water quality in these streams. As with other streams, initial runoff concentrations of these pollutants would be above the applicable standards. 8. Laurel Canyon Laurel Canyon is particularly rugged and the tributary flows southeast towards Laguna Canyon. Corridor alternatives would increase sedimentation in Laurel and Laguna Canyons, if not mitigated. Post -construction highway runoff would add about six pounds of lead, two pounds of zinc, 560 pounds of filter- able residues, 780 pounds of chemical oxygen demand, 14 pounds of nitrogen, and up to 92 pounds of oil and grease to this watershed. 9. Oso Creek Conventional Alternative. Oso Creek would be significantly impacted by a fill embankment which would force the realignment of the creek. Because the existing water quality of Oso Creek is presently poor (due to salinity, up- stream conditions and proximity to Camino Capistrano and I-5) realignment and channel improvements, whether riprap or concrete banks, are not viewed as long- term significant impacts. Short-term impacts would include some increased sedimentation and runoff into the Oso Creek Channel. The 7,000 foot Corridor alignment along Oso Creek would result in about 1.4 acre feet of runoff from the highway in the 0.5-inch storm. This runoff would include about four pounds of lead, 1.5 pounds of zinc, 395 pounds of filterable residues, 500 pounds of chemical oxygen demand, about 10 pounds of nitrogen, and up to 108 pounds of oil and grease. Demand Management Alternative. The Demand Management Alternative would bridge the existing, channelized portion of Oso Creek. The Creek and its surrounding floodplain/wetlands resources would not be subjected to long-term effects of sedimentation from Corridor runoff. Potential short-term impacts may occur, however, during project construction. Erosion control measures (refer to Section 4.2 of the EIR/EIS) and a Runoff Management Plan (discussed as mitigation in Section 4.3 of the EIR/EIS) will be implemented as part of the project to reduce water quality impacts during construction and throughout the life of the project. 10. Sulfur Creek Approximately 3,000 feet of the Corridor would cross the Sulfur Creek drainage. This Creek has been fully undergrounded in concrete conduits as part of the residential and commercial development in the vicinity of the Corridor. The project would input about 0.6 acre-feet of runoff into this stream during a 0.5-inch storm. This runoff would carry about two pounds of lead, 0.4 pounds of zinc, 170 pounds of filterable residues, 215 pounds of chemical oxygen demand, four pounds of nitrogen, and up to 92 pounds of oil and grease. Unmit- D Lill f fl 1 1 1 1 1 1 I igated, these pollutants would incremental) add to degradation' of this p Y g h� stream's water quality; however, they would not, in themselves, be significant. Analysis of Potential Impacts to Beneficial Uses The following addresses the potential impacts of the Corridor to benefi- cial uses of water resources within the project area as defined by the Santa Ana and San Diego Regions of the California Regional Water Quality Control ' Board (RWQCB). The proposed project alignment lies within both RWQCB regions. The Laurel Canyon, Laguna Canyon, E1 Toro, Wood Canyon, Aliso Creek, Sulfur and Oso Creek watersheds contained within the San Diego Region. San Diego Creek, Bonita Canyon, Coyote Canyon and Bommer Canyon Watersheds lie within the Santa Ana Region. As defined in the Water Quality Control Plans for the Santa Ana and San ' Diego regions,' beneficial uses include the ways in which water can be used by people and aquatic wildlife or for their overall benefit. Section 303 of the Clean Water Act (PL 92-500, as amended) defines water quality standards as both the uses of the (navigable) waters and the water quality criteria applied to protect those uses. For the project watershed drainage areas, beneficial uses- have been identified by the RWQCB. Not all of the individual project drainage areas are listed in the Water Quality Control Plans; however, the Plans state that the tributary drainages have the same beneficial uses as the listed streams and water facilities. The following beneficial uses have been identified for the project local drainages. Oso Creek. Oso Creek is within the San Juan Hydrographic Subunit. This subunit is designated to have beneficial uses of industrial service supply, wildlife habitat and preservation of rare and endangered species. Laguna Subunit. (Includes Laurel, Upper Laguna, E1 Toro, Wood Canyons, Aliso and North Sulfur Creeks). In the Corridor Area of Effect, these drainage areas have designated beneficial uses of wildlife habitat and preservation of rare and endangered species. San Diego Creek2, Bonita, Bommer and Coyote Creeks. San Diego Creek has beneficial uses of groundwater recharge, non -contact recreation, and wildlife habitat. The tributary creeks, Bonita, Bommer and Coyote, have the same uses except warm freshwater habitat. These uses are considered intermittent (the use is not year round as these water resources typically dry up for part of the year) . Comprehensive Water'Quality Control Plan Resort San Diego Basin (9), State Water Resources Control. Baord, Regional Water Quality Control Board San Diego Region, 1975, and Water- Quality Control Plan, Santa Ana River Basin (8), California Regional Water Quality Control Board, Santa Ana Region, 1984. 2 Below Jeffrey Road 9 Upper Newport Bay. Beneficial uses of Upper Newport Bay include contact and non -contact recreation, Areas of Special Biological Significance, wildlife habitat and preservation of rare and endangered species. The definitions of these beneficial uses are as follows: • AGR (Agricultural supply) - Includes crop, orchard and pasture irri- gation, stock watering, support of vegetation for range grazing and all uses in support of farming and ranching operations. • ASBS (Areas of Special Biological Significance) - Areas of special biological significance are those areas designated by the State Water Resources Control Board as requiring protection of species or biolog- ical communities to the extent that alteration of natural water qual- ity is undesirable. • COMM (Ocean Commercial and Sport Fishing) - The commercial collection of various types of fish and shellfish, including those taken for bait purposes, and sport fishing in ocean, bays, estuaries and sim- ilar non -freshwater areas. • GWR (Groundwater Recharge) - Natural or artificial recharge for fu- ture extraction for beneficial uses and to maintain salt balance or halt saltwater intrusion into freshwater aquifers. • IND (Industrial Service Supply) - Includes uses which do not depend primarily on water quality such as mining, cooling water supply, hydraulic conveyance, gravel washing, fire protection and oil well repressurization. • MAR (Marine Habitat) - Provides for the preservation of the marine ecosystem including the propagation and sustenance of fish, shell- fish, marine mammals, waterfowl and vegetation such as kelp. • RARE (Preservation of Rare and Endangered Species) - Provides an aquatic habitat necessary, at least in part, for the survival of cer- tain species established as being rare and endangered species. • REC-1 (Water Contact Recreation) - Includes all recreational uses involving actual body contact with water, such as swimming, wading waterskiing, skin diving, surfing, sport fishing, uses in therapeutic spas, and other uses where ingestion of water is reasonably possible. • REC-2 (Non -Contact Water Recreation) - Recreational uses which in- volve the presence of water but do not require contact with water, such as picnicking, sunbathing, hiking, beachcombing, camping, plea- sure boating, tidepool and marine life study, hunting and aesthetic enjoyment in conjunction with the above activities as well as sight- seeing. 10 C 1 Ll 11 1 • SHELL (.Shellfish Harvesting) - The collection of shellfish such as clams, oysters, abalone, shrimp, crab.and lobster for either commer- cial or sport purposes. • WARM (Warm Freshwater Habitat) - Provides a warm, water habitat to sustain aquatic resources associated with warmwater environment. • WILD (Wildlife Habitat) - Provides water supply and vegetative habi- tat for maintenance of wildlife. Water Quality Criteria/Objectives The RWQCB Water Quality Control Plans provide water quality criteria for the beneficial uses. Table B of this text lists the applicable standards for each of the pollutants included in this analysis. Quantified and written ' objectives for water quality are also provided in the Water Quality Control Plans. Water quality criteria for total filterable residue (FR) Inorganic Nitrogen (TKN) and Chemical Oxygen Demand (COD) are given -below. Objective levels for trace constituents (chemicals including lead, zinc) are given for municipal use waters and Reaches 2 and 3 of the Santa Ana River. None of the project drainages have a municipal use designation 'and the Santa Ana,:River tributaries are not within the project watershed. rMg/1 FR Inoro. Nit. COD San Diego Creek (below Jeffrey) 1500 13 90 Laguna (and tributaries) 720 -- -- ' Oil and Grease Waters shall not contain oil, grease, wax or other materials in concentra- tions which result in a visible film or in coating objects in the water, or which cause a nuisance or otherwise affect beneficial uses. The water quality threshold level criteri-a for benefici-al uses as con- tained in Table 4-4 of the San Diego Region Water Quality Control Plan indicate standards per the specific beneficial uses. Criteria are provided for lead, zinc and oil and grease: Oil. and Grease: 0 mg/l is permitted for REC-1, REC-2, WARM, WILD, COMM, MAR, SHELL uses; those designations pertain to all of the project drainages. Lead: 0.01 mg/l for WARM, WILD, COMM, MAR, SHELL .uses in all project drainage areas. Zinc. 0.02 mg/l for WARM, WILD, COMM, MAR, SHELL for all project drainage areas. 11 Comparison of the RWQCB criteria for the threshold levels of pollutants with the estimated pollutant loadings and oil and grease into project area drainages indicates that, for lead and zinc, pollutant loadings from Corridor runoff will exceed the threshold levels (refer to Table B). For filterable residues (FR) and nitrogen, the projected quantities for the project are within threshold levels; however, project estimates for chemi- cal oxygen demand (COD) exceed the threshold levels. It is noted that the applicable standards utilized in the Kerri analysis (EPA and RWQCB) vary sub- stantially from the threshold levels given in the 1975 RWQCB Plan Report, particularly for filterable residues, nitrogen and chemical oxygen demand. Impacts to Beneficial Uses For the drainage courses affecte MITIGATION MEASURES 1 1 1 1 d The following mitigation measure is designed to prevent concentrations of pollutants and oil and grease from the highway from entering downstream water courses and Upper Newport Bay. Implementation of this measure will reduce this potential impact to be within the levels of criteria established by the RWQCB Water Quality Plans. Thus, the beneficial hydrological uses of these water resource would not be significantly affected by pollutant loadings into runoff from the proposed Corridor. Measures listed for erosion control (Section 4.18 of the EIR/EIS) and floodplain impacts (Section 4.3 of the EIR/EIS) also apply to water quality impacts. In addition to those measures, the following mitigation measure will be implemented in order to minimize impacts to existing surface water resourc- es. Full implementation of this measure will reduce project impacts below a level of significance. 1. Prior to implementation of the project plans, a plan for runoff management will be submitted for approval to the Manager Flood Pro- gram Division, OCEMA. The plan will include facilities required to route and detain runoff for the purpose of reducing pollutant levels in downstream drainages to below a level of significance in accor- dance with Regional Water Quality Control Board Standards. This plan will address state of the art techniques, and will examine alterna- tive methods of achieving this mitigation, to ensure that all feasi- ble methods are incorporated into the project. The Plan will review for inclusion Best Management Practices (BMPs) for mitigation of water quality impacts. BMPs which could potentially be incorporated into the project design may include, but would not be limited to, extended detention ponds, retention ponds (basins), infiltration basins, infiltration trench designs, multi -chambered water quality inlets to stormdrains and landscaping filter strips. 12 :l F 1 'J Criteria to be considered for inclusion in the runoff management plan 9 include, but are not limited to the following: A. After construction, project runoff shall, be routed through detention/settlement basins and grass covered drainage courses. The detention/settlement basins will be sized to retain runoff from the peak flow in the 25-year storm, and meter the runoff to the grass areas so as not to overload their treatment capaci- ties. The grass areas may vary in size. Species of grasses will be selected as appropriate for the Southern California climate. Location and sizing of the basins will be determined as part of the final design. B. Wherever feasible, vegetation in Corridor project drainage chan- nels will be protected in place rather than removed. Drainage channels will be located and sized with this consideration in ' mind. C. Detention basins will be equipped with oil and: grease traps wherever physically feasible. These traps will be cleaned regu- larly or as required by the capacity of the trap. D. Runoff from the roadway will be directed to overland flow where feasible to promote water percolation and removal of metals. E. Shallow water ponding of low flow runoff in aerobic maintained ditches will be implemented wherever topography permits to increase petroleum (hydrocarbon) degradation. F. Planting of appropriate leguminous plants will be included in roadside revegetation plans where feasible to provide nitrogen which is needed to break down petroleum. 1 1 1 13 1 F CITY OF NEWPORT BEACH 1 PLANNING DEPARTMENT 3300 NEWPORT .BOULEVARD P.O. BOX 1768 NEWPORT BEACH, CALIFORNIA 92659-1768 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR . DRAFT ENVIRONMENTAL IMPACT REPORT/ ENVIRONMENTAL IMPACT STATEMENT ' TECHNICAL REPORT NO. 3 AIR QUALITY STUDY I t 1 E I I 1 11 fl SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR INTERSTATE 5 TO JAMBOREE ROAD AIR QUALITY TECHNICAL REPORT Prepared for: The Transportation Corridor Agencies 345 Clinton Street Costa Mesa, California 92626-6011 Prepared by: CORRIDOR DESIGN MANAGEMENT GROUP 345 Clinton Street Costa Mesa, California 92626-6011 714/557-0330 July 1990 1 1 1 1 1 1 1 1 1 f 1 1 1 1 1 1 TABLE OF CONTENTS 1.0 INTRODUCTION 2.0 CLIMATE AND METEOROLOGY 3.0 AMBIENT AIR QUALITY STANDARDS (AAQS) 4.0 EXISTING AIR QUALITY 5.0 CONFORMITY WITH SOUTH COAST AIR QUALITY MANAGEMENT PLAN 6.0 REGIONAL AIR QUALITY ANALYSIS 7.0 CARBON MONOXIDE (CO) MICROSCALE ANALYSIS 8.0 PREDICTED CO LEVELS 9'.0 MITIGATION MEASURES 10.0 PARK AND RIDE 11.0 HEALTH RISKS 12.0 COMPARISON OF TOLL AND TOLL FREE OPERATIONS 13.0 CONSTRUCTION ACTIVITY IMPACTS APPENDIX A - EMFAC7PC AND CALINE4 MODEL SAMPLE RESULTS APPENDIX B - PARK AND RIDE SAMPLE RESULTS PAGE 1 1 2 4 6 13 14 18 18 18 22 22 24 1 1 1 i I i 1 1 1 1 1 1 1 1 1 1 LIST OF TABLES Table 1 FEDERAL AND CALIFORNIA AMBIENT AIR QUALITY STANDARDS 3 Table 2 ORANGE COUNTY AMBIENT AIR QUALITY MONITORING SUMMARY 5 Table 3 DIRECT TRAVEL IMPACT MODEL (DTIM) COMPARISON OF BUILD AND NO BUILD ALTERNATIVES 12 Table 4 VARIABLES USED TO DETERMINE VEHICULAR EMISSION FACTORS 17 Table 5 1995 PREDICTED CARBON MONOXIDE (CO) LEVELS - INITIAL OPERATIONS 19 Table 6 2010 PREDICTED CARBON MONOXIDE (CO) LEVELS - CONVENTIONAL OPERATIONS 20 Table 7 2010 PREDICTED CARBON MONOXIDE (CO) LEVELS - DEMAND MANAGEMENT OPERATIONS 21 Table 8 EFFECTS OF CARBON MONOXIDE 23 Table 9 COMPARISON OF TOLL AND TOLL FREE OPERATIONS - CO LEVELS 25 0 t 1 t 1 1 1 1 1 1 1 1 1 1 1 1 1 LIST OF FIGURES Figure 1 Project Location Figure 2 SCAQMD Air Monitoring Network Figure 3 Regional Air Quality Analysis Area Figure 4 Air Quality Receptor Sites Figure 5 Park and Ride Locations Following Page 1 4 14 1-5 21 1.0 INTRODUCTION The San Joaquin Hills Transportation Corridor (SJHTC) is the proposed extension of the SR-73 Freeway from the I-5 Freeway in the City of San Juan Capistrano to Jamboree Road in the City of Newport Beach. The Corridor also passes through the cities of Irvine, Newport Beach, Laguna Beach, Laguna Niguel, Mission Viejo, San Juan Capistrano, and unincorporated areas of Orange County (Figure 1). The Corridor is part of the South Coast Air Basin located in the southwestern portion of Orange County. The proposed project consists of two alternatives: the Demand Manage- ment Alternative and the Conventional Alternative. Both alternatives would follow the same alignment, extending State Route 73 from Interstate 5 in San Juan Capistrano to Jamboree Road in Newport Beach. Both alternatives will have HOV lanes. The Demand Management Alternative would provide three general purpose lanes in each direction, two reversible HOV lanes, a toll system, and reservation of an 88-foot median for additional capacity, as warranted. The Conventional Alternative would provide four to five general purpose lanes in each direction, one HOV lane in each direction, a toll system, and reservation of a 64-foot median for future expansion. The construction of the Corridor would be phased with initial construction of three mixed flow lanes -and all toll facilities expected to be completed by 1995. The proposed system for collection of tolls is a closed barrier system, which includes one mainline barrier toll plaza near the center of the facili- ty, and 12 ramp toll plazas located on only one side of certain interchanges. The mainline barrier and general purpose interchange ramp toll -plazas will include a combination of manual and Automatic Vehicle Identification ' (AVI) collection systems. The reversible HOV lanes will utilize AVI collec- tion systems exclusively. The AVI Toll Collection System would read active or passive transponders located in vehicles at speeds of up to 100 mph with 99.9% of read accuracy. The SJHTC will be operated as a toll system until the Bonds (used to finance construction) are retired, at which time it would be converted to a freeway. The air quality analyses are based on toll -free traffic projections with toll plazas in -place. Section 12.0 -of this report discusses toll vs. toll -free operations. 2_0 CLIMATE AND METEOROLOGY Orange County's climate is governed by the strength and location of the semipermanent high pressure center over the Pacific Ocean and the moderating effects of the nearby oceanic heat reservoir. The local climate is character- ized by warm summers, mild winters, infrequent rainfall, moderate daytime onshore breezes and comfortable humidities. The SJHTC project area experi- ences an average of approximately 12.85 inches of rainfall a year. The prevailing summer daytime winds in the area are from the southwest at eight to twelve miles per hour. On summer nights. the pattern reverses with wind coming from the northeast at four to five miles per hour.- In the winter months, daytime ocean nighttime winds are three winds come in at seven to nine to eight miles per hour. The miles per hour and net effect of the 1 Los Angeles Co. San Bernardino Co. 57 -� Riverside Co. J EASTERN 55 J.�. TRANSPORTATION CORRIDOR Cleveland us n �,• '`e '.� National s j � / usMc Forest El Toro � `� • �•• Freeway ` _____ i FOOTHILL TRANSPORTATION CORRIDOR SAN JOAOUIN HILLS .`'�' TRANSPORTATION. CORRID:) :::«'::i::� • i� 74 0 1 23 a S 6 7 •,�. , Orange County • San Diego Co. • 1000, PROJECT LOCATION FIGURE 1 prevailing wind patterns is that locally generated air pollutants are rapidly Y pushed eastward toward Riverside County by day and slowly drift back seaward at night. The onshore flow and the offshore nocturnal flow keep much of southern Orange County well ventilated. There are occasional dry easterly winds (Santa Ana winds) in the region. These winds usually occur for a two to three day period during the autumn months. In addition to winds that govern the horizontal rate and path of move- ment of any air pollutants, Southern California experiences several character- istic types of temperature inversions that control the vertical depth through which pollutants can be mixed. The daytime onshore flow of marine air is capped by a massive dome of warm air that acts like a giant lid over the basin. As the clean ocean air moves inland, pollutants are continually added from below without any dilution from above. As this layer undergoes photo- chemical transformations under bright sunlight, ozone and other secondary pollutants are created. A second inversion forms at night as cool air pools in low elevations while the .air aloft remains warm. Shallow radiation inversions are formed (especially in winter) that trap pollutants near the ground and form high localized concentrations of pollutants (principally nitrogen dioxide and carbon monoxide). Although inversions are found during all seasons of the year, the regional capping inversion is far more prevalent in summer, while the localized radiation inversions are strongest in -winter. The strong sea- sonal split in inversion intensity thus contributes in an important way to the completely different air quality between summer and winter in Southern Cali- fornia. 3_0 AMBIENT AIR QUALITY STANDARDS (AAQS) ' In order to determine the effect on the _environment, the air quality impacts of a proposed development such as the San Joaquin Hills Transportation Corridor are compared with the applicable ambient air quality standards. These standards are the levels of air quality considered safe, with an ade- quate margin of safety, to protect the public health and welfare. They are designed to protect that segment of the public most susceptible to respiratory distress or infection. Healthy adults can tolerate periodic exposure to air pollution levels well above these standards before_ adverse health effects are observed. The Federal Clean Air Act of 1970 originally established National Ambi- ent Air Quality Standards (NAAQS) with each state retaining the option to adopt more stringent standards or to include other pollution "species. Because California already had standards in existence before federal NAAQS were estab- lished and because of unique meteorological problems in the state, there is considerable diversity between California. The federal and state and federal standards currently in effect California standards currently in effect are shown in Table 1. Table 1 FEDERAL AND CALIFORNIA AMBIENT AIR QUALITY STANDARDS Federal Air Pollutant California Primary Secondary Ozone 0.10 ppm,l-hr.avg. 0.12 ppm,l-hr.avg. 0.12 ppm,l-hr.avg. Carbon Monoxide 9 ppm,8-hr.avg. 20 ppm,l-hr.avg. Nitrogen Dioxide 0.25 ppm,l-hr.avg 9 ppm,8-hr.avg. 9 ppm,8-hr.avg. 35 ppm,l-hr.avg. 35 ppm,l-hr.avg. 0.053 ppm,ann.avg. 0.053 ppm,ann.avg Suspended Particulate Matter (PM-10) 30 ug/m3 annual 50 ug/m3 annual 50 ug/m3 annual geometric mean arithmetic mean arithmetic mean 50 ug/m3 24-hr.avg. 150 ug/m3 24-hr.avg. 150 ug/m3 24-hr.avg. Lead 1.5 ug/m3 30-day avg. 1.5 ug/m3 calendar 1.5 ug/m3 calendar quarter quarter Visibility Reducing Particles In sufficient amount to reduce the prevailing visibility to less than 10 miles at relative humidity less than 70 percent, 1 obs. ppm - parts per million by volume ug/m3 - micrograms per cubic meter 3 L� 4.0 EXISTING AIR QUALITY _ O LITY 4.1 Ambient Air Quality Local ambient air quality is monitored by the South Coast Air Quality Management District ('SCAQMD) at several locations in Orange County (Figure 2). Air quality data measured at the E1 Toro and Costa Mesa stations are the closest monitoring stations to the SJHTC. The maximum observed concentrations measured at each station are summarized in Table 2. Along with the maximum observed concentrations are the number of days during 1987, 1988, and 1989, that each of the air quality standards was exceeded. The monitoring data is summarized below: o Ozone levels exceeded both federal and state standards by a wide margin, generally two times higher than allowable during the single one hour highest concentrations in each of the three years. o Carbon monoxide levels, which have been subject to increasingly stringent automobile emission controls, still exceed the state's eight hour standard. o Dust (particulate) levels periodically exceed the State standard, but not the national particulate standard. o Lead levels dramatically demonstrate the effects of eliminating lead from gasoline. Maximum monthly lead concentrations have dropped, despite a significant increase in traffic in southeastern Orange County. No violations of the lead standard were recorded. 4.2 Background Carbon Monoxide Levels Studies show that CO levels increase during the months close to or in the winter season. Low temperatures during the winter season promote higher CO emissions from vehicle engines. Stagnant atmospheric dynamics reduce pollutant dispersion, further increasing pollutant concentrations. Therefore, the chance of recording the maximum CO level is higher during the winter months. The probability of recording seasonal maximums during calendar months of the year and during' different weekdays is described in CALTRANS Report No. FHWA/CA/TL 84/01 "Measurements and Analysis of Ambient Carbon Monoxide Concen- trations for Project -Level Air Quality Impact Studies." The report describes a statistical model that evaluates scheduling and duration of sampling as a means to minimize bias in estimating the second annual maximum CO concentra- tions. The OBSMAX computer program, described in the above -mentioned report, implements the statistical model to estimate the second annual maximum CO concentrations and to identify anomalous measurements. Following the procedure discussed in the Air Quality Technical Analysis Notes (AQTAN) produced by Office of Transportation Laboratory, the CO levels were monitored by Caltrans between 11/13/89 and 1/12/90 at the Irvine Company property at the corner of Bonita Canyon Road and Sunnyhill in the City of Irvine as follows: LANCASTER • ianumnuuuuanuu NEWHALL tat RESEDA • GLENDORA ) BURBANK • • PASADENA • AZUSA 1UPLANC • �• LOS ANGELES POMO WEST S ANGELES -- • WHITTIER -=2 PICO RIVERA • j� - HAWTHORNE • ; LA HABRA LYNWOOD r�J LONG BEACH ; • • ANAHEIM LOS ALAMITOS COSTA MESA Legend tttaaa SOUTH COAST AIR BASIN • 1 • N ONTARIO AIR MONITORING STATION INDICATIVE •� OF PROJECT AREA AIR QUALITY aatatattttaattttataataaattttttttatatIII Iattalso t". CRESTLIN E SAN BERNADINO • RED.ANDS FONTANA Lanaartu t t7•--------- RUBIDOUX• NORCO RIVERSIDE. -� nuutunnuu= PERRIS HEMET tttaat= .—.1 • • :tat • i' ity EL TORO t ant: �'ltaatt�� as ' ra � inuntuuatuntutntnnuuaane Source: AQMD 11 *a MENNEN ME SCAQMD AIR MONITORING NETWORK FIGURE 2 Table 2 ORANGE COUNTY AMBIENT AIR -QUALITY MONITORING SUMMARY Pollutant and State/ Federal Standards 1987 Costa Mesa 1988 1989 El Toro 1987 1988 1989 Ozone (03) Fed.8td.> .12 ppm,l-hr.[1] 2 2 0 16 18 7 St.Std.> .09 ppm.l-hr.[l] 23 15 2 36 41 30 Max. 1-hr. cone. (ppm) .16 .15 .11 .20 .21 .23 Carbon Monoxide (CO) Fed.Std.> 9.5 ppm,8-hr.*[l] 0 2 5 0 0 0 Fed.Std.> 35 ppm.1-hr.[1] St.Std.> 9.1 ppm,8-hr.*[1] 0 0 0 3 0 8 0 0 0 0 0 0 St.Std.> 20 ppm.l-hr. 0 0 0 0 0 0 Max. 1-hr. cone. (ppm) 12 16 16 8 10 9 Max. 8-hr. cone. (ppm) 0 8 12.7 0 6 5.1 Nitrogen Dioxide (NO2) St.Std.> .25 ppm.l-hr.[l] Max. 1-hr. cone. (ppm) 0 .19 1 .26 0 .22 NM NM NM NM NM' NM Particulates (TSP Fed.Std.>260 ug/m ,24-hr. NM,, NM NM 0/60** 0/59** NA/61 St.Std.> 100 ug/m3,24-h NM NM NM 5/60**17/59** NA/61 Max. 24-hr. cone. (ug/m ) NM NM NM 150 -156 208, Lead (Pb) Fed.Std. 1.5 ug/m3,3-mo. NM NM NM 0 0 NM St.Std. 1.5-ug/T3,1-mo. Max. cone. (ug/m ) NM NM NM NM NM NM 0 0 -- -- NM NM Inhalable Particulates '(PM O) St.Std. 24-hour > 50 ug/m3 NM NM NM 15/61**11/61** 20/60 Fed.Std. 24-hour >150 ug/3m NM NM NM 0/61** 0/61** 0/60 Max. 24-hour cone. (ug/m ) NM NM NM 107 97 88 ppm - Parts by volume per million parts of air. NM - Pollutant not monitored. ug/m3 - Micrograms per cubic meter of air. * - Both State and federal eight hour standards are 9 ppm. ** - Samples exceeded/samples taken. [1] - Number of days exceeded. NA - Data not available. Source: South Coast Air Quality Management District, E1 Monte, 1988, 1989, and 1990. 5 11/13/89 - 11/17/89 Tuesday through Friday continuously. 11/27/89 - 12/22/89 Tuesday through Friday continuously. 01/08/90 - 01/12/90 Tuesday through Friday continuously. Samples were collected by an automated 24-hour bag sampling device known as air quality sampler II. Air sample bags were then picked up the next day and brought to Caltrans District 12 Lab for analyzing by the DASIBI Model 3008. CO concentrations measured from hourly bag samples were input to the OBSMAX computer program which estimates second maximum 1-hour and 8-hour background CO concentrations. The following tables shows the summary of the results: Time Period CO Level 1 hour 8 ppm 8 hour 3.4 ppm The measured background CO levels are used to determine the microscale CO concentration at receptor locations along the Corridor. 5_0 CONFORMITY WITH SOUTH COAST AIR QUALITY MANAGEMENT PLAN Under the 1970 Amendments to the federal Clean Air Act, the Environmen- tal Protection Agency (EPA) has established National Ambient Air Quality Standards (NAAQS) for air pollutants that might endanger public health or welfare. California has similarly established ambient air quality standards under the California Clean Air Act. States are required to prepare plans (by region) designed to achieve these ambient air quality standards. Under provisions of the federal Clean Air Act, no federal agency or metropolitan planning organization may approve or support any transportation project which does not conform to an approved State Implementation Plan. Likewise, under regulations promulgated pursuant to the California Clean Air Act, a metropolitan planning organization must certify that the transportation projects it approves are in conformity with the State Implementation Plan. In the South Coast Air Basin, the Southern California Association of Governments (SCAG) is the metropolitan planning organization. Currently, the 1979 Air Quality Management Plan for the South Coast Air Basin is the only approved State Implementation Plan for the South Coast Air Basin. However, the Cali- fornia Air Resources Board has recently adopted the 1989 Air Quality Manage- ment Plan (1989 AQMP) for the South Coast Air Basin and will be submitting the 1989 AQMP to EPA for approval as the State Implementation Plan for this re- gion. Therefore, this Section will discuss the conformity of the project with both the 1979 State Implementation Plan (1979 SIP) and the 1989 AQMP. Status of the 1979 SIP The 1979 Amendments to the Clean Air Act State Implementation Plans (SIP) providing for and enforcement of the NAAQS. Primary NAAQS within three years of the approval of the SIP. amended again to allow "non -attainment" areas t required the states to submit the implementation, maintenance standards were to be attained In 1977, the Clean Air Act was o apply for time extensions for 0 attaining primary NAAQS standards; with the new deadline. set for'.December 31 1982. In areas where it was not possible to meet the 1982 deadline for carbon monoxide or ozone, a deadline of December 31, 1987, was established. In 1978, EPA designated the South Coast Air Basin (SCAB) as a non -at- tainment area for carbon monoxide and ozone. A year later, EPA imposed a construction moratorium on all non -attainment areas in the country, including SCAB. The construction ban was lifted in 1982, following EPA approval of a. revised SIP for the SCAB. California also requested, and received, an extension''for attainment of carbon monoxide and ozone NAAQS until December- 3.1, 1987. In 1982, revisions to the SIP regarding carbon monoxide and ozone standards were submitted to EPA (1982 AQMP). EPA approval of the control measures contained in these, revi- sions was invalidated in Abramowitz v.4 U.S. E..P.A. (9'th 'Cir. 187), 832 F. � 2d 1071. EPA took final action to disapprove the 1982 AQMP for the South Coast Air Basin on January 22., 1988. The disapproval was effective on February 22, 1988 (53 Fed. Reg. 1781 [January 22, 1988]). EPA "requires that all control measures adopted as part of previous EPA - approved SIP revisions remain in effect while the area -is violating the NAAQS and until such time as the measures are modified in accordance with estab- lished SIP revision procedures" (52 Fed. Reg. 457089 [November 24, 1987]). Therefore, the control measures for carbon monoxide and ozone contained in the 1979 SIP remain in effect following the disapproval of the 1982 SIP revisions. Conformity with the 1979 SIP - The 1979, SIP for the SCAB includes emissions projections which rely, in part, on the SCAG 1918 Growth Forecast. This EIR/EIS does not use the emis- sions or population projects contained in the 1910 SIP because they are obso- lete. The 1979 SIP also includes transportation control measures (TCM) intend- ed to reduce emissions. The TCM, which remains in effect following the disap- proval of the 1982 AQMP, include the following: 1. Modified work schedules; 2. Carpool preferential parking; 3. Trip reduction program; 4. Increased bicycle/pedestrian facilities; 5. Employees ridesharing program; 6. Traffic signal synchronization; 7. Freeway facility changes supporting high occupancy vehicles; 8. Congestion relief - freeway widenings; 9. Carpool.sign=ups for government employees; 10. Santa Ana Transportation Corridor; and 11. Reduce non -recurrent congestion. (Source: 1979 SIP, pp. I-23 - 1-25.) The project is consistent with the 1979 SIP because it will help to implement several of these transportation control measures, including the support of high occupancy vehicles, employee ridesharing programs, non-recur- rent congestion reduction and congestion relief. It will not preclude the adoption of any of the other measures. Because either of the design alterna- tives will result in a reduction of emissions over the No Project Alternative, the project will result in progress in attaining the federal and state ambient air quality standards. The project, as presently planned, was not included in the 1987 Regional Transportation Plan incorporated in the 1979 SIP. In light of the obsoles- cence of the data contained in the 1979 SIP, however its most important opera- tive provision if the establishment of TCM. The project is consistent with this element of the 1979 SIP. Status of the 1989 SIP SCAG and the South Coast Air Quality Management District (SCAQMD) have prepared and approved a new air quality plan for the SCAB. The 1989 AQMP has been improved by the California Air Resources Board (August 15, 1989) and will be submitted (in part, along with other materials) to the EPA for approval as a portion of a revised SIP. The 1989 AQMP includes the Regional Mobility Plan, a transportation planning document which sets forth various transporta- tion planning document which sets forth various transportation measures to be implemented over the 20-year planning horizon of the 1989 AQMP, and also includes the Growth Management Plan, the regional planning document setting forth forecasts and policies for growth management during the same planning horizon. The growth forecasts and policies of the Growth Management Plan were used in the formulation of the preferred strategy in the Regional Mobility Plan and in the 1989 AQMP. The 1989 AQMP incorporates all of the mobility improvement measures of the Regional Mobility Plan place emphasis on demand management measures to reduce vehicle trips and vehicle miles, incorporating the minimum new facilities needed to attain mobility goals and thereby achieve air quality goals. The preferred strategy of: the Regional Mobility Plan supports and implements the jobs/housing balance policy of the Growth Manage- ment Plan. Conformity with the 1989 AOMP - Federal Approvals Under regulations promulgated by the Federal Highway Administration, a transportation project is in conformity with the SIP if that project is a transportation control measure (TCM) from the SIP. Since the project is part of the SCAG-prepared Regional Mobility Plan, the highway improvement portion of which is a TCM from the 1989 AQMP, the project is in conformity with the 1989 AQMP under Federal Highway Administration regulations. EPA has issued an Advanced Notice of Proposed Rulemaking (53 F.R. 49494, December 7, 1988) which specifies that each project to be approved by SCAG or a federal agency will have to satisfy conformity review criteria to be speci- fied in the 1989 AQMP. If EPA believes the 1989 AQMP conformity procedures are inadequate, the EPA will remedy those inadequacies in the Federal Imple- mentation Plan for the SCAB, which it must prepare as a result of Abramowitz v. U.S. E.P.A. The Federal Implementation Plan for the SCAB has not been prepared as yet. E I 1 1 1 Conformity with the 1989 AQMP - Local Approvals Beyond, its status as part of a transportation control measure in the 1989 AQMP, the project provides other significant support for the air quality goals and policies of the 1989 AQMP. The project is designated in the Regional Mobility Plan., a part of the 1989 AQMP, as an element of the "constrained funding"' program of highway improvements. This program of improvements, along with transportation. demand management measures, transportation systems management, and .the jobs/housing balance measures of the Growth Management Plan, is an essential component of the 1989 AQMP. The 1989 AQMP is -designed to provide for management of SCAB growth over the next 20 years, and for the attainment of NAAQS and recapture of 1984 mobility levels. Further, the project implements several of the air quality policies called for in the Regional Mobility Plan: 1. As part of the Orange County Master Plan of Arterial Highways (MPAH) since 1979, and as part of the link between the land use and circulation elements of the Orange County General Plan, the project is coordinated with land use decisions for Orange County. 2. The project incorporates several advanced system technologies, including automatic vehicle counts. automatic vehicle_ identifica- tion, variable message signing, video surveillance, an incident management plan and ramp metering. 3.- The project provides for HOV lanes and Park -and -Ride lots which will form part of the SCAB HOV network necessary to implement and support ridesharing, van pooling and other vehicle occupancy measures called for in the 1989 AQMP and mandated by the Califor- nia Clean Air Act of 1988. 4. The Transportation Demand Management policy of the Regional Mobil- ity Plan and the 1989 AQMP is supported by the Demand Management Alternative and by the toll road aspect of the project, which can encourage ridesharing and reduce vehicle trips through economic incentives. 5. The transit function of the project, specified in the Regional Mobility Plan as part of the "unconstrained funding" program of facilities improvements ("medium capacity on HOV lane"), is prov- ided for by the HOV lanes of the project and the Park -and -Ride lots. Rail transit opportunities are preserved by the inclusion. of median space within the project to accommodate such facilities in the future. 6. The project responds to the mandate in the 1989' AQMP for more efficiency in transportation infrastructure and improving traffic flow by alleviating congestion on existing parallel freeways and arterials, and through implementation of the Demand Management Alternative. 1 0' 7. The project supports implementation of the subregional jobs/hous- ing balance goals of the Growth Management Plan (a part of the 1989 AQMP) by providing necessary transportation infrastructure allowing efficient linkage of housing and employment centers within the Southeastern Orange Count Subregion, thereby reducing commuting incentives between subregions. SCAG-Approved Conformity Guidelines under the 1989 AQMP Under the 1989 AQMP Conformity Procedures, projects to be included in the out -years (years 3-7) of the Regional Transportation Improvement Program (RTIP) are in conformity with the 1989 AQMP if they are included in the Re- gional Mobility Plan. For projects to be included in the Biennial Element of the RTIP, their environmental documents must demonstrate that: the project is phased, sized and located according to the patterns and magnitude of growth shown in the Growth Management Plan; air quality impacts are analyzed on a Corridor level; comparison of air quality impacts of all alternatives is presented on a Corridor level; demand management strategies, HOV facilities and transit are analyzed alternatives or mitigation measures; and the project is consistent with the Regional Mobility Plan air quality policies. Each of these criteria is discussed below. Out -year Conformity The project is included in the Regional Mobility Plan, and therefore is in conformity for purposes of project inclusion in the out -years of the RTIP. Further, the project is part of the "constrained funding" facilities program of the Regional Mobility Plan and thus is consistent with the 1989 AQMP objec- tive to give priority in transportation programming to such facilities in the RTIP. Biennial Element Conformity Under the SCAG-approved conformity guidelines, a new transportation Corridor is "located and sized in accordance with the Growth Management Plan" if its general alignment is consistent with the alignment shown for such Corridor in the Regional Mobility Plan, and the Corridor consists of six mixed -flow and two HOV lanes. The project is consistent with its general alignment as shown in the Regional Mobility Plan, and under the Demand management Alternative consists of the three mixed -flow lanes in each direction and two HOV lanes are reversible -flow, maintaining size consistency with the Regional Mobility Plan while allowing more efficiency of operation and better accommodation of ride - sharing, van pooling and other HOV-inducing transportation control measures. Under the Conventional Operations Alternative, the project will require up to five mixed flow lanes in each direction in certain segments. This number of lanes (in addition to HOV and auxiliary lanes) is necessary to provide for satisfactory traffic operations. See Section 4.16.1. This con- figuration is larger than the Regional Mobility Plan configuration for the project (three mixed flow lanes and one HOV lane in each direction). Under the SCAG-approved Conformity Guidelines, transportation projects which differ from their size or location description in the Regional Mobility Plan must meet the conformity criteria specified for project -specific amendments to the Regional Mobility Plan. These criteria require that the project demonstrate 11 1 11 1 1 1-1 10 1 positive air quality impacts be consistent with the applicable le goals, policies and programs of the 1989 AQMP and not impede the implementation or effec- tiveness of the TCM's in the 1989 AQMP. The Conventional Operations Alterna- tive is in conformity with the 1989 AQMP insofar as facility size is concerned under these criteria because this alternative provides positive air quality benefits for the study area and the SCAB. (See Table 4A.A. ) Further, the Corridor size (under either the Conventional Operations or Demand Management Alternative) would remain the same if SCAG land use and population projections (from the Growth Management Plan) were used to forecast traffic data for the Corridor rather than the traffic forecast based upon O.C.P. 88. Other aspects of the conformity analysis for the Conventional Operations Alternative (includ- ing consistency with 1989 AQMP goals, policies programs and TCM's), are for the Demand Management Alternative, and are discussed below. The project is phased in accordance with the Growth Management Plan since the HOV lanes for the project will be constructed within the planning horizon of the 1989 AQMP, the year 2010. As described in Section 6.0 of this report, Regional Air Quality Analy- sis, the air quality impacts of the project have been analyzed on a "Corridor Level." The study area, shown on Figure 3, is, within the Southeastern Orange County Subregion, and was identified by traffic analysis as the area in which Corridor vehicle trips will be contained. Figure 3 defines the area in which the Corridor will have a direct effect on traffic and related air quality im- pacts. The results of these analyses demonstrate that the project has positive long run air quality impacts over the planning horizon of the 1989 AQMP. These results are summarized in Table 3. As required by the 1989 AQMP Conformity Procedures, demand management measures, HOV facilities and transit have all been analyzed as alternatives of mitigation measures. The Demand Management Alternative incorporates demand management techniques and transportation systems management (TSM) measures, as well as HOV facilities. The Conventional Operations Alternative incorporates HOV lanes and TSM measures. In addition, transit opportunities are provided in two forms. Rail transit opportunities are accommodated through retention of sufficient median space to allow phased development of rail transit in the future, and the HOV lanes and Park -and -Ride lots provide the necessary infra- structure for implementation of the Regional Mobility Plan designated transit function of the project (medium capacity transit,on HOV lane). The project is consistent with all applicable air quality policies of the Regional Mobility Plan. These policies include: joint land use and transpor- tation planning, advanced systems technology, transportation systems management techniques, HOV lanes, demand management programs /trans i t/r ide sharing, demand management for non -commute trips and advanced technology research testing and implementation. The facilities and functions of the project which support each of these policies are described above. The remaining air quality policies of the Regional Mobility Plan are inapplicable to, the project. Under the SCAG-approved conformity procedures and the 1989 AQMP Conform- ity Guidelines, the project is in conformity with the 1989 AQMP for purposes of SCAG and other local approvals. Including the project in the RTIP will comply with the requirement of the 1989 AQMP Conformity Procedures that the Tier 1 transportation measures (which include the project) be programmed for implemen- tation'by 1994. 11 Table 3 DIRECT TRAVEL IMPACT MODEL (DTIM) COMPARISON OF BUILD AND NO BUILD ALTERNATIVES (2010) Alternatives Percent Contaminant Emissions Conventional No Build Change (kilograms/year) CO 268,521 314,828 -14.7% NOX 16,664 17,090 -2.5% TOG 25,792 29,456 -12.4% PM 6,518 6,545 -0.4% Daily Fuel Used (Kilometer/gal) 1,242 1,374 -9.6% Average Travel Speed (mph) 29.7 21.7 +36.9% Vehicle Miles Traveled 30,393,335 30,202,505 +0.6% Vehicle - Minutes 61,467,437 83,347,219 -26.0% Miles per Gallon (mpg) 24.5 22.0 +11.0% .ant I I Demand Management Alternative 1 Although both the Demand Management and Conventional Operations Alterna- tives are in conformity with the 1989 AQMP, the Demand Management -Alternative provides a technologically advanced transportation facility uniquely incorpo- rating features which are of particular significance in pursuing the 1989 AQMP air quality goals for the SCAB. The Demand Management Alternative achieves efficiency in transportation by making maximum use of HOV-facilities, provid- ing fewer mixed use lanes than 'the Conventional Operations Alternative and thereby encouraging ridesharing and van pooling 'to a greater -"extent than conventional highway designs. See Section 4.16. The Demand Management Alter- native provides the highway facility counterpart to several other 199 AQMP transportation control measures, including ridesharing and van pooling- incen- tives, parking management and transit. The Demand Management Alternative provides a highway facility consistent with achieving the minimum 1.5 person vehicle occupancy requirement for the SCAB set forth in the California Clean Air Act of 1988 (Health & Safety Code Section 40920). Growth Management Plan The central focus of the Regional Growth Management Plan is the goal of improving the balance of job opportunities with housing opportunities within each subregion of the SCAB. The Southeastern Orange County Subregion current- ly (1984) has a jobs/housing balance ratio of 1.45 (number of jobs divided by number of housing units), and is forecast, under the Growth Management Plan preferred growth scenario, to remain at 1.45 in 2010. (Source: Growth Man- agement Plan supports the jobs/housing'balance goal for this Subregion by providing more efficient transportation between the employment centers and housing centers within the Subregion. 6_0 REGIONAL AIR QUALITY ANALYSIS Traffic projections for the Corridor were developed by Orange County Environmental Management Agency (OCEMA) using a focused version of their OCTAM model (SOCTAM). A detailed description of the OCTAM model, is provided in the document entitled Orange County Transportation Analysis Model, Model Descrip- tion and Validation Results, OCEMA Transportation Division, June 1986. This discussion provides an overview of the modeling 'process and reviews modifica- tions to the OCTAM network to develop SOCTAM. Travel demand estimation is an analytical process. that utilizes current land use, roadway network and trip generation and behavior information to develop a mathematical model of trip movements. The model is calibrated to existing trip levels and patterns by modifying basic input data and assump- tions for the base case to generate estimates of existing trip levels and patterns. Once calibrated, future land use estimates and network alternatives are evaluated through an iterative process. The basic procedure is one of trip generation, distribution and assign- 1 ment. Trip generation estimates are developed from land use data and known local trip generation levels; these trips are then distributed between Traffic Analysis Zones (TAZs) directly proportional to the intensity of land use in each zone pair and indirectly proportional to the distance between each zone pair. The existing roadway network is simulated and analyzed to determine 1 13 appropriate paths for each inter -zonal trip based on time and/or financial parameters. Trips are then assigned to the network based on minimum time and/or cost criteria. , The focused SOCTAM model used for developing travel projections on the Corridor was developed by modifying the county -wide OCTAM. For example, more detailed roadway network and land use data were included for the areas immedi- ately serviced by the Corridor. This "focusing" process strengthens the predictability of the model along the Corridor. Similar travel projection methodologies and assumptions were employed in both the OCTAM and SOCTAM models. The effects on regional air quality of the SJHTC project Corridor were determined for the year 2010 using a regional air emissions computer model, the Direct Travel Impact Model (DTIM), that considers changes in travel pat- terns, volumes, and speeds. The DTIM integrates the output from the Orange County Transportation Analysis Model focused in the Corridor subregion (SOC- TAM) for the region of Orange County shown in.Figure 3 with the latest Cali- fornia specific vehicular air pollution emission factor model (EMFAC7D). The model was run by Orange County Environmental Management Agency (OCEMA) Trans- portation Planning staff for the No Build case (with the Eastern Transporta- tion Corridor [ETC] and the Foothill Transportation Corridor [FTC]), and for the Conventional Alternative. The Conventional Alternative was modeled for eight lanes of mixed flow traffic with no HOV lanes. The SOCTAM does not consider HOV lanes: therefore, the Demand Management Alternative could not be modeled and used for DTIM to assess the regional air quality impacts. The results of the regional analysis (Table 3) indicate that the SJHTC operations, as compared to the No Build Alternative, will result in a substan- tial reduction in emissions of carbon monoxide (CO) and total organic gases (TOG), and a small reduction in emissions of nitrogen oxide (NOx), and partic- ulate matter (PM). These emission reductions are due to an expected reduction in fuel usage and time spent traveling, and a predicted increase in average travel speed. The Demand Management Alternative would have more of a reduc- tion in air contaminant emissions than the Conventional Alternative due to higher vehicle occupancy and a reduction in volume. 7_0 CARBON MONOXIDE (CO) MICROSCALE ANALYSIS , The mobile sources analysis for a localized (microscale) area applies mathematical models that simulate physical conditions to predict CO concentra- tions at specific "receptor" locations. Mobile source dispersion models are the basic analytical tools used to estimate carbon monoxide levels expected under given conditions of traffic, roadway geometry and meteorology. The mathematical expressions and formulations that comprise the various model's attempt to describe an extremely complex physical phenomenon. However, be- cause all models contain simplifications and approximations of actual condi- tions and interactions, most of these dispersion models are conservative. The , model and the factors included in the study process are described below. 14 1 t 1 1 1 1 1 1 1 1 1 1 1 1 1 SCALE 1' = 216=' Source :Orange County EMA . FIGURE 3 Route 73 REGIONAL AIR QUALITY San. Joaquin Hills ANALYSIS AREA Transportation Corridor Dispersion Model - Caline4 The dispersion model utilized in this study is CALINE4. This mathemati- cal line source model is a Gaussian model for predicting pollutant concentra- tions along roadway segments. This type of model assumes that the dispersion of pollutants downwind of a pollution sources follow a Gaussian (or "normal") distribution. A complete explanation of the mathematical formulation, basic assumptions and limitations of the models are given in the report entitled "Caline4 - A Dispersion Model for Predicting Air Pollutant Concentrations Near Roadways" (REPORT NO. FHWA/CA/TL-8415). The Caline4 model is an approved FHWA and Environmental Protection Agency dispersion model. (Representative sample inputs and results of the Caline4 model are found in Appendix A.) Receptor Locations Twenty-nine (29) receptor sites throughout the study area were selected for detailed study (Figure 4). The selection was based upon the projected maximum changes in carbon monoxide concentrations due to future traffic condi- tions and development. Sites were also chosen to include receptors such as parks, schools, and residences as well as other sensitive land use types.Receptors were placed along the right-of-way for each alternative. Where it was appropriate, receptors were placed at property lines of resi- dences. Receptor sites were also chosen near the toll plaza ramps for each alternative based on traffic conditions. A receptor site was also selected near the mainline toll plaza under each alternative. Meteorological Conditions The transport and concentration of pollutants from vehicular sources are influenced by three principle meteorological factors: wind direction, wind speed and atmospheric stability. Values for these parameters were chosen through guidelines developed by the State of California, Department of Trans- portation Laboratory's Manual "Air Quality Technical Analysis Notes" (AQTAN). The values used in this analysis are as follows: Temperature 8° C Wind Speed — 0.5 m/s Atmospheric Stability a G Wind Direction Worst Case Sigma Theta — 100 Traffic Data Traffic data for the air quality analysis was prepared by the Corridor Design Management Group (CDMG) and is based on AM and PM peak hour periods and eight hour peak period, the periods when the highest carbon monoxide levels are expected for the following conditions: 1995 Initial operations with three mixed flow lanes in each direction and toll facilities; 15 "n m m .01 Fri 'i NI, D �. �4 } p�C= . XS4 I -n mr POI ID FIV CD CL 4 s• — I L 0 4144 , 17 ch iiA ST&LI, j RD cl OA I IIAIIVAIIL)- ilk OR '20 SPYGLAS4 'I HILL c IX -Sow /iY CANVON—\- cp at A I v, chi *N, -74 0 Vi vr, fill ALIC14 oil C� `VS11, VALLEY po pq Fqu/Y4 il NO If Al IPA( st 4 --- - -.1 1 I 1 F 1 1 1 I 1 2010 Conventional Alternative Operations with four mixed flow lanes in each direction, one HOV lane in each direction, and toll .facili- ties; 2010 Demand Management Alternative Operations with three mixed flow lanes in each direction, two reversible HOV lanes and toll facili- ties. Traffic volumes are based on no -toll segments except the mainline toll plaza, jections. Persistence Factor traffic proj-ections at all Corridor which is based on toll traffic pro - Peak eight hour concentrations were obtained by applying a persistence factor of 0.7 to the maximum predicted one hour values. This factor takes into account the fact that over eight hours. (as distinct from a single hour) vehicle volumes will fluctuate downwards from the peak, vehicle speeds may vary, and meteorological stability will change to some degree as compared to the very conservative assumptions used for'the single maximized one hour. Vehicular Emissions Vehicular emissions were calculated using the latest version of Cal - trans' EMFAC7 modeling program. The model calculates composite emission factors from a statistical mix of individual emission rates from the exhaust, crankcase, and evaporative systems of individual vehicles. These rates. are modified by a number of factors which affect emission including: operating mode. vehicle types, vehicle age distribution, speed, ambient temperature, etc. As recommended by Caltran, the percentage of hot/cold starts should be 2/10 for this type of roadway. - All inputs to the model, as listed in Table 4, were taken from the California's Air Quality Technical Analysis Notes (AQTAN) for the Southern California region. Traffic mix was obtained from the project's traffic engi- neers with Caltrans' approval. (The EMFAC7 results are found in Appendix A,) The Corridor lies within an area covered by a biennial smog check program. In accordance with the AQTAN's screening process, a 10% emission reduction may be taken. Since there is a linear relationship between Caline4 results and emis- sion factors, this reduction was taken from the Caline4 results. Background CO Concentrations Existing CO concentrations measured along the Corridor by Caltrans were used for the background concentrations. Emissions data were estimated for an average winter weekday in Orange County because CO concentrations are highest during winter months. Caltrans measured CO concentrations for a total of six weeks at The Irvine Company property at the corner of Bonita Canyon Road and Sunnyhill Road in the City of Irvine: The following second highest maximum one hour and eight hour background CO levels were used: one hour eight hour 8 ppm 3.4 ppm Table 4 VARIABLES USED TO DETERMINE VEHICULAR EMISSION FACTORS Ambient Air Temperature (with 50F correction factor) Vehicle Mix: Autos Light Duty Trucks Medium Duty Trucks Heavy Duty Trucks -Gas Heavy Duty Trucks -Diesel Percentage Hot Starts Percentage Cold Starts 50OF AM PM 77.0% 79.0% 19.0% 19.0% 2.8% 1.4% 0.84% 0.42% 0.36% 0.18% 2.0% 10.0% 17 L� 8.0 PREDICTED _ CO LEVELS Future 1995 and 2010 carbon monoxide concentrations were predicted at each of the receptor sites using the CALINE4 dispersion model. This mathe- matical line source model is a Gaussian model for predicting pollutant concen- trations along roadway segments. This type of model assumes that the disper- sion of pollutants downwind of pollution sources follow a Gaussian (or 'nor- mal") distribution. The predicted concentrations for AM and PM peak hours and the eight hour peak period are shown in Tables 5, 6 and-7 and described below with respect to each project alternative. Conventional Alternative 1 Carbon monoxide (CO) levels are predicted to be in compliance with the one -hour and eight -hour standards at all locations. Demand Management Alternative Similar to the Conventional Alternative, CO levels are within the one hour and eight hour standards at all locations. I-5 Interchange ' The SJHTC terminates at the junction with I-5, forming a junction type interchange. There are two proposed options for this interchange providing connections to and from the south on I-5. Option 1 provides access to and from the south on I-5 occurring approximately 2,500 feet south of Avery Park- way. Option 2 provides similar access connecting to I-5 approximately 2,000 feet to the north. The CO levels at site 7, Paseo de Colinas, are higher for Option 1. 9_0 MITIGATION MEASURES There are no predicted violations of the CO standards that would require mitigation. The project is consistent with the most currently available air quality plans and is anticipated to result in a positive net effect on air quality by providing roadway capacity improvements that would accommodate local traffic increases without significant adverse air quality impacts. No long-term air quality mitigation measures are required. ' No further mitigation measures are required since no violations of State and 'federal standards are predicted due to the project, and there will be a positive net effect on regional air quality. 10.0 PARK AND RIDE FACILITIES Park and ride lost would be provided along the Corridor to serve bus riders, vanpools and carpools. The locations of the park and ride lots would be close to the Corridor, preferably at arterial crossings with transit sere= ice ramps (Figure 5). 1 1 18 Site Location 1 2 3 4 5 6 7 7A 8 9 10 11 12 13 14 15 16 17 18 19 20 20A 21 22 23 24 25 26 27 28 29 Table 5 1995 PREDICTED CARBON MONOXIDE (CO) LEVELS - PPM CONVENTIONAL OPERATIONS 1 Hour 8 Hour* AM / PM man Juan bcnooi-Playing Field at Spring Street 11 / 12 Playground/Little League Field 11 / 11 Serra Park 10 / 10 Nearest Backyard to Junipero Serra Interchange 11 / 11 Nearest Backyard in Village of San Juan near Junipero Serra 11 / 11 Roston Montessori School Entrance 12 / 11 Paseo de Colinas -Nearest Develop- ment at Avenida del Cabello 14 / 14 Paseo de Colinas 14 / 14 C.V./Cabot Road Intersection 12 / 12 Greenfield Drive Interchange 10 / 10 and Park -and -Ride Lot Private Corral @ Nellie Gail Rd. 10 / 11 Moulton Interchange 11 / 12 Nellie Gail Ranch -Nearest Backyard 11 / 11 Laguna Hills Hospital - Entrance 12 / 12 Existing Development @ Pacific Park Drive 10 / 11 LaPaz Interchange at Development 11 / 11 Alicia Pkwy.-Development and Tennis Court & Park -and -Ride Lot 10 / 10 Aliso Creek Road-Aliso Viejo High Density Housing, nearest tract 10 / 10 Laguna Hills - Proposed Development & Park -and -Ride Lot 10 / 10 E1 Toro Road Interchange and Toll Nearest Tract of Laguna Audubon Development and Nearest Backyard of Cal. Cove Development and Park -and -Ride Lot 12 / 12 Laguna Cyn.-Proposed Golf Course 12 / 11 Laguna Canyon 10 / 10 Sand Canyon Road -Crystal Cove Pk. 9 / 9 Mainline Toll 16 / 16 Bonita Canyon -Near Wetland Area and Park -and -Ride Lot 11 / 11 Pelican Hill Road Interchange 9 / 9 Bison Avenue Interchange 10 / 11 MacArthur Interchange 10 / 11 University Drive Interchange 12 / 12 Jamboree Road -Proposed Building 13 / 13 Bristol St. -Entrance to Building 11 / 12 5.9 5.9 4.6 5.3 5.2 6.0 7.7 7.7 6.1 4.6 5.1 6.1 5.5 6.3 5.8 5.7 Me 4.7 4.8 6.2 6.1 5.0 4.3 8.7 5.5 4.3 5.4 5.2 6.0 7.1 5.9 All levels include background concentrations (8 ppm = 1 hr; 3.4 = 8 hr). Maximum 8-hour concentrations based on either AM or PM peak values. 19 1 ISite Location 1 2 3 4 5 6 7 7A 8 9 10 11 12 13 14 15 16 17 18 19 ' 20 21 22 1 23 1 i 1 24 25 26 27 28 29 Table 6 2010 PREDICTED CARBON MONOXIDE (CO) LEVELS - PPM CONVENTIONAL OPERATIONS 1 Hour 8 Hour* AM L PM San Juan School -Playing Field at Spring Street 11 / 11 Playground/Little League Field 11 / 11 Serra Park 10 / 10 Nearest Backyard to Junipero Serra Interchange 11 / 11 Nearest Backyard in Village of San Juan near Junipero Serra 11 / 11 Roston Montessori School Entrance 11 / 11 Paseo de Colinas -Nearest Develop- ment at Avenida del Cabello 13 / 13 Paseo de Colinas 13 / 12 C.V./Cabot Road Intersection 14 / 14 Greenfield Drive Interchange 11 / 11 and Park -and -Ride Lot Private Corral @ Nellie Gail Rd. 12 / 10 Moulton Interchange 12 / 12 Nellie Gail Ranch -Nearest Backyard 11 / 11 Laguna Hills Hospital - Entrance 12 / 12 Existing Development @ Pacific Park Drive 10 / 11 LaPaz Interchange at Development 12 / 12 Alicia Pkwy.-Development and Tennis Court & Park -and -Ride Lot 11 / 11 Aliso Creek Road-Aliso Viejo High Density Housing, nearest tract 11 / 11 Laguna hills - Proposed Development & Park -and -Ride Lot 11 / 11 El Toro Road Interchange and Toll Nearest Tract of Laguna Audubon Development and Nearest Backyard of Cal. Cove Development and Park -and -Ride Lot 11 / 12 Laguna Gyn.-Proposed Golf Course 12 / 12 Sand Canyon Road -Crystal Cove Pk. 10 / 10 Mainline Toll 16 / 16 Bonita Canyon -Near Wetland Area and Park -and -Ride Lot 12 / 12 Pelican Hill Road Interchange 10 / 10 Bison Avenue Interchange 11 / 11 MacArthur Interchange 10 / 10 University Drive Interchange 11 / 11 Jamboree Road -Proposed Building 14 / 15 Bristol St. -Entrance to Building 11 / 11 5.6 5.5 4.5 5.3 5.2 5.7 7.1 6.7 7.7 5.6 6.5 5.9 5.4 F 6.2 5_ 4 6.1 OVA 5.3 5.4 5.9 6.2 4.7 8.9 6.2 4.7 5.5 5.0 5.8 8.1 5.6 All levels include background concentrations (8 ppm = 1 hr; 3.4 = 8 hr). * Maximum 8-hour concentrations based on either AM or PM peak values. 20 Site Location 1 2 3 4 5 6 7 7A 8 9 10 11 12 13 14 15 16 17 18 19 20 20A 21 22 23 24 25 26 27 28 29 Table 7 2010 PREDICTED CARBON MONOXIDE (CO) LEVELS - PPM DEMAND MANAGEMENT OPERATIONS 1 Hour 8 Hour* AM / PM San Juan School -Playing Field at Spring Street 11 / 11 Playground/Little League Field 11 / 11 Serra Park 10 / 10 Nearest Backyard to Junipero Serra Interchange 11 / 11 Nearest Backyard in Village of San Juan near Junipero Serra 11 / 11 Roston Montessori School Entrance 11 / 11 Paseo de Colinas -Nearest Develop- ment at Avenida del Cabello 13 / 13 Paseo de Colinas 13 / 12 C.V./Cabot Road Intersection 14 / 14 Greenfield Drive Interchange 11 / 11 and Park -and -Ride Lot Private Corral @ Nellie Gail Rd. 13 / 11 Moulton Interchange 12 / 12 Nellie Gail Ranch -Nearest Backyard 11 / 11 Laguna Hills Hospital - Entrance 12 / 12 Existing Development @ Pacific Park Drive 11 / 11 LaPaz Interchange at Development 12 / 12 Alicia Pkwy.-Development and Tennis Court & Park -and -Ride Lot 11 / 11 Aliso Creek Road-Aliso Viejo High Density Housing, nearest tract 11 / 11 Laguna Hills - Proposed Development & Park -and -Ride Lot 11 / 11 E1 Toro Road Interchange and Toll Nearest Tract of Laguna Audubon Development and Nearest Backyard of Cal. Cove Development and Park -and -Ride Lot 14 / 14 Laguna Cyn.-Proposed Golf Course 13 / 13 Laguna Canyon 12 / 12 Sand Canyon Road -Crystal Cove Pk. 11 / 12 Mainline Toll 16 / 16 Bonita Canyon -Near Wetland Area and Park -and -Ride Lot 12 / 13 Pelican Hill Road Interchange 11 / 11 Bison Avenue Interchange 11 / 11 MacArthur Interchange 11 / 11 University Drive Interchange 12 / 11 Jamboree Road -Proposed Building 15 / 15 Bristol St. -Entrance to Building 12 / 12 5.6 5.5 4.5 5.3 5.2 5.7 7.1 6.7 7.8 5.5 61 1 5.5 6.2 5.5 6.0 OVA 5.7 5.8 7.7 6.9 6.3 6.0 8.9 6.8 5.7 5.5 5.5 6.3 8.4 6.0 All levels include background concentrations (8 ppm — 1 hr; 3.4 — 8 hr). Maximum 8-hour concentrations based on either AM or PM peak values. 21 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 GQW� 0 Joll 04 a 441 19 'NIT No cm quvo 714 tb, -if IFAA ma's" cc 41 The park and ride lots are included in the geometry and traffic inputs to the CALINE4 dispersion model at the following intersections: Park and Ride Location Air Quality Receptor Location Crown Valley Parkway Site 9 Alicia Parkway Site 16 Laguna Hills Drive Site 18 E1 Toro Road Site 19 Ford Road Site 23 The square footage of the lots was determined by the number of parking, circulation and bus space required. The average travel distance is assume to be half the length of the lot. All vehicles are assume to idle for 60 seconds due to warm-up, back-up and exit queue. The factors used for this analysis can be found in Appendix B. The air quality modeling sites with a park and ride lot had receptors placed along the lot's perimeter to obtain the highest CO levels due to the combination of Corridor and parking lot. At all sites, the distance between the lot and Corridor was large enough to make the cumulative impact minor. The results of this analysis are included Tables 5, 6 and 7. 11.0 HEALTH RISKS Carbon monoxide is a colorless, essentially odorless gas. It is gener- ally classed as an asphyxiant because of its strong combination with hemoglo- bin in the blood. This combination of hemoglobin and carbon monoxide is called carboxyhemo glob in (COHb). Normal levels of COHb in the blood are typically about 0.5 percent. However, if high levels of carbon monoxide are breathed then the levels of COHb increase, and the ability of the lungs to take up fresh oxygen supplies is limited. Table 8 shows health symptoms related to different levels of COHb. At the top end of the scale, death will occur when the COHb level in the bloodstream reaches 80%. At the low end of the scale, health effects are first noted, when the COHb level reaches 2.5%, as an aggravation of existing cardiovascular disease. Breathing air with 20 ppm of carbon monoxide for eight hours results in a COHb level of 2%. In- creasing this uptake to 30 ppm of carbon monoxide for eight hours results in COHb levels of 5%. The projections of carbon monoxide levels along the Corri- dor are less then 9 ppm for an eight hour period: 3.4 ppm existing CO level and a maximum of 5.5 ppm from the Corridor traffic movements. 12.0 COMPARISON OF TOLL AND TOLL FREE OPERATIONS An analysis of toll and toll free traffic projections at selected loca- tions along the Corridor indicate that there is little difference in either mainline or arterial traffic volumes. The absence of parallel routes along the SJHTC account for the small difference between toll and toll free traffic volumes. r� 5 1 1 1 1 1 1 u E 1 22 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 Table 8 EFFECTS OF CARBON MONOXIDE Percent of Carboxyhemoglobin in Blood (CoHb) 80 60 Loss of consciousness; den-th if exposure is continued. Collapse on exercise; 'confusion. Headache, fatigue; judgment disturbed-. Cardiovascular damage; electrocardiographic abnormalities. Decline (linear with increasing CoHb level) in maximal oxygen uptake of healthy young men undergoing strenuous exercise•; decrements is visual perception, manual dexterity, and performance of complex sensorimotor tasks. Decrements in vigilance (i.e., ability to detect small changes in one's environment that occur at unpredictable times); decreased exercise performance. in both healthy persons and those. with chronic obstructive pulmonary disease. Aggravation of cardiovascular disease (i.e., decreased exercise capacityin patients with angina pectoris, intermittent claudication, or - peripheral arteriosclerosis).- 40 30 20 5 4 2.5 Human Symptoms Associated With This Death Sources: Henderson; Y., and Haggard, H.W., "Noxious Gases." Chemical Catalog Co., New York, 1927. United States Environmental Protection Agency, Research Triangle Park, N.C.; Air Quality Criteria for Carbon Monoxide (preprint), EPA- 060/8--79-022, October 1979, special series. 23 fi Toll and toll free 2010 traffic volume estimates for the SJHTC and surrounding arterials fall within the tolerances of regional traffic projec- tion models. For design purposes, the toll and toll free operations along the Corridor are considered the same with few differences along the local arteri- als. The change in CO concentrations were modeled Alternative to determine the effect of removing th toll plaza from the Corridor (Table 9). e for the Demand Management ' ramp tolls and mainline The CO levels predicted at the mainline toll plaza (Site 22) south of the Sand Canyon Road interchange would be significantly lower for the toll free operations and would not exceed either the one hour and eight hour stand- ards for either the Conventional or Demand Management alternatives. At the ramp toll plaza locations, Sites 11, 12, and 13, the CO levels would also be significantly lower for toll free operations. At Sites 14 and 19, the levels would be slightly lower and no change would occur at Sites 10, 17, 21, 23, and 24. Toll free operations of the SJHTC would result in compliance with the CO standards. 13.0 CONSTRUCTION ACTIVITY IMPACTS Soil disturbance to clear the project site, prepare the road base, pave the roadways and install curbs, medians, gutters, etc. will generate consider- able quantities of dust during the construction phase. This dust will tend to leave the project site and contaminate other areas if preventive measures are not taken. Such "fugitive" dust generation depends on a large number of variables including soil moisture, silt content, wind speed, and disturbance level, so that there is no universal dust emissions factor to allow an accu- rate estimate of project dust impacts. The California Air Resources Board (ARB) estimates that roadway construction disturbance covers 6.46 acres per mile, and that the average monthly emissions factor is 600 pounds per acre disturbed when normal dust control procedures (watering, compaction, and slow speed travel on unpaved surfaces) are utilized. When this factor is applied to the approximately 17.5-mile corridor alignment, an average daily dust generation rate of about 1.75 tons per day during a typical weekday is pre- dicted if the entire length of roadway is under simultaneous construction. Actual construction will be phased where certain improvements to bridges and ramps have to be made before actual travel lanes can be accommodated. The daily emissions will therefore be considerably lower. Because the dust generation factor is so imprecise and varies substan- tially with activity level, it is not possible to translate fugitive dust from construction into an accurate ambient air quality impact or to precisely differentiate between various development alternatives. In terms of possible health effects from breathing construction -activity soil dust, such material is generally chemically inert, and much of the dust is composed of large particles that are readily filtered by human breathing passages. These par- ticulates rapidly settle out on horizontal surfaces such as parked cars, landscaping foliage, outdoor furniture, etc. 1 1 1 u 1 �J 7 �I 1 1 24 ' Table 9 COMPARISON OF TOLL AND TOLL FREE OPERATIONS CO LEVELS ' Site Location Maximum Concentrations* (ppm) Toll Toll Free 10 Private Corral @ Nellie Gail 6.6 6.6 Road 11 Moulton Interchange 6.0 4.9 12 Nellie Gail Ranch -Nearest 5.5 4.7 Backyard 13 Laguna Hills Hospital - Entrance 6.2 4.9 14 Existing Development @ Pacific 5.5 5.1 17 Park Drive Aliso Creek Road-Aliso Viejo 5.7 5.3 High Density Housing, nearest tract ' 19 E1 Toro Road Interchange and Toll 7.7 7.6 Nearest Tract of Laguna Audubon Development and Nearest Backyard of Cal. Cove Development 21 Sand Canyon Road -Crystal Cove 6.0 6.0 Park 22 23 Mainline Toll Bonita Canyon -Near Wetland Area 8.8 6.8 6.5 6.8 24 Pelican Hill Road Interchange 5.7 5.7 ' * Maximum eight -hour based concentrations on either AM or PM peak values for Demand Management. i 25 In addition to fugitive dust, construction activities will cause combus- tion emissions to be released from on -site construction equipment and from ' off -site vehicles hauling concrete and other roadbed materials. The mobile nature of these sources is such that no single receptor is exposed for any length of time to the nitrogen oxides (NO �, carbon monoxide (CO), and combus- tion particles released by the heavy equipment. Noticeable local impacts will ' be occasional diesel exhaust odors. d 1 1 u� 1 'J 1 1 1 1 26 1 E '1 I J I I P, 1 APPENDIX A EMFAC7PC AND CALINE4 MODEL SAMPLE RESULTS 1 The following contains the information used in the CALINE 4 and EMFAC7 runs for the San Joaquin Transportation Corridor. Note: EMFAC7PC emissions have been increased by 16 percent. This was done to correct our version (C) to the current version (D) which is not, as of now, available in PC form. Qsee alckrc &AQ� rnen.c) . Ambient Air Temperature: 50 F (41.4 F(AQTAN) + 5.0 F (Cor. Factor) = 46.4 F) Note: 45 F is not a choice on the EMFAC7 program, thus the closest temperature, which is 50'F, was used. Vehicle Mix: AM PM Autos: 77.0% 79.0% Light Duty Trucks: 19.0% 19.0% Medium Duty Trucks: 2.8% 1.4% Heavy Duty Trucks (Gas): .84% .42% Heavy Duty Trks (Diesel): .36% .18% Percentage of Hot/Cold Starts: 2/10 Speeds: Local and Arterial Rdwys: 15 mph Loop Ramps: 20 mph Diamond Ramps: 30 mph Surface Roughness: 100 Mixing Height: 1,000 Wind Speed: 0.5 m/s Sigma Theta: 10 Stability Class: G Wind Direction: Worst Case Mixing Zone: 12' X (# of lanes) + median width + 20' The Corridor lies within an area covered by a biennial smog check pro- gram. In accordance with the AQTAN's screening process, a ten percent emission reduction may be taken. Since there is a linear relationship between Caline4 and emission factors, this reduction was taken from the Caline4 results. The sample results are for the following. sites: ' Site W Location 20 Laguna Canyon (Demand Management and Conventional) 2010 ' 22 Mainline Toll (Demand Management) 2010 25 Bison Avenue (Demand Management and Conventional) 2010 1 27 University Drive (Demand Management) " 2010 I I 11 A 1 1 r C u 1 a 1 1 1 1 l 1 1 1 1 JAN 31 '90 13:46 HNTB AA P.4/4' •>f C�ttF/,itN1A CEORC.i pEUtCME11AN, Go:. ^1R R.ESOURCES SQARD •� t tat G STREEz Zsa� O. Box M3 r SAC mfir4o, CA 93812 f Apr 11 28, AM To: Al PoIItit ton Control D,l,strIcts,' Alr° Qua 1.1ty mitnte.nance Distr•Icts. Transoor•tatlon Planning A•genc€.es,; Counoi•l- of Governments, Cattrans,'and Interested Paroles Motor Yeh.iGie Emisalort__Fa•ctor .ProerZm - i~bti:A i In a January 20, 1988 letter,- we advlsed•,you that .they ARS staff was r.eviewing the latest• avaIIabI* da.ta',on motor vehlcte emissions .and would* soon release a new version of EMFAC7. The'• review Is now complete, and EMFAC70 (based on' the new emission factors) is ava.l i'able. The following table presents the expected percent chinge between EMFAC7C and £MFAC7D In emission.- estAmates• for calendar ygars•TS87 and 2000. STATEWIDE ON -ROAD MOTOR VEHICLE EMISSIONS •PERCENT CHANGE IN EMlSSI.CNS 4.� Percent Change EMFAC7-0-over EMFAC7C' YEAR JOG S Nbx 198.7 +8 +8 +3: QGO +6 t16 +4- Complet'a documentation of the EM`FAC7D estimation methods and data is avaII'able upon reques.t as supplement 1 to *Methodology to Catcut.ate Emission Factors for On -Road •Motor Vehicles".. If you -n.eed the EMFAC-computer program.* or. other informat[oh Concerning the new emission fac,tor•s. •please donta'ct Pranay Avlanl at (.g1'$) 445-9798 or Ed Yctter' at (91"6) 323-603-3 or wr I:te to: California Air Resources Board Techn-1 ca 1 Support Division R.O. Box ••2815 Sacramento, CA 96812 ATTN: Ur . Ed Yot ter AM EMFAC7PC EMISSION FACTORS VERSION: EMFAC7C ... 114187 YEAR: 1995 TEMPERATURE: 50 PERCENT VMT COLD: 10.0 PERCENT VMT HOT: 2.0 SPEED TOG CO CO* NOX 5 MPH 2.72 36.63 42.49 1.22 10 MPH 2.02 28.17 32.68 1.1 15 MPH 1.55 22.26 25.82 1.02 20 MPH 1.23 17.76 20.60 0.95 25 MPH 0.99 14.22 16.50 0.91 30 MPH 0.82 11.42 13.25 0.88 35 MPH 0.69 9.2 10.67 0.87 40 MPH 0.59 7.44 8.63 0.88 45 MPH 0.51 6.07 7.04 0.9 50 MPH 0.46 4.99 5.79 0.94 55 MPH 0.42 4.13 4.79 0.99 Idle Emission Factors Total Organic Gases 0.11 Grams/ Minute Carbon Monoxide 1.39 Grams/Minute (1.61 Grams/Minute)* Nitrogen Oxide 0.08 Grams/Minute * CO emissions were increased by I6% . This was done to correct our version (C) to the current version (D) which is not, as of now available in PC form. Please reference the following memo. PM EMFAC7PC EMISSION FACTORS VERSION: EMFAC7C ... 114187 YEAR: 1995 TEMPERATURE: 50 PERCENT VMT COLD: 10.0 PERCENT VMT HOT: 2.0 SPEED TOG CO CO* NOX 5 MPH 2.65 35.83 41.56 1.16 10 MPH 1.97 27.67 32.10 1.05 15 MPH 1.52 21.93 25.44 0.96 20 MPH 121 17.52 20.32 0.9 25 MPH 0.98 14.04 16.29 0.86 .. 30 MPH 0.81 11.26 13.06 0.83 35 MPH 0.68 9.05 10.50 0.80 40 MPH 0.58 7.31 8.48 0.82 45 MPH 0.51 5.93 6.88 0.84 50 MPH 0.45 4.84 5.61 0.87 55 MPH 0.41 3.96 4.59 0.92 Idle Emission Factors Total Organic Gases 0.11 Grams/ Minute Carbon Monoxide 1:33 Grams/Minute (1.54 Grams/Minute)* Nitrogen Oxide 0.08 Grams/Minute * CO emissions were increased by 1691o. This was done to correct our version (C) to the current version (D) which is not, as of now available in PC form. Please reference the following memo. 1 AM EMFAC7PC EMISSION FACTORS VERSION: EMFAC7C ... 114187 YEAR: 2010 TEMPERATURE: 50 PERCENT VMT COLD: 10.0 PERCENT VMT HOT: 2.0 SPEED TOG CO CO* NOX 5 MPH 2.01 29.62 34.36 1.05 10 MPH 1.54 23.61 27.39 0.95 15 MPH 1.21 18.88 21.90 0.87 20 MPH 0.96 15.13 17.55 0.81 25 MPH 0.78 12.15 14.09 0.77 30 MPH 0.64 9.77 11,.33 0.74 35 MPH 0.54 7.87 9.13 0.73 40 MPH 0.46 6.35 7.37 0.73 45 MPH 0.4 5.15 5.97 0.74 50 MPH 0.35 4.19 4.86 0.77 55 MPH 0.32 3.43 3.98 0.81 Idle Emission Factors Total Organic Gases 0.08 Grams/ Minute Carbon Monoxide 1.03 Grams/Minute (1.19 Grams/Minute)* Nitrogen Oxide 0.07 Grams/Minute * CO emissions were increased by 16°!o . This was done to correct our version (C) to the current version (D) which is not, as of now available in PC form. Please reference the following memo. I PM EMFAC7PC EMISSION- FACTORS VERSION. EMFAC7C ... 114187 YEAR: 2010 TEMPERATURE: 50 PERCENT VMT COLD: 10.0 PERCENT VMT HOT: 2.0 ISPEED TOG CO CO* NOX 5 MPH 1.97 29.14 33.80 0.99 10 MPH 15 MPH 1.51 1.19 23.31 18.68 27.04 21.67 0.89 0.81 20 MPH 0.94 14.99 17.39 0.76 25 MPH 0.77 12.04 13.97 0.72 �1 30 MPH 0.63 9.67 11.22 0.69 35 MPH 0.53 7.78 9.02 0.68 40 MPH 0.45 6.27 7.27 0.68 45 MPH 0.39 5.06 5:87 0.69 50 MPH 0.35 4.09 4.74 0.71 �. 55 MPH 0.31 3.32 3.85 0.75 Idle Emission Factors Total Organic Gases 0.08 Grams/ Minute Carbon Monoxide 0.99 Grams/Minute (1.15 Grams/Minute)* Nitrogen Oxide 0.07 Grams/Minute * CO em issions were increased by 16% . This was done to correct our version (C) to the current version (D) which is not, as of now available in PC form. Pleasereference the following memo. 1 I HOV EMFAC7PC EMISSION FACTORS VERSION: EMFAC7C ... 114187 YEAR: 2010 TEMPERATURE: 50 PERCENT VMT COLD: 10.0 PERCENT VMT HOT: 2.0 SPEED TOG CO CO* NOX 5 MPH 1.9 28.34 32.87 0.92 10 MPH 1.47 22.76 26.40 0.83 15 MPH 1.15 18.28 21.20 0.75 20 MPH 0.92 14.68 17.03 0.7 25 MPH 0.75 11.8 13.69 0.66 30 MPH 0.62 9.48 11.00 0.64 35 MPH 0.52 7.61 8.83 0.62 40 MPH 0.44 6.12 7.10 0.62 45 MPH 0.38 4.92 5.71 0.63 50 MPH 0.34 3.95 4.58 0.65 55 MPH 0.3 3.18 3.69 0.68 Idle Emission Factors Total Organic Gases 0.07 Grams/ Minute Carbon Monoxide 0.94 Grams/Minute (1.09 Grams/Minute)* Nitrogen Oxide 0.06 Grams/Minute * CO emissions were increased by 16°!0 . This was done to correct our version (C) to the current version (D) which is not, as of now available in PCform. Please reference the following memo. i ri QUEUE FOR TOLLS - MAINLINE SAMPLE Formulas based on information obtained through John Jaeckel of Howard Needles Tammen and Bergendoff. Assuming a 10-car queue for each toll lane: Queue dimensions: 1 vehicle = 7 meters Length of queue: 10 vehicles x % / m = 70 meters = 230' Vehicle Mainline Toll = 10 gates in each direction 1/3 will be exclusively AVI 7 gates will have queues Idle = (1.03 g) x (106 ugrams) x (1.16) x (29.62) x 1 min x 1 veh = 6817 ug/m ( veh/mi) (grams) ( ) (12.52) 60 sec 7 m EMFAC 7C EMFAC 7D Temp. Idle Curr. Factor Adj.* * The temperature adjustment corrects the idle to the operating tempera- ture of the system. Idle emission is based on a temperature of 750; therefore, a ratio of emissions at 5 mph (500:750) will be used. Idle Emission @ 75 = Emission @ 750 and 5 mph ------------------ =----------------------- Idle Emission @ 50 = Emission @ 509 and 5 mph QTOT = (# of Lanes)(emission) = (7)(4500 ug/m-s) = 47,719 Assume Emission is 100 g/r-m VPH = (47,719 ug/m-s) = 2,765 VPH ------------- (0.1726)(100) Therefore: Volume = 2,765 VPH EF = 100 Distance = 230 feet ------------------------------------------------- DECELERATION 55 - 0 MPH 1... -- C(55)2 - (0) J 5280 = 990 feet ---------- -------- 2(2.24) 3600 Average dec. rate = 2.24 mphps* Idle — 2.86 g/min (corrected) Time Spent in decel. 55/2.24 — 24.6 secs. (1.5) x (2.86 g/min) x (24.6) x 1/60 — 1.76 grams 1.76 x 5280 = 9.4 g/veh.mile 990 Therefore: Distance = 569 feet EF = 6.15g/veh.mile 30 - 0 MPH 1... [(30)2] 5280 = 275 feet 2(2.24) 3600 Time Spent in decel. 30/2.24 = 12.5 secs. Idle = 2.86 g/min (corrected) (1.5) x (2.86 g/min) x (12.5) x 1/60 = 0.89 grams 0.89 x 5280 = 17.2 g/mile 275 Therefore: Distance — 275 feet EF — 17.2 g/veh.mile ;: iaxen zrom caline4 Manual, CALTRANS. ACCELERATION 0-30 EFA = BAG2 x 0.76e0.045(AS)* Average Accel. Rate = 2.06 mph/s AS = (Average Accel.)(Average Speed) AS = (2.06)(15) = 30.9 BAG2 — Time rate emission factor at an average spped of 16.2 mph = 5.48 Modal Time Rate = (3.05)(5.48) = 16.7 g/min Accel. Distance = 1 (30)2 5280 = 320 feet 2 2.06 3600 Time requires to reach 30 mph = 30-mph = 14.56 seconds 2.06 mph/s (16.7g) (14.56 secs) 1 min = 4.05 g of CO min 60 secs 4.05 g of CO x 5280 = 66.9 g/mile ------------ ---- 320' 1 mile Therefore: 0-30 Distance = 320 feet Emission = 66.9 g/mile ------------------------------------------------- 30-55 Average Accel. Rate = 1.46 mph/s AS = (1.46)(42.5) — 62.1 EFA a BAG2 x 0.027e0.098(AS) = BAG2 x 0.027e0.098(2.1) = BAG2 x 11.87 _ (5.48)(11.87) = 65.5 g/min * Taken from Caline4 Manual, page 57. Accel. Distance = 1.46 mph/s x 3600s/hr = 5256 mile/hr2 QX = 1 1 ((55)2 - (30)2 0.205 2 5256mi/hr2 = 0.205 mi x 5280/mi = 1067 at = & V = 55_30 = 17.12 sec. required to go from 30-55 Aav 1.46 (65.05) x (17.12 secs) x 1 min = 18.56 g of CO min 60 secs 18.56 g x 5280' = 91.8 g/mile 1082' mile, Therefore: 30-55 Distance = 1067 feet Emission — 91.8 g/mile 7 SAN JOAQUIN LAGUNA CANYON (SJ20AM.DAT) 100. 0. 0. 3 0.3048 1C0 28.0 1000.0 REC # 1 LAGUNA 2200. 620. 25.0 REC # 2 LAGUNA 1420. 1460. 15.0 REC #-3 LAGUNA 1045. 1420. 10.0 DEMAND MANAGEMENT AM (7/10) 54 0001-0002 EXT RAMP FL 40. 1240. 1040. 840. 150. 11.3 30. 32. 0002-0004 EXT RAMP FL 1040. 840. 1540. 460. 150. 11.3 25. 32. 0004-0006 EXT RAMP FL 1540. 460. 1900. 420. 150. 11.3 20. 32. 0007-0009 ENT RAMP FL 2000. 240. 2180. 680. 25. 11.3 25. 32. 0009-0011 ENT RAMP FL 2180. 680. 2920. 940. 25. 11.3 30. 32. 0001-0012 EB SR 40. 1240. 1010. 970. 125. 11.3 30. 32. 0012-0013 ES SR 1010. 970. 1840. 810. 125. 11.3 30. 32. 0013-0014 EB SR 1840. 810. 2160. 820. 125. 11.3 30. 32. 0014-0011 EB FL 2160. 820. 2920. 940. 375. 11.3 30. 32. 0011-0015 EB FL 2920. 940. 3190. 1010. 400. 11.3 30. 44., 0016-0017 ENT ,RAMP FL 1720. 840. 1790. 620. 250. 17.6 5. 32. 0017-0018 ENT RAMP FL 1790. 620. 1700. 500. 250. 17.6 12. 32. 0018-0020 ENT RAMP FL 1700. 500. 1500. 580. 250. 17:6 16. 32. 0020-0021 ENT RAMP FL 1500. M. 1540. 770. 250. 17.6 23. 32. '0021-0014 ENT RAMP FL 1540. 770. 2160. 820. 250. 17.6 30. 32. 0022-0023 EB SR -180. 1370. 990. 1050. 1700. 17.6 30. 56. 0023-0024 EB SR 990. 1050. 1800. 890. 1700. 17.6 30. 56. 0024-0025 ES BR 1800. 890. 2200. 890. 1700. 17.6 30. 56. 0025-OR26 EB FL 2200. 890. 3180. 1075. 1700. 17.6 30. 56. 0027-0028 HOVWAY SR -180. 1"0. 960. 1120._ 1625. 3.7 30. 44. 0028-0029 HOVWAY BR 960. 1120. 1760. 955. 1625. 3.7 30. 44. 0029-0030 HOVWAY BR 1760. 955. 2240. 955. 1625. 3.7 30. 44. 0030-0031 HOVWAY FL 2240. 955. 3180. 1160. 1625. 3.7 30. 44. 0032-0033 WB FL 3180. 1230. 2140. 1030. 6975. 17.6 30. 68. 0033-0034 WB BR 2140. 1030. 1710. 1030. 6975. 17.6 30. 68. 0034-0035 WB SR 1710. 1030. 930. 1190. 6975. 17.6 30. 68. 0035-0036 WB BR 930. 1190. -180. 1500. 6975.'17.6 30. 68. 0037-0038 WS FL 3180. MO. 2800. 1200. 1350. 11.3 30. U. 0038-0039 WB FL 2800. 1200. 2200. 1090. 475. 11.3 30. 32. 0039-0040 WB SR 2200. 1090. 1760. 1090. 475. 11.3 30. 32. 0040-0041 WB SR 1760. 1090. 1520. 1140. 475. 11.3 30. 32. 0041-0042 WB BR 1520. 1140. 900. MO. 925. 11.3 30. 32. 0042-0043 WB SR 900. 1280. 80. 1520. 925. 11.3 30. 32. 0038-0449 EXT RAMP FL 2800. 1200. 2200. 1180. 875. 11.3 30. 32. 0044-0046 EXT RAMP FL 2200. 1180. 1785. 1485. 875. 11.3 30. 32. 0046-0047 EXT RAMP FL 1785. 1485. 1630. 1490. 875. 11.3 20. 32. 0047-0059 EXT RAMP FL 1630. 1490. 1460. 1380. 875. 11.3 10. 32. 0041-0048 ENT RAMP FL 1520. 1140. 1800. 1200. 450. 17.6 30. 32. 0048-0050 ENT RAMP FL 1800. 1200. 1780. 1410. 450. 17.6 20. 32. 0050-0051 ENT RAMP FL 1780. 1410. 1560. 1400. 450. 17.6 10. 32. 0051-0058 0062-0052 ENT RAMP ENT RAMP DP DP 1560. 1020. 1400. 1800. 1520, 1130. 1220. 1500. 450. 150. 17.6 11.3-10. -5, '32, 32. 0052-0053 ENT RAMP FL 1130. 1500. 1060. 1380. 150. 11.3 10. 32. 0053-0043 ENT RAMP FL 1060. MO. 80. 1520. 150. 11.3 20. 32. 0107-0056 0056-0057 NB NS FL AG 2000, 1880. 240, 600. 1880. 1720. 600. 905. 1350, 1350. 21.9 21.9 10. 44. 0. 44. 0057-0058 NB AG 1720. 905. 1520. 1220. 1350. 21.9 0. 44. 0058-0059 NB DP 1520. 1220. 1400. 1380. 925. 21.9-10. 44. 0059-0060 NB DP 1400. MO. 1080. 1840. 1625. 21.9-20. 44. 0062-0063 SB DP 1020. 1800. 1480. 1180. 675. 21.9-20. 44. 0063-0016 SB DP 1480. 1180. 1720. 840. 875. 21.9-10. 44. 0016-0064 SB AG 1720. 840. 1840. 600-. 625. 21.9 0. 44. 0064-0006 SB AG 1840, 600. 1900, 420. 625, 21.9 0. 44. 0006-0065 SB FL 1900. 420. 1960. 200. 700. 21.9 10. 44. .5 .0071000. 0. 10. 8.0 r 1 77 11 i ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE L DOUGLAS, INC. .. .. m . m OBS SAN JOAQUIN LAGUNA CANYON (SJ20AM.DAT) UN: DEMAND MANAGEMENT AM (7/10) ATES 04/21/1990 TIMES 12S21S22.61 ORIENTATIONS W N x-direction 1 in.=136.5 m = 447.9 ft Be m 184 ft W-direction 1 in.=136.5 m = 447.9 ft Be m 164 ft tE S CODES link boundaries * receptor location L link label uclums (mesh./hour) L33 s \-7j5. 49625�. 50 L36 L44 Is L37r_ 27 L48 �.'XL38 LL4 41 1626. ` L32 925. L34 28. i-t00. 925. L38 `_e�g. 6 L26 L4W0. 125. L2 517" L26 0— 76. 6976. Llyf'` L22 l.1 L10' L 7 �. LLiS L-�j400. 37�6 . �' 1 L53 3 � 4 L45/25. 1360. L54 0. i 1 1 r I t CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 VERSION PAGE 1 JOB: SAN JOAQUIN LAGUNA CANYON (SJ20AM.DAT) RUN: DEM. MANAGE. (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S Z0= 100. CM BRG= WORST CASE VD= .0 CM/S CLAS= 7 (G) VS= .0 CM/S MIXH= 1000. M AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) '(FT) (FT)' ---------------- *------------------------- *------------------------------ 1. LINK 1 * 40 1240 1040 840 * FL 150 11.3 30.0. 32.0 2. LINK 2 * 1040 840 1540 460 * FL 150 11.3 25.0 32.0 3. LINK 3 * 1540 460 1900 420 * FL 150 11.3 20.0 32.0 4. LINK 4 * 2000 240 2180 680 * FL 25 11.3 25.0 32.0 5. LINK 5 * 2180 680 2920 940 * FL 25 11.3 30.0 32.0 6. .LINK 6 * 40 1240 1010 970 * BG 125 113 30.0 32.0 7. LINK 7 * 1010 970 1840 810 * BG 125 11.3 30.0 32.0 8. LINK 8 * 1840 810 2160 820 * BG 125 11.3 30.0 32.0 9. LINK 9 * 2160 820 2920 940 * FL 375 11.3 30.0 32.0 10. L"INK 10 * 2920 940 3190 1010 * FL 400 11.3 30.0 ".0 11. LINK 11 * 1720 840 1790 620 * FL 250 17.6 5:0 32.0 12. LINK 12 * 1790 620 1700 500 * FL 250 17.6 12.0 32.0 13. LINK 13 * 1700 500 1500 580 * FL 250 17.6 16.0 32.0 14. LINK 14 * 1500 580 1540 770 * FL' 250 17.6 23.0 32.0 15. LINK 15 * 1540 770 2160 820 * FL 250 17.6 30.0 32.0 16. LINK 16 * -180 1370 990 1050 * BG 1700 17.6 30.0 56.0 17. LINK 17 * 990 1050 1800 890 * BG 1700 17.6 30.0 56.0 18. LINK 18 * 1800 890 2200 890 * BG 1700 17.6 30.0 56.0 19. LINK 19 * 2200 890 3180 1075 * FL 1700 17.6 30.0 56.0 20. LINK ,20 * -180 1"0 960 1120 * BG 1625 3.7 30.0 ".0 21. LINK 21 * 960 1120 1760 955 * BG 1625 3.7 30.0 ".0 22. LINK 22 * 1760 955 2240 955 * BG 1625 3.7 30.0 ".0 23. LINK 23 * 2240 955 3180 1160 * FL 1625 3.7 30.0 ".0 24. LINK 24 * 3180 1230 2140 1030 * FL 6975 17.6 30.0 68.0 25. LINK 25 * 2140 1030 1710 1030 * BG 6975 17.6 30.0 68.0 26. LINK 26 * 1710 1030 930 1190 * BG 6975 17.6 30.0 68.0 27. LINK 27 * 930 1190 -180 1500 * -BG 6975 17.6 30.0' 68.0 28. LINK 28 * 3180 1280 2800 1200 * FL 1350 11.3 30.0 ".0 29. LINK 29 * 2800 1200 2200 1090 * FL 475 11.3 30.0 32.0 30. LINK 30 * 2200 1D90 1760 1090 * BG 475 11.3 30.0 32.0 31. LINK 31 * 1760 1090 1520 1140 * BG 475 11.3 30.0 32.0 32. LINK 32 * 1520 1140 900 1280 * BG 925 11.3 30.0 32.0 33. LINK 33 * 900 1280 80 1520 * BG 925 11.3 30.0 32.0 34. LINK 34 * 2800 1200 2200 1180 * FL 875 11.3 30.0 32.0 35. LINK 35 * 2200 1180 1785 1485 * FL 875 11.3 30.0 32.0 36. LINK 36 * 1785 1485 1630 1490 * FL 875 11.3 20.0 32.0 37. LINK 37 * 1630 1490 1400 1380 * FL 875 11.3 10.0 32.0 1 1 PAGE 2 JOB: SAN JOAQUIN LAGUNA CANYON (SJ20AM.DAT) RUN: DEM. MANAGE. (WORST CASE ANGLE) POLLUTANT: CO 38. LINK 38 * 1520 1140 1800 1200 * FL 450 17.6 30.0 32.0 39. LINK 39 * 1800 1200 1780 1410 * FL 450 17.6 20.0 32.0 40. LINK 40 * 1780 1410 1560 1400 * FL 450 17.6 10.0 32.0 41. LINK 41 * 1560 1400 1520 1220 * DP 450 17.6 -5.0 32.0 42. LINK 42 * 1020 1800 1130 1500 * DP 150 11.3 -10.0 32.0 43. LINK 43 * 1130 1500 1060 1380 * FL 150 11.3 10.0 32.0 44. LINK 44 * 1060 1380 80 1520 * FL 150 11.3 20.0 32.0 45. LINK 45 * 2000 240 1880 600 * FL 1350 21.9 10.0 ".0 46. LINK 46 * 1880 600 1720 905 * AG 1350 21.9 .0 ".0 47. LINK 47 * 1720 905 1520 1220 * AG 1350 21.9 .0 ".0 48. LINK 48 * 1520 1220 1400 1380 * DP 925 21.9 -10.0 ".0 49. LINK 49 * 1400 1380 1080 1840 * DP 1625 21.9 -20.0 ".0 50. LINK 50 * 1020 1800 1480 1180 * DP 875 21.9 -20.0 ".0 51. LINK 51 * 1480 1180 1720 840 * DP 875 21.9 -10.0 44.0 52. LINK 52 * 1720 840 1840 600 * AG 625 21.9 .0 ".0 53. LINK 53 * 1840 600 1900 420 * AG 625 21.9 .0 ".0 54. LINK 54 * 1900 420 1960 200 * FL 700 21.9 10.0 ".0 I 1 11 'I PAGE 3 JOB: SAN JOAQUIN LAGUNA CANYON (SJ20AM.DAT) RUN: DEN. MANAGE. (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X Y 2 ------------ --------------------- 1. RECPT 1 * 2200 620 25.0 2. RECPT 2 * 1420 1460 15.0 3. RECPT 3 * 1045 1420 10.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * * BRG * CONC * CONC/LINK (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 '14 15 ------------- *------- *------- *--------------------------------------------------------------------------- 1. RECPT 1 * 298. * 4.9 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 2. RECPT' 2 * 155. * 5.6 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 .0 .0 .0 .1 3. RECPT 3 * 127. * 4.6 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0- .0 .0 .1 * CONC/LINK * ' RECEPTOR * 16 17 18 19 20 21 22 23 24 (PPM) 25 26 27 28 29 30 31 32 33 34 35 ------------ *------------------------------------------------------------------------ ---------------------------- 1. RECPT 1 * .1 .8 .1 .0 .0 .1 .0 .0 .0 .0 1.6 .6 .0 .0 .0 .0 .1 .1 .0 .0 2. RECPT 2 * .0 .4 .0 .0 .0 .1 .0 .0 .0 .1 1.4 .0 .0 .0 .0 .1 .0 .0 .0 .0 3. RECPT 3 * .0 .4 .2 .0 .0 .1 .0 .0 .0 .2 2.0 .0 .0 .0 .0 .0 .3 .0 .0 .0 ICOMC/LINK * (PPM) 36 37 38-- 39---40-- 41---42---43---44-- 45---46---47---48---49---50---51---52---53---54- -RECEPTOR---* *------------- 1. RECPT 1 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .4 .2 .0 .0 .0 :3 .1 .0 .0 2. RECPT 2 * .0 .3 .1 .0 .0 .2 .0 .0 .0 .3 .3 1.1 .4 .0 .0 .4 .2 .1 .1 3. RECPT 3 * .0 .0 .0 .0 .0 .0 .0 .1 .0 .0 .3 .4 .0 .0 .0 .4 .1 .0 .0 t i SAN JOAQUIN LAGUNA CAN. (SJ20AMCV.DAT) 100. 0. 0. 3 0.3048 1CO 28.0 1000.0 REC # 1 LAGUNA 2200. 620. 25.0 REC # 2 LAGUNA 1420. 1460. 15.0 REC # 3 LAGUNA 1045. 1420. 10.0 CONVENTIONAL AM (MAP 7/10) 54 0001-0002 EXT RAMP FL 40. 1240. 1040. 840. 150. 11.3 30. 32. 0002-0004 EXT RAMP FL 1040. 840. 1540. 460. 150. 11.3 25. 32. 0004-0006 EXT RAMP FL 1540. 460. 1900. 420. 150. 11.3 20. 32. 0007-0009 ENT RAMP FL 2000. 240. 2180. 680. 25. 11.3 25. 32. 0009-0011 ENT RAMP FL 2180. 680. 2920. 940. 25. 11.3 30. 32. 0001-0012 EB BR 40. 1240. 1010. 970. 125. 11.3 30. 32. 0012-0013 ES BR 1010. 970. 1840. 810. 125. 11.3 30. 32. 0013-0014 ES BR 1840. 810. 2160. 820. 125. 11.3 30. 32. 0014-0011 ES FL 2160. 820. 2920. 940. 325. 11.3 30. 32. 0011-0015 ES FL 2920. 940. 3190. 1010. 350. 11.3 30. 44. 0016-0017 ENT RAMP FL 1720. 840. 1790. 620. 200. 17.6 5. 32. 0017-0018 ENT RAMP FL 1790. 620. 1700. 500. 200. 17.6 12. 32. 0018-0020 ENT RAMP FL 1700. 500. 1500. 580. 200. 17.6 16. 32. 0020-0021 ENT RAMP FL 1500. 580. 1540. 770. 200. 17.6 23. 32. 0021-0014 ENT RAMP FL 1540. 770. 2160. 820. 200. 17.6 30. 32. 0022-0023 ES SR -180. 1370. 990. 1050. 1700. 6.0 30. 80. 0023-0024 ES BR 990. 1050. 1800. 890. 1700. 6.0 30. 80. 0024-0025 ES BR 1800. 890. 2200. 890. 1700. 6.0 30. 80. 0025-OR26 ES FL 2200. 890. 3180. 1075. 1700. 6.0 30. 80. 0027-0028 HOVWAY BR -180. 1440. 960. 1120. 1123. 3.7 30. 44. 0028-0029 HOVWAY BR 960. 1120. 1760. 955. 1123. 3.7 30. 44. 0029-0030 HOVWAY SR 1760. 955. 2240. 955. 1123. 3.7 30. 44. 0030-0031 HOVWAY FL 2240. 955. 3180. 1160. 1123. 3.7 30. 44. 0032-0033 WB FL 3180. 1230. 2140. 1030. 7950. 4.0 30. 92. 0033-0034 WB BR 2140. 1030. 1710. 1030. 7950. 4.0 30. 92. 0034-0035 WB BR 1710. 1030. 930. 1190. 7950. 4.0 30. 92. 0035-0036 WB BR 930. 1190. -180. 1500. 7950. 4.0 30. 92. 0037-0038 WB FL 3180. 1280. 2800. 1200. 825. 11.3 30. 44. 0038-0039 WB FL 2800. 1200. 2200. 1090. 600. 11.3 30. 32. 0039-0040 WB SR 2200. 1090. 1760. 1090. 600. 11.3 30. 32. 0040-0041 WB BR 1760. 1090. 1520. 1140. 600. 11.3 30. 32. 0041-0042 WB BR 1520. 1140. 900. 1280. 1125. 11.3 30. 32. 0042-0043 WB BR 900. 1280. 80. 1520. 1125. 11.3 30. 32. 0038-0449 EXT RAMP FL 2800. 1200. 2200. 1180. 875. 11.3 30. 32. 0044-0046 EXT RAMP FL 2200. 1180. 1785. 1485. 875. 11.3 30. 32. 0046-0047 EXT RAMP FL 1785. 1485. 1630. 1490. 875. 11.3 20. 32. 0047-0059 EXT RAMP FL 1630. 1490. 1400. 1380. 875. 11.3 10. 32. 0041-0048 ENT RAMP FL 1520. 1140. 1800. 1200. 525. 17.6 30. 32. 0048-0050 ENT RAMP FL 1800. 1200. 1780. 1410. 525. 17.6 20. 32. 0050-0051 ENT RAMP FL 1780. 1410. 1560. 1400. 525. 17.6 10. 32. 0051-0058 ENT RAMP DP 1560. 1400. 1520. 1220. 525. 17.6 -5. 32. 0062-0052 ENT RAMP DP 1020. 1800. 1130. 1500. 200. 11.3-10. 32. 0052-0053 ENT RAMP FL 1130. 1500. 1060. 1380. 200. 11.3 10. 32. 0053-0043 ENT RAMP FL 1060. 1380. 80. 1520. 200. 11.3 20. 32. 0007-0056 NB FL 2000. 240. 1880. 600. 1450. 21.9 10. 44. 0056-0057 NB AG MO. 600. 1720. 905. 1450. 21.9 0. 44. 0057-0058 NB AG 1720. 905. 1520. 1220. 1450. 21.9 0. 44. 0058-0059 NS DP 1520. 1220. 1400. 1380. 925. 21.9-10. 44. 0059-0060 NB DP 1400. 1380. 1080. 1840. 1625. 21.9-20. 44. 0062-0063 SB DP 1020. 1800. 1480. 1180. 825. 21.9-20. 44. 0063-0016 SB DP 1480. 1180. 1720. 840. 825. 21.9-10. 44. 0016-0064 SB AG 1720. 840. 1840. 600. 625. 21.9 0. 44. 0064-0006 ee AG 1840. 600. 1900. 420. 625. 21.9 0. 44. 0006-0065 SB FL 1900. 420. 1960. 200. 700. 21.9 10. 44. .5 .0071000. 0. 10. 8.0 1 1 I 1 r �1 I� 1 1 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. OB: SAN JOAQUIN LAGUNA CAN. (SJ28AMCV.DAT) UN: CONVENTIONAL AM (MAP 7/10) N ATE: 04/20/1990 TIME: 14:96:40.47 ORIENTATION: W-f-E x-direction 1 in.=136.5 m = 447.9 ft Be m 164 ft W-direction 1 in.=136.5 m = 447.9 ft Be m 164 ft L 20 . L49 1625. L44 J3�.43 L21 ' 2 L33 3 L27 L L' 1123. L32 1�00. 1`125. L 6 LES 115. L2�' i 3 S CODE: link boundaries * receptor location L link label Volume (uah./hour) L24 L Lie- 350. 325. �TB�. CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 VERSION PAGE 1 JOB: SAN JOAQUIN LAGUNA CAN. (SJ20AMCV.DAT) RUN: CONVENTIONAL (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S ZO= 100. CM BRG6 WORST CASE VD= .0 CM/S CLAS= 7 (G) VS= .0 CM/S MIXH= 1000. M AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 40 1240 1040 840 * FL 150 11.3 30.0 32.0 2. LINK 2 * 1040 840 1540 460 * FL 150 11.3 25.0 32.0 3. LINK 3 * 1540 460 1900 420 * FL 150 11.3 20.0 32.0 4. LINK 4 * 2000 240 2180 680 * FL 25 11.3 25.0 32.0 5. LINK 5 * 2180 680 2920 940 * FL 25 11.3 30.0 32.0 6. LINK 6 * 40 1240 1010 970 * BG 125 11.3 30.0 32.0 7. LINK 7 * 1010 970 1840 810 * BG 125 11.3 30.0 32.0 8. LINK 8 * 1840 810 2160 820 * BG 125 11.3 30.0 32.0 9. LINK 9 * 2160 820 2920 940 * FL 325 11.3 30.0 32.0 10. LINK 10 * 2920 940 3190 1010 * FL 350 11.3 30.0 44.0 11. LINK 11 * 1720 840 1790 620 * FL 200 17.6 5.0 32.0 12. LINK 12 * 1790 620 1700 500 * FL 200 17.6 12.0 32.0 13. LINK 13 * 1700 500 1500 580 * FL 200 17.6 16.0 32.0 14. LINK 14 * 1500 580 1540 770 * FL 200 17.6 23.0 32.0 15. LINK 15 * 1540 770 2160 820 * FL 200 17.6 30.0 32.0 16. LINK 16 * -180 1370 990 1050 * BG 1700 6.0 30.0 80.0 17. LINK 17 * 990 1050 1800 890 * BG 1700 6.0 30.0 80.0 18. LINK 18 * 1800 890 2200 890 * BG 1700 6.0 30.0 80.0 19. LINK 19 * 2200 890 3180 1075 * FL 1700 6.0 30.0 80.0 20. LINK 20 * -180 1"0 960 1120 * BG 1123 3.7 30.0 44.0 21. LINK 21 * 960 1120 1760 955 * BG 1123 3.7 30.0 ".0 22. LINK 22 * 1760 955 2240 955 * BG 1123 3.7 30.0 44.0 23. LINK 23 * 2240 955 3180 1160 * FL 1123 3.7 30.0 ".0 24. LINK 24 * 3180 1230 2140 1030 * FL 7950 4.0 30.0 92.0 25. LINK 25 * 2140 1030 1710 1030 * BG 7950 4.0 30.0 92.0 26. LINK 26 * 1710 1030 930 1190 * BG 7950 4.0 30.0 92.0 27. LINK 27 * 930 1190 -180 1500 * BG 7950 4.0 30.0 92.0 28. LINK 28 * 3180 1280 2800 1200 * FL 825 11.3 30.0 ".0 29. LINK 29 * 2800 1200 2200 1090 * FL 600 11.3 30.0 32.0 30. LINK 30 * 2200 1090 1760 1090 * BG 600 11.3 30.0 32.0 31. LINK 31 * 1760 1090 1520 1140 * BG 600 11.3 30.0 32.0 32. LINK 32 * 1520 1140 900 1280 * BG 1125 11.3 30.0 32.0 33. LINK 33 * 900 1280 80 1520 * BG 1125 11.3 30.0 32.0 34. LINK 34 * 2800 1200 2200 1180 * FL 875 11.3 30.0 32.0 35. LINK 35 * 2200 1180 1785 1485 * FL 875 11.3 30.0 32.0 36. LINK 36 * 1785 1485 1630 1490 * FL 875 11.3 20.0 32.0 37. LINK 37 * 1630 1490 1400 1380 * FL 875 11.3 10.0 32.0 PAGE 2 J06: SAN JOAQUIN LAGUNA CAN. (SJ20AMCV.DAT) RUN: CONVENTIONAL ({WORST CASE ANGLE) 38. POLLUTANT: LINK 38 CO * 1520 1140 1800 1200 * FL 525 17.6 304 32.0 39. LINK 39 * 180D 1200 1780 1410 * FL 525 17.6 20.0 32.0 40. LINK 40 * 1780 1410 1560 1400 * FL 525 17.6 10.0 32.0 41. LINK 41 * 1560 1400 1520 1220 * DP 525 17.6 -5.0 32.0 42. LINK 42 * 1020 1800 1130 1500 * DP 200 11.3 -10.0 32.0 43. LINK 43 * 1130 1500 1060 1380 * FL 200 11.3 10.0 32.0 44. LINK 44 * 1060 1380 80 1520 * FL 200 11.3 20.0 32.0 45. LINK 45 * 2000 240 1880 600 * FL 1450 21.9 10.0 ".0 46. LINK 46 * 1880 600 1720 905 * AG 1450 21.9 .0 ".0 47. LINK 47 * 1720 905 1520 1220 * AG 1450 21.9 .0 ".0 48. LINK 48 * 1520 1220 1400 1380 * OP 925 21.9 -10.0 ".0 49. LINK 49 * 1400 1380 1080 1840 * DP 1625 21.9 -20.0 ".0 50. LINK 50 * 1020 1800 1480 1180 * DP 825 21.9 -20.0 44.0 51. LINK 51 * 1480 1180 1720 840 * DP 825 21.9 -10.0 ".0 52. LINK 52 * 1720 840 1840 600 * AG 625 21.9 .0 ".0 53. LINK 53 * 1840 600 1900 420 * AG 625 21.9 .0 ".0 54. LINK 54 * 1900 420 1960 200 * FL 700 21.9 10.0 ".0 1 I 1 1 I 1 PAGE 3 JOB: SAN JOAQUIN LAGUNA CAN. (SJ20AMCV.DAT) RUN: CONVENTIONAL (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X T Z ------------ --------------------- 1. RECPT 1 * 2200 620 25.0 2. RECPT 2 * 1420 1460 15.0 3. RECPT 3 * 1045 1420 10.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * BRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ------------- *------- *------- *--------------------------------------------------------------------------- 1. RECPT 1 * 301. * 2.6 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 2. RECPT 2 * 155. * 4.4 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 .0 .0 .0 .1 3. RECPT 3 * 126. * 2.6 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 * CONC/LINK * (PPM) RECEPTOR * 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 ------------ ---------------------------------------------------------------------------------------------------- 1. RECPT 1 * .0 .2 .1 .0 .0 .1 .0 .0 .0 .0 .5 .1 .0 .0 .0 .0 .2 .1 .0 .0 2. RECPT 2 * .0 .1 .0 .0 .0 .1 .0 .0 .0 .0 .3 .0 .0 .0 .0 .1 .0 .0 .0 .0 3. RECPT 3 * .0 .1 .1 .0 .0 .1 .0 .0 .0 .1 .5 .0 .0 .0 .0 .0 .3 .0 .0 .0 * CONC/LINK * (PPM) RECEPTOR * 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 ------------ ----------------------------------------------------------------------------------------------- 1. RECPT 1 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .3 .4 .0 .0 .0 .3 .0 .0 .0 2. RECPT 2 * .0 .3 .1 .0 .0 .2 .0 .0 .0 .3 .4 1.1 .4 .0 .0 .4 .2 .1 .1 3. RECPT 3 * .0 .0 .0 .0 .0 .0 .0 .1 .0 .0 .3 .5 .0 .0 .0 .4 .1 .0 .0 SJ MAINLINE TOLL**NEW** IS122AMN.DAT) 100. 0. 0. 18 0.3048 1C0 28.0 REC #1 1251SS 1600. 480. 5.0 REC #2 851 SB 1600. 540. 5.0 REC #3 45► SB 1600. 580. 5.0 REC #4 501 SS 1400. 570. 5.0 REC #5 801 SB 1400. 540. 5.0 REC #6 40, SB 1160. 580. 5.0 REC #7 80' SB 1160. 540. 5.0 REC #8 401 SB 1000. 580. 5.0 REC #9 801 SS 1000. 540. 5.0 REC #10 451 NB 200. 1320. 5.0 REC 1111 851 NB 200, 1360, 5.0 REC-#12 1251 NS 200. 1420. 5.0 REC #13 801 NS 400. 1360. 5.0 REC #14 501 N8 400. 1330. 5.0 REC #15 801 NB 640. 1360. 5.0 REC #16 401 NS 640. 1320. 5.0 REC #17 801 Na 800. 1360. 5.0 REC #18 401 NB 800. 1320. 5.0 DEN. MANAGEMENT TOLL 8/10 NEW 22 0001-0002 SS AG 0. 700. 940. 700. 700. 14.1 0. 80. 0002-0003 DECEL AG 940. 700. 1080. 700. 700. 11.2 0.100. 0003-0004 QUEUE AG 1080, 700. 1310. 710. 2061. 100, 0. 96. 0004-0005 ACCEL AG 1310. 700. 1640. 710. 700. 42.3 0.100. 0005-0006 SS AG 1640. 710. 2400. 840. 700. 14.1 0.100. 0006-0007 SB AG 2400. 840. 2940. 1020. 700. 14.1 0. 55. 0008-0009 AVI SB AG 0. 780. 620. 810. 1050. 6.0 0. 55. 0009-0010 AVI SB AG 620. 810. 2000. 860. 1050. 6.0 0. 55. 0010-0011 AVI SB AG 2000. 860. 2940. 1100. 1050. 6.0 0. 55. 0012-0013 HOV AG 2980. 1225. 2320. 1035. 2950. 5.7 0. 44. 0013-0014 HOV AG 2320. 1035. 1800. 970. 2950. 5.7 0. 44. 0014-0015 HOV AG 1800. 970. 0. 920. 2950. 5.7 0. 44. 0016-0017 NS AVI AG 2920. 1370. 2460. 1190. 3240. 6.0 0. 55. 0017-0018 NB AVI AG 2460. 1190. 2000. 1120. 3240. 6.0. 0. 55. 0018-0019 NS AVI AG 2000. 1120. 0. 1080. 3240. 6.0 0. 55. 0016-0020 NB AG 2920. 1370. 2440. 1260. 2160. 14.1 0. 80. 0020-0021 NS AG 2440. 1260. 1960. 1200. 2160. 14.1 O. 80. 0021-0022 NB 0022-0023 NB AG AG 1960. 1600. 1200, 1600. 1200. 800. 1200. 1200. 2160. 2160. 14.1 14.1 0. 0. 80. 80-. 0023-0024 DECEL AG 800. 1200. 640. 1200. 2160. 11.2 0.100. 0024-0025 QUEUE AG 640. 1200. 420. 1200. 2061. 100. 0. 96. 0025-0026 ACCEL AG 420. 1200. 80. 1200. 2160. 42.3 0.100. .5 .071000. 0. 10. 8.0 1 r 1 1 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE L DOUGLAS, INC. JOB: SJ MAINLINE TOLL**NEW** (SJ22AMN.DAT) RUN: OEM. MANAGEMENT TOLL 8/10 NEW N DATE: 04/21/1990 TIME: 14:12:39.41 ORIENTATION: W+E SCALE x-direction W-direction S 1 in.=121.4 m = 398.2 ft 1 in.=121.4 m = 398.2 ft CODE: link boundaries 50 m Be m * receptor location 164 ft 164 ft L link label volume (ush./hour) ,12 ,14 ,is ,is »10 ,13 ,is ,17 LIS ��_160. L22 L21—L20 Lis L18 l"17'-� �S4b 2160. 2061. Lis lL1 L10 2950. L12 J��,L11 � L 6/ L 8 Lose. 700. 2061. 700. 9 , 7 , 6 2 8 , 6 , 4 " 1 I �� CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 PAGE 1 VERSION JOB: SJ MAINLINE TOLL**NEW** (SJ22AMN.DAT) RUN: DEN. MANAGEM (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S ZO= 100. CM ALT= 0. (FT) BRG= WORST CASE VD= .0 CM/S CLAS= MIXH= 1000. 7 (G) M VS= .0 CM/S AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT.) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 0 700 940 700 * AG 700 14.1 .0 80.0 2. LINK 2 * 940 700 1080 700 * AG 700 11.2 .0 100.0 3. 4. LINK 3 LINK 4 * * 1080 1310 700 700 1310 1640 710 * 710 * AG AG 2061 700 100.0 42.3 .0 .0 96.0 100.0 5. LINK 5 * 1640 710 2400 840 * AG- 700 14.1 .0 100.0 6. LINK 6 * 2400 840 2940 1020 * AG 700 14.1 .0 55.0 7. LINK 7 * 0 780 620 810 * AG 1050 6.0 .0 55.0 8. LINK 8 * 620 810 2000 860 * AG 1050 6.0 .0 55.0 9. LINK 9 * 2000 860 2940 1100 * AG 1050 6.0 .0 55.0 10. LINK 10 * 2980 1225 2320 1035 * AG 2950 5.7 .0 44.0 11. LINK 11 * 2320 1035 1800 970 * AG 2950 5.7 .0 44.0 12. LINK 12 * 1800 970 0 920 * AG 2950 5.7 .0 44.0 13. LINK 13 * 2920- 1370 2460 1190 * AG. 3240 6.0 .0 55.0 14. 15. LINK 14 LINK 15 * * 2460 2000. 1190 1120 2000 0 1120 * 1080 * AG AG" 3240 3240 6.0 6.0 .0 .0 55.0 55.0. 16. LINK 16 * 2920 1370 2440 1260 * AG 2160 14.1 .0 80.0 17. LINK 17 * 2440 1260 1960 1200 * AG 2160 14.1 .0 80.0 18. 19. LINK 18 LINK 19 * * 1960 1600 1200 1200 1600 800 1200 * 1200 * AG AG 2160 2160 14.1 14.1 .0 .0 80.0• 80.0 20. LINK 20 * 800 1200 640 1200 * AG 2160 11.2 .0 100.0 21. LINK 21 * 640 1200 420 1200 * AG 2061 100.0 .0 96.0 22. LINK 22 * 420 1200 80 1200 * AG 2160 42.3 .0 100.0 I I PAGE 2 JOB: SJ MAINLINE TOLL**NEW** (SJ22AMN.DAT) RUN: DEM. MANAGEM (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X Y 2 ------------ --------------------- 1. RECPT 1 * 1600 480 5.0 2. RECPT 2 * 1600 540 5.0 3. RECPT 3 * 1600 580 5.0 4. RECPT 4 * 1400 570 5.0 5. RECPT 5 * 1400 540 5.0 6. RECPT 6 * 1160 580 5.0 7. RECPT 7 * 1160 540 5.0 8. RECPT 8 * 1000 580 5.0 9. RECPT 9 * 1000 540 5.0 10. RECPT 10 * 200 1320 5.0 11. RECPT 11 * 200 1360 5.0 12. RECPT 12 * 200 1420 5.0 13. RECPT 13 * 400 1360 5.0 14. RECPT 14 * 400 1330 5.0 15. RECPT 15 * 640 1360 5.0 16. RECPT 16 * 640 1320 5.0 17. RECPT 17 * 800 1360 5.0 18. RECPT 18 * 800 1320 5.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * BRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ------------- *....... *....... *--------------------------------------------------------------------------- 1. RECPT 1 * 301. * 5.8 * .0 .0 3.5 .2 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .2 2. RECPT 2 * 297. * 5.8 * .0 .0 3.4 .4 .0 .0 .0 .1 .0 .0 .0 .3 .0 .0 .2 3. RECPT 3 * 291. * 5.7 * .0 .0 3.8 .5 .0 .0 .0 .2 .0 .0 .0 .3 .0 .0 .2 4. RECPT 4 * 304. * 8.3 * .0 .0 5.7 .0 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .3 5. RECPT 5 * 307. * 7.4 * .0 .0 5.0 .0 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .3 6. RECPT 6 * 31. * 6.7 * .0 .0 5.8 .0 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .2 7. RECPT 7 * 25. * 5.7 * .0 .0 4.8 .0 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .2 8. RECPT 8 * 57. * 7.8 * .0 .0 6.5 .1 .0 .0 .0 .2 .0 .0 .0 .2 .0 .1 .2 9. RECPT 9 * 50. * 6.5 * .0 .0 5.4 .0 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .2 10. RECPT 10 * 116. * 7.3 * .0 .0 .7 .2 .0 .0 .0 .1 .0 .0 .0 .3 .0 .0 .4 11. RECPT 11 * 120. * 6.9 * .0 .0 1.1 .2 .0 .0 .0 .1 .0 .0 .0 .3 .0 .0 .4 12. RECPT 12 * 125. * 6.3 * .0 .0 1.3 .2 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .3 13. RECPT 13 * 132. * 7.1 * .0 .0 1.5 .1 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .3 14. RECPT 14 * 129. * 8.4 * .0 .0 1.7 .1 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .4 15. RECPT 15 * 219. * 5.9 * .1 .0 .0 .0 .0 .0 .1 .0 .0 .0 .0 .2 .0 .0 .3 16. RECPT 16 * 228. * 7.1 * .1 .0 .0 .0 .0 .0 .1 .0 .0 .0 .0 .2 .0 .0 .4 17. RECPT 17 * 240. * 5.8 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .2 .0 .0 .4 18. RECPT 18 * 247. * 6.6 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 .0 .0 .4 PAGE 3 JOB: RUN: SJ MAINLINE TOLL**NEW** DEM. MANAGEM (WORST (SJ22AMN.DAT) CASE ANGLE) POLLUTANT: CO IV. MODEL RESULTS (WORST CASE WIND ANGLE) CONCH I NK (CONT.) * (PPM) RECEPTOR * ------------ 16 ----------------------------------- 17 18 19 20 21 22 1. RECPT 1 * .0 .0 .0 .0 .0 .9 .5 2. RECPT 2 * .0 .0 .0 .0 .0 .7 .6 3. RECPT 3 * .0 .0 .0 .0 .0 .3 .4 4. RECPT 4 * .0 .0 .0 .0 .0 1.4 .5 5. RECPT -5 * .0 .0 .0 .0 .1 1.4 .3 6. 7. RECPT RECPT 6 * 7 * .0 .0 .0 .0 .1 .0 .3 .3 .0 .0 .0 .0 .0 .0 8. RECPT 8 * .1 .2 .2 .0 .0 .0 .0 9. RECPT 9 * .0 .1 .3 .0 .0 .0 .0 10. 11. RECPT RECPT 10 * 11 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 4.0 4.1 1.4 .7 12. RECPT 12 * .0 .0 .0 .0 .0 3.9 .2 13. RECPT 13 * .0 .0 ' ,0 .0 .1 4.8 .0 14. RECPT 14 * .0 .0 .0 .0 .1 5.8 .0 15. RECPT 15 * .0 .0 .0 .0 .0 5.0 .1 16. RECPT 16 * .0 .0 .0 .0 .0 6.2 .1 17. 18. RECPT RECPT 17 * 18 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .1 4.9 5.4 .4 , .7 I 1 SAN JOAQUIN BISON AVENUE (SJ25PM.DAT) 100. 0. 0. 4 0.3048 1CO 28.0 1000.0 REC # 1 370. 2820. 5.0 REC # 2 370. 3050. 5.0 REC # 3 - 930. 2550. 40.0 REC # 4 950. 2800. 45.0 DEMAND MANAGEMENT PM (MAP 10/10) 35 0001-0002 BR 750. 1200. 750. 1450. 4425. 11.2 10. 68. 0002-OOR1 BR 750. 1450. 870. 2660. 375. 11.2 20. 44. 0OR2-OOR3 OR 850. 2720. 1060. 3600. 750. 11.2 20. 44. 0OR3-OOR4 BR 1060. 3600. 1260. 3980. 750. 11.2 15. 44. 0002-0003 AG 750. 1450. 740. 2810. 4050. 11.2 0. 56. 0003-OOR5 AG 740. 2810. 1080. 3980. 400. 11.2 0. 32. 0003-0004 AG 740. 2810. 810. 3400. 3650. 14.0 0. 56. 0004-0005 OR 810. 3400. 970. 3980. 3650. 14.0 10. 56. 0OH1-OOH2 AG 690. 1200. 670. 2620. 325. 3.7 0. 32. 0OH2-OOH3 AG 670. 2620. 750. 3350. 325. 3.7 0. 32. 0OH3-OOH4 BR 750. 3350. 930. 3980. 325. 3.7 10. 32. 00H5-O0H6 OR 870. 3980. 710. 3450. 325. 3.7 10. 32. 0OH6-OOH7 AG 710. 3450. 620. 2770. 325. 3.7 0. 32. 00H7-00H8 AG 620. 2770. 640. 1200. 325. 3.7 0. 32. 0006-0007 BR 810. 3980. 650. 3390. 4750. 5.9 10. 56. 0007-0008 AG 650. 3390. 560. 2770. 4750. 5.9 0. 56. 0008-0009 AG 560. 2770. 580. 1740. 6175. 5.9 0. 56. 0009-0010 OR 580. 1740. 590. 1200. 6450. 11.2 10. 56. OR10-OOR9 OR 720. 3980. 610. 3740. 500. 11.2 10. 32. 0OR9-OOR8 OR 610. 3740. 420. 2930. 500. 11.2 20. 44. 0OR7-OOR6 BR 440. 2850. 420. 2660. 275. 11.2 20. 44. 0OR6-0009 OR 420. 2660. 580. 1740. 275. 11.2 10. 32. OR13-OR12 BR 620. 3980. 570. 3860. 1425. 11.2 10. 44. OR12-OR11 BR 570. 3860. 530. 3620. 1425. 11.2 10. 44. ORII-0008 AG 530. 3620. 560. 2770. 1425. 11.2 0. 44. 0081-00B2 BR 1750. 2610. 1350. 2610. 875. 21.7 30. 44. 0082-00R2 BR 1350. 2610. 850. 2720. 875. 21.7 30. 44. 00R2-00R8 BISON OR 850. 2720. 420. 2930. 650. 21.7 30. 44. 000-0063 BISON BR 420. 2930. 130. 3150. 1025. 21.7 30. 44. 0083-0084 BISON BR 130. 3150. -140. 3450. 1025. 21.7 30. 44. 0085-0086 BISON OR -190. 3450. 80. 3150. 675. 21.7 30. 44. 0OB6-OOR7 BISON OR 80. 3150. 440. 2850. 675. 21.7 30. 44. 0OR7-OOR1 BISON BR "0. 2850. 870. 2660. 525. 21.7 30. 44. OOR1-0087 BISON OR 870. 2660. 1350. 2560. 375. 21.7 30. 44. 0087-0098 BISON OR 1350. 2560. 1750. 2560. 375. 21.7 30. 44. .5 .0071000. 0. 10. 8.0 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE L DOUGLAS, INC. JOB: SAN JOAQUIN BISON AVENUE (SJ25PM.OAT) RUN: DEMAND MANAGEMENT PM (MAP 10/18) N DATE: 04/21/1990 TIME: 12:25:38.96 ORIENTATION: W+E SCALE : x-direction W-direction S 1 in.=113.8 m = 370.7 ft 1 in.=113.8 m = 370.7 ft CODE: link boundaries Be m 58 m * racaptor location 164 ft 164 ft L link label volume (veh./hour) 1 I 1 1 1 1 1 1 1 i 1 CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 VERSION PAGE 1 JOB: SAN JOAQUIN BISON AVENUE (SJ25PM.DAT) RUN: DEM. MANAGE. (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S ZO= 100. CM 8RG= WORST CASE VD= .0 CM/S CLAS= 7 (G) VS= .0 CM/S MIXH= 1000. M AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 750 1200 750 1450 * BG 4425 11.2 10.0 68.0 2. LINK 2 * 750 1450 870 2660 * BG 375 11.2 20.0 44.0 3. LINK 3 * 850 2720 1D60 3600 * BG 750 11.2 20.0 ".0 4. LINK 4 * 1060 3600 1260 3980 * BG 750 11.2 15.0 ".0 5. LINK 5 * 750 1450 740 2810 * AG 4050 11.2 .0 56.0 6. LINK 6 * 740 2810 1080 3980 * AG 400 11.2 .0 32.0 7. LINK 7 * 740 2810 810 3400 * AG 3650 14.0 .0 56.0 8. LINK 8 * 810 3400 970 3980 * BG 3650 14.0 10.0 56.0 9. LINK 9 * 690 1200 670 2620 * AG 325 3.7 .0 32.0 10. LINK 10 * 670 2620 750 3350 * AG 325 3.7 .0 32.0 11. LINK 11 * 750 3350 930 3980 * BG 325 3.7 10.0 32.0 12. LINK 12 * 870 3980 710 3450 * BG 325 3.7 10.0 32.0 13. LINK 13 * 710 3450 620 2770 * AG 325 3.7 .0 32.0 14. LINK 14 * 620 2770 640 1200 * AG 325 3.7 .0 32.0 15. LINK 15 * 810 3980 650 3390 * BG 4750 5.9 10.0 56.0 16. LINK 16 * 650 3390 560 2770 * AG 4750 5.9 .0 56.0 17. LINK 17 * 560 2770 580 1740 * AG 6175 5.9 .0 56.0 18. LINK 18 * 580 1740 590 1200 * BG 6450 11.2 10.0 56.0 19. LINK 19 * 720 3980 610 3740 * BG 500 11.2 10.0 32.0 20. LINK 20 * 610 3740 420 2930 * BG 500 11.2 20.0 44.0 21. LINK 21 * "Cl 2850 420 2660 * BG 275 11.2 20.0 ".0 22. LINK 22 * 420 2660 580 1740 * BG 275 11.2 10.0 32.0 23. LINK 23 * 620 3980 570 3860 * BG 1425 11.2 10.0 44.0 24. LINK 24 * 570 3860 530 3620 * BG 1425 11.2 10.0 44.0 25. LINK 25 * 530 3620 560 2770 * AG 1425 11.2 .0 ".0 26. LINK 26 * 1750 2610 1350 2610 * BG 875 21.7 30.0 44.0 27. LINK 27 * 1350 2610 850 2720 * BG 875 21.7 30.0 44.0 28. LINK 28 * 850 2720 420 2930 * BG 650 21.7 30.0 44.0 29. LIRK 29 * 420 2930 130 3150 * BG 1025 21.7 30.0 ".0 30. LINK 30 * 130 3150 -140 3450 * BG 1025 21.7 30.0 44.0 31. LINK 31 * -190 3450 80 3150 * BG 675 21.7 30.0 44.0 32. LINK 32 * 80 3150 440 2850 * BG 675 21.7 30.0 44.0 33. LINK 33 * "0 2350 870 2660 * BG 525 21.7 30.0 ".0 34. LINK 34 * 870 2660 1350 2560 * BG 375 21.7 30.0 44.0 35. LINK 35 * 1350 2560 1750 2560 * BG 375 21.7 30.0 44.0 PAGE 2 JOB: SAN JOAQUIN BISON AVENUE (SJ25PM.DAT) RUN: DEN. MANAGE. (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X Y 2 ------------ --------------------- 1. RECPT 1 * 370 2820 5.0 2. RECPT 2 * 370 3050 5.0 3. RECPT 3 * 930 2550 40:0 4. RECPT 4 * 950 2800 45.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * BRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 • 9 10 11 12 13 14 15 ----------•--*-------*-------* -------------------------------------- 7----------- ------------------------- 1. RECPT 1 * 101. * 3.4 * .0 .0 .1 .0 .5 .0 .0 .0 .0 .0 .0 .0 .0 - .0 .0 2. RECPT 2 * 163. * 2.9 * .1 .1 .0 .0 .6 .0 .0 .0 .0 :0 .0 .0 .0 .0 .0 3. RECPT 3 * 308. * 2.9 * .0 .1 .0 .0 .7 .0 .0 .0 .0 .A .0 :0 .61 .0 .0 4. RECPT 4 * 1 197. * 2.4 * .0 .2 .0 .0 1.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 * CONC/LINK * (PPM) RECEPTOR * 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 -1-*---.4---:2---:0---.0---.0---:'---.o---.O---.O --.Z --.2--:5---=3---.0---.0---.0---.0---.6---.1---.1 1. RECPT 2. RECPT 2 * .0 .9 .1 .0 .1 .1 .0 .0 .0 .01 .0 .0 .1 .4 .0 .0 .2 .1 .0 .0 3. RECPT 3 * .3 .0 .0 .0 .0 .0 .0 .D .0 .2 .0 .0 .3 .3 .2 .1 .2 .4 .0 .0 4. RECPT 4 * .0 .2 .5 .0 .0 .0 .0 .0 .0 .0 .0 .3 .0 .0 .0 .0 .0 .0 .1 .0 1 .5 SAN JOAQUIN BISON AVENUE (SJ25AMCV.DAT) 100. 0. 0. 4 0.304 1CO 28.0 1000.0 REC # 1 370. 2820. 5.0 REC # 2 370. 3050. 5.0 REC # 3 930. 2550. 40.0 REC # 4 950. 2800. 45.0 CONVENTIONAL AM (MAP 10/10) 35 0001-0002 BR 750. 1200. 750. 1450. 8450. 4.0 10. 92. 0002-OOR1 SR 750. 1450. 870. 2660. 500. 11.3 20. 44. 0OR2-OOR3 BR 850. 2720. 1060. 3600. 250. 11.3 20. 44. 0OR3-OOR4 SR 1060. 3600. 1260. 3980. 250. 11.3 15. 44. 0002-0003 AG 750. 1450. 740. 2810. 7950. 11.3 0. 92. 0003-OOR5 AG 740. 2810. 1080. 3980. 1825. 4.0 0. 44. 0003-0004 AG 740. 2810. 810. 3400. 6125. 4.0 0. 80. 0004-0005 BR 810. 3400. 970. 3980. 6125. 4.0 10. 80. 00H1-OOH2 AG 690. 1200. 670. 2620. 950. 3.7 0. 32. 0OH2-OOH3 AG 670. 2620. 750. 3350. 950. 3.7 0. 32. 0OH3-OOH4 BR 750. 3350. 930. 3980. 950. 3.7 10. 32. 0OH5-OOH6 BR 870. 3980. 710. 3450. 845. 3.7 10. 32. 0OH6-OOH7 AG 710. 3450. 620. 2770. 845. 3.7 0. 32. 00H7-00H8 AG 620. 2770. 640. 1200. 845. 3.7 0. 32. 0006-0007 BR 810. 3980. 650. 3390. 2225. 4.0 10. 56. 0007-0008 AG 650. 3390. 560. 2770. 1750. 4.0 0. 56. 0008-0009 AG 560. 2770. 580. 1740. 1975. 4.0 0. 56. 0009-0010 BR 580. 1740. 590. 1200. 2025. 6.0 10. 92. OR10-OOR9 BR 720. 3980. 610. 3740. 475. 11.3 10. 32. 0OR9-OOR8 SR 610. 3740. 420. 2930. 475. 11.3 20. 44. 0OR7-OOR6 BR 440. 2850. 420. 2660. 50. 11.3 20. 44. 0OR6-0009 BR 420. 2660. 580. 1740. 50. 11.3 10. 32. OR13-OR12 BR 620. 3980. 570. 3860. 225. 11.3 10. 44. OR12-OR11 BR 570. 3860. 530. 3620. 225. 11.3 10. 44. OR11-0008 AG 530. 3620. 560. 2770. 225. 11.3 0. 44. 0081-0062 SR 1750. 2610. 1350. 2610. 400. 21.9 30. 44. 0062-OOR2 BR 1350. 2610. 850. 2720. 400. 21.9 30. 44. 00R2-00R8 BISON SR 850. 2720. 420. 2930. 550. 21.9 30. 44. 0OR8-0063 BISON SR 420. 2930. 130. 3150. 950. 21.9 30. 44. 0083-00B4 BISON BR 130. 3150. -140. 3450. 950. 21.9 30. 44. 0085-0066 BISON BR -190. 3450. 80. 3150. 350. 21.9 30. 44. 0OB6-OOR7 BISON SR 80. 3150. 440. 2850. 350. 21.9 30. 44. 0OR7-OOR1 BISON BR 440. 2850. 870. 2660. 375. 21.9 30. 44. 0ORl-0087 BISON BR 870. 2660. 1350. 2560. 475. 21.9 30. 44. 0067-0088 BISON BR 1350. 2560. 1750. 2560. 475. 21.9 30. 44. .0071000. 0. 10. 8.0 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT -PARSONS BRINCKERHOFF QUADE L DOUGLAS, INC'. JOB: SAN'JOAQUIN BISON AVENUE (SJ2SPMCV.DAT) RUN: CONVENTIONAL AM (MAP 10/10) DATE: 04/28/1990 TIME: 14:10:57.91 ORIENTATION. N 'W+E SCALE : x-direction W-direction S 1 in.=113.8 m = 378.7 ft 1 in.=113.8 m = 370.7 ft CODE: link boundaries 58 m Be m * receptor location 1S4 ft iS4 ft L link label volume (veh./hour) I 1 1 1 1 El CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 VERSION PAGE 1 JOB: SAN JOAQUIN BISON AVENUE (SJ25PMCV.DAT) RUN: CONVENTIONAL (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S Z0= 100. CM ALT= 1000. (FT) BRG= WORST CASE VD= .0 CM/S CLAS= 7 (G) VS= .0 CM/S MIXH= 1000. M AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 750 1200 750 1450 * BG 4425 3.9 10.0 92.0 2. LINK 2 * 750 1450 870 2660 * BG 375 11.2 20.0 44.0 3. LINK 3 * 850 2720 1060 3600 * BG 750 11.2 20.0 44.0 4. LINK 4 * 1060 3600 1260 3980 * BG 750 11.2 15.0 44.0 5. LINK 5 * 750 1450 740 2810 * AG 4050 11.2 .0 92.0 6. LINK 6 * 740 2810 1080 3980 * AG 400 3.9 .0 44.0 7. LINK 7 * 740 2810 810 3400 * AG 3650 3.9 .0 80.0 8. LINK 8 * 810 3400 970 3980 * BG 3650 3.9 10.0 80.0 9. LINK 9 * 690 1200 670 2620 * AG 203 3.7 .0 32.0 10. LINK 10 * 670 2620 750 3350 * AG 203 3.7 .0 32.0 11. LINK 11 * 750 3350 930 3980 * BG 203 3.7 10.0 32.0 12. LINK 12 * 870 3980 710 3450 * BG 775 3.7 10.0 32.0 13. LINK 13 * 710 3450 620 2770 * AG 775 3.7 .0 32.0 14. LINK 14 * 620 2770 640 1200 * AG 775 3.7 .0 32.0 15. LINK 15 * 810 3980 650 3390 * BG 5275 3.9 10.0 56.0 16. LINK 16 * 650 3390 560 2770 * AG 4650 3.9 .0 56.0 17. LINK 17 * 560 2770 580 1740 * AG 6600 3.9 .0 56.0 18. LINK 18 * 580 1740 590 1200 * BG 6900 5.9 10.0 92.0 19. LINK 19 * 720 3980 610 3740 * BG 500 11.2 10.0 32.0 20. LINK 20 * 610 3740 420 2930 * BG 500 11.2 20.0 44.0 21. LINK 21 * "0 2850 420 2660 * BG 300 11.2 20.0 44.0 22. LINK 22 * 420 2660 580 1740 * BG 300 11.2 10.0 32.0 23. LINK 23 * 620 3980 570 3860 * BG 1950 11.2 10.0 44.0 24. LINK 24 * 570 3860 530 3620 * BG 1950 11.2 10.0 44.0 25. LINK 25 * 530 3620 560 2770 * AG 1950 11.2 .0 44.0 26. LINK 26 * 1750 2610 1350 2610 * BG 875 21.7 30.0 44.0 27. LINK 27 * 1350 2610 850 2720 * BG 875 21.7 30.0 44.0 28. LINK 28 * 850 2720 420 2930 * BG 650 21.7 30.0 44.0 29. LINK 29 * 420 2930 130 3150 * BG 1025 21.7 30.0 ".0 30. LINK 30 * 130 3150 -140 3450 * BG 1025 21.7 30.0 44.0 31. LINK 31 * -190 3450 80 3150 * BG 700 21.7 30.0 44.0 32. LINK 32 * 80 3150 440 2850 * BG 700 21.7 30.0 44.0 33. LINK 33 * 440 2850 870 2660 * BG 525 21.7 30.0 44.0 34. LINK 34 * 870 2660 1350 2560 * BG 375 21.7 30.0 44.0 35. LINK 35 * 1350 2560 1750 2560 * BG 375 21.7 30.0 44.0 PAGE 2 JOB: SAN JOAQUIN BISON AVENUE (SJ25PMCV.DAT) RUN: CONVENTIONAL (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X Y Z ------------*------------------ 1. RECPT 1 * 370 2820 5.0 2. RECPT 2,* 370 3050 5.0 3. RECPT 3 * 930 2550 40.0 4. RECPT 4 * 950 2800 45.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * BRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ------------- *------- *------- *----------------------------------------------------------- ---------------- 1. RECPT 1 * 101. * 3.4 * .0 .0 .1 .0 .6 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 2. RECPT 2 * 133. * 2.8 * .0 .1 .0 .0 .T .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 3. RECPT 3 * 308. * 2.9 * .0 .1 .0 .0 .7 .0 .0 .0 .0 .0 .0 -0 .0 .0 -0`'- 4. RECPT 4 * 198. * 2.2 * .0 .2 .0 .0 1.1 .0 .0 .0 .0 .0 .0 .0 :0 .1 .0 * CONC/LINK * (PPM) RECEPTOR * 16 17 18 19 20 21 22, 23 24 25 26 28 29 30 31 .32 33 34 35 ------------ ---- ---------.3----- -27 ----.U--- -- - - -- ---.1----1 *--------=----:0---:0---:0-------- 1. RECPT 1 .2 .5---.3--- 2. RECPT 2 * .3 .0 .0 .0 .1 .0 .0 .0 .0 .5 .0 .0 .6 .0 .0 .0 .0 .3 .0 .0 3. RECPT 3 * .2 .0 .0 .0 .0 .0 .0 .0 .0 .3 .0 .0 .3 .3 .2 .1 .2 .4 .0 .0 4: RECPT 4 * .0 .1 .3 .0 .0 .0 .0 .0 .0 .0 .0 .3 .0 .0 .0 .0 .0 .0 .1 -0 1 1 1 1 1 SJ UNIV. DR INTERCHG (SJ27AMCV.OAT) 100. 0. 0. 2 0.3048 1C0 28.0 REC # 1 140. 1270. 5.0 REC # 2 40. 760 5.0 CONSERVATIVE AM (MAP 10/10) 51 0001-0002 SJ NB BR 440. 0. 500. 2100. 6650. 4.0 30. 80. 0002-0004 BR 500. 2100. 500. 2500. 1325. 11.3 30. 32. 0004-0006 BR 500. 2500. 370. 3000. 1325. 11.3 30. 32. 0002-0008 SJ NB BR 500. 2100. 270. 3000. 5525. 4.0 25. 68. 0009-0010 HOV BR 370. 0. 430. 1850. 750. 3.7 30. 44. 0010-0012 HOV BR 430. 1850. 180. 3000. 750. 3.7 10. 44. 0013-0015 SJ SB FL 110. 3000. 280. 2370. 2375. 4.0 10. 56. 0015-0016 SJ SS BR 280. 2370. 320. 1850. 2375. 4.0 20. 56. 0016-0017 SJ SS BR 320. 1850. 280. 0. 2650. 4.0 30. 56. 0018-0019 FL 30. 3000. 120. 2820. 275. 11.3 20. 44. 0019-0016 FL 120. 2820. 320. 1850. 275. 11.3 20. 32. 0022-0024 FL 20. 3000. 80. 2430. 425. 11.3 10. 44. 0025-0026 AG 80. 2410. 190. 1450. 50. 11.3 0. 44. 0027-0029 AG 200. 1380. 230. 470. 50. 11.3 0. 44. 0029-0030 BR 230. 470. 180. 0. 50. 11.3 10. 44. 0031-0032 MAC BR 580. 0. 590. 200. 2050. 21.9 20. 56. 0032-0033 MAC BR 590. 200. 870. 1220. 2050. 21.9 20. 56. 0033-0034 MAC BR 870. 1220. 940. 1750. 2050. 21.9 20. 56. 0034-0035 MAC BR 940. 1750. 910. 2240. 2200. 21.9 20. 56. 0035-0036 MAC BR 910. 2240. 800. 2650. 2200. 21.9 30. 56. 0039-0041 MAC BR 650. 0. 650. 200. 4350. 21.9 20. 56. 0041-0042 MAC BR 650. 200. 920. 1210. 3350. 21.9 20. 56. 0042-0043 MAC BR 920. 1210. 990. 1700. 3350. 21.9 20. 56. 0043-0044 MAC BR 990. 1700. 940. 2650. 5250. 21.9 20. 56. 0040-0048 X RAMP BR 650. 200. 1230. 860. 1000. 11.3 30. 32. 0050-0051 FL 1230. 860. 1300. 1010. 1000. 11.3 10. 44. 0051-0052 FL 1300. 1010. 1350. 1430. 1000. 11.3 5. 44. 0053-0054 UNIV N AG 1180. 2240. 80. 2430. 1000. 21.9 0. 44. 0055-0056 UNIV N AG 1180. 2220. 80. 2410. 1300. 21.9 0. 44. 0057-0058 UNIV S AG -80. 1350. 190. 1450. 700. 21.9 0. 44. 0058-0059 UNIV S AG 190. 1450. 600. 1530. 700. 21.9 0. 44. 0059-0061 UNIV S AG 600. 1530. 1325. 1490. 700. 21.9 0. 44. OOAA-OOBB AG 1325. 1490. 1390. 1490. 700. 21.9 0. 44. 0062-0063 UNIV S AG -60. 1290. 200. 1380. 800. 21.9 0. 44. 0063-0064 UNIV S AG 200. 1380. 640. 1460. 800. 21.9 0. 44. 0064-0052 UNIV S AG 640. 1460. 1350. 1420. 800. 21.9 0. 44. 0065-0067 AG 950. 1450. 610. 1370. 150. 17.6 0. 32. 0067-0068 FL 610. 1370. 550. 1310. 150. 17.6 10. 32. 0068-0069 BR 550. 1310. 530. 1220. 150. 17.6 10. 32. 0069-0070 BR 530. 1220. 590. 1140. 150. 17.6 20. 32. 0070-0071 BR 590. 1140. 670. 1110. 150. 17.6 20. 32. 0071-0072 BR 670. 1110. 770. 1140. 150. 17.6 20. 32. 0072-0073 BR 770. 1140. 820. 1220. 150. 17.6 30. 32. 0073-0034 BR 820. 1220. 940. 1750. 150. 17.6 30. 32. 0066-0074 AG 1320. 1430. 1260. 1040. 1900. 17.6 0. 32. 0074-0075 AG 1260. 1040. 1230. 960. 1900. 17.6 0. 32. 0075-0076 AG 1230. 960. 1150. 910. 1900. 17.6 0. 32. 0076-0077 FL 1150. 910. 1050. 920. 1900. 17.6 10. 32. 0077-0078 FL 1050. 920. 970. 980. 1900. 17.6 20. 32. 0078-0079 BR 970. 980. 950. 1060. 1900. 17.6 20. 32. 0079-0043 BR 950. 1060. 990. 1700. 1900. 17.6 30. 32. .5 .0071000. 0. 10.0 8.0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. JOB: SJ'UNIV. OR INTERCHG (SJ2?AM.DAT) RUN: CONSERVATIVE AM (MAP 10/10) DATE: 01/30/1990 TIME: 10:08:56.82 ORIENTATION: N W SCALE x-direction W-direction S 1 in.=121.4 m = 398.2 ft 1 in.=121.4 m = 398.2 ft CODE: link boundaries 58 m Be m * receptor location 164 ft 164 ft L link label volume Wah./hour) N1 275. I L 3 L1L ? l_ 25. 2375. 1 t 5250. 9?51300. L13 t0. /L30 L 31 L4 L 1 2 6325. L14- 9L 5 l2668 . .,a a. ea. 0. L4 'L36 L51 45? 3 1900. L50 ,L46 L49 ,_L4847 26 L 3000. 1 00. leas. CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 VERSION PAGE 1 JOB: SJ UNIV. DR INTERCHG (SJ27AMCV.DAT) RUN: CONSERVATIVE (WORST CASE ANGLE) POLLUTANT: CO I. SITE VARIABLES U= .5 M/S ZO= 100. CM ALT= 0. (FT) BRG= WORST CASE VD= .0 CM/S CLAS= 7 (G) VS= .0 CM/S MIXH= 1000. M AMB= .0 PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C) II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF H W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 440 0 500 2100 * BG 6650 4.0 30.0 80.0 2. LINK 2 * 500 2100 500 2500 * BG 1325 11.3 30.0 32.0 3. LINK 3 * 500 2500 370 3000 * BG 1325 11.3 30.0 32.0 4. LINK 4 * 500 2100 270 3000 * BG 5525 4.0 25.0 68.0 5. LINK 5 * 370 0 430 1850 * BG 750 3.7 30.0 44.0 6. LINK 6 * 430 1850 180 3000 * BG 750 3.7 10.0 44.0 7. LINK 7 * 110 3000 280 2370 * FL 2375 4.0 10.0 56.0 8. LINK 8 * 280 2370 320 1850 * BG 2375 4.0 20.0 56.0 9. LINK 9 * 320 1850 280 0 * BG 2650 4.0 30.0 56.0 10. LINK 10 * 30 3000 120 2820 * FL 275 11.3 20.0 44.0 11. LINK 11 * 120 2820 320 1850 * FL 275 11.3 20.0 32.0 12. LINK 12 * 20 3000 80 2430 * FL 425 11.3 10.0 44.0 13. LINK 13 * 80 2410 190 1450 * AG 50 11.3 .0 44.0 14. LINK 14 * 200 1380 230 470 * AG 50 11.3 .0 44.0 15. LINK 15 * 230 470 180 0 * BG 50 11.3 10.0 44.0 16. LINK 16 * 580 0 590 200 * BG 2050 21.9 20.0 56.0 17. LINK 17 * 590 200 870 1220 * BG 2050 21.9 20.0 56.0 18. LINK 18 * 870 1220 940 1750 * BG 2050 21.9 20.0 56.0 19. LINK 19 * 940 1750 910 2240 * BG 2200 21.9 20.0 56.0 20. LINK 20 * 910 2240 800 2650 * BG 2200 21.9 30.0 56.0 21. LINK 21 * 650 0 650 200 * BG 4350 21.9 20.0 56.0 22. LINK 22 * 650 200 920 1210 * BG 3350 21.9 20.0 56.0 23. LINK 23 * 920 1210 990 1700 * BG 3350 21.9 20.0 56.0 24. LINK 24 * 990 1700 940 2650 * BG 5250 21.9 20.0 56.0 25. LINK 25 * 650 200 1230 860 * BG 1000 11.3 30.0 32.0 26. LINK 26 * 1230 860 1300 1010 * FL 1000 11.3 10.0 44.0 27. LINK 27 * 1300 1010 1350 1430 * FL 1000 11.3 5.0 44.0 28. LINK 28 * 1180 2240 80 2430 * AG 1000 21.9 .0 44.0 29. LINK 29 * 1180 2220 80 2410 * AG 1300 21.9 .0 44.0 30. LINK 30 * -80 1350 190 1450 * AG 700 21.9 .0 44.0 31. LINK 31 * 190 1450 600 1530 * AG 700 21.9 .0 44.0 32. LINK 32 * 600 1530 1325 1490 * AG 700 21.9 .0 44.0 33. LINK 33 * 1325 1490 1390 1490 * AG 700 21.9 .0 44.0 34. LINK 34 * -60 1290 200 1380 * AG 800 21.9 .0 44.0 35. LINK 35 * 200 1380 640 1460 * AG 800 21.9 .0 44.0 36. LINK 36 * 640 1460 1350 1420 * AG 800 21.9 .0 44.0 37. LINK 37 * 950 1450 610 1370 * AG 150 17.6 .0 32.0 PAGE 2 JOB: RUN: SJ CONSERVATIVE UNIV. DR INTERCHG (SJ27AMCV.DAT) (WORST CASE ANGLE) POLLUTANT: CO 38. LINK 38 * 610 1370 550 1310 * FL 150 17.6 10.0 32.0 39. LINK 39 * 550 1310 530 1220 * BG 150 17.6 10.0 32:0 40. LINK 40 * 530 1220 590 1140 * BG 150 17.6 20.0 32.0 41. LINK 41 * 590 1140 670 1110 * BG 150 17.6 20.0 32.0 42. LINK 42 * 670 1110 770 1140 * BG 150 17.6 20.0 32.0 ' 43. LINK 43 * 770 1140 820 1220 * BG 150 17.6 30.0 32.0 44. LINK 44 * 820 1220 940 1750 * BG 150 17.6 30.0 32.0 45. LINK 45 * 1320 1430 1260 1040 * AG 1900 17.6 .0 32.0 46. LINK 46 * 1260 1040 1230 960 * AG 1900 17.6 .0 32.0 47. LINK 47 * 1230 960 1150 910 * AG 1900 17.6 .0 32.0 48. LINK 48 * 1150 910 1050 920 * FL 1900- 17.6 10.0 32.0 ' 49. 50. LINK LINK 49 50 * * 1050 970 920 980 970 950 980 * 1060 * FL BG 1900 1900 17.6 17.6 20.0 20.0 32.0 32.0 51. LINK 51 * 950 1060 990 1700 * BG 1900 17.6 30.0 32.0 I LI 1 1 PAGE 3 JOB: SJ UNIV. DR INTERCHG (SJ27AMCV.DAT) RUN: CONSERVATIVE (WORST CASE ANGLE) POLLUTANT: CO III. RECEPTOR LOCATIONS * COORDINATES (FT) RECEPTOR * X Y Z ------------ --------------------- 1. RECPT 1 * 140 1270 5.0 2. RECPT 2 * 40 760 5.0 IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * BRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ------------- *------- *------- *--------------------------------------------------------------------------- 1. RECPT 1 * 42. * 3.8 * .3 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .0 .0 .0 .0 2. RECPT 2 * 34. * 3.0 * .3 .0 .0 .0 .1 .0 .0 .0 .2 .0 .0 .0 .0 .0 .0 * CONC/LINK * (PPM) -RECEPTOR * 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 3 ---*-------------------------------------------------------------------------------------------------- 1. RECPT 1 * .0 .0 .0 .4 .1 .0 .0 .0 1.0 .0 .0 .0 .2 .3 .0 .5 .0 .0 .0 2. RECPT 2 * .0 .0 .0 .4 .1 .0 .0 .0 .9 .0 .0 .0 .2 .2 .0 .2 .1 .0 .0 , * CONC/LINK * (PPM) RECEPTOR * 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 ------------ -------------------------------------------------------------------------------- 1. RECPT 1 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 2. RECPT 2 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 APPENDIX B PARK AND RIDE SAMPLE RESULTS p 1 I I04/25/90(TCA901A) 33 The following information was used for the parking lot analysis: Traffic: AM peak = 2 hours, with a 55/45 percent split PM peak = 3 hours, with a 35/33/32 percent. split ' Number of buses = Number of transit passengers 40 passengers per bus Assume: 375 sq/ft. parking space + 20% for circulation + 2'0% for bus parking and circulation All vehicles are assumed to be hot stabilized. Average distance travelled = 1/2 length of lot Average speed in lot = 5 mph Cars idle for 60 seconds due to warm-up, back-up and exit queue. ' Emissions are based on a composite of autos and buses. Volumes are distributed evenly among links in -the lot. ' Sample Park and Ride analysis: Crown Valley Parkway - Greenfield Drive AM peak hour = 430 (HOV) * 55% = 237 280 transit passengers=7 buses * 55% = 4 buses 40 passengers per bus Number of cars that remain parked = 285 - 161 (HOV) 124 (tr) ' 55% = 157 spaces - 89 HOV and 68 transit Number of cars exiting facility = 148 cars and 4 buses Total entering = 305 vehicles and 4 buses Total exiting - 148 vehicles and 4 buses Total Square footage = 285 spaces required * 375 ft/space = 106,875 ft * 20%(cir) * 20%(bus) = 149,625 ft = 387' x 387 ' square 1 1 [l I 1 Ln mr eti M � d d C O C el! d C) it cC d C) O •E Q1•i th M r-•r N .-•1 O a c x c C N C• O .0+� +� O O C Q OA. � Jbd L o ec U i E ev O u eLe) O a� Ln M Mco i0 .1 000 to i >> t� m i r 0 N. N rr O C1r— a) ep O +1 C •r V 'O C 'C d - '0 cm r 1= W N +� a CLm C1 O C d L d •� C V (A et CO 00 co Ln C 'C O r- 41 U tv •O a etf eO c N O M n•r 1d O 41 -hL 10 L. L. I d m wl L. CL r i S. i V d O CLu 'C C1 O G. C Ci a i N C L +1 O � Ln Yu Y 4-) u .a E u cN0 L m Pft. O b rn COV O S C L ?I \ Q• O O R7 .r d O t to N -W ' Ln ••� C) r N 4. 4• � d •r- L d\ E +1 LO *k ZA O O N •^ Q1 c E cn N N a) 4-J O tv O 4) E O E++ OL v i H O S. O L.64--) M w C NL. •� S" L. 41 C) Q CL Q m Q +� O • IT N 4) tQ �.► N c M M LO M Ln ; .1 u Oki W L H Cri M rr 1 I 1 Z N N E tZ O v c O co C%j CD N M N M SO. CD co Ln ka cm c > ...i m V N N ; O N N V •r• N ed �► m m d) C) C) I•� r cm O •p n� a a. E rn C O N t0 n _ r— S. O c rt L PH t0 H N CMN M r 0 •� O�?Lb V� a 'CC) m Oct 2 H O. 4- E cci A C 41.o NO01 �w u �u u E ait O O � O N O C ev ; i d C) �.+ t ; O r— Cii c� Q •� fn .-. N O d +.i er N •-r C C) • • 4) > W u G > O O O d 0 41 O C) v O eo 10 ••- r p e0 'G 41 L b E C •i E •N ta0 • • a) Iv C V 'C L O u ,O 4-1 C) 'fl d M .Y C O d N 4.4 t•.) CA S. ~ a a �OiE. Oi 4- QL O i a O 3 N 'fl O� O C Cii C C O C tv r— -)d L r e0 Vf r C) r !C �1 - r— O N +� .G 4.4 1 •.� S. +� G c = C A Q V u -W fY 41 O U bC O O O L b L ei o tO +•r e0 4.) S- A eo 'V eo L o LL E LIB CL LA- ed Li- CL d 3 '0 O N c u L u o •,- e0 O J LIJ LA- V 1 1 �•�•. 1 1 H SAN JOAQUIN GREENFIELD DR. (SJ9AM.DAT) 100. 0. 0. 8 0.3048 1C0 28.0 ' REC #1 1860. 1280. 5.0 REC #2 1710. 1340. 5.0 REC #3 1790'. 880. 5.0 REC #4 1620. 880. 5.0 REC #5 PARK 1390. 800. 5.0 REC #6 PARK 1340. 480. 5.0 REC #7'PARK 1440. 400. 5.0 REC #S PARK 1820. 540. 5.0 CONSERVATIVE AM DR(MAP 4/10) 39 0001-0002 FL 470. 1300. 780. 1160. 775.11.3 30. 32. 0002-0003 FL 780. 1160. 1100. 1060. 775.11.3 30. 32. _ ' 0003-0005 FL 1100. 1060. 1700. 940. 775.11.3 30. 32. 0010-0009 FL 490. 1380. 780. 1260. 4325. 6.0 30. 56. 0009-0008 FL 780. 1260. 1100. 1160. 4325. 6.0 30. 56. 0008-0007 '0007-0037 BR BR 1100. 1700. 1160. 1050. 1700. 2760. 1050. 840. 4325. 6.0 4325. 6.0 25. 10. 56. 56. 0037-0036 DP 2760. 840. 2960. 780. 4325. 6.0-10. 56. 0011-0012 FL 510. 1440. 780. 1320. 4.75. 3.7 30. 44. 0012-0013 FL 780. 1320. 1100. 1240. 475. 3.7 30. 44. 0013-0014 BR '1100. 1240. 1710. 1110. 475. 3.7 30. 44. 0014-0034 BR 1710. 1110. MO. 910. 475. 3.7 10. 44. 0034-0035 DP 2780. 910. 2980. 840. 475. 3.7-10. 44. 0018-0017 FL 525. 1500. 780. 1390. 1300. 4.0 30. 56. 0017-0016 FL 780. 1390. 1100. 1290. 1300. 4.0 30. 56. 0016-0015 BR 1100. 1290. 1720. 1170. 1300. 4.0 25. 56. 0015-0032 SR 1720. 1170. 2780. 970. 1300. 4.0 10. 56. 0032-0033 DP 2780. 970. 3000. 900. 1300. 4.0-10. 56. 0019-0020 FL 540. 1550. 780. 1450. 500.11.3 30. 32. 0020-0021 FL 780. 1450. 1100. 1390. 500.11.3 30. 32. 0021-0022 FL 1100. 1390. 1760. 1260. 500.11.3 30. 32. 0025-026A AG 1610. 260. 1740. 926. 175.21.9 0. 44. 026A-0026 AG 1740. 920. 1800. 1260. 125.21.9 0. 44. 0026-0027 AG 1800. 1260. 1860. 1440. 575.21.9 0. 44. 0027-0028 AG 1860. 1440. 1960. 1580. 575.21.9 0. 44. ' 0028-0029 AG 1960. 1580. 2140. 2000. 575.21.9 0. 44. 0030-0031 AG 2100. 2000. 1930. 1600. 950.21.9 0. 44. 0031-0038 AG 1930. 1600. 1820. 1450. 950.21.9 0. 44. 0038-0022 AG 1820. 1450. 1760. 1260. 950.21.9 0. 44. 0022-0005 AG 1760. 1260. 1700. 940. 1000.21.9 0. 44. 0005-0040 AG 1700. 940. 1560. 260. 275.21.9 0. 44. ' 0001-0002 PARK 1 0003-0004 PARK 1 PK PK 1900, 1890. 580. 630. 1740. 1760. 620. 660. 31.68.6 31.68.6 0. 0. 12. 12. 0005-0006 PARK 1 PK 1880. 680. 1765. 710 31.68.6 0. 12. 0007-0008 PARK 1 PK 1890. 730. 1770. 750. 31.68.6 0. 12. 0009-0010 PARK 1 PK 1910. 780. 1790. 800. 31.68.6 -0. 12. 0011-0012 PARK 2 PK- 1375. 430. 1460. 890. 102.68.6 0. 12. 0013-0014 PARK 2 PK 1430. 420. 1520. 880. 102.68.6 0. 12. 0015-0016 PARK 2 PK 1480. 415. 1560. 870. 103.68.6 0. 12. -5 0.071000. 0.0 10.0 8.0 1 1 ****CALINE4 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. JOB: SAN JOAQUIN GREENFIELD DR. (SJOAM.DAT) RUN: CONSERVATIVE AM DR(MAP 4/10) N DATE: 84/26/1990 TIME: 13:39:54.62 ORIENTATION: W+E SCALE x-direction W-direction S 1 in.=102.4 m = 336.8 ft 1 in.=182.4 m = 336.0 ft CODE: link boundaries 68 m 68 m * receptor location 164 ft 164 ft L link label volume (veh./hour) LIS 0 . �L: 8 �L476. �4�326 L 1 776. 1 CALINE4: CALIFORNIA LINE SOURCE DISPERSION MODEL JUNE 1989 PAGE 1 VERSION JOB: SAN JOAQUIN GREENFIELD DR. (SJ9AM.DAT) RUN: CONSERVATIVE (WORST CASE ANGLE) POLLUTANT: CO 1. SITE VARIABLES U= .5 M/S ZO= 100. CM ALT= 0. (FT) BRG= WORST CASE VD= .0 CM/S CLAS= 7 MIXH= 1000. (G) M VS= .0 AMB= .0 CM/S PPM SIGTH= 10. DEGREES TEMP= 8.0 DEGREE (C), II. LINK VARIABLES LINK * LINK COORDINATES (FT) * EF A W DESCRIPTION * X1 Y1 X2 Y2 * TYPE VPH (G/MI) (FT) (FT) ---------------- *------------------------- *------------------------------ 1. LINK 1 * 470 1300 780 1160 * FL 775 11.3 30.0 32.0 2. LINK 2 * 780 1160 1100 1060 * FL 775 11.3 30.0 32:0 ' 3. 4. LINK 3 LINK 4 * * 1100 490 1060 1380 1700 780 940 * 1260 * FL FL 775 4325 11.3 6.0 30.0 30.0 32.0 56.0 5. LINK 5 * 780 1260 1100 1160 * FL 4325 6.0 30.0 56.0 6. LINK 6 * 1100 1160 1700 1050 * BG 4325 6.0 25.0 56.0 7. 8. LINK 7 LINK 8 * * 1700 2760 1050 840 2760 2960 840-* 780 * BG DP 4325 4325 6.0 6.0 10.0 -10.0 56.0 56.0 9. LINK 9 * 510 1440 780 1320 * FL 475 3.7 30.0 44.0 10. LINK 10 * 780 1320 1100 1240 * FL 475 3.7 30.0 44.0 11. LINK 11 * 1100 1240 1710 1110 * BG 475 3.7 30.0 - 44.0 12. LINK 12 * 1710 1110 2780 910 * BG 475 3.7 10.0 44.0 13. LINK 13 * 2780 910 2980 840 * DP 475 3.7 -10.0 44.0 14. LINK 14 * 525 1500 780 1390 * FL 1300 4.0 30.0 56.0 15. LINK 15 * 780 1390 1100 1290 * FL 1300 4.0 30.0 56.0 16. LINK 16 * 1100 1290 1720 1170 * BG 1300 4.0 25.0 56.0 17. LINK 17 * 1720 1170 2780 970 * BG 1300 4.0 10.0 56.0 18- 19. LINK 18 LINK 19 * * 2780 540 970 1550 3000 780 900 * 1450 * DP FL 1300 500 4.0 11.3 -10*0 30.0 56-0 32.0 20. LINK 20 * 780 1450 1100 1390 * FL 500 11.3 30.0 32.0 21. LINK 21 * 1100 1390 1760 1260 * FL 500 11.3 30.0 32.0 ' 22. 23. LINK 22 LINK 23 * * 1610 1740 260 920 1740 1800 920 * 1260 * AG AG 175 125 21.9 21.9 .0 .0 44.0 44.0 24. LINK 24 * 1800 1260 1860 1440 * AG 575 21.9 .0 ".0 25. LINK 25 * 1860 1440 1960 1580 * AG 575 21.9 .0 44.0 26. LINK 26 * 1960 1580 2140 2000 * AG 575 21.9 .0 44.0 27. LINK 27 * 2100 2000 1930 1600 * AG 950 21.9 .0 ".0 28. LINK 28 * 1930 1600 1820 1450 * AG '950 21.9 .0 44.0 29. 30. LINK 29 LINK 30 * * 1820 1760 1450 1260 1760, 1700 1260 * 940 * AG AG 950 1000 21.9 21.9 .0 .0 ".0 44.0 31. LINK 31 * 1700 940 1560 260 * AG 275 21.9 .0 ".0 32. LINK 32 * 1900 580 1740 620 * PK 31 68.6 .0 12.0 33. 34. LINK 33 LINK 34 * * 1890 1880 630 680 1760 1765- 660 * 710 * PK PK 31 31 68.6 68.6 .0. .0 12.0 12.0 35. LINK 35 * 1890 730 1770 '750 * PK 31 68.6 .0 12.0 36. LINK 36 * 1910 780 1790 800 * PK 31 68.6 .0 12.0 37. LINK 37 * 1375 430 1460 890 * PK 102 68.6 .0 12.0 1 PAGE 2 JOB: SAN JOAQUIN GREENFIELD DR. (SJ9AM.DAT) RUN: CONSERVATIVE (WORST CASE ANGLE) POLLUTANT: CO 38. LINK 38 * 1430 420 1520 880 * PK 102 68.6 .0 12.0 39. LINK 39 * 1480 415 1560 870 * PK 103 68.6 .0 12.0 I I I � I � I � I � I � I I I � 1 PAGE 3 JOB: SAN JOAOUIN GREENFIELD DR. (SJ9AM.DAT) ' RUN: CONSERVATIVE (WORST CASE ANGLE) POLLUTANT: CO 1 III. RECEPTOR LOCATIONS * COORDINATES (FT) ' --RECEPTOR- * X Y 2 -*--------------------- 1. RECPT 1 * 1860 1280 5.0 2. RECPT 2 * 1710 1340 5.0 3. RECPT 3 * 1790 880 5.0 4. RECPT 4 * 1620 880 5.0 5. RECPT 5 * 1390 800 5.0 6. RECPT 6 * 1340 480 5.0 7. RECPT 7 * 1440 400 5.0 8. RECPT 8 * 1820 540 5.0 I IV. MODEL RESULTS (WORST CASE WIND ANGLE ) * * PRED * CONC/LINK * 'SRG * CONC * (PPM) RECEPTOR * (DEG) * (PPM) * 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ------------- *------- *....... *--------------------------------------------------------------------------- 1. RECPT 1 * 213. * 2.6 * .0 .0 .1 .0 .0 .1 .2 .0 .0 .0 .0 :0 .0 .0 .0 2. RECPT 2 * 171. * 2.3 * .0 .0 .0 .0 .0 .0 .3 .0 .0 .0 .0 .0 .0 .0 .0 3. RECPT 3 * 296. * 2.0 * .0 .0 .5 .1 .1 .5 .0 .0 .0 .0 .0 .0 .0 .0 .1 4. RECPT 4 * 24. * 3.3 * .0 .0 .3 A .0 .2 .2 .0 .0 .0 .0 .0 .0 .0 .0 5. RECPT 5 * 37. * 2.1 * .0 .0 .2 .0 .0 .3 .0 .0 .0 .0 ' 6. RECPT 6 * 31. * 3.1 * .0 .0 .1 .0 .0 .1 .1 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 7. RECPT 7 * 359. * 2.8 * .0 .0 .1 .0 .0 .2 .0 .0 .0 .0 .0 .0 .0 .0 .0 B. RECPT 8 * 357. * 1.7 * .0 .0 .0 .0 .0 .0 .3 .0 .0 .0 .0 .0 .0 .0 .0 * CONCAINK * (PPM) RECEPTOR * 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 3 ------------ -------------------------------------------------------------------------------------------------- 1. RECPT 1 * .0 .1 .0 .0 .0 .0 '.0 .2 .0 .0 .0 ' .0 .0 .0 .9 .0 .0 .0 .0 2. RECPT 2 * .0 .1 .0 .0 .0 .2 .0 .1 .0 .0 .0 .0 .0 .0 1.2 .0 .0 .0 .0 3. RECPT 3 * .0 .0 .0 .0 .0 .0 .2 .0 .0 .0 .0 .0 .0 .0 .1 .2 .0 .0 .0 4. RECPT 4 * .0 .1 .0 .0 .0 .0 .0 .1 .2 .1 .2 .3 .2 .3 1.0 .0 .0 .0 .0 5. 6. RECPT RECPT 5 * 6 * .1 .0 .0 .0 .0 .0 .0 .0 1.0 .0 .1 .0 .0 .0 .0 .1 .2 .1 .1 .1 .2 .1 .2 .1 .1 .1 .3 .1 .2 .4 .0 .0 .0 .0 .0 .0 .0 .0 7. RECPT 7 * .1 .0 .0 .0 .0 .1 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 8. RECPT 8 * .0 .1 .0 .0 .0 .0 .0 .1 .1 .0 .0 .0 .1 .2 .3 .0 .1 .1 .1 * CONC/LINK * (PPM) ' RECEPTOR * 36 37 38 39 1. 2. RECPT RECPT 1 * 2-* .0 .0 .2 .3 .0 .0 .3 .0 3. RECPT 3 * .0 .0 .0 .0 4. RECPT 4 * .0 .0 .0 .0 5. 6. RECPT RECPT 5 * 6 * .0 .0 .3 .0 .8 .5 .0 .3 7. RECPT 7 * .0 .6 1.8 .0 8. RECPT 8 * .1 .0 .0 .0 1 1 1 1 1 1 J 1 1 1 1 1 1 1 b4e'ofCi ? Jam,r : r CITY OF NEWPOPT-BEACH PLANNING'DEPARTMENT 3300 NEWPORT BOULEVARD NEWPORT BEACH BOX 1768 CALIFORNIA 92659-1768 SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR DRAFT ENVIRONMENTAL IMPACT REPORT/' ENVIRONMENTAL IMPACT STATEMENT TECHNICAL REPORT NO. 4 NOISE IMPACT STUDY �( SAN JOAQUIX HILLS TRANSPORTATION CORRIDOR INTERSTATE 5 TO JAMBOREE ROAD ORANGE COUNTY, CALIFORNIA NOISE IMPACT TECHNICAL REPORT July 1990 1 A 1 Prepared for: The Transportation Corridor Agency 345 Clinton Street Costa Mesa, California 92626-6011 Prepared by: CORRIDOR DESIGN MANAGEMENT GROUP 345 Clinton Street Costa Mesa, California 92626-6011 (714) 557-0330 f G I 1 I 1 1 1 TABLE OF CONTENTS Pacre i . List of Tables ii. List of Illustrations 1.0 INTRODUCTION 1 2.0 NOISE DESCRIPTORS 2 3.0 EXISTING NOISE LEVELS 3 4.0 TRAFFIC NOISE PREDICTION METHODOLOGY 5 5.0 ORANGE COUNTY NOISE IMPACT ASSESSMENT 6 6.0 FHWA NOISE IMPACT ASSESSMENT 17 7.0 NOISE BARRIER ANALYSIS 28 8.0 CONSTRUCTION NOISE 31 REFERENCES APPENDICES A. Stamina Noise Model: Conventional and Demand Management Alternatives Sample Noise Predictions B. Stamina Noise Model: Sample Barrier Analysis C. Design Year 2010 Traffic Data LIST OF TABLES Table Pacre 1 Measured Existing Noise Levels 4 2 Orange County Compatibility Matrix for 7 Land Uses and Community Noise Equivalent Levels (CNEL) 3 California Noise -Compatible Land Use 8 Guidelines 4 Distance to CNEL Noise Contours 9 5 - Predicted 2010 Traffic Noise Levels- 11 CNEL (dBA) Orange County Assessment 6 Orange County Noise Abatement Locations 13 7 Change in Noise Levels on Arterial Roadways 16 8 FHWA Noise Abatement Criteria 18 9 Distance To Leq=67 dBA Noise Contour 20 10 Predicted 2010 Traffic Noise Levels- 21 Leq (dBA) FHWA Assessment 11 FHWA Building Noise Reduction Values 23 12 Interior Land Use Noise Levels 24 13 FHWA Noise Abatement Locations 26 1 11 ILIST OF FIGURES Figure Following Page 1 Project Location 1 2 Typical A -Weighted Noise Levels 2 3 Typical Outdoor CNEL Noise Levels 2 4 Noise Modeling Sites 3 5 Aircraft Noise Contours from MCAS E1 Toro and John Wayne Airport 3 6 Aircraft Noise Contours from MCAS E1 Toro 3 7 CNEL Noise Contour Map 6 8 Orange County Standard Conditions of Approval 10 9 Local Arterial Roadways 15 10 Leq= 67 dBA Noise Contour Map 20 it Noise Barrier Locations 28 12 Construction Equipment Noise 31 fl 1 'I 1 Ll 1.0 INTRODUCTION The San Joaquin Hills Transportation Corridor SJHTC is the q P ( ) Proposed extension of the SR-73 Freeway from the I-5 Freeway in the City of San Capistrano to Jamboree Road in the City of Newport Beach. The Corridor also passes through the cities of Irvine, Laguna Beach and unincorporated areas of Orange County (Figure 1). The proposed project consists of two alternatives: Conventional Operations and Demand Management Operations. Both alternatives would follow the same alignment, extending State Route 73 from I-5 to Jamboree Road. The Conventional Alternative would provide four general purpose lanes in each direction, one HOV lane in each direction, a toll system., and reservation of a 64-foot median for future expansion. The Demand Management Alternative would provide three general purpose lanes in each direction, two reversible HOV lanes, a toll system, and reservation of an 88-foot median for additional capacity as warranted. The construction of the Corridor would be phased with initial -construction of three mixed flow lanes all toll facilities expected to be completed by 1995. The proposed toll collection is a closed barrier system which includes one mainline toll plaza near the Sand Canyon Avenue interchange and 12 ramp toll plazas on only one side of selected interchanges. The mainline barrier and general interchange ramp toll plazas will include a combination of manual and Automatic Vehicle Identification (AVI) collection. systems. The AVI system would read an -active or passive transponder located in a vehicle at speeds of up to 100 mph with 99.9 percent read accuracy. The SJHTC will be operated as a toll system until the Bonds, issued to finance construction, are retired at which time it would be converted to a Freeway. The noise impact analyses are based on toll free traffic which would result in the highest traffic noise levels. 1 r 1 San Los Angeles Co. 57 M San Bernardino Co. t 9 91 Riverside Co. 1 ' EASTERN 5 55 1..*-TRANSPORTATION CORRIDOR 22 USMC Tustin 39 �. 73 Cleveland National / USMC `� Forest El Toro \ �wey + ` i FOOTHILL TRANSPORTATION .T "•�� : CORRIDOR :• ` + SAN JOAQUIN• HILLS '•- TRANSPORTATION. CORRIDO. ' 74 0 1 2 3 a S 6 7miles Orange County ' / San Diego Co. PROJECT LOCATION FIGURE 1 1 2.0 NOISE DESCRIPTORS community noise is described in terms of the dBA noise level. It is measured with a Sound Level Meter, using the A- weighting filter to simulate the frequency response of the human ear. The Leq or "equivalent noise level" is the average noise level on an energy basis for any specified time period. It is the continuous dBA level that would have produced the same A -weighted sound energy as the actual noise history for that time period. Examples of various noise sources and their typical A -weighted noise level are presented in Figure 2. The County of Orange and the FHWA have two different rating scales for measurement of community noise. The predominant rating scale now in use,in California for land use compatibility assessment is the Community Noise Equivalent Level (CNEL). The CNEL scale represents a time weighted 24 hour average noise level based on the A -weighted decibel. Time weighted refers to the fact that noise that occurs during certain sensitive time periods is penalized for occurring at these times., The evening time period (7 p.m. to 10 p.m.) penalizes noises by 5 _dBA, while nighttime (10 p.m. to 7 a.m.) noises are penalized by 10 dBA..- Typical CNEL noise levels for different types of communities are presented in Figure 3. FHWA criteria is in terms of the one- hour energy equivalent noise level (Leq) as measured in dBA. The noise impact assessment considers the impact to existing land use and planned development based on the criteria and regulations established by Orange County, the",,State of California, FHWA and local municipalities. 1 A G NOISE SOURCE A Welghted Sound Level NOISE SOURCE d8CA) THRESHOLD OF PAIN RIVETING MACHINE 30 TO 40 FEET AUTOMOBILE HORN 59 FEET AWAY AVERAGE CONVERSATION, 3 FEET NOISY RESIDENCE, INTERIOR OUTDOOR IN RURAL AREA ►ISE LEVELS 1 i 1 1 1 1 1 1 1 11 CNEL Outdoor Location —90— Apartment Next to Freeway 3/4 Mile From Touchdown at Major Airport —80—� Downtown With Some Construction Activity Urban High Density Apartment —70— Urban Row Housing on Major Avenue —60—� Old Urban Residential Area —50— Wooded Residential Agricultural Crop Land ZE —40—� Rural Residential 4 Wilderness Ambient --30— Figure 3 Typical Oudoor CNEL Noise Levels Source: U.S. Environmental Protection Agency, 'Protective Noise Levels, Condensed Version of the EPA Levels Document.' 1978 3.0 EXISTING NOISE LEVELS Noise sensitive land uses and activities were identified through land use maps and site inspections. Existing and planned recreation and park areas, residential, and institutional land uses are considered noise sensitive receptors. There are 52 sites identified as noise sensitive receptors within the Corridor and are therefore subject to both Orange County and FHWA criteria. The selection of these noise prediction sites was based on the land use activity and proximity to the roadway (Figure 4). As part of a previous noise assessment study of the San Joaquin Hills Transportation Corridor conducted by J. J. Van Houten & Associates, Inc., June 1988, noise measurements were conducted at 36 noise sensitive locations in the vicinity of the project corridor. Short term measurements, 10 to 30 minutes long, were taken at 22 locations to represent the 1- hour traffic noise level. At the remaining 14 locations 24- hour noise measurements were made. Of these 36 noise measurement locations 14 short term measurements and 6 long term measurements are reported in the noise impact assessment (Table 1). These measured existing levels have been supplemented with more recent noise measurements conducted by CDMG in February, April, and July 1990 at 38 sites. Existing noise levels were sampled for 20 minute sampling periods at each location. The existing noise measurements and the FHWA land use activity category for the 52 noise sensitive receptor sites are listed in Table 1. The definition of the FHWA land use categories is listed in Table 8 and discussed in Section 6.1 FHWA Criteria. Ten of the 52 sites currently equal or exceed the noise abatement criteria for land use category B, an Leq = 67 dBA. All six sites where CNEL measurements were taken exceed the County of Orange and local cities criteria of 65 dBA CNEL exterior standard for residential land use. 3.1 Aircraft Noise The San Joaquin Corridor study area is exposed to aircraft noise from operations at MCAS El Toro and John Wayne Airport. The aircraft noise contours for both facilities are shown on Figure 5 relative to the location of the Corridor. There are no existing noise sensitive receptors along the Corridor that are exposed to noise levels greater than 60 dB CNEL from MCAS El Toro aircraft operations (Figure 6). The John Wayne Airport 60 dBA and 65 dBA CNEL contour does impact the following locations within the San Joaquin Corridor: businesses along the northbound side of Bristol Street, (receptor R46); and houses and businesses along the southbound side of Bristol Street (receptors R45 and R47). z 0 CA m w m 0 5 0 m r n 0 z CO) m 4�b w 170 I _411, Mgm _�G 6/ Al ,0- 9. -SAqvr CAW ov 0 Ali •'WUtm IT oq 0_� Ak " A _-v , 12, VALLEY 0 10 IS 69 i2 HARVARD ;J00 M ef I O Pim O :r 0 w w w n C o CD � C/) C37 m rt O Lz7 O rh FJ ' . 'V• O f0� K O " rt rt H O O W rt O LL N O a AMa.4 0 0 m O C-4 rt L-1 —M 0 0 0 —.. 0 rt trQ (D 0 CD Z, ;j N C" rho 0 to- rt 0 ;3 rD rl rt En rt 0 r. Pd H (D (A t"h rt o Alcl Ci 1 r_j I I TABLE 1 MEASURED EXISTING NOISE LEVELS FHWA MEASURED NOISE LAND USE LEVELS-dBA SITE LOCATION CATEGORY Laq CNEL R1 SAN JUAN SCHOOL E 61* R2 31601 AVENIDA LOS CERRITOS B 68 R3 SAN JUAN SCHOOL BASEBALL FIELD B 72* R4 RESIDENCES ALONG LA CALEBRA B 70 74* R5 RESIDENCES ALONG EL HORNO B 63* R6 RESIDENCES ALONG EL HORNO B 67* R7 31082 VIA SAN VICERITE B 69 R8 SERRA PARK B 66 R9 26731 PASEO LORETO B 64* 68* R10 30264 CALLE CHUEGA B 66 Rll 26551 ROYALE DRIVE B 64 R12 VILLAGE SAN JUAN - E. OCEANA COURT B 65* 67* R13 VILLAGE SAN JUAN - COUNTRY COURT B 69 R14 SPOTTED BULL LANE B 68* 69* R15 29582 SPOTTED BULL LANE B 73* 76* R16 MONTESSORI SCHOOL E 71* R17 RANCHO CAPISTRAN0,COMMUNITY CHURCH E 58 R18 CAPISTRANO VALLEY H.S. BUILIDNG E 60 R19 CAPISTRANO VALLEY H.S. TENNIS COURTS B 64 R20 28601 AVENIDO DEL CABALLO OPT#1 B 68 R20A 28603 AVENIDO-DEL CABALLO OPT#2 B 67 R21 COUNTY PROPERTY AT PASEO DE COLINAS D 69* R22 28273 RESIDENCE AT BRIDGEPORT PLAZA B 57 R23 28081 MONTECITO-BRIDGEPORT PLAZA B 52 R24 LAGUNA NIGUEL TOWN HOMES -B 65* 67* R25 NIGUEL DEVELOPMENT D 49 R26 27751 HIDDEN TRAIL-NELLIE GAIL B 46 R27 DEL-PRODO TOWNHOUSES B 47 R28 27151 WESTRIDGE STREET B 49 R29 LAGUNA GARDEN APARTMENTS B 42 R30 LAGUNA HILLS HOSPITAL E 51 R31 QUAIL CREEK APARTMENTS B 51 R32 ALISO CREEK APARTMENTS B 52 R33 MORNINGSIDE CONDOMINIUMS B 50 .R34 ALISO VIEJO DEVELOPMENT D 54 R35 ALISO VIEJO DEVELOPMENT D 52 R36 ALISO VIEJO DEVELOPMENT D 51 R37 ALISO VIEJO DEVELOPMENT D 55 R38 ALISO VIEJO DEVELOPMENT D 51 R39 LAGUNA AUDOBON HOUSES B 54 R40 CLUB LAGUNA APARTMENTS B 55 R41 CLUB LAGUNA APARTMENTS B 64 R42 CRYSTAL COVE STATE -PARK B 42 R42a 5312 SIERRA ROJA, TURTLE ROCK B 54 R42b LIBERTY BAPTIST CHURCH, E 50 5108 BONITA CANYON_ DR. R42c 2774 HILLVIEW DR., HARBOR VIEW KNOLL B 48 R42d 2 LOCKE COURT, UCI HOUSING B 50 R43 2738 MILANO DRIVE, NEWPORT NORTH APTS B 54 R43a BONITA CREEK PARK B- 52 R44 3196 CORTE HERMOSA B 53 R45 3501 JAMBOREE ROAD C 71 R46 BRISTOL STREET BUSINESSES C 68* R47 2354 BRISTOL STREET B 74* * JUNE 1988 NOISE MEASUREMENTS 4 1 4.0 TRAFFIC NOISE PREDICTION METHODOLOGY The design year 2010 traffic noise levels for Conventional Operations and Demand Management Operations traffic alternatives were determined using the FHWA STAMINA 2.0 Highway Traffic Noise Modeling Program released by the FHWA , in 1982 (FHWA-DP-58-1). The Stamina 2.0 computer program calculates a predicted noise level through a series of adjustments to a reference sound level. The source levels are calculated using speed -dependent reference noise emissions levels. The State of California has developed independent regression equations based on the noise emission levels of vehicles registered in that state. The Stamina 2.0 Model was adjusted to reflect the difference in the California vehicle emissions. The FHWA Model uses traffic volume, vehicle mix, vehicle speed, and roadway geometry to compute the "equivalent noise level." A computer code has been written which computes equivalent noise levels for each of the time periods used in the calculation of CNEL. Weighting these noise levels and summing them determines the CNEL. The traffic was modeled to determine the time of day when the maximum traffic noise would occur. The 6:00 p.m. to 7:00 pm traffic volume resulted in higher traffic noise levels than the 4:00 p.m. to 5:00 p.m. peak hour volume due to the higher volume of trucks. The peak hour of traffic noise reported in this assessment is 6:00 p.m. to 7:00 p.m. The predicted traffic generated noise levels were then compared to the Orange County and FHWA criteria to determine if a noise impact will occur. Assumptions made in determining the parameters for this analysis consist of: medium -site conditions, a 30 mph speed on all ramps, the percentages of autos, medium trucks and heavy trucks on the ramps were taken to be the same as on the preceding link of the mainline, and existing barriers at residential land uses were modeled. The traffic noise impact assessment was prepared in accordance with both the Orange County Noise Element and the FHWA Federal Highway Policy Manual 7-7-3, "Procedures for Abatement of Highway Traffic Noise and Construction Noise." ' The predicted traffic noise levels for the Orange County assessment are in terms of 24-hour CNEL levels. The FHWA assessment considers the peak hour (6:00 p.m to 7:00 p.m.) Leq noise level. The predicted traffic generated noise levels are compared to the Orange County and FHWA criteria to determine if a noise impact will occur. Detailed input parameters used in the noise modeling and the specific traffic volumes and speeds are presented in Appendix C of this report. The results of the modeling analysis are discussed in the Predicted Design Year Noise Levels section of this report. 5 L FI 5.0 ORANGE COUNTY NOISE IMPACT ASSESSMENT 5.1 Orange County Criteria The Noise Element of the Orange County General Plan establishes noise limits for new residential developments. The exterior noise standard is 65 CNEL and the interior standard is 45 CNEL (Table 2). Compliance with this standard is required of the developer prior to obtaining building permits. 5.2 State of California Criteria The California Department of Health has established guidelines for noise compatible land uses. The -guidelines rate the acceptability of different land use categories exposed to different levels of noise. The 24 hour indices, Ldn and CNEL, are used to measure the community noise ' exposure (Table 3). The 45 CNEL indoor standard is used by most municipalities in the State of California, and also is contained in the California Noise Insulation Standards (California Administrative Code, Title 24, Part .6, Division T25, Chapter 1, Subchapter 1, Article 4, Sections T25-28). The code requires that "interior community noise levels (CNEL) with windows closed, attributable to exterior sources shall not exceed an annual CNEL of 45 dBA in any habitable room." The code requires that this standard be applied to all new hotels, motels, apartment houses and dwellings other than detached single-family dwellings. The Noise Insulation. Standards are applied only to new developments. 5.3 Impact Assessment The design year 2010 traffic volumes and speeds were used to predict future traffic noise levels at existing and planned noise sensitive receptors. Existing and planned residential and recreational land uses along the Corridor were selected and 24-hour CNEL traffic noise was calculated for each of these receptor sites (Figure 4). The CNEL contours of 60 dBA, 65 dBA and 70 dBA were modeled and are reported for both Conventional Operations and Demand Management Alternatives in Table 4 for each of the traffic links by the distance from the centerline of the roadway to the contour. The 65 dBA and 70 dBA CNEL Contours are shown in Figure 7 for the Conventional Operations Alternative, the alternative with the highest traffic noise levels - The CNEL Contours have been prepared for the County of Orange as a guide for future development along the San Joaquin Hills Transportation Corridor and will be made available to local agencies. The contours identify the distance from the centerline where residential land use is acceptable. O�Y T F- OD W W W Z. O N W V J Cl cai LL N O W a z o�c � �w 0 0 �H Za N U) 0 J zz° VZ w w W 0 U U Co Zz : o J > z Z O Ea � I CZ.)V am- • • • 0 H z d oa U z W Q V� - D � U) h W V_ W Q (J) Z M W. oa Q •J ci Z W O ZW ..I > Z W C) C.) � � � �r +w� r � rM wr Mr r■r� � r +w� � w� � » SSY a /� ►/� M � Q Y .� f1 .Yi • vG b .t +G a Y ■ �~w • M .Gi L M i O� O � � q � � .,A .•i pppL O � „ • •.A � p4 � � N S M C V Oi'Q • .4 Tl c on n o Y ftl7 H L .� a-9 R Nu i yy b V .O •-1 � G N Y C1 � 4 � ..1 L add Y O fi d, y w •w �•Y p ` �J • w + 4 6 W N ■ y yu tv .. Y Lp4 2 1� a K Y Y Y A► Q A r1 • & g� B X R O. O .� • b• p •f! Y �p + L • M t 4 tl V 6 r + Y Y •0 ..OI 7 + O H 9 �O S • CJ .i • R IC ' Al as � � C■� 4 4 ■ C N L Y K Y 4 0 N ' N v +� • L i+ p ty0 M •/ Y ytl� •! �0 D O .pf C O .vi g s • inq As At ba ..y{ .�{ C ■ L XY L M • C C♦ (yS�AC 1 O Y t t f f • f t f , • u p U p p � q �vj • ' S r N N N e'� N 4 4 S• • n /V � n �'1 N p O O ■ Al AA ic x o a'r1 C B g 3 y M' • ���� 9�c �� � �� � as o � r s M .Oj u ~ � M Y 7 M =o .� •.~fie Y � T N 4 'C� .•1 o u • p C y h g • w 41 u Hi■q �•n 1� ■ y w i RBi yi a Y Q � � G � V K O /i � � � � N M ti - • i. 7 �to N- co J C d Co Ol� 0 :5 `oC �E o U U H .O v Z 0 O co a COMMUNITY NOISE EXPOSURE Lm OR CNEL, dS LAND USE CATEGORY 55 60 65 .70 75 80 RESIDENTIAL - LOW DENSITY SINGLE FAMILY, DUPLEX, MOBILE HOMES RESIDENTIAL - MULTIFAMILY TRANSIENT LODGING - MOTELS, HOTELS SCHOOLS, LIBRARIES, CHURCHES, HOSPITALS, NURSING HOMES AUDITORIUMS, CONCERT HALLS, AMPHITHEATRES SPORTS ARENA, OUTDOOR SPECTATOR SPORTS PLAYGROUNDS, :::: K. NEIGHBORHOOD PARKS GOLF COURSES, RIDING '#�� >::':::::>.:;t::; �����-- ••••-•--•- ;:::> ::•«;;:;::::>:::;;::::: ••• ••• • • •••• STABLES, WATER RECREATION, 1 CEMETERIES I OFFICE BUILDINGS, BUSINESS COMMERCIAL AND PROFESSIONAL ..i•::.::: •:::.::•:.:: INDUSTRIAL, MANUFACTURING UTILITIES, AGRICULTURE <<<ti:r:::::: LEGEND NORMALLY ACCEPTABLE Specified land use is satisfactory, based upon the assumption that any buildings involved are of normal conventional construction, without any special noise insulation requirements. CONDITIONALLY ACCEPTABLE -New construction or development should be under- taken only after a detailed analysis of the noise - reduction requirements is made and needed noise insulation features included in the design. Conven- tional construction, but with closed windows and fresh air supply systems or air conditioning will normally suffice. NORMALLY UNACCEPTABLE New construction or development should generally be discouraged. If new construction or development does proceed, a detailed Y the noise analysis of h n ' se reduction requirements must be made and needed noise insulation features included in the design. CLEARLY UNACCEPTABLE New construction or development should generally not be undertaken. CONSIDERATIONS IN DETERMINATION OF NOISE -COMPATIBLE LAND USE A. NORMALIZED NOISE EXPOSURE INFORMATION DESIRED Where sufficient data exists. evaluate land use suitability with respect to a .normalized" value of CNEL or Lam,. Normalized values are obtained by adding or subtracting the constants described in Table t to the measured or calculated value of CNEL or L.. B. NOISE SOURCE CHARACTERISTICS The land use -noise compatibility recommendations should be viewed in relation to the specific source of the noise. For example, aircraft and railroad noise is normally made up of higher single noise events than auto traffic but occurs less frequently. Therefore, different sources yielding the same composite noise exposure do not necessarily create the same noise environment. The State Aeronautics Act uses 65 dB CNEL as the criterion which airports must eventually meet to protect existing residential communities from unacceptable exposure to aircraft noise. In order to facilitate the purposes of the Act, one of which is to encourage land uses compatible with the 65 dB CNEL criterion wherever possible, and in order to facilitate the ability of airports to comply with the Act, Table 3 residential uses located in Community Noise Exposure Areas greater than 65 dB should be discouraged and considered located within normally unacceptable areas. C. SUITABLE INTERIOR ENVIRONMENTS One objective of locating residential units relative to a known noise source is to maintain a suitable interior noise environment at no greater than 45 dB CNEL of L.. This requirement, coupled with the measured or calculated noise reduction performance of the type of structure under consideration. should govern the mini- mum acceptaole distance to a noise source. D. • ACCEPTABLE OUTDOOR ENVIRONMENTS Another consideration, which in some communities is an overriding factor, is the desire foran acceptable outdoor noise environment. When this is the case, more restrictive standards for land use compatibility, typically below the maximum con- sidered "normally acceptable" for that land use category, may be appropriate. Source: California Department of Health. Guidelines for the Preparation and Content of Noise Elements of The General Plan. February, 1976 California Noise and Land Use Compatibility Guidelines I 1 C 1 I �_ 1 i F TABLE 4 DISTANCE TO CNEL COUNTOURS - FT* Location CNEL=60 dBA CON DM CNEL=65 dBA CON- DM CNEL=70 dBA CON DM NORTH OF JAMBOREE NB 815- 810 535 530 365 365 SB 910 865 530 510 355 345 UNIVERSITY TO MCARTHUR NB 905 855 670 650 515 505 SB 775 690 440 410 285 265 MCARTHUR TO BISON NB 575 570 430 420 360 360 SB 710 660 450 430 330 310 BISON TO BONITA CANYON NB 780 685 435 420 240 235 SB 835 750 430 390 240 220 BONITA CANYON TO PELICAN HILL NB SB 765 720 710 630 375 350 350 310 195 185 175 165 PELICAN HILL TO SAN NB 845 715 430 37.0 240 215 JOAQUIN HILLS SB 1.035 770 520 400 280 225 SAN JOAQUIN HILLS TO NB 845 700 410 345 215 180 SAND CANYON- SB 955 680 460 340 230 170 SAND CANYON TO LAGUNA NB 840 735 445 395 260 235 CANYON SB, 1000 715 520 385 295 230 LAGUNA CANYON TO EL TORO NB 745 790 425 450 280 290 SB 720 760 425 440 280 '285 EL TORO TO PACIFIC PARK NB 760 570 460 3.35 345 180 SB 760 620 510 34-0 390 210 PACIFIC PARK TO ALISO NB 690 660 400 385 265 260 CREEK SB 700 625 390 355 250 235 ALISO CREEK TO LA PAZ NB 665 590 375 340 240 225 SB '705 6,10 395 350 250 230 LA PAZ TO MOULTON PKWY .NB 690 700 440 450 330 330 SB 715 715 385 385 23'0 230 MOULTON PKWY TO NB 750 650 400 355 240 220 GREENFIELD DR. SB 710 620 380 340 230 210 GREENFIELD DR. TO NB 665 645 335 32-5 185 180 PASEO DE COLENAS SB 705 660 355 330 190 180 PASEO DE COLENA TO NB 810 810 420 42'0 235 235 ' JUNIPERO SERRA SB 680 680 395 395 265 265 JUNIPERO SERRA TO-ORTEGA NB 860 860 42-0 420 220 22-0 SB 850 850 -410 410 205 2'05 * DISTANCE TO NOISE CONTOURS AS MEASRED FROM CENTERLINE OF CORRIDOR CON - CONVENTIOAL ALTERNATIVE DM - DEMAND MANAGEMENT ALTERNATIVE 9 These contours are also used to identify the existing and planned residential land use areas that will be impacted by the SJHTC. Exterior noise levels at residential locations should not exceed a CNEL of 65 dBA. The Conventional Alternative would result in the highest ' traffic noise levels. Under this alternative, noise levels exceeding the CNEL residential land use standard of 65 dBA will occur at 27 of the 52 noise modeling locations. The predicted 2010 CNEL levels for the Conventional Alternative, number and types of receptors impacted at each modeling locations is listed in Table 5 and will be considered for mitigation where feasible. 5.4 Noise Abatement Measures The SJHTC Corridor passes through several areas that are yet i undeveloped but planned for residential and other types of development. Mitigation measures provided by developers will be needed to reduce noise levels in outdoor and indoor residential areas along the Corridor. Planned future residential developments will have to incorporate freeway mitigation measures into their site design and building plans at the time they apply for grading and building permits. The mitigation will be incumbent upon the developer of those areas. Standard Conditions of Approval N1, N2, N11, and N12 should be applied to developments within the 60 CNEL contour for the corridor. The conditions of approval are listed on Figure 8. Condition N2 is applied to non-residential developments while the other conditions are applied to residential development. Conditions N1 and N2 require that the development projects meet certain noise standards. ' Conditions N11 and N12 provide notices that the property is near a transportation corridor. In addition to the above requirements, the County also requires that new residential developments be designed and constructed to meet the noise standards of the California Department of Transportation (Caltrans). The Caltrans criteria require that outdoor living areas be mitigated to a peak hour Leq noise level of less than 67 dBA using noise barriers (soundwalls). The noise barrier, at a minimum should interrupt the line of sight between the top of a truck ' stack (11.5 feet above the roadway grade) and an observer in a private outdoor living area and provide a noise reduction of 5 dBA or more. A noise barrier analysis was conducted at those locations where noise impacts are predicted to occur. The reduction in traffic noise was determined for different height barriers. ' Mitigation in the form of a noise barrier is not considered feasible where a height of more than 16 feet from the pavement surface is required to interrupt the line of sight from a heavy truck stack (11.5 feet above the roadway) to a residential area. If the barrier is located within 15 feet of the traveled way the height is restricted to 14 feet. 1 10 � 1 1 1 1 1 1 1 1 1 1 i 1 1 1 1 1 i 1 1 The County of Orange applies the following noise -related condi- tions of approval to all residential and non-residential projects In noise impacted areas (CHEL exceed3'60 dB): Ni. All residential lots and dwellings shall 'be sound attenuated against present and projected noise, which shall be the sum of all noise impacting the project, so as not to exceed an exterior standard of 65 dB CHEL in outdoor living areas and an interior standard of 45 dB in all habitable rooms. Evi- dence prepared under the supervision of a County -certified acoustical consultant that these standards will be satisfied in a manner consistent with applicable zoning regulations shall be submitted as follows: A. Prior to the recordation of a final tract/parcel map or prior to the issuance of Grading Permits, at the sole discretion of the County,•. Acoustical Analysis Report shall be submitted -to the Manager, Development Services Division, for approval. The report shall describe in detail the exterior noise environment and preliminary mitigation measures. Acoustical design features to achieve interior noise standards may be included in the report in which case it may also satisfy "B" below. B. Prior to the issuance of any building permits, an acous- tical analysis report describing the acoustical design features of the structures required to zatisfy.the ex- terior and interior noise standards shall be submitted to the Manager, Development Services Division for ap- proval•along with satisfactory evidence .which indicates that the sound attenuation measures specified in the ap- proved acoustical report(s) !lave been incorporated into the design of the project. C. Prior to the issuance of any building permits, all freestanding acoustical 'barriers must be shown on the projectes plot plan illustrating height, location and construction in a manner meeting the approval of the Manager, Development Services Division. D. Prior to the issuance of any Certificates of Use and Oc- cupancy, field testing in accordance with Title 25 regulations may be required by the Manager, Building In- spection division, to verify compliance with STC and IIC design standards. H2. All non-residential structures shall be sound attenuated against the combined impact of all present and projected noise from exterior -noise sources to meet the interior noise criteria as specified in [Table II-11., Prior to the issuance of any building permits, evidence pre- pared under the supervision of a County -certified acoustical consultant that these standards will be satisfied in a man- ner consistent with applicable zoning regulations shall be submitted to the Manager, Development Services Division in the form of an Acoustical Analysis Report describing in detail the exterior noise environment and the acoustical design features required to achieve the interior noise standard and which indicate that the sound attenuation measures specified have been incorporated into the design of the project. H11. Prior to recordation of the first final tract/parcel map, the owner of record of the property within the boundaries of this tentative tract/parcel map shall prepare.and-record' a notice that this property may be subject to impacts from the proposed Transportation Corridor in a manner meeting the ap- proval of the Manager, Development Services Division. H12..Prior to the issuance of Certificates of Use and Occupancy, the developer shall produce evidence to the Manager, Development Services Division, that the Department of Real Estate has been notified that the :pr.oject area is adjacent to a regional transportation corridor which is shown on the Orange County Hester Plan of Arterial Highways and which will pass along the side of ( feet erly from) the subdivision ( project.) The corridor is ei- pected to be a high capacity, high-speed, limited -access facilitX for motor vehicles;, and will have provisions for bus lanes and other mass transit type facilities. ORANGE COUNTY STANDARD CONDITIONS OF APPROVAL Figure 8 TABLE 5 PREDICTED 2010 TRAFFIC NOISE LEVELS-CNEL(dBA) ORANGE COUNTY NOISE ASSESSMENT NUMBER & NOISE LEVEL-CNEL(dBA) TYPES OF RECEPTORS DEMAND SENSITIVE RECEPTOR IMPACTED EXIST. CONY. MGMT R1 SAN JUAN SCHOOL- NONE 64 64 STA 521 R2 31601 AVENIDA LOS 5 HOUSES 67 67 CERRITOS-STA 525 R3 SAN JUAN SCHOOL BALLFIELD 75 75 BASEBALL FIELD-STA 528 R4 RESIDENCES ALONG LA 74 74 74 CALEBRA-STA 535 I R5 RESIDENCES ALONG EL -+A TOTAL OF 69 69 HORNO-STA 538 19 HOUSES R6 RESIDENCES ALONG EL 73 73 HORNO-STA 541 R7 31082 VIA SAN VICERITE- 22 HOUSES 73 73 STA 551 R8 SERRA PARK-STA 558+50 PARK 72 72 R9 6731 PASEO LORETO- 35 HOUSES 68 71 71 STA 568 R10 30264 CALLE CHUEGA 16 UNITS 70 70 STA 581+50 Rll 26551 ROYALE DRIVE- NONE 64 64 STA 608 R12 VILLAGE SAN JUAN APTS- 3 UNITS 67 67 66 26251 OCEANA CT-STA 628 R13 VILLAGE SAN JUAN APTS 8 UNITS 70 70 26192 COUNTRY CT-STA 634 R14 RESIDENCE ON SPOTTED 69 70 70 BULL LANE-STA 649+50 -+A TOTAL OF R15 RESIDENCE ON SPOTTED HOUSES 76 73 72 BULL LANE-STA 651+50 15 R16 MONTESSORI SCHOOL- SCHOOL 73 73 STA 654 R17 RANCHO CAPISTRANO NONE 64 64 COMMUNITY CHURCH-STA 668 R18 CAPISTRANO VALLEY H.S. NONE 65 64 BULDING-STA 681 R19 CAPISTRANO VALLEY H.S. NONE 66 65 TENNIS COURTS-STA 684 R20 28601 AVENIDO DEL 12 HOUSES 72 71 CABALLO (OPT#1)-STA 9470 R20A 28603 AVENIDO DEL 1 HOUSE 66 66 CABALLO (OPT#2)-STA 695 R21 COUNTY PROPERTY-STA 9470 NONE 71 70 R22 RESIDENCES AT BRIDGEPORT 5 HOUSES 66 64 PLAZA-STA 9478 R23 RESIDENCES AT BRIDGEPORT 24 UNITS 63 62 PLAZA-STA 9487 R24 RESIDENCE AT R.H.- 8 HOUSES 67 67 66 STA 9503+50 R25 NIGUEL DEVELOPMENT- UNDEVELOPED 69 68 STA 9515 11 L 1 L 1 u C n 1 1 1 11 1 TABLE 5 (Cont'd) NUMBER & TYPES OF RECEPTORS SENSITIVE RECEPTOR IMPACTED R26 27751 HIDDEN TRAIL 10 HOUSES NELLIE GAIL-STA 9538 R27 DEL PRODO TOWNHOUSES- 8 UNITS STA 9539 R28 27151 WESTRIDGE ST 21 HOUSES NELLIE GAIL-STA 9580 R29 LAGUNA GARDEN APARTMENTS- 28 UNITS STA 9596 R30 LAGUNA HILLS HOSPITAL= NONE STA 9596+50 R31 QUAIL CREEK APARTMENTS- 4 UNITS STA 9608 R32 ALISO CREEK APARTMENTS- NONE STA 9614 R33 MORNINGSIDE CONDOMINIUMS- 8 HOUSES STA 9626+50 R34 ALISO VIEJO DEVELOPMENT- UNDEVELOPED STA 9648 R35 ALISO VIEJO DEVELOPMENT- UNDEVELOPED STA 9647 R36 ALISO VIEJO DEVELOPMENT- UNDEVELOPED STA 9677 R37 ALISO VIEJO DEVELOPMENT- UNDEVELOPED STA 9731 R38 ALISO VIEJO DEVELOPMENT- UNDEVELOPED STA 9736 A39 LAGUNA.AUDOBON HOUSES- NONE STA 9761 R40 CLUB LAGUNA APARTMENTS- STA 9767 -+A TOTAL OF R41 CLUB LAGUNA APARTMENTS- 110 UNITS STA 9768 NOISE LEVEL-CNEL(dBA) DEMAND EXIST. CONY. MGMT 60 58 70 69 67 65 R42 CRYSTAL COVE STATE PARK PARK-STA 918 R42a 5312 SIERRA ROJA, TURTLE NONE ROCK-STA 1065 R42b LIBERTY BAPTIST CHURCH, NONE BONITA CANYON DR-STA 1070 R42c 2774 HI,LLVIEW DR, HARBOR NONE VIEW KNOLL-STA 1090 R42d 2 LOCKE COURT, UCI NONE HOUSING-STA 1100 R43 2738 MILANO DRIVE,NEWPORT NONE NORTH APTS-STA 1167 R43a BONITA CREEK PARK- PARK STA 1172 R44 3196 CORTE HERMOSA- NONE STA 1178 R45 3501 JAMBOREE-BRISTOL ST 6 STOREY BUSINESSES - STA 1210 'OFFICE BLDG R46 PLAZA NEWPORT-BRISTOL ST RETAIL BUSINESSES - STA 1210 CENTER R47 2354 BRISTOL ST - STA 1227 3 HOUSES 71 67 65 57 72 71 70 72 66 Cf:3 60 67 65 64 61 58 62 56 63 65 61 72 72 76 69 66 64 56 70 70 69 70 63 67 58 65 63 62 61 58 62 56 63 65 61 72 72 76 1 12 'i7 H r0 "O 0 H H H I W A W a z aaa zz z M OH H O O O H H H I w H aaa wW W W H H H H W HMIz-1 W W W I A M 119P A 00 —Ln C1 r ba � LnCn1D%D Ln1Dr-�LnLn �sjW%Drr G�1D1D W Lnco10w a wz v vv (�� mO (E) Ln v I W l a %D * N H O N * o w 010 m a N H of m m 01 D1 o) LD o r z(n -;tt 'n��n�n�o�o���ninc�WWE-rarmww— _ W I I HOLn —m Od�►n�-tnOorntor-fao M 'WW z � rl1DMLD WgztW mLn zLDLDrr z zWw I I Z%DLnW%DLn A z off z %D 1D z W H • 00LnLn ^NLn00000°H--oC44 HHV Ln °H-0%D-00 [-L W~ O Ln 1D 1D v LO LO r r LD to 4 c14v W r r H LD 1D * 04 � LD 1D W Ln A ' (n H *. �c # H H H Ln LD H H W H 1D # is is .-f H .... 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The Corridor, a new roadway which connects I-5 to SR-73, is intersected by local arterials along the alignment. At most of the locations along the Corridor the only source of noise is the existing traffic movements alone these arterial roads. To assess the change in traffic noise along these local arterials the 2010 year no -build average daily traffic volumes (ADT) are compared to the 2010 year build ADT volumes. This analysis is based on the projected change in travel patterns in the region which will result in different noise levels in the year 2010 with and without the Corridor. The roadway segments selected for assessment along the Corridor are shown in Figure 9. The change in local travel patterns generated by the Corridor would result in a decrease in traffic noise levels along most of these arterial roadways in the range of 0.3 dB to 6.3 dB (Table 7). This is considered a barely noticeable to clearly noticeable change in noise level. At those roadway segments where traffic noise is expected to increase, the maximum change would be 3.8 dB, a barely noticeable change in level. 1 1 F u 1 C L II 15 1 I; k \\ I/ I Sri ./ �~ZS:.. `4 .`,,• _ ZVdilrat All 71 1 k ,I'r �y ��%'..::::. ,� • a/< -_ `> _....:.%) it 111 ..a� .l :::�r•:;::. �Clr - ll%�`' - _-�.� �.».'-.�:�.'��,L�:.-.,^. �l -._ v----"�-.,� � _ -� =' �._- _--�• !" � ,' �\/."__ .. Jam. gy --- All, 7• i N VT il '�• l?` � �1 ✓� 11 � 11 J // � ,LACUNA f• v_ � �� � U Ic 1oN'ONO /� �/ `'I t r • � �y�.> 1/i / SIG ' � f �, 1. � .'�,,. 'r l � - �- �\ � • • _ � ----- •. l /! Zrib so 2ri l � l v�'\„`-� o0 l �� - '? �: ll_ 8y 3r % - l b '• ` 401 ��_•::. ^J � ` \ 1 -- 11 / S`� ,y t 00 N q Via\ ,ads A �'t3T1H1H'bjb.y ( X-4 t L /� �' �.�� �No�Y^`=�.✓-� i � ��ijj'al;'N�� i Wbr ..:� �.___ 1�/ \\ �� } J3 11 oor _-r-• .s�(^J--cya'�Srndw.}�,� ' f •• ��• ,_ �s�.: it _� �I _ � ,� _-_-__._ ,o\_,— •_..i"` bD / '%�` 7 �` t •• ;I � it /� ri, w � � � •J �,• Nl�bl �` fit\ r?IP ' TABLE 7 ' CHANGE IN NOISE LEVELS -ON ARTERIAL ROADWAYS WITH CORRIDOR ROADWAY SEGMENT CHANGE IN CNEL LEVEL-dBA Jamboree Road East of Corridor, =1.6 ' West of Corridor -0.7 Macarthur'Boulevard East of Corridor -0.7 West of Corridor -0.8 University Drive -1..3 Bonita Canyon Drive -2.-6 Ford Road -0.3- Culver Road NONE -Pelican Hill Road NONE Sand Canyon Road East of Corridor +0.4 West of Corridor +1.0 Laguna Canyon Road East of Corridor -0.9 ' West of Corridor +0.7 E1 Toro Road East of Corridor -1.0 West of Corridor +0.6 Glenwood Drive +3.8 Pacific Park Drive +2.6 Alicia Creek Road Alicia Creek Parkway -5.1 -1.2- La Paz Road East of Corridor +0.8 West of Corridor -6..3 Pacific Drive East of Corridor +1.6 West of Corridor +0.4 Moulton Parkway East of Corridor -1.3 West of Corridor -1.3 Crown Valley Parkway East of Corridor +0.6 West of Corridor +1.5 I-5 La Paz Road to Oso Parkway -0.6 I-5 Oso Parkway to Crown Valley Parkway -0.7 I-5 Crown Valley Parkway to Avery Parkway -0.8 I-5 Avery Parkway to Junipero Cerra Road +1.0 ' I-5 Junipero Cerra Road to Ortega Highway +0.9 Note: A positive change (+) is an increase in noise level without the corridor and a negative change (-) is a decrease in level with the corridor. 16 6.0 FHWA NOISE IMPACT ASSESSMENT 6.1 FHWA Criteria The Federal Highway Policy Manual (FHPM), Volume 7, Chapter 7, Section 3, "Procedures for Abatement of Highway Traffic Noise and Construction Noise": (FHPM 7-7-3) contains the noise regulations promulgated by the Federal Highway Administration (FHWA), 1982). The regulations require that a noise analysis be conducted for all new highway construction projects. Noise sensitive land uses and activities in the vicinity of highway projects must be identified, and anticipated noise levels must be computed for the noise - sensitive areas on the basis of expected design hour conditions. The regulations contain noise abatement criteria (Table 7) considered by FHWA to be the upper limits of acceptable noise levels for exterior land uses and outdoor activities and for certain interior uses. Noise level predictions are to be evaluated to determine the need for noise abatement measures for existing developed land. Such measures are to be taken on all projects to meet the noise abatement criteria to the extent that reasonable opportunities exist to control noise. Factors associated with the FHWA standards are: o FHWA authorizes the use of federal funds for noise abatement wherever a traffic noise impact can be identified provided only that the abatement measures reduce the noise impact and the overall benefits exceed the overall adverse social, economic, and environmental effects. o A noise impact can exist when the predicted design year traffic noise levels equal or exceed the noise abatement criteria, or the predicted traffic noise levels substantially exceed the existing noise levels. o The noise abatement criteria in the standards represent a balancing between that which is desirable and that which may be achievable; noise impacts can occur even though the noise abatement criteria are achieved. o The values in Table 8 should be viewed as maximum acceptable values, with the recognition that in many cases the achievement of lower noise levels would result in even greater benefits to the community. o While the noise abatement criteria apply only to lands which are developed, the standard indicates that highway agencies may consider the desirability to applying them to certain undeveloped lands which are likely to be developed. 1 1 f� 1 17 n I 1 1 1 H 1 Wil-y"U:3 FHWA NOISE ABATEMENT CRITERIA Category Leq(h) Description of Activity Category A 57 dBA Tracts of land where serenity and quiet (Exterior) are of extraordinary significance and serve an important public need and where the preservation of those qualities is essential if the area is to continue to serve its intended purpose. B 67 dBA Picnic areas, recreation areas, (Exterior) playgrounds, active sports areas, and parks which are not included in Category A and residences, motels, hotels, public meeting rooms, schools, churches, libraries, and hospitals. C 72 dBA Developed lands, properties or (Exterior) activities not included in Categories A or B above. D --- Undeveloped lands. E 52 dBA Residences, motels, hotels, public (Interior) meeting rooms, schools, churches, libraries, hospitals, and auditoriums. Notes: Leq(h) is the one -hour energy equivalent sound level. The interior noise levels (activity) apply to: (1) Indoor activities for those parcels where -no exterior noise -sensitive land use or activity is identified, and (2) those situations where the exterior activities on a track are either remote from the highway or shielded in some manner so that the exterior activities will not be affected by the noise, but the interior activities will. 18 L Interior noise abatement criteria apply to indoor activities for those parcels where exterior activities on a tract are either remote from the highway or shielded in some manner so that the exterior activities will not be affected by the noise, but the interior activities will. Interior noise level predictions may be computed by subtracting the noise reduction factors for the building in question from the predicted levels. The standard does not guarantee the elimination of annoyance or disturbance from traffic noise even in those situations where the noise abatement criteria are met. Occasional peak noises, such as those which occur from the passage of a few trucks per hour, will not be fully controlled. The reduction of these occasional noise peaks (and concurrent reduction of annoyance) will come when the appropriate agencies provide for reduction of vehicle source noise levels, both through improved vehicle noise emission standards and enforcement of maximum operating noise limits. 6.2 Impact Assessment The design year 2010 traffic volumes and speeds were used to predict future peak one -hour Leg traffic noise levels at existing and planned noise sensitive receptors along the Corridor (Figure 4). The Leq= 67dBA contour was modeled and is reported in Table 9 for each of the traffic links by the distance from the centerline of the roadway to the contour. Figure 10 represents the 67 dBA contour for the Conventional Operations Alternative, the worst case scenario. The Leq= 67dBA contour is used to identify the existing and planned residential land use areas that will be impacted by the alignment. The FHWA defines a noise impact as either design year traffic noise levels equaling or exceeding the residential noise abatement criteria of Leq=67 dBA or if design year noise levels substantially exceed. Caltrans defines substantial as 12 dB or more above the existing noise levels and greater or equal to 65 dBA. The Conventional Alternative would result in the highest traffic noise levels. Under this alternative there are 29 of the 52 noise modeling locations that equal or exceed the FHWA noise abatement criteria for exterior land use categories B and C. Noise barriers at these locations will be considered to mitigate the noise impact. The results of the Conventional Alternative 2010 traffic noise predictions, locations of the receptors relative to the roadway and the number and types of receptors impacted at each modeling location are listed in Table 10. There are six receptor sites where the predominant land use is interior activity, FHWA category E. At these locations the traffic noise levels are predicted as interior noise levels by using FHWA defined noise reduction values for different types of building construction (Table 11) to adjust the predicted exterior traffic noise levels. These noise 1 1 k 1 iJ 11 1 1 19 1 I 1 1 1 1 1 1 1 1 1 TABLE 9 DISTANCE TO Leq = 67 dBA NOISE CONTOUR - FT.* DEMAND LOCATION CONVENTIONAL MANEGEMENT NORTH OF JAMBOREE NB 540 535 SB 550 540 UNIVERSITY TO MCARTHUR NB 675 650 SB 460 420 MCARTHUR TO BISON NB 430 425 SB 450 430 BISON TO BONITA CANYON/FORD NB 425 410 SB 420 390 BONITA CANYON/FORD TO PELICAN HILL NB 370 350 SB 350 310 PELICAN HILL TO SAN JOAQUIN HILLS NB 420 370 SB 510 390 SAN JOAQUIN HILL TO SAND CANYON NB 410 345 SB 460 340 SAND CANYON TO LAGUNA CANYON RD NB 440 395 SB 510 390 LAGUNA CANYON TO EL TORO NB 445 460 SB 425 445 EL TORO TO PACIFIC PARK NB 460 340 SB 510 345 PACIFIC PARK TO ALISO CREEK NB 390 375 SB 400 370 ALISO CREEK TO LA PAZ NB 390 360 SB 410 360 LA PAZ TO MOULTON PKWY NB 445 450 SB 390 390 MOULTON PARKWAY TO GREENFIELD DR. NB 400 360 SB 390 350 GREENFIELD TO PASEO DE COLINAS NB 325 320 SB 345 325 PASEO DE COLINAS TO JUNIPERO NB 420 420 SERRA SB 390 390 JUNIPERO SERRA TO ORTEGA NB 410 410 SB 410 410 * DISTANCE TO NOISE CONTOURS FROM CENTERLINE OF THE CORRIDOR 11 20 Jd low m ON M, no No so p T I F' °° 0 Iw r w W a Z p M N {w a C3 W Q Z W o oa z� z V z o z O W o Z > W 00 i Ci H� Z J U z O W �z LLI Z > ao • r. OW • J y \ Q 0 cr W J LU a oZc W oa Z Oz J U0 W- - Z z co J U TABLE 10 ' PREDICTED 2010 TRAFFIC NOISE LEVELS-Leq(dBA) FHWA NOISE ASSESSMENT ' NUMBER & NOISE LEVEL-Leq(dBA) TYPES OF RECEPTORS DEMAND ' SENSITIVE RECEPTOR IMPACTED EXIST. CONY. MGMT R1 SAN JUAN SCHOOL- NONE 61 66 66 STA 521 R2 31601 AVENIDA LOS 5 HOUSES 6-8 69 69 CERRITOS-STA 525 R3 SAN JUAN SCHOOL BALLFIELD 72 77 77 BASEBALL FIELD-STA 528 - R4 RESIDENCES ALONG LA 70 76 76 CALEBRA-STA 535 R5 RESIDENCES ALONG EL -+A TOTAL OF 63 71 71 HORNO-STA 538 19 HOUSES R6 RESIDENCES ALONG EL 67 75 75 HORNO-STA 541 R7 31082 VIA SAN VICERITE- 22 HOUSES 69 75 75 STA 551 ' R8 SERRA PARK-STA 558+50 PARK 66 74 74 R9 6731 PASEO LORETO- 35 HOUSES 64 73 73 STA 568 R10 30264 CALLE CHUEGA 16 UNITS 66 72 72 ' STA 581+50 Rll 26551 ROYALE DRIVE- NONE 64 66 66 STA 608 R12 VILLAGE SAN JUAN APTS- 3 UNITS 65 69 68 26251 OCEANA CT-STA 628 R13 VILLAGE SAN JUAN APTS 8 UNITS 69 72 72 R14 26192 COUNTRY CT-STA 634 RESIDENCE ON SPOTTED 68 72 72 BULL LANE-STA 649+50 -+A TOTAL OF R15 RESIDENCE ON SPOTTED HOUSES 73 75, 74 BULL LANE-STA 651+50 15 1 R16 MONTESSORI SCHOOL- SCHOOL 71 75 75 STA 654 R17 RANCHO CAPISTRANO NONE 58 66 66 COMMUNITY CHURCH-STA 668 ' R18 CAPISTRANO VALLEY H.S. NONE 60 67 66 BULDING-STA 681 R19 CAPISTRANO VALLEY H.S. TENNIS COURTS-STA 684 NONE 64 68 67 R20 28601 AVENIDO DEL 12 HOUSES 68 74 73 CABALLO (OPT#1)-STA 9470 - R20A 28603 AVENIDO DEL 1 HOUSE 67 68 68 CABALLO (OPT#2)-STA 695 R21 COUNTY PROPERTY-STA 9470 NONE 69 73 72 R22 RESIDENCES AT BRIDGEPORT 5 HOUSES 57 68 66 PLAZA-STA 9478 ' R23 RESIDENCES AT BRIDGEPORT 24 UNITS 52 65 64 PLAZA-STA 9487 R24 RESIDENCE AT R.H.- 8 HOUSES 65 69 68 1 STA 9503+50 R25 NIGUEL DEVELOPMENT- UNDEVELOPED 49 71 70 STA 9515 1 21 TABLE 10 (Cont'd NUMBER & NOISE LEVEL-Leq(dBA) TYPES OF RECEPTORS DEMAND SENSITIVE RECEPTOR IMPACTED EXIST. CONY. MGMT R26 27751 HIDDEN TRAIL 10 HOUSES 46 62 60 NELLIE GAIL-STA 9538 R27 DEL PRODO TOWNHOUSES- 8 UNITS 47 72 71 STA 9539 R28 27151 WESTRIDGE ST 21 HOUSES 49 69 67 NELLIE GAIL-STA 9580 R29 LAGUNA GARDEN APARTMENTS- 28 UNITS 42 73 71 STA 9596 R30 LAGUNA HILLS HOSPITAL- NONE 51 69 68 STA 9596+50 R31 QUAIL CREEK APARTMENTS- 4 UNITS 51 67 66 STA 9608 R32 ALISO CREEK APARTMENTS- NONE 52 59 58 STA 9614 R33 MORNINGSIDE CONDOMINIUMS- 8 HOUSES 50 74 72 STA 9626+50 R34 ALISO VIEJO DEVELOPMENT- UNDEVELOPED 54 73 72 STA 9648 R35 ALISO VIEJO DEVELOPMENT- UNDEVELOPED 52 72 71 STA 9647 R36 ALISO VIEJO DEVELOPMENT- UNDEVELOPED 51 74 72 STA 9677 R37 ALISO VIEJO DEVELOPMENT- UNDEVELOPED 55 68 65 STA 9731 R38 ALISO VIEJO DEVELOPMENT- UNDEVELOPED 51 70 69 STA 9736 R39 LAGUNA AUDOBON HOUSES- NONE 54 62 60 STA 9761 R40 CLUB LAGUNA APARTMENTS- 55 69 67 STA 9767 -+A TOTAL OF R41 CLUB LAGUNA APARTMENTS- UNITS 64 67 65 110 STA 9768 R42 CRYSTAL COVE STATE PARK 42 66 64 PARK-STA 918 R42a 5312 SIERRA ROJA, TURTLE NONE 54 63 63 ROCK-STA 1065 R42b LIBERTY BAPTIST CHURCH, NONE 50 60 60 BONITA CANYON DR-STA 1070 R42c 2774 HILLVIEW DR, HARBOR NONE 48 64 64 VIEW KNOLL-STA 1090 R42d 2 LOCKE COURT, UCI NONE 50 58 58 HOUSING-STA 1100 R43 2738 MILANO DRIVE, NEWPORT NONE 54 65 65 NORTH APTS-STA 1167 R43a BONITA CREEK PARK- PARK 52 67 67 STA 1172 R44 3196 CORTE HERMOSA- NONE 53 63 63 STA 1178 R45 3501 JAMBOREE - BRISTOL ST 6 STOREY 71 74 74 BUSINESSES STA 1210 OFFICE BLDG R46 PLAZA NEWPORT -BRISTOL ST RETAIL 68 74 74 BUSINESSES STA 1210 CENTER R47 2354 BRISTOL ST - STA 1227 3 HOUSES 74 78 78 22 1 reduction values consider either windows open -or closed depending if the building is air conditioned. The predicted ' interior traffic noise levels at'these six sites are listed in Table 12. Mitigation measures would be required to these interior land uses if the interior noise levels approach or ' exceed an Leq = 52 dBA. Sites R16,.Montessori School, is the only interior land use that would require mitigation. Table 11 FHWA BUILDING NOISE REDUCTION VALUES BUILDING NOISE ' TYPE WINDOWS REDUCTION ALL WINDOWS OPEN 10 dBA LIGHT FRAME ORDINARY SASH WINDOWS CLOSED 20 dBA LIGHT FRAME STORM SASH WINDOWS CLOSED 25 dBA ' MASONRY SINGLE GLAZED WINDOWS CLOSED 25 dBA MASONRY DOUBLE GLAZED WINDOWS CLOSED 35 dBA SOURCE: FHWA, 1982 6.3 Noise Abatement Measures The FHWA requires that feasible and practical noise abatement be considered to mitigate a noise impact at a sensitive area or land use. Feasible noise abatement measures that may be considered to mitigate the excessive traffic noise levels are the installation of noise barriers within or outside the highway right-of-way for exterior land uses and acoustical treatment for interior land uses to improve a buildings noise reduction properties. ' The Caltrans policy requires the line of sight between the top of a truck stack (11.5 feet above the roadway grade) and an observer in a private outdoor living area should be interrupted by a noise barrier and that outdoor living areas ' be mitigated a minimum of 5 dBA or more to achieve a peak hour Leq noise level of less than 67 dBA. Additional guidelines to be considered in evaluating the feasibility of a noise barrier as an abatement measure are: o The number of dwelling units benefited should be ' large enough such that the barrier cost per receptor makes the barrier reasonable; o The structural design of the barrier should be feasible; 23 a w w a W H N z a � H A a 0 H IX w E-i z H p FC4 0 Cq •rl rop N %D O t3l4J d' ,-I a) O O a H N 1 N b r1 $4 a) (1) 0 4J > •rl U U $4 •r., a a� �o b 4-1 W a!a)x a -r-4 w 0 z cM r-1 N si' LO LO d' d' d' N] rn %O h O1 O h %O W w w x x 0 N N N N 'O O H H OU O O a a a a 4-4J E-+A PM HA HA HA HA O N HW HW MW En Ea toW a) 0 �0 z0 xo w0 x0 xo HU UWUUUUHHHHU 33 3 3 33ww>>4>+>4 AzAzzAPQ EA zA xzxz Oz Oz Oz Oz a a a 0 x >+ OU W U >a H >~ x mu D �n E4 4 °x H v a M 4H UH xE-1 UUi >{x a H u H0 wad aO 00 0 P F4 a U d-) h 00 O N n a a a a a a w H W H U W a x U i� M W I H h zz wa H zH WH AW 4 E-+ z Ww haw rw M 14 HA UO Ho ZH v°z A Ha AW a� H H ;.7 0 xz si' N I o The acceptance of a noise barrier and its aesthetic ' impacts will reflect the opinion of impacted residents and neighboring groups. n lI H 'J j 11 For those land uses whose primary activity are indoors such as institutional and school buildings, the indoor criteria of Leq= 52 dBA may be achieved by installing a closed environmental ventilation system, such as air conditioning, replacement windows or improved building insulation. A noise barrier analysis was prepared to determine the traffic noise reduction that would be provided by different height barriers at each of the impacted locations alone the Corridor. Where it is not possible to interrupt the line of sight of a heavy truck stack with a barrier of 16 feet or less mitigation is not considered feasible. 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The feasibility of achieving the Caltrans criteria of providing a minimum of 5 dBA reduction and reducing the traffic noise level to below Leq= 67 dBA are considered in this analysis. Barrier heights are limited to 14 feet above the pavement surface when located within 15 feet of the traveled way and 16 feet when located 15 feet or more from the travelled way. Barriers on roadway structures would be limited to a maximum height of 6 feet to be structurally feasible. The recommended barrier heights and locations, listed in Table 13 and shown on Figure 11, are discussed below for those sites where a noise impact has been predicted. Site R2 - Avenida Los Cerritos: A 16-foot barrier is recommended for both the mainline roadway and the northbound on ramp. Site R3 through R10 would require a continuous noise barrier at the end of pavement at varying heights based on the existing topography elevation of these receptors: Sites R1 & R3 - San Juan School Building and Baseball Field: A 12-foot barrier is recommended at the end of pavement to protect the school playfields. The noise reduction provided by the barrier would also mitigate the noise impact at the main school building and would benefit the 20 relocatable classroom buildings. Site R4 - La Callebra: A 10-foot barrier is recommended at the end of pavement. Site R5 - Residences along E1 Horno: A 8-foot barrier is recommended at the end of pavement. Site R6 - Residences along E1 Horno: A 12-foot barrier is recommended at the end of pavement. Site R7 - Via San Vicerite: A 16-foot barrier is recommended at the end of pavement. Site R8 - Serra Park: A 16-foot barrier is recommended at the end of pavement. Site R9 - Paseo Loreto: A 8-foot barrier is recommended at the end of pavement. Site R10 - Calle Chuega: A 8-foot barrier is recommended at the end of pavement of the southbound on ramp. Site R12 & R13 - San Juan Apartments: A 10-foot barrier is recommended at the end of pavement. E 1 1 1 1 1 28 1 , Vq IN HIGHWAY :if-Otg Id , Ued " 3c tt cl A 4 W., 7 .. .946 BIC Od 71 GY6 Id 10 10 1 ®r JON I SERRA HOC 144S 0 F- 0 CD iilYllk ca 0 LD 0 cts a) rD cc LU 0 0 cc N, ui V)R— 0 MATCH N !VrA,' 9545-00 V Z 60 6. 4V# 4 9 6 so A,IW56 Ad j z IN Z A*f Fla' P4cic At cq- DR Vr 66*904096 Od CO) MA klS' 0 0 ft !Ik .4 d ci qb 3a z 63 0 5- (D 0 -LLJ Y'A I J K L 3d ■ or, it IV 2 1A C#) 1\07F, cn Ilia, 43.00 co (.) co w cl 3d cc CD ts f 1 Cl) -00 ui MAT rK I__ — - --- LU W, LL C14 Oil, Xif A 71 ti 'I, qg))* 1113\ �V(f %Xd �.-!��i.� l . �������;• 1. � ii ` 7 a /lir", q R\ g, NM .5, rb CO It qm -14 LU CL cc Lu uj CD 0 w z T_ Lu LL CO IL— 0 'XI ca , Ao -LLJ- crj 1Y, co ul LO LLJ LL Site R14 & R15 - Spotted Bull Lane: The predominant source of noise at these sites is the traffic along the I-5 frontage road, Rancho Viejo Road. The receptors are up to 50 feet above the Corridor and would require a minimum 18 foot noise barrier to break the line of sight of an 11.5 foot truck stack. An 18-foot barrier would not meet Caltrans policy of reducing the traffic noise levels by 5 dBA or more due to the noise contribution from the Rancho Viejo Road traffic movements. Site R16 - Montessori School: The school building is an air conditioned wood frame structure. To improve the building's noise reduction properties replacement windows and additional building insulation is recommended. Sites R18 & R19 - Capistrano Valle H..-S-. Building and Tennis Courts: A noise barrier at these sites is not feasible because of the location of these receptors approximately 80 feet above the Corridor. A barrier is recommended at the edge of the school property. The height and location of the barrier to be determined during final design. Site R20 - Avenido Del Caballo: A 6-foot barrier is recommended at the elevated roadway structure for Option #1. For Option #2 the receptors are a further distance from the Corridor. With the Corridor mitigated with 6-foot noise barrier at the elevated roadway structure,. other sources of traffic noise would exceed 67 dBA . Site R22 & R23 - Bridgeport Plaza: A barrier is recommended at the right of way varying in height from 10 to 16 feet. Site R24 Laguna Niguel Town Homes: A barrier located at the end of pavement would need to be 1,8 feet high to break the line of sight. This height barrier would not be considered feasible and would not provide a 5 dBA or more noise reduction. As an alternative, a barrier is recommended at the property line of Laguna Niguel Town Homes. The height of the barrier would be determined during preliminary design subject to approval of the property owners. Site R25 - Niguel Development: A 10-foot barrier is recommended at the end of pavement. Site R26 - Nellie Gail: There are -existing noise barriers at this location. A 18-foot noise barrier at the right of way would provide 3 dBA reduction and is not recommended since it would not provide a 5 dBA or more noise reduction. A barrier at the Nellie Gail property line is recommended subject to approval of the property owners. Site R27 - Del Prodo Townhouses: A 8-foot barrier is ■ recommended at the right of way. Site R28 - Nellie Gail: A 12-foot barrier is recommended at the right of way. Site R29 - Laguna Garden Apartments: A 8-foot barrier is recommended at the end of pavement. 29 1 Site R31 - Quail Creek Apartments: A 10-foot barrier is recommended at the end of pavement. Site R33 - Morningside Condominiums: A 8-foot barrier is recommended at the right of way. Sites R34 through R38 - Aliso Viejo Development: A barrier is recommended for both sides of the Corridor varying in height from 8 to 12 feet at the right of way. Sites R40 & R41 - Club Laguna Apartments: These receptors are elevated above the corridor representing the Apartments which extend along the Corridor and are also setback along E1 Toro Road. A 8-foot barrier at the right of way would mitigate the portion of the Apartments along the Corridor (R40) but would not mitigate the receptors at Site R41 where the topography away from the Corridor changes. A 8-foot barrier is recommended at the property line of the Club Laguna Apartments. Site R42 - State Park: A barrier would not be required at this location because there would not be any human access through the park to the Corridor right of way. Site R43a - Bonita Creek Park: A 12-foot barrier is recommended at the edge of pavement. Sites R45, R46 & R47 - Bristol Street Businesses and Houses: The predominant noise source at these sites is the traffic along Bristol Street. Providing a noise barrier along the Corridor would only provide a minimal noise reduction of 1 dB. A barrier is not recommended at these sites. i 1 1 I 30 °� 8.0 CONSTRUCTION NOISE Construction noise represents a short term impact on existing noise levels. The duration and level of construction noise is dependent of the different phases of activity: - Ground clearing g includin demolition and removal of existing structures, trees, rocks and soil; - Excavation; - Placement of foundations and roadbeds; - Erection of structures including bridges and retaining walls; - Finishing, including filling, grading, paving, �4 landscaping and cleanup operations. Typically the first two.phases, ground clearing and excavations generate the highest noise levels. Noise generated by construction equipment, including trucks, graders, bulldozers, concrete mixers and portable generators can reach levels in the range of 67 dBA to 98 d-BA at 50 feet. Construction equipment noise comes under the control of the Environmental Protection Agency's Noise Control Program (Part 204 of Title 40, Code of Federal Regulations). Presently, air compressors are the only equipment under strict regulation, and no new regulations are currently under consideration. Noise levels for equipment which might be used for the excavation and construction of the proposed project are presented in Figure 12. The noise levels presented are at a reference distance of 50 feet. The construction equipment noise levels decrease at a rate of approximately 6 dBA per doubling of the distance. Therefore, at 100 feet the noise levels will be about 6 dBA less than the levels shown at 50 feet. Similarly, at 200 feet the noise levels would be 12 dBA less than shown. Intervening structures or topography can act as a noise barrier and reduce noise levels further. According to land use maps provided, residential areas currently exist or are planned to be constructed adjacent to several areas along the corridor alignments. Construction activities when close to residential areas should comply with the Orange County Noise Ordinance. The ordinance exempts construction activities "provided said activities do not take place between the hours of 8:00 p.m. and 7i00 a.m. on weekdays, including Saturday, or at any time on Sunday or a Federal holiday." Compliance with the Noise Ordinance usually provides acceptable mitigation for any construction noise impact. Haul trucks and equipment carriers accessing the project site can generate annoying levels of noise if passing through residential areas. Haul trucks and equipment carriers should be routed whenever possible away from residential areas: If this is not possible, their activities should follow the time limitations contained in the Noise Ordinance for construction activities Specifically, they should only operate during 31 A -Weighted Sound Level (dBA) at 50 feet 60 70 80 90 100 110 Compact (rollers) Front loaders Backhoes Tractors Scrapers, graders Pavers Trucks Concrete mixers Concrete pumps Cranes (movable) Cranes (derrick) Pumps Generators Compressors, Pneumatic wrenches Jackhammers and drills Pile drivers (peak levels) Vibrators Saws I I. ��' �� ' . -.. ■�� •� .� �■ I. Source: "Handbook Of Noise Control," By Harris, 1979. Figure 12 Construction Equipment Noise D weekdays between 7:00 a.m. and 8:00 p.m. 8.1 Blasting Vibrations Blasting will occur at selected locations along the Corridor to remove rock. The criteria that is used -to define the acceptability of blasting vibration is 2.0 inches per second peak particle velocity at the nearest structure to the blasting site. The weight of the blast charges can be controlled to limit the blasting vibration where structures are within 500 feet from the blast site. 8.2 Mitigation Measures Mitigation measures will be required to mitigate short term construction noise impacts on existing noise sensitive land uses. Note that measures to protect existing residential areas should be re-evaluated in.greater detail when preliminary design is prepared. Compliance with the Orange County Ordinance will mitigate impacts associated with construction noise. To comply with the ordinance, most construction activities when adjacent to residential uses, will be limited to daytime hours (7:00 a.m. to 8:00 p..m.) on Monday through Saturdays. The high number of heavy trucks traffic involved with construction activities could potentially create undesirable noise levels. Therefore, the location of haul routes or construction equipment and construction related vehicles should be oriented away from existing residential land other noise sensitive land uses. A 1 I i 1 32 I REFERENCES Barry, T.M. and J. A. Reagan. "FHWA Highway Traffic Noise Prediction Model," Report No. FHWA-RD-77-108, Federal Highway Administration, Washington, D.C., December 1978. Rudder, F. F. et al. "Users Manual, FHWA Level 2 Highway Traffic Noise Prediction Model, STAMINA 1.0," Report No. FHWA-RD-78-138, Federal Highway Administration, Washington, D.C., July 1978. Wesler, J. E. "Manual for Highway Noise Prediction Report No,. DOT-TSC-FHWA-72-1, Department of Transportation, Federal Highway Administration, Washington, D. D., March 1972. FHWA, 1982 Federal Highway Policy Manual (FHPM) Volume 7, Chapter 7, Section 3, "Procedures for Abatement of Highway Traffic Noise and Construction Noise" (FHPM 7-7-3). 1 I 1 33 1 I 1 I 1 1 APPENDIX A i STAMINA 2: TRAFFIC NOISE PREDICTION MODEL SAMPLE OUTPUT FILES; RECEPTORS R34 & R35 I 1 n 1 1 1 1 ****STAMINA2 GRAPHICS SUPPLEMENT* DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. GEOMETRY DATA OUTPUT -------------------- DATE: 11/18/1989 TIME: 19:02:37.61 TITLE: SAN JOAQUIN T.C.: NOISE ANALYSIS CONVENTIONAL (13.DAT) BARRIER HEIGHT SYMBOL CODE: CODE CH in ft.): SCALE: • roadway points H < 8 x-direction x station points ® 8=< H <18 1 in.= 97.5 m = x receiver points ® 18=< H <12 Be m RD roadway ® 12=< H <14 B barrier ® 14=< H <16 164 ft noise contour ,rig, 16=< H <18 !_d-direction C) noise contribution(dba) ® 18=< H <20 1 in.= 97.5 m = (T)total noise 20=< H <22 Be m contribution(dba) ® 22=< H <24 164 ft A alpha factor ® S shielding factor 24=< H <26 ® 26=< H <28 ® 28=< H 320. 0 ft 320.0 ft SAN JOAQUIN T.C.S NOISE ANALYSIS CONVENTION$ RD Ri3 R 4 )KR34 R16 Rl6 ~ 82 R21 R28 RDii 18 T10 ISO RD R19 RR17 RD 9 Hi _ 3 02 H03 PTO R2RD 2 H(RD10 T02 PT8 RD 6 07 lyT D 4 3TOI R81 R02 PT04 06 H86 XR35 R8 PT06 _ 07 R04 R 8 RD ' R ; RIP 2 1 R86 STAMINA 2.0/BCR FHWA VERSION (MARCH 1982) TRAFFIC NOISE PREDICTION MODEL DEVELOPED UNDER CONTRACT BY BBN MODIFIED FOR CALIFORNIA VEHICLE NOISE EMISSIONS LEVELS *** REGRESSION EQUATIONS *** (INPUT UNITS- ENGLISH , OUTPUT UNITS- ENGLISH ) SAN JOAQUIN T.C.: NOISE AWALYSIS CONVENTIONAL 6-7PM TRAFFIC (13.DAT) PROGRAM INITIALIZATION PARAMETERS HEIGHT CODE DESCRIPTION .00 1 RECEIVER HEIGHT ADJUSTMENT '1.00 2 A -WEIGHTED SOUND LEVEL ONLY .00 3 HEIGHT ADJUSTMENT FOR PASSENGER CARS (CARS) 8.00 4 HEIGHT ADJUSTMENT FOR HEAVY TRUCKS (HT) 2.30 5 HEIGHT ADJUSTMENT FOR MEDIUM TRUCKS (MT) ROADWAY 1 RDWY 1 ; NS SAN JOAQUIN STA 9638-9662 BET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLESlHOUR SPEED CARS 4430. 45. HT 130. 45. MT 310. 45. ------------COORDINATES------------- X Y Z GRADE PT01 480. 1030. 230. 1 PT02 1070. 1100. 244. 1 PT03 PT04 1500. 1090. 256. 1 2200. 1025. 380. 1 PT05 2950. 960. 328. 1 �J ROADWAY Z RDWY 2 SB SAN JOAQUIN STA 9662-9638 BET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 5010. 55'. HT 150. 55. MT 340. 55. ------------COORDINATES------------- X Y Z GRADE PT06 295.0. 1080. 328. 0 PT07 2200. 1150. 280. 0 PT08 1500. 1210. 256. 0 ` PT09 1060. 1230. 244. 0 PT10 460. 1180. 230. 0 ROADWAY 3 RDWY 3 ; HOV SAN JOAQUIN NS STA 9638-9662 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 487. 55. HT 0. 30. MT 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H01 480. 1080. 230. 1 H02 1070. 1140. 244. 1 H03 1500. 1130. 256. 1 H04 2200. 1070. 280. 1 H05 2950. 1005. 328. 1 ROADWAY 4 RDWY 4 ; HOV SAN JOAQUIN SS STA 9662-9638 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 550. 55. HT 0. 30. MT 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H06 2950. 1040. 328. 0 H07 2200. 1100. 280. 0 H08 1500. 1165. 256. 0 H09 1060. 1180. 244. 0 H10 480. 1120. 328. 0 ROADWAY 5 RDWY 5 ; SAN JOAQUIN EXIT RAMP TO ALISO CREEK NS VEHICLE TYPE VEHICLES/HOUR SPEED CARS 546. 30. HT 16. 30. MT 38. 30. ------------ COORDINATES ------------- X Y Z GRADE R02 1650. 1020. 262. 0 R03 1750. 960. 268. 0 R04 2220. 855. 280. 0 R05 2615. 530. 310. 0 R06 3000. 490. 328. 0 ROADWAY 6 RDWY 6 ; SAN JOAQUIN NB SERVICE RD VEHICLE TYPE VEHICLES/HOUR SPEED CARS 273. 30. HT 8. 30. MT 19. 30. ------------ COORDINATES ------------- X Y 2 GRADE R02 1650. 1020. 262. 1 R07 2950. 900. 328. 1 ROADWAY 7 RDWY 7 ; SAN JOAQUIN ENTRANCE TO SERVICE RD FROM ALISO CREEK VEHICLE TYPE VEHICLES/HOUR SPEED CARS 614. 30. HT 18. 30. MT 43. 30. ------------ COORDINATES ------------- X Y Z GRADE R12 2980. 730. 328. 0 R11 2870. 550. 320. 0 R10 2700. 550. 320. 0 R09 R08 '2620. 2700. 720. 860. 320. 320. 0 0 R07 2950. 900. 328. 0 ROADWAY 8 RDWY 8 ; SAN JOAQUIN ENTRANCE RAMP FROM ALISO TO SB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 68. 30. HT MT 2. 5. 30. 30. ------------ COORDINATES ------------- X Y Z GRADE R13 3020. 1860. 328. 0 R14 2970. 1600. 328. 0 R15 2880. 1410. 322. 0 R16 2770. 1300. 316. 0 R17 2630. 1240. 310. 0 R18 2450. 1230. 298. 0 R19 2160. 1210. 280. 0 ROADWAY 9 RDWY 9 ; SAN JOAQUIN SERVICE RD/RAMP TO SS VEHICLE TYPE VEHICLES/HOUR SPEED CARS 888. 30. HT 26. 30. MT 61. 30. ------------ COORDINATES ------------- X Y Z GRADE R23 2940. 1150. 328. 0 R19 2160. 1210. 280. 0 ROADWAY 10 RDWY 10; SAN JOAQUIN NS SERVICE RD VEHICLE TYPE CARS VEHICLES/HOUR 819. SPEED 30. HT 24. 30. MT 57. 30. ------------ COORDINATES ------------- X Y Z GRADE PT01 480. 1030. 230. 1 R01 890. 1040. 238. 1 R02 1650. 1020. 262. 1 ROADWAY 11 RDWY 11; SAN JOAQUIN SERVICE RD/RAMP TO SB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 956. 30. HT 30. MT 66 . 66. 30. ------------ COORDINATES ------------- R19 X 2160. Y 1210. Z GRADE 280. 0 R20 1510. 1270. 256. 0 R21 1280. 1280. 250. 0 R22 PT10 840. 460. 1270. 1180. 238. 230. 0 0 RECEPTOR CO-ORDINATES ............ COORDINATES ------------- X Y Z R34 1490. 1360. 261. R35 1400. 940. 257. 22*0.5 SHIELDING FACTORS 22*0.0 SAN JOAQUIN T.C.: NOISE ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (13.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R34 72.7 1.7 74.6 72.4 70.3 R35 72.2 2.0 74.2 71.7 69.2 1 1 I 1 1 1 ****STAMINA2 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLASP INC, GEOMETRY DATA OUTPUT -------------------- DATE: 11/18/1989 TIME: 19:06:24.64 TITLE: SAN JOAQUIN T.C.: NOISE ANALYSIS OPTIMISTIC_ (13.DAT) SYMBOL CODE: • roadway points x station points x receiver points RD roadway B barrier noise contour C) noise contribution(dba) (T)total noise contribution(dbe) A alpha factor S shielding factor BARRIER HEIGHT CODE CH in ft.): mm H < 8 ® 8=< H <10 ® l0=<- H <12 ® 12=< H <14 ® 14=< H <16 16=< H <18 ® 18=< H <20 20=< H <22 ® 22=< H <24 ® 24=< H <26 ® 26=< H <28 ® 28=< H SCALE: x-direction 1 in. = 97.5 m = 56 m 164 ft W-direction 1 in. = 97.5 m Be m 184 ft 320. 0 ft 320. 0 ft SAN JOAQUIN T.C.: NOISE ANALYSIS OPTIMISTIC e xR34 (13.DAT) PT0 RD 6 My4 TR R02 PT04 H06 R35 R0 PT86 e R04 R0871 RD ' R /9 Ri R STAMINA 2.0/BCR FHWA VERSION (MARCH 1982) TRAFFIC NOISE PREDICTION MODEL DEVELOPED UNDER CONTRACT BY BBN MODIFIED FOR CALIFORNIA VEHICLE NOISE EMISSIONS LEVELS *** REGRESSION EQUATIONS *** (INPUT UNITS- ENGLISH , OUTPUT UNITS- ENGLISH ) SAN JOAQUIN T.C.: NOISE ANALYSIS OPTIMISTIC 6-7PM TRAFFIC (13.DAT) PROGRAM INITIALIZATION PARAMETERS HEIGHT CODE DESCRIPTION .00 1 RECEIVER HEIGHT ADJUSTMENT 1.00 2 A -WEIGHTED SOUND LEVEL ONLY .00 3 HEIGHT ADJUSTMENT FOR PASSENGER CARS (CARS) 8.00 4 HEIGHT ADJUSTMENT FOR HEAVY TRUCKS (HT) 2.30 5 HEIGHT ADJUSTMENT FOR MEDIUM TRUCKS (MT) ROADWAY 1 RDWY 1 ; NS SAN JOAQUIN STA 9638-9662 BET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLES/HOUR SPEED CARS' 3257. 45. HT 0. 45. MT 2330. 45. ------------COORDINATES------------- X Y Z GRADE PT01 480. 1030. 230. 1 PT02 1070. 1100. 244. 1 PT03 1500. 1090. 256. 1 PT04 2200. 1025. 380. 1 PT05 2950. 960. 328. 1 ROADWAY 2 RDWY 2 ; SB SAN JOAQUIN STA 9662-9638 BET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 3635. 55. HT 110. 55. MT 250. 55. ------------COORDINATES------------- PT06 X Y Z 2950. 1080. 328. GRADE 0 PT07 2200. 1150. 280. 0 PT08 1500. 1210. 256. 0 PT09 1060. 1230. 244. 0 PT10 460. 1180. 230. 0 ' ROADWAY 3 RDWY 3 HOV SAN JOAQUIN SB STA 9638-9662 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 662. 55. HT 0. 30. MT 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H01 480. 1080. 230. 0 H02 1070. 1140. 244. 0 H03 1500. 1130. 256. 0 H04 2200. 1070. 280. 0 H05 2950. 1005. 328. 0 ROADWAY 4 RDWY 4 ; HOV SAN JOAQUIN SO STA 9662-9638 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 662. 55. HT 0. 30. MT 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H06 2950. 1040. 328. 0 H07 2200. 1100. 280. 0 H08 1500. 1165. 256. 0 H09 1060. 1180. 244. 0 H10 480. 1120. 328. 0 ROADWAY 5 RDWY 5 ; SAN JOAQUIN EXIT RAMP TO ALISO CREEK NO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 546. 30. HT 16. 30. MT 38. 30. ------------ COORDINATES ------------- X Y Z GRADE R02 1650. 1020. 262. 0 R03 1750. 960. 268. 0 R04 2220. 855. 280. 0 R05 2615. 530. 310. 0 R06 3000. 490. 328. 0 ROADWAY 6 RDWY 6 ; SAN JOAQUIN NO SERVICE RD VEHICLE TYPE VEHICLES/HOUR SPEED CARS 273. 30. HT 8. 30. MT 19. 30. ------------ COORDINATES ------------- X Y Z GRADE R02 1650. 1020. 262. 1 R07 2950. 900. 328. 1 ROADWAY 7 RDWY 7 ; SAN JOAQUIN ENTRANCE TO SERVICE RD FROM ALISO CREEK VEHICLE TYPE VEHICLES/HOUR SPEED CARS 614. 30. HT 18. 30. MT 43. 30. ------------ COORDINATES ------------- X Y Z GRADE R12 2980. 730. 328. 0 R11 2870. 550. 320. 0 R10 2700. 550. 320. 0 R09 R08 -2620. 720. 2700. 860. 320. 320. 0 0 R07 2950. 900. 328. 0 ROADWAY 8 RDWY 8 ; SAN JOAQUIN ENTRANCE RAMP FROM ALISO TO SB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 68. 30. HT 2. MT 5. 30. 30. ------------- COORDINATES ------------- R13 X Y 3020. 1860. Z 328., GRADE 0 R14 2970. 1600. 328. 0 R15' 2880. 1410: 322. 0 R16 2770. 1300. 316. 0 ' R17 2630. 1240. 310. 0 R18 2450. 1230. 298. 0 R19 2160. 1210. 280. 0 ROADWAY 9 RDWY 9 ; SAN JOAQUIN SERVICE RD/RAMP TO SS VEHICLE TYPE VEHICLES/HOUR SPEED CARS 888. 30. HT 26. 30. MT 61. 30. ------------ COORDINATES ------------- X Y 2 GRADE R23 2940. 1150. 328. 0 R19 2160. 1210. 280. 0 ROADWAY 10 RDWY 10; SAN JOAQUIN NB SERVICE RD VEHICLE TYPE VEHICLES/HOUR SPEED CARS 819. 30. HT 24. 30. MT 57. 30. ------------ COORDINATES ------ ------- X Y Z GRADE PT01 480. 1030. 230. 1 R01 890. 1040. 238. 1 R02 1650. 1020. 262. 1 ROADWAY 11 RDWY 11; SAN JOAQUIN SERVICE RD/RAMP TO SS VEHICLE TYPE VEHICLES/HOUR SPEED CARS 956. 30. HT 28. 30. MT 66. 30. ------------ COORDINATES ------------- .X Y 2 GRADE R19 2160. 1210. 280. 0 R20 1510. 1270. 256. 0 R21 1280. 1280. 250. 0 R22 840. 1270. 238. 0 PT10 460. 1180. 230. 0 RECEPTOR CO-ORDINATES ............ COORDINATES ------------- X Y Z R34 1490. 1360. 261. R35 1400. 940. 257. 22*0.5 SHIELDING FACTORS 22*0.0 SAN JOAQUIN T.C.: NOISE ANALYSIS OPTIMISTIC 6-7PM TRAFFIC (13.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R34 71.7 1.9 73.7 71.3 68.8 R35 71.1 2.2 73.4 70.6 67.8 1 1 I r i ****STAMINA2 GRAPHICS SUPPLEMENT"" DEVELOPED AT PARSONS ERINCKERHOFF QUADE & DOUOLASp INC., GEOMETRY DATA OUTPUT -------------------- DATES 11/18/1989 TIME: 19:88:11.67 TITLE: SAN JOAQUIN T.C.: NOISE ANALYSIS CONSERVATIVE (13.DAT) SYMBOL CODE: roadway points x station points x receiver points RD roadway B barrier noise contour C) noise contribution(dba) (T)total noise contribution(dba) A alpha factor S shielding factor BARRIER HEIGHT CODE CH in ft.): on H < 8 ® 8=< H <18 ® 18=< H <12 ® 12=< H <14 ® 14=< H <18 16=< H <18 ® 18P< H <28 20=< H <22 ® 22=< H <24 ® 24=< H <26 ® 26=< H <28 ® 28=< H SCALE: x-direction 1 in.= 97.5 m = Be m 164 ft W-direction ----------- 1 in.= 97.5 m = Be m 164 ft 320.8 ft 320.8 ft SAN JOAQUIN T.C.t NOISE ANALYSIS CONSERVATIVE (13.DAT) H(RD1 MR34 WR36 RD Ri3 R 4 R16 16 RD11 R1? R19 R18 RD 9 PT111"'Plil R23 2 RD 6 HN4 T D 4' !2 PT04 as H06 R8 PT06 R04 R88 07 RD ' R09 R12 R0 10 R1 i�Y R86 STAMINA 2.0/BCR FHWA VERSION (MARCH 1982) TRAFFIC NOISE PREDICTION MODEL DEVELOPED UNDER CONTRACT BY BBN MODIFIED FOR CALIFORNIA VEHICLE NOISE EMISSIONS LEVELS *** REGRESSION EQUATIONS *** (INPUT UNITS- ENGLISH , OUTPUT UNITS- ENGLISH ) SAN JOAQUIN T.C.: NOISE ANALYSIS CONSERVATIVE 6-7PM TRAFFIC (13.DAT) PROGRAM INITIALIZATION PARAMETERS HEIGHT CODE DESCRIPTION .00 1 RECEIVER HEIGHT ADJUSTMENT 1.00 2 A -WEIGHTED SOUND LEVEL ONLY .00 3 HEIGHT ADJUSTMENT FOR PASSENGER CARS (CARS) 8.00 4 HEIGHT ADJUSTMENT FOR HEAVY TRUCKS (HT) 2.30 5 HEIGHT ADJUSTMENT FOR MEDIUM TRUCKS (MT) ROADWAY 1 RDWY 1 ; NS SAN JOAQUIN STA 9638-9662'SET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 3207. 45. HT 110. 45. MT 260. 45. ------------COORDINATES------------- X Y Z GRADE PT01 480. 1030. 230. 1 PT02 1070. 1100. 244. 1 PT03 PT04 1500. 1090. 256. 1 2200. 1025. 380. 1 PT05 2950. 960. 328. 1 ROADWAY 2 RDWY 2 ; SB SAN JOAQUIN STA 9662-9638 BET ALISO CREEK & ALICIA VEHICLE TYPE VEHICLES%HOUR SPEED CARS 4865. 30. HT 130. 30. MT 300. 30. ------------COORDINATES------------- PT06 X Y Z GRADE 2950. 1080. 328. 0 PT07 2200. 1150. '280. 0 PT08 1500. 1210. 256. 0 PT09 1060. 1230. 244. 0 PT10 460. 1180. 230. 0 ROADWAY 3 RDWY 3 ; HOV SAN JOAQUIN SS STA 9638-9662 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 360. 55. HT 0. 30. MT - 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H01 480. 1080. 230. 0 H02 1070. 1140. 244. 0 H03 1500. 1130. 256. 0 H04 2200. 1070. 280. 0 H05 2950. 1005. 328. 0 ROADWAY 4 RDWY 4 ; HOV SAN JOAQUIN SB STA 9662-9638 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 360. 55. HT 0. 30. MT 0. 30. ------------ COORDINATES ------------- X Y Z GRADE H06 2950. 1040. 328. 0 H07 2200. 1100. 280. 0 H08 1500. 1165. 256. 0 H09 1060. 1180. 244. 0 HID 480. 1120. 328. 0 ROADWAY 5 RDWY 5 ; SAN JOAQUIN EXIT RAMP TO ALISO CREEK NB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 546. 30. HT 16. 30. MT 38. 30. ------------ COORDINATES ------------- X Y Z GRADE R02 1650. 1020. 262. 0 R03 1750. 960. 268. 0 R04 2220. 855. 280. 0 R05 2615. 530. 310. 0 R06 3000. 490. 328. 0 ROADWAY 6 RDWY 6 ; SAN JOAQUIN NB SERVICE RD VEHICLE TYPE VEHICLES/HOUR SPEED CARS 273. 30. HT 8. 30. MT 19. 30. ------------ COORDINATES ------------- X Y Z GRADE R02 1650. 1020. 262. 1 R07 2950. 900. 328. 1 ROADWAY 7 RDWY 7 ; SAN JOAQUIN ENTRANCE TO SERVICE RD FROM ALISO CREEK VEHICLE TYPE VEHICLES/HOUR SPEED CARS 614. 30. HT 18. 30. MT 43. 30. ------------ COORDINATES ------------- X Y Z GRADE R12 2980. 730. 328. 0 R11 2870. 550. 320. 0 R10 2700. 550. 320. 0 R09 R08 2620. 2700. 720. 860. 320. 320. 0 0 R07 2950. 900. 328. 0 ROADWAY 8 RDWY 8 SAN JOAQUIN ENTRANCE RAMP FROM ALISO TO SB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 68. 30. HT 2. 30. MT 5. 30. ------------COORDINATES------------- R13 X 3020. Y 1860. 2 328. GRADE 0 R14 2970. 1600. 328. 0 R15 2880. 1410. 322. 0 R16 2770. 1300. 316. 0 R17 2630. 1240. 310. 0 R18 2450. 1230. 298. 0 R19 2160. 1210. 280. 0 ROADWAY 9 RDWY 9 ; SAN JOAQUIN SERVICE RD/RAMP TO SS VEHICLE TYPE VEHICLES/HOUR SPEED CARS HT 888. 26. 30. 30. MT 61. 30. ------------COORDINATES------------- X Y 2 GRADE R23 2940. 1150. 328. 0 R19 2160. 1210. 280. 0 ROADWAY 10 RDWY 10; SAN JOAQUIN NB SERVICE RD VEHICLE TYPE VEHICLES/HOUR SPEED CARS 819. 30. HT 24. 30. MT 57. 30. ------------COORDINATES------------- X Y 2 GRADE PT01 480. 1030. 230. 1 R01 R02 890. 1650. 1040. 1020. 238. 262. 1 1 ROADWAY 11 RDWY 11; SAN JOAQUIN SERVICE RD/RAMP TO SB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 956. 30. HT 28. 30. MT 66. 30. ------------ COORDINATES ------------- X Y Z GRADE R19 2160. 1210. 280. 0 R20 1510. 1270. 256. 0 R21 1280. 1280. 250. 0 R22 840. 1270. 238. 0 PT10 460. 1180. 230. 0 RECEPTOR CO-ORDINATES ------------ COORDINATES ------------- X Y Z R34 1490. 1360. 261. R35 1400. 940. 257. 22*0.5 SHIELDING FACTORS 22*0.0 SAN JOAQUIN T.C.: NOISE ANALYSIS CONSERVATIVE 6-7PM TRAFFIC (13.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R34 69.8 2.2 72.1 69.2 66.4 R35 70.5 2.6 73.0 69.7 66.4 1 1 1 1 1 1 1 1 LI 1 APPENDIX B STAMINA 2: TRAFFIC NOISE PREDICTION MODEL SAMPLE BARRIER ANALYSIS u 1 1 1 1 1 1 11 I 1 1 1 1 ****STAMINA2 GRAPHICS SUPPLEMENT**** DEVELOPED AT PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. GEOMETRY DATA OUTPUT -------------------- DATE: 03/15/1990 TIME: 11:07:26.89 TITLE: SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) SYMBOL CODE: • roadway points x station points x receiver points RD roadway B barrier noise contour C) noise contribution(dba) (T)total noise contribution(dba) A alpha factor S shielding factor BARRIER HEIGHT CODE (H in ft.): SCALE: H < 8 x-direction ® 8=< H <10 1 in.= 312.4 m = 1025.0 ft ® 10=< H <12 50 m ® 12=< H <14 164 ft ® 14=< H <16 kI1UCC4{ 16=< H <18 y-direction ® 18=< H <20 1 in.= 312.4 m = 1025.0'ft 20=< H <22 60 m ® 22=< H <24 164 ft ® 24=< H <26 ® 26=< H <28 ® 28=< H SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) 03� 1 _P —R4 M R23 FP' Il x R2 O4L R4 XR5 MR6 xR7 MRS *R9 PT13 PTia pT1 PT04 HINb PT0 U. 1 1 SAN OOAQUIN T.C.2 BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) 18 1 11 B 2 OR2 O4L _ol 8 1 STAMINA 2.0/BCR FHWA VERSION (MARCH 1982) TRAFFIC NOISE PREDICTION MODEL DEVELOPED UNDER CONTRACT BY BBN MODIFIED FOR CALIFORNIA VEHICLE NOISE EMISSIONS LEVELS *** REGRESSION EQUATIONS *** (INPUT UNITS- ENGLISH , OUTPUT UNITS- ENGLISH ) SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) PROGRAM INITIALIZATION PARAMETERS HEIGHT CODE DESCRIPTION .00 1 RECEIVER HEIGHT ADJUSTMENT 1.00 2 A -WEIGHTED SOUND LEVEL ONLY .00 3 HEIGHT ADJUSTMENT FOR PASSENGER CARS (CARS) 8.00 4 HEIGHT ADJUSTMENT FOR HEAVY TRUCKS (HT) 2.30 5 HEIGHT ADJUSTMENT FOR MEDIUM TRUCKS (MT) ROADWAY 1 RDWY 1 ; NS I5 STA 510-595 BET ORTEGA & JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 6380. 45. HT 261. 45. MT 609. 45. ------------ COORDINATES ------------- X Y Z GRADE PT01 120. 1030. 108. 0 PT02 830. 830. 118. 0 PT03 1810. 710. 136. 0 ROADWAY 2 RDWY 2 ; NB I5 STA 510-595 BET ORTEGA & JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 7128. 45. HT 291. 45. MT 680. 45. ------------ COORDINATES ------------- X Y Z GRADE PT03 1810. 710. 136. 0 PT04 3500. 720. 176. 0 PT05 4975. 740. 218. 0 PT06 6000. 750. 228. 0 PT07 6280. 750. 228. 0 ROADWAY 3 RDWY 3 ; SS I5 STA 595=510 BET ORTEGA & JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 7524. 45. HT 308. 45. MT 718. 45. ------------ COORDINATES ------------- X Y Z GRADE PT09 8300. 860. 222. 0 PT10 6700. 860. 226. 0 ROADWAY 4 RDWY 4 ; SO I5 STA 595=510 BET ORTEGA & JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 7568. 45. HT 310. 45. MT '722. 45. ------------ COORDINATES ------------- X Y Z GRADE PT10 6700. 860. 226. 0 PT11 6000. 850. 228. 0 PT12 4975. 840. 218. 0 PT13 3500. 830. 176. 0 PT14 1800. 820. 136. 0 ROADWAY 5 RDWY 5 ; SO I5 STA 595=510 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 6754. 45. HT 276. 45. MT 645. 45. ------------ COORDINATES ------------- X Y 2 GRADE PT14 1800. 820. 136. 0 PT15 820. 930. 118. 0 PT16 140. 1130. 108. 0 'ROADWAY 6 RDWY 6 ; NO EXIT RAMP TO ORTEGA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 318. 30. HT 10. 30. MT 22. 30. ------------ COORDINATES ------------- X Y Z GRADE R1 100. 950. 108: 0 R2 800. 670. 145. 0 ROADWAY 7 RDWY 7 ; NO ENTRANCE RAMP FROM ORTEGA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 774. 30. HT 23. 30. MT 54. 30. ------------ COORDINATES ------------- X Y Z GRADE R3 840. 660. 136. 0 PT3 1810. 710. 136. 0 ROADWAY 8 RDWY 8 ; SO EXIT RAMP TO ORTEGA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 842. 30. HT 25. 30. MT' 58. 30. ------------ COORDINATES ------------- X Y Z GRADE PT14 1800. 820. 136. 0 R4 1260. 940. 136. 0 R5 825. 1080. 135. 0 ROADWAY 9 RDWY 9 ; SO ENTRANCE RAMP FROM ORTEGA VEHICLE TYPE VEHICLES/HOUR SPEED CARS 410. 30. HT 12. 30. MT 28. 30. ------------ COORDINATES ------------- X Y Z GRADE R6 780. 1090. 145. 0 R7 120. 1200. 108. 0 ROADWAY 10 RDWY 10; ORTEGA HWY W8 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 1820. 30. HT 54. 30. MT 126. 30. ------------ COORDINATES ------------- X Y Z GRADE 01 840. 300. 145. 0 R3 840. 660. 145. 0 ROADWAY 11 RDWY 11; ORTEGA HWY W8 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 1820. 30. HT 54. 30. MT 126. 30. ------------ COORDINATES ------------- X Y Z GRADE R3 840. 660. 145. 0 R5 825. 1080. 135. 0 ROADWAY 12 RDWY 12; ORTEGA HWY WB VEHICLE TYPE VEHICLES/HOUR SPEED CARS 1820. 30. HT 54. 30. MT 126. 30. ------------ COORDINATES ------------- X Y Z GRADE R5 825. 1080. 135. 0 02 "800. 1850. 125. 0 ROADWAY 13 RDWY 13; ORTEGA HWY ES VEHICLE TYPE VEHICLES/HOUR SPEED CARS 1365. 30. HT 40. 30. MT 94. 30. ------------ COORDINATES ------------- X Y Z GRADE 03 750. 1870. 125. 0 R6 780. 1090. 135. 0 ROADWAY 14 RDWY 14; ORTEGA HWY ES VEHICLE TYPE VEHICLES/HOUR CARS 1365. SPEED 30. HT 40. 30. MT 94. 30. ------------ COORDINATES ------------- X Y Z GRADE R6 780. 1090. 135. 0 R2 800. 670. 145. 0 ROADWAY 15 RDWY 15; ORTEGA HWY EB VEHICLE TYPE VEHICLES/HOUR CARS 1365. SPEED 30. HT 40. 30. MT 94. 30. ------------ COORDINATES ------------- X Y Z GRADE R2 04 800. 670. 800. 290. 145. 145. 0 0 ROADWAY 16 RDWY 16; NS EXIT RAMP TO JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 159. 30. HT 5. 30. MT 11. 30. ' ------------ COORDINATES------------- X Y Z GRADE PT7 6280. 750. 228. 0 R8 7800. 600. 209. 0 ROADWAY 17 RDWY 17 ; SB ENTRANCE RAMP FROM JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 46. 30. HT 1. 30. MT 3. 30. ------------ COORDINATES ------------- X Y Z GRADE R9 7780. 1040. 196. 0 PT10 6700. 860. 226. 0 ROADWAY 18 RDWY 18 ; JUNIPERO VEHICLE TYPE VEHICLES/HOUR SPEED CARS 1456. 30. HT 43. 30. MT 101. 30. ------------ COORDINATES ------------- X Y Z GRADE R8 7800. 600. 209. 0 R9 7780. 1040. 196. 0 S1 7780. 1500. 196. 0 ROADWAY 19 RDWY 19; NB I5 STA 510-595 VEHICLE TYPE VEHICLES/HOUR SPEED CARS 6974. 30. HT 285. 30. MT 666. 30. ------------ COORDINATES ------------- X Y Z GRADE PT07 6280. 750. 228. 0 PT08 8300. 750. 222. 0 BARRIER 1 TYPE(A) SOUTH BOUND SOUND BARRIER ON I-5 --------- COORDINATES ---------- X Y Z ZO DELZ 802 825. 1860. 133. 125. 0. BR5 860. 1115. 143. 135. BR4 1270. 960. 144. 136. B14 1790. 855. 144. 136. B13 3500. 860. 184. 176. 812 4960. 880. 226. 218. B11 6000. 895. 236. 228. B10 6700. 905. 234. 226. BR9 7730. 1150. 204. 196. BARRIER 2 TYPE(A) NORTH BOUND SOUND BARRIER ON 1-5 --------- COORDINATES ---------- X Y Z ZO DELZ P 0 BR3 900. 645. 144. 136. 3. B3 1805. 660. 144. 136. 64 3500. 685. 184. 176. RECEPTOR CO-ORDINATES ............ COORDINATES --- ---------- X Y 2 R2 1375. 470. 165. R3 1750. 900. 135. R4 2440. 920. 145. R5 2750. 1050. 145. R6 3060. 940. 163. R7 4070. 950. 210. R8 4800. 980. 235. R9 5770. 1000. 205.. R10 7130. 1030. 205. 171*0.5 SHIELDING FACTORS 171*0.0 1 1 1 1 1 I 1 1 0 1 11 EIGHT FOOT BARRIER RESULTS SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R2 68.7 1.0 69.8 68.6 67.3 R3 68.2 1.8 70.2 67.9 65.6 R4 67.2 1.7 69.1 66.9 64.7 R5 R6 65.4 68.5 1.4 1.8 66.9 65.1 63.4 70.4 68.1 65.8 R7 73.3 1.8 75.2 72.9 70.5 R8 72.9 1.5 74.5 72.6 70.6 R9 63.4 1.2 64.8 63.2 61.6 RIO 60.6 .9 61.6 60.5 59.3 1 I 1 t TEN FOOT BARRIER RESULTS SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R2 68.3 1.0 69.4 68.2 67.0 R3 66.6 1.6 68.3 66.3 64.3 R4 65.8 1.4 67.4 65.5 63.7 R5 R6 64.0 66.9 1.2 1.5 65.3 63.8 68.5 66.6 62.3 64.7 R7 72.0 1.5 73.6 71.7 69.8 R8 71.7 1.3 73.2 71.5 69.7 R9 62.3 1.1 63.5 62.1 60.7 R10 59.6 .9 60.7 59.5 58.4 1 u 1 7 C� 1 1 TWELVE FOOT BARRIER RESULTS **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(H) SIG L10 L50 L90 R2 67.9 1.0 69.0 67.8 66.6 R3 65.2 1.4 66.7 64.9 63.2 R4 64.5 1.3 65.9 64.3 62.7 R5 62.7 1.0 63.8 62.6 61.3 R6 65.5 1.3 66.9 65.3 63.6 R7 71.1 1.5 72.8 70.9 68.9 R8 70.9 1.4 72.4 70.6 68.9 R9 61.3 1.0 62.5 61.2 59.8 R10 58.8 .9 59.9 58.8 57.7 1 n 1 ri 1 1 I FOURTEEN FOOT BARRIER RESULTS SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEG(H) SIG L10 L50 L90 R2 67.4 1.0 68.6 67.3 66.1 R3 64.0 1.3 65.4 63.8 62.2 R4 63.4 1.1 64.7 63.2 61.8 R5 R6 61.5 64.2 .9 1.1 '62.6 65.5 61.4 64.1 60.3 62.6 R7 70.0 1.4 71.5 69.8 68.0 R8 70.0 1.3 71.5 69.8 68.2 R9 60.4 1.0 61.5 60.3 59.1 R10 58.3 .9 59.3 58.2 57.1 1 1 1 1 1 1 u SIXTEEN FOOT BARRIER RESULTS SAN JOAQUIN T.C.: BARRIER ANALYSIS CONVENTIONAL 6-7PM TRAFFIC (20.DAT) **** ORANGE 25 ROADS 850 RECP **** RECEIVER LEQ(N) SIG L10 L50 L90 R2 66.8 .9 67.8 66.7 65.5 R3 63.0 1.2 64.3 62.8 61.3 R4 62.5 1.0 63.7 62.3 61.0 R5 60.5 .8 61.5 60.4 59.4 R6 63.2 1.0 64.3 63.0 61.7 R7 68.7 1.2 70.1 68.5 66.9 R8 68.9 1.2 70.3 68.7 67.2 R9 59.7 .9 60.7 59.6 58.4 R10 57.8 .9 58.9 57.8 56.6 1 11 I 1 1 1 I �I L� 1 I� I' APPENDIX C DESIGN YEAR 2010 TRAFFIC DATA 0000e oe o000 ohoo o oMbort e r r .ev r O i L m 0 1111I O O b 0 b p O [[pV�1 � 0 0 0 0 0 0 0 O ro -e0 m b N O m W 1 Z H m I M I Y y m 0^! 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J 6 � I� -r ti N .p • Fj TIME HOURLY DISTRIBUTION OF TRAFFIC HOURLY VARIATION (%) ----------- ------------- 12mid to 1:00 am 0.33 1:00 am to 2:00 am 0.33 2:00 am to 3:00 am 0.34 3:00 am to 4:00 am ; 0.50 4:00 am to 5:00 am 0.50 5:00 am to 6:00 am 0.50 6:00 am to 7:00 am 0.50 7:00 am to 8:00 am 8.00 8:00 am to 9:00 am 8.00 9:00 am to 10:00 am 6.00 10:00 am to 11:00 am 6.00 11:00 am to 12 noon 6.00 NB SB ; 12 noon to 1:00 pm 7.00 NB SB 1:00 pm to 2:00 pm ; 6.00 NB SB ; 2:00 pm to 3:00 pm ; 7.00 NB SB 3:00 pm to 4:00 pm 8.50 NB SB 4:00 pm to 5:00 pm 8.50 NB ' SB 5:00 pm to 6:00 pm 8.50 NB ; SB ; 6:00 pm to 7:00 pm 8.50 NB SB ' 7:00 pm to 8:00 pm 3.00 8:00 pm to 9:00 pm i 3.00 9:00 pm to 10:00 pm 11 2.00 10:00 pm to 11:00 pm ; 0.50 11:00 pm to 12 mid. 0.50 TOTAL 100.00 ** Information shown for peak 6-hours not calculated for remainder of thi PEAK 8-HOUR DIRECTIONAL DISTRIB. ** M 50 50 4 51 48 5'2' 47 53 44 56 40 60 44 56 47 53 f only. Percentai 24 hours. PEAK 8-HOUR TRUCK I� des were 0 ;01 r! 0 4 2 2 9 CITY OF NEWPORT BEACH ' PLANNING DEPARTMENT � 3300' NEWPOR-T BOULEVARD �FWPORT BEACH, CALIFORNIA 92659_I 76$ ' SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR DRAFT ENVIRONMENTAL IMPACT REPORT/ ' ENVIRONMENTAL IMPACT STATEMENT ITECHNICAL REPORT NO. 5 BIOLOGICAL TECHNICAL STUDIES Biological Assessment Wildlife Crossing Technical Memorandum 3=20 Analysis of Avoidance Alternatives - Wetlands Impacts Spring 1990 Biological Survey Results C I I I I 1 L SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR BIOLOGICAL ASSESSMENT 1] .J 1 PREPARED BY LSA ASSOCIATES, INC. 1 PARK PLAZA, SUITE 500 IRVINE, CA 92114 (714) 553-0666 LSA PROJECT #TCA901A July, 16> 1990 L 1 J J I SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR BIOLOGICAL ASSESSMENT INTRODUCTION This technical report is a compilation of previous studies prepared by P&D Technologies in 1984, 1986, 1987 and 1988. In.additi-on, this report incor- porates the wetland analysis prepared by LSA using the United Federal Method (Appendix A) and field work conducted during spring 1990. SURVEY METHODS Prior to the field surveys, a literature search and records check was made for information on the biological resources of the Corridor. Documents researched included field studies conducted for various sections. of the Co,rri- ' dor, species descriptions and research literature. Aerial photography was used in designing the botanical surveys. In addition, previously prepared vegetation and sensitive species maps were used in the design of the field surveys and the preparation of this report. The Corridor was surveyed in 1983, 1986, 1987 and 1988 by P&D Technolo- gies. Vegetation surveys were conducted in late June and early July of 1983 of selected portions of the Area of Potential Effect (APE) from the vicinity of Bonita Canyon Reservoir south to Al i so Creek. Wildlife surveys included the entire length of the Corridor. Other special census surveys were conducted for sensitive amphibian, reptile, bird and mammal species. Survey methods included on -site field surveys by foot and by car, identi- fication of wildlife and inaccessible plant communities by binoculars and tele- scopes, use of scat, tracks, burrows, and similar sign to identify wildlife. A hair trap were used to identify mammals, as well as a photographic trap. ' Over 48 hours were spent on botanical surveys and over 95 hours were spent on wildlife surveys. The botanical surveys were conducted in late June and early July of 1983 in an attempt to locate spring flowering annual species. LSA conducted a spring field survey in 1990, searching for -sensitive spe- cies along the entire length of the Corridor. Approximately 89 hours over 21 days from May to July were spent conducting field surveys. The area surveyed by P&D included all habitats within 0.25 miles of the 1 Corridor centerline. The surveys by LSA were conducted within the line of disturbance defined by the limits of all related construction activity for the Corridor. To maintain consistency with the Environmental Management Agency (EMA) planning efforts, the vegetation and habitats identified are based- upon the EMA's Master Environmental Assessment (MEA) Program. Identification methods included field surveys in conjunction with intensive interpretation of avail. - able aerial photographs. Ci 1 The vegetation communities within the Corridor were mapped by P&D Tech- nologies in 1983, with updated reports in 1986, 1988 and 1990. These reports identify several plant communities as wetland types. The survey performed by LSA Associates during the week of March 5, 1990, used the vegetation informa- tion collected by P&D to identify candidate wetland locations. LSA used the routine on -site determination methodology described within the "Federal Manual for Identifying and Delineating Jurisdictional Wetlands," the Unified Federal Methodology, January 10, 1989. The plant communities are shown on Figures 1 through 5 (Conventional) and 6 through 10 (Demand Management). FINDINGS Plant Communities in the APE The vegetation along the San Joaquin Hills Transportation Corridor (Cor- ridor) is a complex mosaic of several plant communities influenced by numerous environmental factors such as topography, aspect (exposure to the sun), soil type, microclimate, available moisture, elevation, fire, and human influence (e.g., cattle grazing). Based on the EMA MEA Program, thirteen plant com- munities were identified by P&D in the APE. They are: • Grassland • Coastal Sage Scrub -Mixed • Mixed Chaparral • Oak Savannah • Oak Woodland • Riparian Woodland • Riverine • Forested Wetland • Scrub/Shrub Wetland • Saltwater Marsh • Emergent Persistent Marsh • Sand/Gravel Wash • Rock Outcrop • Cultural Disturbance • Plantation • Urban Cultural Altered Based on the USFWS wetland classifications system, there are five USFWS wetland types represented within the APE. • Riverine - Intermittent - Streambed • Palustrine - Forested Wetlands - Broad Leaved Deciduous • Palustrine - Scrub/shrub - Broad Leaved Deciduous • Estuarine - Intertidal - Emergent Wetland - Persistent • Palustrine - Emergent Wetland - Persistent The MEA equivalents are: Riparian Woodland/Riverine Forested Wetlands Scrub/Shrub Wetlands 1 L El I� 1 1 I 1 1 1 1 I� �1 �p 4, X tvr I; U7 J, 0 Illt RIL 0 0 C.) 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Q I CD( WLLJJ aZ x Z UJ W 2- c; _ FLU a� (3)� C). -C as a M t U oc a ca z 'O X m N Q V W a J O N .=- N N p (h d' In LU J oa cd r_ w 0) ol Sa io 4) cc U 9 0 3: o z .99,- N Z5, 8 E E In cr 0 < U w w ir ui 44 LU OD L2 A LU ui C0 cc > > IN ,CO CD 0) Si LU Z lu LV ui fir - , * . , - I 1 5 1 2-0 C*4 V- Lq La WJ 0 4" 0 0 0 75 M cc IL) CL Cl) 0 r cts C)) V U0 r m .0 ZZ CIJ V) CD 0) Z Cd cts .CO C-3cc co x .0 co Lv 0 cm to a tu > U) .0 ca 3 1xv, 0 ( 3 00cc m ol C4 C4 0) • Saltwater Marsh • Emergent Persistent Marsh The riverine system. is depicted on the vegetation map as having two separate communities. These two communities include basically an open channel with little or no vegetation versus the same system accompanied by -sycamore. This sycamore association is referred to as riparian woodland. The reason these, were divided is that there is no differentiation in the USFWS classifica- tion system between forested wetlands dominated by willows versus wetlands dominated by sycamore. In Southern California, these two plant communities are very different, require different mitigation techniques, and therefore require differentiation. Each natural plant community and open space areas are classified by the United States Department of Interior Fish and Wildlife Service (USFWS) as a particular Resource Category. Each Resource Category represents a category of plant community or habitat type of particular value. Moreover, the value of habitat type reflects upon the extent of mitigation that is required. The plant communities have been classified by Resource Category with a designated mitigation goal as shown below: Resource Criteria for Resource Category Category Designation Mitigation Planning Goal ' 1 Habitat is of high value for evaluation species and No loss of existing habitat value. unique and irreplaceable. 2 Habitat is of high value for No net loss of in -kind evaluation species and is habitat value. scarce or becoming scarce. ' 3 Habitat is of high to medium No net loss of habitat value for evaluation species value, while minimizing and is abundant. the loss of in -kind habitat value. 4 Habitat is of medium to low Mi-nimize loss of habitat value for evaluation species. value. There are no Resource Category 1 habitats in the vicinity of the Corri- dor. Resource Category 2 habitats -in the vicinity of the Corridor are: • Riparian woodland • Riparian forest • Saltwater marsh • Freshwater marsh. 13 L Resource Category 3 habitats in the vicinity of the Corridor are: • Coastal sage scrub -mixed ' • Mixed chaparral • Oak savannah • Oak woodland. Resource Category 4 habitats in the vicinity of the Corridor are: • Grassland • Rock outcrop • Cultural disturbance • Plantation. In the descriptions which follow, habitat types that do not occur within the line of disturbance for the Corridor are not discussed. Habitat types with similar characteristics, such as Cultural Disturbance, Plantation, and Urban/Cultural-Altered, were grouped into a single category for discussion. Upland Plant Communities Grassland. Adventitious grassland is prominent on many areas within the APE. This association is especially prevalent in Aliso Viejo, on the western reaches of The Irvine Company property and in Camarillo Canyon. This community consists of many kinds of introduced annual grasses, including brome grasses, common and slender wild oats and foxtail barley. Mustard, filaree, wild radish, fiddleneck, lupine and western ragweed are common. Native grasses include foxtail fescue, which is widespread throughout, and bunchgrass in the Sycamore Hills, the mid and south reaches of The Irvine Ranch and near the El Toro cliff area. There are also scattered areas of grasslands in the coastal sage scrub community. Some of these grasslands have formed in firebreaks, or are the result of brush removal for cattle grazing. Other areas are natural breaks in ' the coastal sage community where both native and introduced grasses are found. Coastal Sage Scrub - Mixed. The coastal sage scrub community is found throughout Southern California on low elevation hills and mountain slopes. It is found extensively in the San Joaquin Hills Section of the APE. The dominant plant species of the coastal sage scrub are aromatic, half woody shallow rooted shrubs, exhibiting drought tolerating strategies. Occupying the drier, rocky, or gravelly soils, the coastal sage scrub is an open shrub community that grows two to five feet in height. Little understory exists where coastal sage scrub is very dense. In more open areas, the understory consists of a variety of grassland species. However, true grasslands are more typically found on deeper soils, while coastal sage scrub occurs on thinner soils overlying bedrock. Representative coastal sage scrub species found in the APE include: California sagebrush, California buckwheat, black sage, bush mallow, coastal goldenbush, pine bush, bush monkeyflower, prickly pear, Indian paintbrush and deerweed. 14 1 1 Livestock grazing, in the Bommer Canyon area especially, 'has degraded the coastal sage scrub resulting in the introduction of large stands of prickly pear cactus and wild artichoke. Overgrazing has allowed these unpalatable plant species to gain a foothold and to outcompete other flora in their immediate vicinity. Laurel sumac occurs primarily in chaparral, 'but is found in the coastal sage scrub community in areas with deeper soils. The presence of laurel sumac (along with occasional 1emonadeberry) gives the coastal sage scrub a chaparral -like appearance. Rocky outcrop and areas of rocky steep slopes are common in the coastal sage scrub community of the APE. Several plant species are found primarily in these areas. Chalk live -forever was observed in several locales areas through- out the APE. Mixed Chaparral. Chaparral is composed mainly of evergreen sclerophyl- lous woody shrubs, which are fire adapted and drought tolerant. The leaves of the chaparral species are their most distinctive feature, being small, thick, stiff, and evergreen (Hanes, 1977). Fire is a significant environmental factor in chaparral. Chaparral is a "fire adapted" vegetation that has evolved over a very long period in response to climatic conditions (i.e., summer drought) and the recurrences of fire. Chaparral is dependent upon fire for optimum growth and health and has evolved physical characteristics that make these species highly flammable. Without fire, nutrients are not adequately recycled in the chaparral ecosystem. The soil -becomes sterile and chaparral plants eventually become decadent and die without replacement.' Nutrients are recycled from vegetative materials returned to the soil in the form of ash created by burning. The chaparral. present in the .APE is generally of a lower stature than normal chaparral. Most of the chaparral shrubs were four to six feet in height, with taller individuals in isolated areas and on the higher elevation north -facing slopes. Most of the chaparral in the APE is mixed chaparral. Mixed chaparral does not generally have any dominant species. Along the Corridor, chamise dominates the community in Upper Laurel Canyon, Upper Sycamore Canyon in the Sycamore Hills and along Laguna Canyon. Commonly observed .species in the APE chaparral habitat include: chamise laurel, sumac, lemonadeberry, poison oak, toyon and scrub oak: There were very few pure chamise stands (chamisalj in the APE. However, some limited chamisal was found just north of Upper Laurel Canyon along the north -facing slope separating it from Camarillo Canyon. rOak Woodland/Savannah. Oak woodlands are found along the ARE on canyon floors and on north -facing slopes along Upper Laurel Canyon, Upper Bommer Canyon, Upper Shady Canyon, Camarillo Canyon and E1 Toro Canyon. The oak woodlands require greater amounts .of available water than coastal sage scrub t and chaparral, and are therefore limited to areas of higher water availability such as found in canyon bottoms. Oak woodlands are also found in the APE on -the more sheltered, mesic, north -facing slopes. 1 15 F11 The dominant indicator species of oak woodland is coast live oak. Stands of this species range from dense closed canopied forest, such as in Upper Laurel Canyon, to very open stands such as those found along Upper Shady Can- yon. Oak savannah occurs where the oaks intergrade into the surrounding grass- lands. The understory of this plant community varies with the canopy density. Vegetative groundcover under dense oak forest canopy is very sparse to occa- sionally devoid of herbaceous species and shrub growth. The ground surface here is covered only with fallen leaf and twig litter. Areas devoid of vegeta- tive groundcover occur along Upper Laurel Canyon Creek. The majority of tree and large shrub species in these areas include coast live oak, scrub oak, toyon, and laurel sumac along the perimeter of the plant community. The perimeter species often form the arboreal members of mixed chaparral. Understory species include miner's lettuce, poison oak, wild cucum- ber, fiesta flower, and common eucalyptus. Rock Outcrop. Rock outcrops are plentiful within the APE. Rock outcrops are characterized by having thin gravelly soils that support unusual or limited distribution of plant species. Numerous cacti species occur within rock out- crops, as well as mariposa lilies, California plantain, California cottonweed, chalk lettuce, rock rose, Orange County Turkish rugging and many -stemmed dud- leya. Wetland Plant Communities Riparian Woodland/Forested Wetland/ScrubJShrub Wetland. Riparian wood- land occurs in isolated locations throughout the APE. It consists of trees and shrubs with an open to dense canopy. Generally associated with stream courses, this vegetation type occurs near areas where the groundwater table is very shallow on a year round basis. There are a few forms of this woodland community in the APE. There is a riparian scrub form (scrub/shrub wetland) which supports primarily non -arboreal and small arboreal plant species. There are riparian areas subject to periodic scouring by flood waters. In areas where the water table is high, plant spe- cies within this community include mulefat, mugwort, tree tobacco, arroyo, black and golden willow, and occasionally Mexican elderberry. This riparian plant community occurs in Bonita Canyon Reservoir, the unnamed drainage, Laguna Canyon, E1 Toro Canyon, Aliso Creek and Oso Creek. There are few locations within the APE which support riparian woodlands. In these areas, the riparian vegetation is visually dominated by sycamore, coast live oak, and Mexican elderberry. Willows, both in shrub and arboreal form, occur in and along the stream bottoms, along with coast goldenbush, mulefat and tree tobacco in isolated places. This riparian area occurs predom- inantly in Upper Laurel Canyon and in Sycamore Canyon. Riverine. True riverine habitat is limited along the Corridor. Riverine is characterized by an open channel containing no vegetation. Typically, Riverine habitat in Orange County is found along narrow channels that have 16 steep banks and_a narrow incised bottom. This type is found in parts of Bonita Creek, along the unnamed channel east of Coyote Canyon Road, Trabuco Creek and- Horno Creek. Freshwater Marshj(EmergentJPersistent March). Freshwater marsh acreage is very limited within the APE. Freshwater marshes occur in El -Toro Canyon, adjacent to El Toro Road along Laguna Canyon, Bonita Canyon Reservoir, and in the vicinity of San Diego Creek. Indicator species for the freshwater marsh include extensive stands of birch and field sedge. The fluctuating nature of surface water and groundwater levels influences the extent of the marsh habitat. During years of high rain- fall, the cattails and other marsh vegetation expand the boundaries of the marsh habitat. In years of low rainfall, marshes shrink- as surface water decreases. SandfGravel Wash. This linearly oriented habitat occurs in a small draw on the Aliso Viejo and along the center portion of Aliso Creek. These "areas are subjected to scouring during periods of heavy rainfall. Disturbed Sites Developed Areas. Within the APE, there is considerable acreage which has been altered for a variety of purposes. These designated developed areas correspond -to the County s MEA as cultural disturbance, plantation or urban cu-ltu;ral altered. The majority of -the Aliso Viejo is disturbed'by dry farming activities and extensive vegetative removal. Portions of the Corridor along Coyote Canyon are barren due to landfill activities and are classified as cultural disturbance. Cultural disturbance is also represented by the major paved roads within the APE. BIOTIC RESOURCES BY AREA San Diego Creek The wetland associated with San Diego Creek that is within the Corridor - is affected by tidal action and is dominated by mudflats typical o:f'tidal flats saltgr,ass (Distich7is spicata) along the drier fringes where tidal inundation does not occur regularly. This area was mapped as Emergent Persistent Marsh. The SCS mapped the soils of this area as Tidal Flats, a hydri c soil mapping unit. Above the north bank of the San Diego Creek to the west of the Corridor there is a small degraded wetland that is comminuted by tule (Scirpus califo- rnicus), cattails (Typha spp.), and giant reed (Arundo donax). Standing.water was observed in the area. Another wetland exists at the corner- of Jamboree Road and' MacArthur-. This wetland contains a small pond that is surrounded by tule, cattails, and willow. It appears that this may have been an old borrow pit or mi-ne that has revegetated naturally over the years. This area was mapped as Emergent Persis- tent Marsh and the surrounding wetland as Scrub/Shrub"Wetland. The SCS mapped 17 this area as a miscellaneous land type called Pits, a non-hydric mapping unit. On -site evaluations showed that the soils were in fact hydric and the area should be considered to be a wetland. Significant Wildlife Resources. The section of San Diego Creek crossed by the Corridor provides little wildlife value due to the limited amounts of natural habitats. Species expected to occur in this stretch of the Creek include black crowned night heron, mallard, great blue heron, western sandpiper and similar water dependent bird species. Bonita Canyon Reservoir and Vicinity Bonita Canyon Reservoir is located southwest of the intersection of Bonita Canyon Drive and Coyote Canyon Road approximately a quarter mile north of Spyglass Hill. The area surrounding the reservoir is dominated by disturbed grassland and islands of remnant coastal sage scrub. Botanical Resources. The bulk of the reservoir site contains riparian woodland consisting of three willow species, black (Salix goodingii), golden (S. laevigata) and arroyo (S. lasiolepsis). The wet meadow at the east end of the reservoir is vegetated by species adapted to alkaline conditions and halop- hyte species such as saltgrass, yerba mansa (Anemopsis californica), alkali rye (Elymus triticoides), alkali mallow (Sida leprosa) and alkali heath (Frankenia grandiflora). Areas which are somewhat less mineralized contain Olney's bul- rush (Scirpus olneyi), clustered field sedge (Carex praegracilis), creek net- tles (Urtica holosericea) and mulefat (Baccharis glutinosa). Moist disturbed transition zones located between marshy areas and the surrounding adventive grasslands contain weedy material such as bristly oxtongue (Picris echioides), bull thistle (Cirsium vulgare), common cockleburs (Xanthium strumarium), poison hemlock (Conium maculatum) and rabbitsfoot grass (Polypogon monspeliensis). The willow woodland grows on increasingly moist substrate as the lower western end of the reservoir is approached. The creek crossing through this woodland is bordered by Olney's bullrush, watergress (Echinochloa crusgalli), cattails, Mexican tea (Chenopodium ambrosioides), broad -leafed plaintain (Plan- tago major), celery (Apium graveolens), sugar beet (Beta vulgaris), nodding smartweed (Polypogon lapathifolium) and the beargrass species, (Polypogon semiverticillatus). Algae (Enteromorpha sp.) and watercress (Rorippa nastur- tium-aquaticum) are found in the Creek. The area of the reservoir adjacent to the dam has standing water and a freshwater marsh habitat. This setting is dominated by California bulrush thickets. Southern cattail (Typha domingensis) and common brass buttons (Cot- ula coronopifolia) are present. Within the wetter part of the willow woodland, tules are prominent in the understory. The most common of these is California bulrush (Scirpus califor- nicus). Also present are soft -stemmed bulrush (S. validus) and some alkali bulrush (S. robustus). Mexican rush (Juncus mexicanus), toad rush (J. bufo- nius), and umbrella sedge (Cyperus eragrostis) are also present. 18 In contrast to the woodland located at the western end of the reservoir, the drier woodland area to the east contains the following, species within or at the margin of its understory: poison oak (Toxicodendron diversilobum),' wild rose (Rosa californica), mugwort (Artemisia douglasiana) and California encelia (Encelia californica). The wet meadow and riparian -woodland habitats exhibit moderately good species diversity. A number of weedy species are present, due to the ongoing use of the adjacent area for grazing land. The variety of hydrophytes present (i.ncluding several salt marsh species) probably indicates that runoff into the reservoir is of relatively high alkalinity and that on -site evapotranspiration rather than downstream runoff account for most of the loss of water from the reservoir site. Rock Outcrop Habitats Northwest and Southwest of the Reservoir'. Rock outcrops around the reservoir provide sites for unique vegetation assemblages dominated by many -stemmed dudleya (Dudleya multicaulis). Several rock outcrops are present on the south side of Bonita Creek, at and below the dam crest. Others are located at the crests of knolls northwest of the Reservoir, within the, bounds of the University of California Ecological Preserve. Ecological Preserve rock outcrops are within the Corridor APE. The -outcrops are surround- ed by adventive and some native grasslands, and by coastal sage scrub contain- ing bladderpod (Isomeris arborea), California encelia, coastal prickly pear (Opuntia littoralis), and coastal cholla (0. prolifera), in addition to -typical components such as California sagebrush (Artemisia californica). The flora of the Ecological Preserve has been documented by U.C.I. Museum of Systematic Biology staff over several years (U.C.I. Ecological Pre- serve Plant Collection test, no date). Among the sensitive native grassland herbs are wildflowers such as purple mariposa-.(Calochortus splendens), golden stars (Bloomeria crocea), spring wild onion (Allium praecox) and blue-eyed grass (Sisyrinchium bellum). Cleveland shooting stars (Dodecatheon 0 evelan- dii), several borages (Cryptantha sp.), Plagiobothrys sp.) and (Pectocarya sp..), angelin gilia (Gilia angelensis), and gol-dfields (Lasthenia chrysostoma) are some grassland wildflowers present. Mesic (shaded north -facing slope) herbs recorded are bowlesia (Bowlesia i.ncana), miner's lettuce (Claytonia perfoliata), pellitory (Parietaria florida- na), and California hedge parsley (Caucalis microcarpa). Among the .outcrop species recorded from the reserve is Malpais.bluegrass ('Poa scabrella), a tufted perennial bunchgrass not common. in Orange County. i Significant Wildlife Resources. Bonita Canyon Reservoir provides water, cover and nesting sites for a variety of birds, reptiles, and amphibians. The habitat value of Bonita Canyon Reservoir is limited for mammals because the area is isol-ated from significant expanses of surrounding natural- cover. In addition, the lack of groundcover leading to the reservoir also' limits somewhat its suitability as a wildlife migration corridor. Tolerant .species such as coyote still use the reservoir 'as a water source. 11 19 Tall eucalyptus trees located near the east end of the reservoir provide nesting sites for red-tailed hawk. This habitat may also attract nesting red -shouldered hawk, black shouldered kite, and possibly Cooper's hawk. An estimated 90 species have been recorded during the surveys; of these, a minimum of 15 were confirmed as breeding species. In addition, at least 17 more species probably breed in the survey area and several other species may breed within or near the survey area. The Bonita Canyon riparian area accommodates a diverse assortment of migrant, wintering and resident bird species. The immature and mature golden and arroyo willows, mule fat, poison oak, rushes, tules, cattails and misc- ellaneous herbaceous vegetation and forbs provide the diversity, spatial heter- ogeneity and habitat complexity necessary for attracting a large number of bird species and individuals. Moreover, the adjacent grasslands and coastal sage scrub provide additional cover and feeding areas for a variety of birds. Willow flycatcher, yellow -breasted chat, yellow warbler, Swainson's thrush, warbling vireo, blue grosbeak, and northern harrier are all associated with riparian areas and protected marshes and were found within the survey area during the breeding season. All of these breeding species have declined in Southern California in recent years as a result of the elimination of suitable riparian habitats (Garrett, et al, 1981). The first three are species of special concern (Remsen 1978). The 1990 spring survey identified one or two pairs of yellow -breasted chat present at this reservoir. It is possible that all three species breed here. The northern harrier, a fourth species on the list of special concern, was observed foraging over the area on several occa- sions. The reservoir contains the necessary vegetation profiles which attract least Bell's vireo in other Southern California locales. The endangered least Bell's vireo was not found during the breeding seasons of 1985, 1987 and 1988, but was observed furing the 1990 spring survey. A single male was observed near the dam in the reservoir habitat. No nesting was observed however. Other sensitive species seen include black shouldered kite, grasshopper sparrow, tricolored blackbird, Cooper's hawk, willow flycatcher, cactus wren, yellow warbler, and southwestern pond. Unnamed Drainage The unnamed drainage is located an estimated 3,000 feet south of the intersection of Bonita Canyon Road and Culver Drive. It contains a narrow elongated pocket of riparian scrub and woodland. The surrounding area is dominated by disturbed grassland with some coastal sage scrub located in the vicinity. Botanical Resources. This narrow, steep -sided perennial stream flows northwest toward Bonita Canyon and contains riparian woodland habitat. Several large California sycamores (Platanus racemosa) are present in the drainage. Other species include arroyo willow, coast live oak (Quercus agrifolia) and large Mexican elderberry (Sambucus mexicana) present in the overstory. Within the understory a substantial amount of California blackberry (Rubus ursinus) is 20 11 located along the steep, shaded banks. Fringing the stream are -patches of yerba mansa and saltgrass, Olney's bulrush, iris -leaved rush (Juncus xiphtoi- des), grass poly (Lythrum hyssopifo)ia), rabbitsfoot grass, Mexican tea, common brass buttons, watergrass, celery, bristly ox-tongue..and" English plantain (Plantago lanceolata). Watercress and hornwort (Ceratophyl.lum demersum) were also identified growing in the water.. Flanking the watercourse and its riparian habitat are steep slopes covered with adventive,grassland and a very open stand of coastal sage scrub. Significant Wildlife Resources Observed. The vegetati-on in this area is not continuous but clumped. The habitat groupings are not large., neverthel-ess a number of raptor signs were seen in the -drainage-. A pair of great horned owls were seen on two successive days in the drainage. Also observed here was a large raptor nest, and an orange -throated whiptail lizard. Deer tracks were observed in this area. California gnatcatchers were sighted at the entrance of the drainage area, to the southeast. Although the area is not extensive enough or well enough developed to be considered a significant habitat area in the Corridor, the number of raptors observed was a notable occurrence. Upper Coyote Canyon Upper Coyote Canyon is located in the westerly portion of the -San Joaquin Hills and terminates just northwest of Signal Peak. Although only a small portion of the Canyon is located in the APE, the significant oak woodland and rock outcrops in this area occur within the APE. Botanical Resources. Unlike the downstream area now occupied by the sanitary 1-andfill, Upper Coyote Canyon exists in a natural state with good habitat resources. The south branch is botanically diverse and moderately sensitive. Within the APE are southern oak woodland sites on the north -facing slope near Signal Peak, and an extensive cover of mixed chaparral and coastal sage scrub elsewhere. The north branch contains mixed chaparral and some willow groupings along the streamcourse, flanked by grassland and coastal sage scrub. At the head of the southern branch is a sparse population of Orange County Turkish rugging (Chorizanthe staticoides chrysacantha). Native and adventive grasslands are also present at the head of the southern branch. Vegetation located within the chaparral and coastal sage scrub portions of the upper southern branch include toyon (Heteromeles arbutifolia), lemonade - berry (Rhus integrifolia), holly -leaved redberry (Rhamnus ilicifolia), prickly pears (probably all Opuntia, "occidentalis" complex), California sagebrush, California buckwheat, black sage, (Sal -via mellifera) and white sage (S., apiania). Many low growing, wide branched trees are located within the oak woodland on the slope north of Signal Peak. Much of the understory is open, with a deep It accumulation of humus duff. Where understory species are present, they consist of poison oak, common chickweed (Stellaria media), foxtail barley (Hordeum leporinum) and wood fern (Dryopteris arguta),. At the woodland margins and in openings are toyon, lemonadeberry, fuchsia flowering gooseberry (Ribes specios- 21 um), California fuchsia (Zauschneria californica) and California goldenrod (Solidago california). Significant Wildlife Resources Observed. No signs of raptor nests were identified in the area although previous surveys had listed Cooper's hawk as present in this area. Many turkey vultures were sighted flying overhead. Coyote sign was in abundance in Upper Coyote Canyon, which provides a good location for the predators of the area. Upper Bommer Canyon Upper Bommer Canyon is located just north of Signal Peak between Coyote and Shady Canyons. The northwestern watershed of Upper Bommer Canyon makes up this section. Botanical Resources. Bommer Canyon is approximately 5,000 feet wide and an estimated 10,000 feet long. Bommer Canyon is divided into two branches. The upper western branch and a small portion of the upper eastern branch are within the APE. The branch eastern of Bommer Canyon contains sycamore and live oak wood- land. Most of the woodland in this branch is outside of the APE. Coastal sage scrub and mixed chaparral are located on the eastern slope north of the live oak woodland, with grasslands located to the west and on the upper slopes of this branch. Outcrops were searched for plant species of concern but none were found. Plants that were recorded from the limited outcrop habitat were sandmat (Cardionema ramosissima), pygmy stonecrop (Crassula erecta), chalk lettuce (Dudleya pulverulenta), California plantain, pine goldenbush (Haplopappus pinifolius), Nuttalls's snapdragon (Antirrhinum nuttallianum), sapphire eriast- rum (Eriastrum sapphirinum), the Orange County endemic of Weed's mariposa (Calochortus weedii intermedius), bicolored cudweed (Gnaphalium bicolor) and prickly pear cacti. Within one of the large caves along this drainage were clusters of unusually large leaved California polypody (Polypodium californic- um) ferns. The western branch of Bommer Canyon contains a long outcrop exposure on its east side. On the north -facing slopes extensive live oak woodlands were identified. Large caves are on this shaded, mesic slope, partially hidden beneath the woodland canopy. Hydrophytes such as downy memetanthe (Mimulus pilosus) and yellow monkeyflower (Mimulus guttatus) were identified in the caves. The woodlands occur in broad bands interspersed with bands of mixed coastal sage scrub and chaparral. Typical understory species as wild cucumber (Marsh macrocarpus), poison oak and California polypody are present, along with toyon and other mixed chaparral species which are characteristic of oak wood- lands. Significant Wildlife Resources Observed. The Canyon contains several large caves, many of which are blocked with poison oak and prickly pear cactus. One of the caves contains a large cliff swallow nesting area. It appears this is the major breeding site for these birds in the area around Signal Hill. 22 1 H No raptor nests were observed in the oak trees i-n the Canyon. However, this area should be good for nesting birds of prey. Ample nesting opportuni- ties, grassland for foraging, and fairly remote location make Upper 'Bommer Canyon a potentially good area for raptors. A coyote was -seen near the Canyon on 'the east/west aligned ranch road system. Shady Canyon Upper Shady Canyon is relatively narrow with one major drainage occurring to the west. The Canyon is located approximately one mile southeast of Upper Bommer Canyon and aligned in a north/south alignment. Shady Canyon ultimately drains north into the Sand Canyon Reservoir area east of Turtle Rock. The Canyon contains an excellent scrub oak and live oak woodland on the north - facing slope. Botanical Resources. The west side of upper Shady Canyon is within the APE. The prominent vegetation on.this north- to east -facing slope is chapar- ral. Toyon, holly -leaved redberry and laurel sumac (Ma.losma laurina), sub- stantial amounts of scrub type oak hybrids are also present. These hybrids dominate a significant portion of the area, integrating with areas'of coast live oak woodland on the most mesic exposures. These oaks, like others in the San Joaquin Hills are hybrids of several oak tree and shrub species. Located on the western slope is a major headwater canyon. At the mouth of this canyon is an impoundment reservoir, which is a significant habitat from both a botanical and zoological standpoint. It is located at the margin.of the APE. Two submerged aquatic plant species, common water -nymph (Najas guadalu- pensis) and fennel -leaved pondweed (Potamogeton pectinatus) are located in the reservoir. Located along the shore is a band of emergent vegetation dominated by common spike rush (Eleocharis macrostachya) and knotgrass (Paspalum disti- chum). Within the emergent zone is some upright bur -head (Echinodorus ber- teroi). Lesser duckweed (Lemna minor) mats float on the water surface along the shore. Umbrella sedge, cattails and California bulrush are also present, the latter species especially common about the inlet into the reservoir. The earthen dam of the reservoir is overgrown with mulefat. Oak woodland and native grassland surround much of the reservoir. Along the south bank between the oaks and toyons and the -water edge is a dense stand of creeping snowberry (Symphoricarpos mollis). In the native grasslands flanking the reservoir, dominated by purple needlegrass (Stipa pulchra), are dense -flowered platycarpos (Lupinus densiflo- rus var. austrocollium) and woolly -leaved coastal goldenbush (Haplopappus venetus var. oxyphyllus). Between the native grasslands, oak woodl=ands and oak -dominated chaparral of the upper canyon floor and lower slopes, and the adventive grassland domi- nating the high ridge to, the west, are canyon slopes vegetated by mixed chapar- ral and coastal sage scrub. 1 23 Significant Wildlife Resources Observed. The majority of Shady Canyon is located outside the APE. Shady Canyon provides forage opportunities for wild- life in the area. The small reservoir in Shady Canyon had numerous clawed frogs and western toads. Some coyote, bobcat, and mule deer activity was apparent on the southeastern ridgeline. The southern Pacific rattlesnake and a coyote were seen in the canyon. Great horned owls were seen roosting in a rock cave in the canyon. There appears to be numerous areas suitable for nesting raptors. Upper Laurel Canyon Laurel Canyon comprises the APE as the Corridor approaches Laguna Canyon Road. Upper Laurel Canyon is approximately 10,000 feet from the Laguna Canyon Road right-of-way. This area represents the central portion of the Corridor. Botanical Resources. Laurel Canyon contains a good quality canyon floor live oak woodland with a few interspersed willows and sycamores. In its middle reach, this woodland is flanked by adventive grassland. Near the head of the canyon the grassland is replaced by dense thickets of coyote bush (Baccharis pilularis consanguinea). Laurel sumacs grow in dense stands along the upper north margin. The north -facing slope of Laurel Canyon contains a mosaic of grassland and mixed chaparral. The south -facing slope contains mostly coastal sage scrub. At the saddle between two promontory peaks on the ridge overlooking the north side of the canyon is a limited stand of chamise (Adenostoma fascicul- atum) chaparral (approximately one acre). In the lower portion of the water- shed, the band of live oak woodland is flanked by scrub and chaparral to the north and south respectively. The APE in Upper Laurel Canyon contains about 3,000 linear feet of oak woodland -savannah habitat in the canyon bottom, coastal sage scrub and laurel sumac thickets on the south -facing slope, and arborescent chaparral, oak wood- land and phreatophyte ferns and herbs on the north -facing slope and adjacent upper canyon. The bowl at the base of the canyonhead's north -facing slope contains a distinct population of western bracken fern (Pteridium aquilinum var. pube- scens), one of only two known in the San Joaquin Hills. Watson's bush lupine (Lupinus longifolius) and creek nettles also grow in the bowl. Dense thickets of poison oak are located in the periphery of the bowl, and at the bottom of the steep slope at the bowl's head. Substantial populations of many -stemmed dudleya are located on three separate outcrops (two next to each other and mapped as one occurrence unit) on the near vertical slopes west of the canyonhead bowl. Within the oak woodland downstream from the canyonhead bowl are golden - back (Pityrogramma triangularis), polypody and wood ferns, and a few maidenhair ferns (Adiantum jordani). Substantial amounts of poison oak were observed in the understory. Large toyon specimens and laurel sumacs were also found in the canyon bottom riparian area. Nuttall's bedstraw (Galium nuttallii), sticky 24 cingefoil (Potentilla glandulosa), California bee plant (Scrophularia calif- ornica), miner's lettuce and other mesic understory species were present. Downy memetanthe was growing in wet soil at the stream's edge. Significant Wildlife Resources Observed. This appears to be an important area in the Corridor. Due to the excellent ground cover, available water, rock outcrops, oak woodlands and numerous caves, the area is considered to be very good wildlife habitat. The canyon contains a stream with tadpoles and aquatic insects. It appears that the stream may be perennial and should be a very important source of water in the area. The site is a major area for raptor activity. Two barn owls and at least two raptor nests (species unknown) were seen in rock crevices. Cactus .wrens have been sighted in Upper Laurel Canyon. Ravens also nest in the area: Turkey vultures and immature red-tailed hawk use the area for foraging. Badger dens were recorded on -site. Camarillo Canyon Camarillo Canyon is a gently sloped canyon that opens up to Laguna Canyon Road. The APE is aligned along its north-fac tng.slope. After the APE.traver- ses southeast out of Upper Laurel Canyon, it crosses the_east-west running ridgelines down Camarillo Canyon and into the Sycamore Hills. Botanical Resources. The habitats in Camarillo Canyon include a broad area of mostly adventive grassland on the lower canyon floor, oak woodland along the seasonal stream channel in the upper canyon, a mosaic of oak groves and chaparral on the north -facing slope, prominent outcrops within a coastal sage scrub matrix on the south facing slope and a line of willows and a degrad- ed wet meadow area at the mouth along the Laguna Canyon drainage. The Canyon's most sensitive resources are oak woodlands. The north -facing slope habitat is composed of toyon, laurel sumac, lemon- adeberry and coyotebush, interspersed with live oak clusters and groves. The ridge between Camarillo and Laurel Canyons is comprised of coastal sage scrub, native grassland patches and laurel' sumac -thickets. The, live oak woodland on the upper canyon floor is flanked by adventi've grassland, creating a woodland -savannah setting. The dry understory beneath the trees is either unvegetated (in closed canopy areas), or covered with foxtail barley. Many of the live oaks are. very large,,with-widely spreading branches. Occasional openings in the woodland contain chaparral, and fuchsia- fl.owering gooseberry. The northern headwater lateral whose mouth is just t within the. APE con- sists of oak woodland with a chaparral- understory of holly -leaved redberry, lemonadeberry, toyon and laurel sumac. The area at the confluence of the north, and south laterals contains fine woodland habitat. The oak woodland thins out and deteriorates in habitat quality downstream from the confluence area. Significant Wildlife Resources Observed. Camarillo Canyon contains a mixture of wildlife habitat. Golden eagles have been observed roosting,in this 25 n area in the past. Resting sites for large predators were evident on many of the large rock outcroppings. Coyote and deer are present in the area, but the amount of activity of these animals is not high. A pair of nesting kestrels was also seen among the oaks at the base of the Canyon. This area provides a number of good habitats for vertebrates, but their densities are suspected to be low. The proximity to Laguna Canyon Road might be one reason for this apparent low activity. Laguna Canyon/The Irvine Company The Laguna Canyon/Irvine Company owned area is that part of Laguna Canyon on the west side of Laguna Canyon Road. Lower Camarillo Canyon is a part of the Laguna Canyon/Irvine Company owned area. This geographic unit is aligned in a north -south direction along Laguna Canyon Road. Botanical Resources. Significant botanical features on the west side of Laguna Canyon Road include a degraded wet meadow in the vicinity of the north edge of the APE, a narrow band of willow riparian woodland along Laguna Canyon Creek, live oak woodland at the south margin of Camarillo Canyon and in small Laguna Canyon lateral to the immediate south, and an extensive outcrop zone in lower portion of APE containing a large population of many -stemmed dudleya and a limited population of cotton fern (Notholaena newberryi), a coastal disjunct. A second many -stemmed dudl eya population is at the head of the small canyon south of Camarillo. Riparian Zones. The wet meadow occupies a large area just south of the Camarillo Canyon Ranch gate at Laguna Canyon Road. The margin of the wet meadow contains an abundance of common cocklebur, along with curly dock (Rumex crispus), rabbitsfoot grass, grass poly and common sunflower (Helianthus an- nuus). In more moist areas, wrinkled rush (Juncus rugulosus) and yellow monkey flower are encountered. The center of the wet meadow contained standing water during the 1983 survey. The meadow is dominated by common spike rush. In the alignment of the drainage along Laguna Canyon Road is a band of mulefat and willows. An arroyo willow riparian woodland extends southward from the Laguna Canyon -Sycamore Canyon confluence. It borders a narrow ditch containing flow- ing water and herbaceous riparian plants such as narrow -leaved cattail (Typha angustifolia), iris -leaved rush, watercress, creek nettles, yerba mansa, rigid hedge nettle (Stachys rigida), common cocklebur and lesser duckweed. There are a few coast live oak trees intermixed with the willows. to the South. Large live oak trees border the southern margin of Camarillo Canyon. Elderberries and toyon shrubs are distributed through the understory. A large cluster of sycamore trees are located in the small southern lateral. On the top surface of a large cliff above the sycamore trees are a series of rock exposures protruding through the soil cap. Each of these is i ringed with many -stemmed dudleya plants, along with mosses,, birdsfoot fern (Pellaea,mucronata), polypody fern and Bigelow spike moss (Selaginel7a bigelov- Laguna Canyon Outcrops. Numerous Topanga bedrock exposures are located along the west side, and to a lesser extent along the east side of Laguna Can= yon. The largest population of many -stemmed dudl-eya is found on the largest of these outcrops on the west side. An estimated 1000+ indivi-dual plants occur on this outcrop. Other prominent elements -of the outcrop are Bigelow spike moss, foxtail fescue, birdsfoot fern and coffee fern (Pel'laea andromediaefolia), prostrate spineflower (Chorizanthe procumbens), Nuttall's snapdragon, pine goldenbush, cactus species, rosinweed and pygmy stonecrop. Several 'clusters of cottonfern are located along a crevice extending across the outcrop. This locality is one of only two known for this uncommon Santa Ana Mountains fern in the San Joaquin Hills. Significant Wildlife Resources.Observed. Young western toads, tree frogs and several aquatic insects were found in a small stream along Laguna Canyon Road. Sycamore Hills .Sycamore Hills is the property located between Laguna Canyon Road and -El Toro Road. The APE transects Sycamore Hills about 3,500 feet north of the intersection of Laguna Canyon Road and El Toro Road. Botanical Resources. The APE spans the southern port ion of the Sycamore Hills. Vegetation in the area includes willow and sycamore riparian woodland, wet meadows and marshes, southern oak woodland, mixed and chamisal chaparral. Outcrop exposures and ridgetop cobble barrens are also found in the Hills. Coastal sage scrub and adventive grassland communities in Sycamore Canyon are the first and second most widely distributed communities in the area. Significant botanical resources within the Sycamore Hills- area include wet meadows, sycamore, willow and live oak woodlands and the locales of rare and endangered plant species. Most of the wet meadows south of Sycamore Canyon ' contain a variety of 'rushes, sedges and spike -rushes, alkaline marshy areas and clumps of willow trees. In the following descriptions of specific canyons within the Sycamore Hills APE, extracted from March, 1983 (Sycamore Hills Biological Resources Inventory, prepared for the City of Laguna Beach), certain letter -number codes are used to reference otherwise unnamed tributaries of Laguna and E1 Toro Canyons (for appropriate maps, please refer to subject report). Laguna Canyon tributaries are referenced as LC, and then numbers from 0 to 10 (from south to north-). Within the APE are canyons LC-1 through LC-5 (Sycamore Canyon) and the mouth of LC-6. E1 Toro Canyon tributaries are referenced as ET, with numbers from 1 to 7. Within the APE are canyons ET-2 through ET-5. The Corridor alignment presently depicted would pass between LC-3 and 4, cross the ridge and exit through ET-2, crossing the toe of the ridge between ET-2 and ET-3. 1 27 Botanical Resources Within Laguna Canyon Tributaries. The east side of Laguna Canyon within area LC-1 contains incised drainages to the south, within a fairly well defined small canyon is located to the north. The hillsides of the canyon contain coastal sage scrub and woody brush, consisting mostly of laurel sumac and Mexican elderberry along the valley margin. A large rock outcrop extends to the valley floor just south of the canyon. The canyon supports a very substantial population of many -stemmed dudleya. Rock outcrops are located at the head of the draw and on the ridge nose separating LC-1 from LC-2. Also at the head of LC-1 on the north -facing slope is a stand of coast live oaks, with miner's lettuce, wood ferns, wild cucumber vines and orange bush monkeyflower (Mimulus aurantiacus) beneath. Here, a unique non -flowering plant of the hornwort (primitive liverwort) group, was found. LC-2 contains live oak woodland on the lower north -facing slope. The remainder of the canyon vegetation consists of adventive grassland on the canyon floor, chaparral (mostly laurel sumac), coastal sage scrub and cactus on the slopes and poison oak thickets in the upper draw, extending to the ridge. LC-3 has a seep zone on the canyon head rock face and a sandstone barrens surrounded by a chamise stand on the ridge divide with LC-4. A small wet meadow occurs at the mouth of the canyon. A seep zone is located at the top of the canyon head sandstone outcrop. Mesa saxifrage (Jepsonia parryi), golden - back fern and blue eyed grass grow in this area. At the base of the outcrop, a small population of waterwort (Elatine sp.) plants exist. This was the first find of the genus and family (Elatinaceae) in Orange County. Elatines are inconspicuous herbs which characteristically occur on the muddy shores of ponds, slow moving streams and vernal pools. The divide ridge north of LC-3 is composed of decomposed sandstone. Most of the ridge top is covered with chamise shrubs. On the north side of the slope extending down into LC-4 is a mosaic of coastal sage scrub and isolated grassland patches containing substantial amounts of native annual and perennial grass species and wildflowers such as golden chaetopappa (Chaetopappa aurea). The bottom of LC-4 is occupied by adventive grassland. The upper end of the canyon contains a mosaic of sumac chaparral and coastal sage scrub. A rocky outcrop occurs on the back slope. The south -facing slope contains an open stand of coastal sage scrub, interspersed with grassland, and substantial amounts of coastal cholla and prickly pear cacti, particularly near the western end. Outcrops scattered across the slope are flanked by pine goldenbushes. A grove of Mexican elderberry bushes is located near the mouth of the canyon, above the floor of Laguna Canyon proper. A single coast live oak tree is located at the toe of the north ridge divide. Beyond is the sycamore stand at the confluence of Sycamore Canyon and Laguna Canyon. Sycamore Canyon is the most extensive drainage system within the Sycamore Hills. The canyon extends about 5,000 feet northeastward into the hills from its Laguna Canyon confluence. There is a well defined stream channel that disappears near the canyon mouth. This channel contained flowing water during the April 1983, inspection period. 28 J. 1 1 I 1 f] 1 1 r A number of drainage laterals enter the canyon from the northwest and southeast. The southeast -laterals are generally longer in length (+ 800 feet) than the cross canyon northwest laterals (+ 400 feet), except near the canyon head. The canyon terminates at a two (2)'branched headwater. Only two later- als, an il,l-defined one from the north (SCN-0) and a well defined multi- branched one from the south, are within the APE. The lower parts of the main canyon and the floors of some of the laterals contain an adventive grassland cover of bromes, fescues.and wild oats. Near the grassland/scrub margin and in isolated patches within the scrub is purple needlegrass. Wildflowers include the annual blue -flowered wild heliotrope (Phacelia distans), smooth cat's ear (Hypochoeris glabra),.broad- lobed filaree (Erodium botrys), fiddleneck (Amsinckia intermedia), white forgetmenot (Crypta= ntha intermedia), rusty popcorn flower (Plagiobothrys nothofulvus), southern suncups (Camissonia bistorta), toadflax (Lineria canadensis var. texana), Lindley's annual lupine (Lupinus bicolor) and owl's clover (Orthocarpus purpur- ascens) The grasslands near the, scrub -margin on the upper valley slopes are composed predominantly of low growing fescue and soft chess-. Scattered across the valley- floor grassland are groves and clusters of California sycamores and coast live oaks. The naturally occurring woodlands have been supplemented with new sycamore plantings; these plantings do not appear to be the native California sycamore, however. There are two principal sycamore stands, only one of which is within the APE. At the mouth is a grove of about 19 mature trees plus numerous saplings. . Coast live oaks are found in the main canyon and in some of the southeast laterals. Two fairly large groves are found in the upper canyon above the sycamore woodlands beyond the APE. The southeast facing slope of Sycamore Canyon presents the typically xeric aspect of such exposures throughout the Sycamore Hills.. The vegetative cover is composed of coastal sage scrub shrubs (mostly black sage), western and coastal prickly pears, coastal cholla and scattered laurel sumacs and lemonade - berry shrubs. SCN-0, the lateral on the north side, near the.canyon mouth is poorly defined. It is separated from SCN-1 by a lateral divide containing ridgetop cobblestone barren exposures vegetated by crested stipa (Stipa coronata), cacti, chalk lettuce, lance -leaved dudleya (Dudleya lanceo'lata), bicolored cudweed and goldentop grass (Lamarckia aurea). SC-1, at 1,300 feet in length, is the longest and largest of the north- west facing slope laterals. The lower floor is broad, level and occupied by adventive 'grassland. The head is bifurcated into four branches. A low ridge separates SC-1 from a minor drainageway immediately up the canyon. This latter landform burned about four years before the survey and contained deerweed (Lotus scoparius), bush encelia and other post -fire succession coastal sage scrub shrubs when inspected. Chaparral and some coast live oak trees vegetate the north -facing slopes in SC-1. Scrub oak, holly -leaved redberry, lemonadeberry, toyon, and chami-se 29 constitute the north -facing slope chaparral cover. The mesic nature of the setting is reflected in a variety of understory plant species. Between Sycamore Canyon and LC-6 is a minor canyon. The canyon floor contains numerous deer trails. Dead and living coastal sage scrub specimens mixed with star -thistle are found on the canyon bottom. Several Mexican elder- berry bushes and giant rye clusters grow on the upper floor. The slopes of this canyon are covered by coastal sage scrub cover. At the back of the canyon is a small outcrop. The south -facing slope contains a large amount of cactus within the dominant coast sage scrub toward the mouth. A prominent series of outcrops occurs on this south -facing slope. Above the upper margin of this area is an abundance of prostrate spineflower and rosin weed (Calycadenia tenella). At the margin and within soil pockets on the outcrop is a stand of Orange County Turkish rugging. The area across which the clusters of Turkish rugging are scattered measures approximately 20x40 feet. At the extreme western end of the outcrop grows many -stemmed dudleya. Ridgeline. The ridgeline of the Sycamore Hills northward is arid and well drained, and vegetated by xeric habitat plant species and coastal sage scrub. The north side of Sycamore Canyon contains silverback ferns (Pityrogramma triangularis viscosa) and a single lace fern (Cheiianthes californica) plant. This is only one of four known localities for lace fern in the San Joaquin Hills. South of the heads of ET-3 and SC-1, the coastal sage scrub habitat becomes quite dense. In some canyonhead areas woody brush, particularly laurel sumac, extends to the ridgeline. South of ET-2 is an extensive thicket of cardoon (Cynara cardunculus). The vegetation in this area gradually becomes a mosaic of coastal sage scrub and grassland. Finally, toward the point, plant community is dominated by black mustard (Brassica nigra). The proposed cross- over point for the Corridor is within a transition area between the xeric coastal sage scrub in the northern hills and the weedy grasslands of the south- ern hills. E1 Toro Canyon Tributaries. ET-2 contains a broad south oriented valley dominated by adventive grassland. The slope to the west contains visually prominent sandstone outcrops. The floor of ET-2 is vegetated by annual grass- es, principally ripgut brome (Bromus diandrus). A small drainage channel passing south through the valley is fringed with Mexican elderberry and at E1 Toro Road with black willow and mugwort. The slope east of the valley is vegetated with black sage, along with lemonadeberry, laurel sumac, prickly pear and coastal cholla. Two populations of many -stemmed dudleya grow on the ridgetop just north of the point where the ridge bifurcates into an east and west branch near El Toro Road. The narrow headwater area contains toyon, lemonadeberry, laurel sumac, Mexican elderberry and some scrub hybrid oaks. 30 The west slope of ET-2 dips broadly and gently eastward from the Sycamore Hills backbone ridge. Above the prominent outcrops, the veget_ati-ve cover is a mosaic of coastal sage scrub and small grassland patches. Surrounding the outcrops are dense cactus patches. The drainage arroyo below is filled with lemonadeberry and other chaparral brush. The grassland. islands, scattered across the upper slope contain both native annual and perennial elements, as well as non-native grass species. Purple needlegrass, foxtail fescue (Festuca megalura) and soft chess (Beomus mollis) are principal species present. ET-2 lies within the proposed right-of-way for the San Joaquin Hills Transportation Corridor. The populations of many -stemmed dudleya lie beyond the depicted grading line for the Corridor. ET-3, ET-4 and ET-5, within the APE, are a series of 400-500 foot long, elongated "u" shaped canyons, which drain runoff from the backbone ridge of the Sycamore Hills southeastward to the E1 Toro Canyon stream channel east of El Toro Road. In general, the canyons contain grassy floors, reflecting- past agricul- tural use, coastal sage scrub vegetated southwest facing slopes and northeast facing slopes containing some chaparral and one stand of oak woodland. ET-3 is perhaps the least significant of the E1 Toro Canyon tributaries. However, as noted in the previous section, between ET-2 and ET-3 on the ridge - top there is a population of many -stemmed dudleya. In addition;. there is a cluster of coast live oak trees midway up the north -facing slope. - The most significant resource of ET-4 is an oak woodland which occupies the front one-third of a north -facing sl-ope. Associated with the woodland are understory shrubs, herbs and ferns. The canyon floor is vegetated with grass- land toward the mouth. This is replaced by a cover of California sagebrush in the interior. ET-4, as viewed from above, exhibits evidence of a recent burn near the main ridgeline. Wildflowers are present in the ephemeral post -burn associa- tion, some of which are species not common elsewhere -in. Orange County. This particular burn area -exhibited the most diverse wildflower display seen on such sites in the Sycamore Hills. The burn site also contained clumps of crested stipa and beard grass (Bothriochloa barbinodis). ET-5 contains only minor amounts of significant biological resources. A small coast live oak cluster (or a single tree) is located on the north -facing slope at the mouth, while near the head on the exposure is a stand of scrub oak. Prominent sandstone outcrop: exposures are visible at the back wal-1. These outcrops wrap around onto the upper south facing slope. Significant Wildlife Resources Observed. The Sycamore Hills site has been reported to have a high animal density. The area serves as a link between Irvine owned property to the west and Mission Viejo owned property to the east. To the north are the Laguna Lakes. Large number of sycamore trees provide a 31 1 habitat for flycatchers, woodpeckers and wrens. Cactus wrens were widespread in suitable habitat in the hills. The area also has been reported to contain numerous signs of deer. The E1 Toro Canyon Tributary area serves as an important crossing area for the large mammals of the region. Deer follow the bottom of canyons in this area. Most of the deer activity seen was in the northern portion of the prop- erty, close to the lakes. Tracks of raccoon, bobcat sign and road kills of skunk and opossum have been reported from the area. E1 Toro Canyon E1 Toro Canyon and the E1 Toro Cliffs represent the area immediately to the east of E1 Toro Road. This area is part of the Aliso Viejo and is owned by the Mission Viejo Company. Botanical Resources. Four habitat types occur in and at the eastern margin of E1 Toro Canyon within Aliso Viejo. They are riparian woodland, freshwater marsh and swale habitats along the drainage course in the canyon, plowed dry farm areas on the canyon floor east of the drainage course, live oak and hybrid "scrub" oak woodlands, mixed chaparral and coastal sage scrub habi- tats found on the sides of the canyon, and on the ridgetop, cobblestone areas containing populations of two Orange County endemic plant species occur. Significant Wildlife. Resources are described in the following sections. E1 Toro Creek. The most botanically significant areas of E1 Toro Creek are found in the northern half of the APE and in the area between the north edge of the APE and a point immediately east of the south edge of Leisure World. In this area are extensive willow woodlands interspersed with wet mead- ows, marshes and swales. The riparian woodlands are dominated by arroyo willows, with mulefat along margin areas. The most dense woodland areas contain black and golden willows, in addition to arroyo willows. Within the wet meadow/marsh habitats are large patches of yerba mansa, iris -leaved rush, clustered field sedge, alkali wild rice, common spike rush and wire rush (Juncus balticus). Standing water areas contain cattails. Downstream in the southern half of the APE, the undefined drainage system of wet meadows, marshy areas and wet woodlands are replaced by a visible stream course bordered by a broken to continuous line of willow trees. The east slopes of E1 Toro Canyon in the APE are dissected by three drainage laterals, the southern of which is two -branched. Healthy live oak woodland grows along the canyon south of the APE and in dispersed groves on north and northwest exposures within the APE. Sizeable groves are located on the north -facing slope of the southernmost lateral. At the ridgeline overlooking E1 Toro Canyon above the central of its three APE zone tributaries is an exposure containing an extensive population of 32 many -stemmed dudleya. On the east facing slope of' this ridge (facing extreme Upper Wood Canyon) is a fairly limited population of Orange County Turkish rugging. Intermediate Weed's mariposa lily, San Diego-bent'grass (Agrostis diegoensis), june grass (Koeleria micrantha), foothill and purple needlegrass- es, rosinweed and California buckwheat and dwarfed specimens of other coastal sage scrub components also occur here. URper,Wood Canyon, Moulton Peak Ridgeline Burn Wood Canyon runs north to southeast of E1 Toro Road. It lies between the Aliso Viejo Planned Community and Laguna'Canyon. Moulton Peak Ridgeline is located 4,500 feet southeast of El Road. The Wood Canyon/Moulton Peak area represents the last major natural area in the APE. Southwest of the area is the rapidly developing Al'iso Viejo area. Significant Wildlife Resources Observed. The field along El Toro Road has been plowed under between the field and the road. The willow area contains large numbers of blue grosbeaks, an uncommon bird in this area. Also observed were a red-tailed hawk nest with a young animal, and one individual of the San Diego horned lizard. Signs of rattlesnake (scat) and coyote were also seen. This habitat is an important source of cover and water for many predators. Botanical Resources. Wood Canyon. Wood Canyon does not contain significant botanical resourc- es in the APE,. The oak and sycamore forest and freshwater marsh habitats in Wood Canyon occur in the downstream portions of this watershed outside the APE. In the south portion of the APE, the main stem of Wood Canyon contains willow woodland. The canyon drainage is open and grassy above. A small tributary of the canyon., lying within the area of direct impact from the Corridor, contains a sycamore, willow and Mexican elderberry woodland, with an understory of poison hemlock, creek nettles, small -flowered nightshade (Solanum nodiflorum) and branching phacelia (Phacelia ramosissima). A seasonal stream is located in this tributary. Spike rushes, cocklebur, rabbitsfoot grass, grass poly, willow dock (Rumex saliufolius),, cotton -batting plant (Gna- phalium chilense), western verbena (Verbena lasiostachys) and other phreato- phytes and hydrophytes edge the stream. Moulton Peak Ridgeline Burn. The .northern part of the main Aliso Viejo Ridgeline lies within the Corridor APE-. The most significant resources of the Moulton Peak ridgeline are the populations of Orange County Turkish rugging, two of which exceed two acres in extent. This is the most important Orange County Turkish rugging population anywhere in the APE. (The largest popula- tion has been included in the Aliso Viejo open space [Watson, 1983].) Significant Wildlife Resources Observed. Wood Canyon. It is apparent there is considerable use by large mammals in Wood Canyon. The scat analysis of coyote revealed a varied diet. Signs of deer were present. California gnatcatcher was seen in the -coastal sage scrub. 33 1 n Other species observed included the black -shouldered kite, ash throated fly- catcher, hooded oriole, loggerhead shrike, mockingbird, California quail, cactus wren, roadrunner, American crow and phainopepla. Moulton Peak Ridgeline Burn. This burned community was investigated for vertebrate species. Although deer scat were not particularly abundant, the area has or will provide good deer browse in winter and spring months. Invad- ing grass species and young or resprouting shrub material should provide ample food for deer in the area. The Moulton Peak Ridgeline burn has created considerable habitat for insectivorous birds in the APE. Due to the presence of the insectivorous birds and the number of insects (i.e., bees, wasp, ants, caterpillars, moths, spi- ders, grasshoppers, etc.), it is apparently excellent habitat for the phainopepla, ash throated flycatcher, loggerhead shrike and cactus wren. All of these avian species were observed, including hooded oriole, mockingbird, northern harrier, roadrunner, California quail, black -shouldered kite, turkey vulture and American crow. Aliso Creek I Aliso Creek is located in the southern quarter of the APE. The creek is surrounded by cultivated barley and disturbed grassland. Aliso Creek, at the juncture of the APE, is located just 3,500 feet northwest of La Paz Road. Botanical Resources. A riparian habitat exists within the APE as the Corridor crosses Aliso Creek. This habitat is around the confluence area of the creek and a tributary which drains southeast of the northern end of Moulton Ridge. Within the actual Corridor cross section, the band of riparian vegeta- tion is fairly narrow. This condition continues upstream where, in many areas, pastureland extends to the bank margin overlooking the creek. Aliso Creek is a perennial stream increasingly augmented by irrigation runoff as its upstream watershed in the E1 Toro -Laguna Hills area is developed. ' The resultant hydrophytic vegetation along the lower reaches of the creek is quite lush. Extensive willow woodlands and a variety of emergents and moist edge plant species occupy the drainage course bank. Golden willow, black willow, arroyo willow, mulefat, Mexican elderberry and giant reed are all present in the woodland areas. A band of Olney's bulrush is found along much of the creek. Among other species encountered are mugwort, celery, Mexican rush, nodding smartweed, toad rush, knotgrass, narrow -leaved cattail, slender creeping spikerush (Eleocharis montevidensis), common brass buttons, alkali heliotrope (Heliotropium curassavicum), yerba mansa, tree tobacco (Nicotiana glauca) and castor bean (Ricinus communis). Significant Wildlife Resources Observed. Although the riparian vegeta- tion contained a number of species, the overall density of animal populations was low. One reason for low densities is the narrow width of this habitat and its isolation from native habitats. Species observed includes red -winged blackbird, meadowlark, killdeer, American goldfinch, black phoebe, hooded ori- 34 1 ole, mockingbird, American kestrel, vulture, cliff swallows, brown towhee, and ground squirrel. Coyote, fox, and Oso Creek - house finch, red-tailed hawk, turkey western fence lizard, common kingsnake skunk track were also observed. rBotanical Resources, Oso Creek represents the most southerly located biological resource contained within the APE. Degradation over the years and proximity to the San Diego Freeway has severely limited its natural value. Most of the upper reach of the creek today is channelized as it passes through a commercial area. Much of the area below contains at least some kind of bank stabilization, such as dump riprap. The stream is severely downcut as it approaches the Arroyo Trabuco confluence; the sheer vertical banks periodi- cally slough off into the stream below. There is well developed riparian willow, sycamore, giant reed and mulefat vegetation along this lower reach. Significant Wildlife Resources Observed. Within the northern limits of the APE, portions of the creek that have not been cleared support a lush growth of mulefat .and arroyo willow. Long -billed marsh wrens have been observed in the cattails. A yellow -breasted chat has been observed in brushy vegetation at the Crean-Bathgate Ranch boundary. The area is quite noisy because of adjacent traffic on Camino Capistrano and the San Diego -Freeway which acts to restrict identification of individual birds by the birds of the same species. Species of many marshland birds have been observed over the last several years, including concentrations of red -winged and Brewer's blackbirds, cinnamon teal and common snipe, song sparrows, white -crowned sparrows, house finch, black -shouldered kite, a male marsh hawk, several red-tailed hawk, a kestre-1, logger -head shrike, Anna's hummingbird and green heron. SENSITIVE ELEMENTS Agency Regulations Federal Categories. There are five categories of federal listings in the threatened or endangered category (USFWS, 1989). Species in all five catego- ries are considered significant. 1) Listed Endangered; 2) Listed Threatened; 3), Proposed as Endangered; 4) Proposed as Threatened•, and 5) Category 1 Candidate for Listing. There are two other federal categories that do not constitute a de facto classification of a species as significant. For the Category 2 Candidate category, the USFWS has found that there is not enough information to reliably determine the status of these species. However, available information may support a finding that the species should be classified as threatened or endan- gered. Category 3 includes species previously considered to be candidates for 35 11 listing as threatened or endangered, but which are being dropped from further consideration. State Categories. There are four categories of State listings which place species in the rare/threatened/endangered category: 1) Endangered; 2) Threatened; 3) Rate and 4) Candidate for Threatened or Endangered. The fourth ' category is equivalent to Category 1 Candidate for listing in the federal system. In practice, these species should be considered as endangered or threatened. Additionally, the CDFG lists Species of Special Concern (CSC). For , mammals and birds, these CSC species are divided into three priority groups. Species in the "highest priority" group face imminent extinction or extirpation from California, and therefore are usually considered very sensitive. Species in the "second priority" group are declining in a significant part of their range within the State; however, the threat of extinction or extirpation is less imminent. those in the "third priority" group do not face any immediate threat but they are declining and may be vulnerable. California Native Plant Society Categories. The California Native Plant Society (CNPS) has four basic categories of listed plants: 1) plants of the highest priority, which are divided into subcategories of plants that are presumed extinct in California and plants that are rare or endangered in Cali- fornia and elsewhere (List la); 2) plants which are rare or endangered in California but more common elsewhere (List lb); 3) plants about which more information is needed (List 2); and 4) a "watch list" of plants of limited distribution (List 3). Species on List lb would meet the criteria for a rare, threatened or endangered species under CEQA Section 15380. Species on List 2 may meet CEQA qualifications, but there is insufficient evidence to support this finding. Species on List 3 do not meet the CEQA Section 15380 qualifica- tions. Plant Species Species of plants representing P concern special b USFWS include listed Y and candidate species for listing (Table 1). The latest plant list issued to the County of Orange was for January 6, 1987, and reconfirmed by telephone between Sylvia Wells -Vega of Caltrans and Jack Fancher of USFWS (March 15, 1990). Only those species observed along the Corridor are described below. Many -stemmed dudleya. Many -stemmed dudleya is a Federal Category 2 Candidate Species for threatened/endangered listing. It is listed by the CNPS on List lb. Many -stemmed dudleya occurs, or historical) occurred in Los Angeles ' Y � 9 County, western San Bernardino and Riverside County, Orange County and the extreme northwestern portion of San Diego County. Range extensions have been documented by Benner et al, 1981 (Fremont Canyon -Irvine Lake area, and Estelle Mountain in Riverside County); by Marsh et al, 1989 (Santiago Oaks Regional Park in Santiago Canyon); and by the Museum of Systematic Biology, U.C. Irvine, no date (University of California, Irvine campus area). 36 1 TABLE 1- _POTEMTI_ALSENSITIVE SPECIES Within Corridor Area of Effect Species Type of Listing Not Sighted Sighted/Location PLANTS Brauriton's milk -vetch CNPS18, C2 X Astragalus brauntonii San Fernando Valley chorizanthe CNPS1A, Cl X Chorizoanthe parryi fernandina Los Angeles sunflower CNPSIA, Cl, X Helianthus nuttalii parishii Aphanisma CNPS3, C2 X Aphanisma btitoides Prickly poppy CNPSIB, C2 X Argemone munita robusta Dense reed grass CNPS4, C2 X Calamagrostis dense Orange County Turkish Rugging CNPS1B, C2 X Aliso Viejo, Sycamore Chorizanthe staticoides chrysacantha Hills, Coyote.Canyon Laguna Beach Dudleya ST, CNPS18, Cl X Dudleya stolonifera Many -stemmed Dudteya CNPS18, C2 X Bonita Canyon Reservoir; Dudleya multicaulis Laurel Canyon, Laguna Canyon; Aliso Viejo, Sand -Canyon Road Viscid dudleya CNPS18, Cl X Dudle a viscida Heart leaved pitcher sage CNPS18, C2 X Lepechinia cardiophylla San Diego button bush CNPS18, C2 X Tet0acoccus dioicus Ashy (Mesa) Clubmoss CNPS4 X Selaginetla cinerascens INVERTEBRATES Monarch None X Sand Canyon Avenue Danaus ptexippus REPTILES AND AMPHIBIANS Arroyo toad C2 X Bufo microscaphus californicus California red -legged frog C2 X Rana aurora dravtoni Southwestern (Pacific) Pond Turtle CSC, C2 X Bonita'Creek Clemmys marmorsta Pattida San Diego Horned•Lizard CSC, C2 X Eastside of El Toro Road Phrynosoma coronatum blainvillei and Moro Canyon 1 Orange -throated Whiptail CSC, C2 X Sycamore Hilts Cnemidophorus hyperythrus BIRDS Burrowing Owt CSC2 X Athena cunicutaria California (black -tailed) Gnatcatcher CSC2, C2 X'Bonita Canyon Reservoir Potioptida (metanura) californica and Aliso Viejo Central Cactus Wren None Ridge X Upper Lauret, Bonita Campylorhynchus brunneicapillus Canyons and Aliso Viejo Least Bett'S Vireo SE, FE X Vireo beLtii Pusillus Yellow Warbler CSC2 X Bonita Canyon Dendroica petechia Yellow -breasted Chat CSC2 X Bonita Canyon Icteria virens Grasshopper Sparrow NAS X Bonita Canyon Reservoir Ammodramus savannarum Tricolored Blackbird C2 X 1988 X 1985 Survey A9elaius tricolor 37 TABLE 1 - POTENTIAL SENSITIVE SPECIES (Continued) Within Corridor Area of Effect Species Type of Listing Not Sighted Sighted/Location PLANTS Golden Eagle CSC3, CFP X-No nesting X Observed in flight Aquila chryssetos observed Red -shouldered Hawk CSC X-No nesting X Observed in flight Buteo lineatus observed Ferruginous hawk C2 X Buteo re9alis Swainson's hawk C2 X Buteo swainsoni Barn Owl None X-No nesting X Observed in flight Tvto alba observed Great Horned Owl None X-No nesting X Observed in flight Bubo vir9inianus observed Screech Owl None X-No nesting X Observed in flight otus kennicottii observed Coopers Hawk CSC3 X-No nesting X Observed in flight Accipiter cooperi observed Black -shouldered Kite CFP X Grassland habitat Elanus caeruleus Spotted bat C2 X Eudurma maculatum Greater mastiff bat C2 X Eumops perotis californicus Pacific pocket mouse C2 X Perognathus longinimbus pacificus Key CNPSIA - California Native Plant Society list of plants which are presumed extinct. Considered significant under CEQA if the species is rediscovered CNPS1B - California Native Plant Society list of plants which are rare or endangered in California and elsewhere - may be considered significant under CEQA CNPS3 - California Native Plant Society list of plants about which more information is needed CNPS4 - California Native Plant Society watch list of plants of limited distribution whose status should be monitored regularly - not significant under CEQA C1 - Federal Candidate for listing for which enough data exists to support listing - considered significant under CEQA C2 - Federal Candidate for listing for which insufficient data exists to support listing - may be considered significant under CEQA CSC - California Species of Special Concern - may be considered significant under CEQA CSC2 - California Species of Special Concern priority 2 - may be considered significant under CEQA CFP - California Fully Protected - may be considered significant under CEQA ST - State listed as threatened - considered significant under CEQA SE - State listed as endangered - considered significant under CEQA FE - Federally listed as endangered - considered significant under CEQA NAS - National Audubon Society Blue List (Noted only where there are no other listings) - may be considered significant under CEQA depending on local status 38 1 �i 1 1 P_� I 1 During the 1990 spring survey, the four known populations of this species along the Corridor route were visited. The smaller patch southwest of the Laguna Canyon Road crossing was noted, as were the patches southwest of the Bonita Canyon Reservoir dam. The separate patches on two knolls northeast of the Bonita Canyon Reservoir dam were not relocated. New populations were found in seven general areas. About 20 plants were approximately 1,000 feet west of the Laguna Canyon Road crossing, on a hillside overlooking the canyon. About 15 plants were approximately one mile east of the Sand Canyon Avenue crossing. The largest population found included five groups totaling about 300 plants immediately north of station 9905, approximately 2,700 feet east of the Sand Canyon Avenue crossing. Two groups totaling about 15 plants were found approximately 500 feet east of the Sand Canyon Avenue crossing; two groups totaling about 70 plants were at the proposed Sand Canyon Road crossing; about 60 plants were south southwest of station 9943, 1,000 feet west of Sand Canyon Avenue; and about 20 plants were found among the Chorizanthe population 2,400 feet west of the Sand Canyon Avenue crossing at station 9957. Figures 11 through 14 and 15 through 18 show the locales of this species within the Corridor. These locales are mapped from north to south. In some cases, a "population" may be made up of several locales or groups, as in the Bonita Canyon Reservoir area and in Laguna Canyon. Orange County Turkish rugging. Orange County Turkish rugging is a Feder- al Category 2 Candidate Species for threatened/endangered listing. It is listed on List lb by the CLAPS. Orange County Turkish rugging is endemic to the San -Joaquin Hills of Orange County. The San Joaquin Hills are surrounded by unsuitable habitat which serves to inhibit its movement to locales containing the nominate spe- cies. Unsuitable habitats include areas north and west of the San Joaquin Hills, historic areas of marshland, the Tustin Plain, areas with heavy clay soils located to the south and east that historically containing native prairie (now replaced by adventive grassland). The total historical range of Orange County Turkish rugging extends from the intersection of MacArthur Boulevard and Bison Avenue in Newport Beach south to a now possibly obliterated population in the vicinity of the Dana Point Headland. The taxon appears to extend inland from the sea about five or, six miles to Sand Canyon Reservoir, Irvine Ranch and the ridge east of El Toro Road on Aliso Viejo. A number of smaller, pocket populations exist in the vicinity of the Laguna Beach-Aliso Viejo area. Five localities of the target taxon were found in the APE, three within Aliso Viejo, one in the Sycamore Hills and one on the Irvine Ranch. The Aliso Viejo and Sycamore Hills material fits the key characters of the subspecies well but the Irvine Ranch specimens differ in some respects, particularly in involucre size and in growth form. Figures 11 through 14 and 15 through 18 show the locales of Orange County Turkish rugging within the San Joaquin Hills Transportation Corridor APE. 39 f It d> PA U) LU 1 I' Al j. Ul 0 9v ui 3. IM LU E Lu co Fn F_w Cc .9196 Lu V St, LLI cr LL > z Cj 0 Nx MATCH I fN , TA. 95 5-'00 ..i cc y { 0 C Y 01 U 0 ca Q -N �<< II, f W W U. Z V a - -- - -I a- _-.-_ r N C c0 V L U f!f SO � t] —. co 3'r Q � � N Woo J Cm < U is ca oil m -W = " M m m m = m go m " " m M,m M'm -'J pti 0 C\l C) V Lf) cc$ 8 - - 0 VJ .2 ca 0) CL E 0 Cfj al th co 0 w co- ca 0 +- cc o *Z 4) " C13 0 — co . L- 2 r 75 > ca C (D as 0 M 14 .L = 0 ca CO co, a) 0 CO < 'a- (D .0 E ca U) (D CD CD z w (D *� cr E w CD LU _j w Cq LL -on Oil -Al - Up w ,A �, �� �115�4111 94L k ........... N.. MATCH 11 f N sca T, 0 till . ........ . .. gwo WY Rd 0 ca 17 • I Nil- 81 IL 0 RIV 7a� Ix 41 0 •v. CL 0 to cl OR .5 S2 . tisda) 71 0 ........ ....... 5w A T 011 .42) 0 U. OAP"� / ,'��. � �� �;..;/. ,•�,j��=:.;:: 'p�J� ems'' -' :''r'• �c;�rt �.;.; ..> �' k „ 1 N i f p7CD Q'm LL \ i'z°a'; 1 - 1 j- 1 /I 1 i A _ u A,' :a ` / 1 , PU cc U j uiribeOr Ues W W J 0 co w w LL Z a w J Nc MA L C U s U _ 0 - 0 co U a) W z � Q ;, U Cf i Lo c fl. _' o E ¢CD . 3' z o `! `0 0 to 0 a � Q CO U cr m cr- Q 1 1 U D 1 1 w u_ cv y c c�n,�•� N a co 0L.. C (D m 0 E M-o u�.wcnaU 1 1 14 1 1 N d uA Q m ti w W M M W W aM w0 ao W W W N Z-. uj ZN G 0 Cl- CA Z H �a wa a 0 v p W ca <' .. _ W N LL. o d W a Co'. ! Cl) \ O V U W \ \ O / 1 \ r- V. O I I \ O O O co 0 cis a) N 4- .: n 1 N o 1 N p /' ► . / O al 0 4- .. F i 0 0 4- ! a 00 N 1 I N OI O cts f / r `° U ` I• W ~O m / 1 Z C.F— / v o I cc ED ' ..I' \I �I.'•. NI o gl oS• )a; }IsJenlun• a Im / :' .: i ��'• `_.' �' �^ O co 1 O o6a� a o M , Its ¢ n. \ I Ovp Y� ,n O ?4 N cc to U O NONCc \ t Q�d c CIO CO \ .. Q.• %'•; dp U) to `' a)oq 1 \ ., a \ ca V. CLI a� a \ . �, c cli co \ \ , A � a� Q 1 v c U 1 \ Cl) O CO o E7 / 1 L oct9u7tn W J r N d' U) W a� Z W 0 t3 Q w Z -W W W �z W Z tn- ap a0 2a 02 During the 1990 spring survey, four new populations of rugging were found. The largest population, containing hundreds of plants associated with Dudleya multicaults, was .between stations 9956 and 9958, the Sand Canyon Avenue and San Joaqui-n Hills Road crossings. The population is located on a slope approximately 2,400 feet west -of Sand' Canyon Avenue. Sixty more plants. Were ' near station 9964 between the Sand Canyon Avenue and San Joaquin Hills Road crossings. The population is located -on a knol-1 approximately 3,OOO*feet west of Sand Canyon Avenue. The remaining two populations were on the knoll across the road from the Bonita Canyon Reservoir dam. Thirty plants were near the, road and about 100 were clustered nearer the peak of the knoll. Laguna Beach dudleya. Laguna Beach dudleya 'is a Federal Category 1 Candidate Species for threatened/endangered listing. It is listed as "threat- ened" by the State of California and. list lb .of the CNPS. Present threats include intensive cattle grazing, fire and spillover impact from development. Laguna Beach dudleya is restricted to only five known populations; it is a suitable candidate for State and Federal Endangered status. No Laguna Beach dudleya was discovered within the APE. The Laurel Canyon population is approximately 2,500 feet south of.the proposed alignment. This population was inspected as part the survey and was in good Condit ion during 1983. Sensitive Wildlife Species Species of wildlife representing species of concern 'by the U.S. Fish and Wildlife Service (USFWS) include species that are candidates for'listing. As with plants, each year the USFWS updates species of concern for varying geo- graphic locales. The latest list issued to the'County of Orange was for Janu- ' ary 6, 1987, and includes those species on Table 1. Of the sensitive species listed, only the following species were observed along, the Corridor alignment: southwestern pond turtle-, tricolored blackbird, San Diego horned lizard, California gnatcatcher, cactus wren and grasshopper sparrow. these species were observed within the Corridor study area. Only those species .sighted within the alignment are discussed below. Monarch (Danaus plexippus). This species is included on the California Department of Fish and Game Natural Diversity.Data Base list of special animals ' but is not given any special designation. Monarchs congregate in large numbers in certain areas on their wintering grounds in California. Favored locations are therefore of particular importance.. A monarch seen near the proposed Sand Canyon.Avenue crossi.ng on 'May 25, 1.990, was part of no such congregation and is therefore'of little significance.. San Diego horned lizard (Phrynosoma coronatum blainvillei). This lizard, is a federal Category 2 Candidate species -and a CSC. It is found in western Riverside County, Orange County, and western San Diego County. Sandy 'washes and other open, sandy areas in coastal sage scrub are this species' favored habitat. Low bushes are required for cover, as well as open spaces for sun- ning, and relatively flat patches of fine, loose soil for burial. Its.primary 48 i 11 food source is harvester ants. The horned lizard was sighted along El Toro Road within the project APE. Orange -throated whiptail (Cnemidophorus hvpervthrusi. This reptile is a federal Category 2 Candidate species and a CDFG Species of Special Concern (CSC). Orange -throated whiptail is found in western Riverside County, Orange County, southwestern San Bernardino County and western San Diego County. It frequents dry, often rocky hillsides, ridges and valleys supporting broken coastal sage scrub habitats where it forages near the bases of shrubs and also underground for termites which are their main food source. This lizard also forages in dry, sandy washes. The whiptail was observed in the project APE in Sycamore Hills. Southwestern pond turtle (Clemmvs marmorata pallida). A population of southwestern pond turtle exists in the upper end of Bonita Canyon Creek in a pool formed at the base of the old spillway for Bonita Canyon Reservoir. Other populations are expected further downstream. The southwestern pond turtle is listed as a Category 2 species by the federal government and a Species of Special Concern by the California Department of Fish and Game. The pond turtle is a semi -aquatic turtle that prefers deep pools with soft mud bottoms and cattails. The turtle spends much of its time basking, frequently on mats made of cattails and similar herbaceous material. When approached, it quickly dives into the water and hides on the bottom. The turtle prefers crayfish and similar invertebrates that occupy ponded water habitats. Only one turtle was observed, just below the Bonita Canyon Reservoir dam. On June 12, this turtle was removed as part of the Pelican Hill Road Mitiga- tion. California gnatcatcher (Polioptila californica). This species is a federal Category 2 Candidate species and a second priority species on the California Department of Fish and Game Species of Special Concern list. It is found in San Diego, Riverside and Orange counties, in coastal sage scrub habi- tat which generally contains California sagebrush and/or brittlebush as a dominant component. The USFWS is currently compiling new and existing inform- ation on this species for a possible listing package in the coming year. The gnatcatcher was observed along the Aliso Viejo central ridge and at Bonita Canyon Reservoir. During the 1990 spring surveys, gnatcatchers were found at seven sites along the proposed Corridor route. The greatest concentration was observed on the north and west sides of Bonita Canyon Reservoir, an area more intensively covered than other portions of the route. Up to seven birds were observed at the Reservoir from May 16 to July 1. In addition, single birds were found in typical habitat near stations 9892-9895 on May 21, and near stations 10117 and 10118 on May 29. One bird southwest of station 10082 on May 29 was in an extensive area of mulefat. Another was observed foraging at the Pelican Hill Road mitigation site south of Bonita Canyon Reservoir on May 17 and 21. 49 7 u u 11 1 r H Golden eagle (Aquila chrysaetosl. This is a California Fully Protected Species, making it illegal to capture or collect individuals, and a CSC, third priority, indicating the species is not in immediate danger of extirpation. However, observation is warranted because of small population sizes. An immature golden eagle was seen flying over the project site in a southerly direction during the October 7, 1989 survey. This is a rare winter- ing species in coastal Orange County, and it is possible that the project site is 'part of this bird's winter territory. Golden eagles are not known or ex- pected to breed in this part of the County. Black -shouldered kite (El anus .caeruleus). This is another California Fully Protected Species, and is increasing its numbers throughout most of its range. However, it has been on a decade long decline in Orange County, appar- ently as a result of habitat loss. It occurs in the lower elevations where it breeds in sites with riparian trees such as oaks, willows, and cottonwoods. An individual was noted foraging in the adventive grassland and coastal 9 9 sage scrub habitats at the west end of the project site throughout the non - breeding months, and was noted on the September 28, 1989, survey. Although the oak woodland on the site is marginally suitable breeding habitat, black -shoul- dered kite was not noted during the Spring surveys. Therefore, it appears that the individual noted breeds elsewhere in the County and uses the project site as part of its winter territory. During the 1990 spring surveys,�two juveniles at Bonita Canyon Reservoir were the only ones noted along the Corridor route. Where these young were raised is unknown. Cactus wren (Campylorhynchus brunneicapillus). While not listed as rare or endangered, the CDFG has proposed a study of coastal populations in order to determined their status. These populations are declining at an unknown rate as a result of coastal sage scrub habitat loss. In coastal Southern California this species is found in coastal sage scrub containi-ng prickly pear cactus. Cactus wrens were noted in coastal sage scrub habitat in Upper Laurel Canyon and Bonita Canyon Reservoir. One nest was located, and three other nests were suspected but not located during the Spring surveys. During the 1990 spring surveys, these wrens were widespread in suitable habitat from the ridge between El Toro Road and Laguna "Canyon Road to about station 9990, in the canyon northeast of the proposed Culver Drive crossing, and in the vicinity of Bonita Canyon Reservoir. Grasshopper sparrow (Ammodramus savannarum). This sparrow is not listed by any State or federal agency, but is an increasingly rare summer resident in Orange County. Grasshopper sparrows .are found in relatively undi.sturbed and expansive grasslands, building their nest -on the ground. Most of the grassland habitat on and near the project site is ideal for this species. One grasshop- per sparrow was noted during the Winter surveys in Bonita Canyon Reservoir, and several were heard singing on the hillsides on and near the site during the Spring survey. Breeding occurs in the vicinity of the site, and may occur on the site as well. 50 1 Tricolored blackbird (Agelius tricolor). The tricolored blackbird is a federal Category 2 Candidates species. It is found in marsh habitats, especially in areas containing dense cattail stands. The tricolored blackbird nests in cattail stands, foraging in the surrounding upland habitats. The blackbird was observed in the Bonita Canyon Reservoir and would be impacted by the removal of wetland habitat in that area. Cooper's hawk (Accipiter cooperil. This medium-sized hawk is listed by the California Department of Fish and Game as a species of special concern, second priority. It is an uncommon winter resident of the region, and a rare summer breeder, preferring lower elevation woodlands composed of such tree species as willow, cottonwood, sycamore or oak. An adult was seen at Bonita Canyon Reservoir on July 1. It is unlikely this bird nested at the reservoir because no hawks were seen in May and June despite considerable coverage there. Northern harrier (Circus cvaneus). This hawk is also a second priority species of special concern, indicating that this species is declining in a significant portion of its range within the State, although the threat of extinction or extirpation is less imminent. It is an uncommon and declining wintering species in Southern California and a rare nesting species in summer. A pair of harriers seen between E1 Toro Road and Laguna Canyon Road on May 18 may have been in the vicinity of a nest, although this is unconfirmed. A single bird near the proposed Sand Canyon Avenue crossing on May 25 seemed only to be passing through. Willow flycatcher (Empidonax traillii). This small flycatcher is listed on the first priority list of species of special concern to the California Department of Fish and Game. It occurs throughout coastal Southern California as a uncommon spring migrant and fairly common fall migrant, generally in riparian areas. Nesting is rare and very local in the region, and extensive willow -riparian woodlands are required. Formerly, the species bred extensively throughout the region. Major declines in its preferred breeding habitat and brood parasitism by brown -headed cowbird are believed to have precipitated its rapid decline this century. One on May 29 and two on May 30 at Bonita Canyon Reservoir were consid- ered migrants, despite occasional singing by one bird on May 30 and the pres- ence of seemingly suitable nesting habitat. None were seen on subsequent visits to the area. Least Bell's vireo (Vireo bellii pusillus). This small passerine is listed as endangered by federal and State agencies. It breeds in dense ripari- an habitat with understory and structural diversity. A singing male was observed at Bonita Canyon Reservoir near the dam on May 16. Despite considerable coverage of the area from May 17 to July 1, the bird was never found again. This fits the pattern established in Orange County in recent years where no birds have been found to linger for any length of time. 51 t D 2 0 1 1 0 r ] C 1 �{ Yellow Warbler (Dendroica petechia). This is a California Department of Fish and Game species of special concern, second priority listing because breeding populations throughout the State 'have declined markedly. 'The species remains common as a migrant, however. Single birds were seen on May 21, 22, 25., 29, and 30 along much of the corridor route. All are considered migrants and only those on May 29 and 30 were in potential riparian nesting habitat at Bonita Canyon Reservoir and along Bonita Creek. None were seen on subsequent visits in June and July. Yellow -breasted Chat (icteria virens). Chats were observed at Bonita Canyon Reservoir on May 17 and 29, .June 15, and July 1. This is a known nest- ing area for this species and it is estimated that one or two pairs were pres- ent in 1990. California mule deer (Odocoileus hemionus). Particular interest and analysis has been focused on the possible presence of the California mule deer in the Corridor area. An analysis of mule deer movement activity was completed by P&D Technologies in November, 1985. The studies concluded that deer densi- ties are generally lower in the San Joaquin Hills than previously suspected (approximately five deer per square mil-e). This_ mule deer movement analysis was conducted in four different resource areas that overlap the Corridor area. Specific findings for the four areas are as follows: Laurel Canyon Watershed • Evidence of deer activity was found on the ridgeline 'between Upper Laurel Canyon and Upper Moro Canyon, in the Laurel Canyon riparian �! zone and on the northern ridgeline between Laurel and Shady Can- yons. UPRer Wood CanyonjEl Toro Cliffs The E1 Toro cliff area is frequently used by mule deer. • Mule deer have also been recorded in Wood Canyon., Upper Moro Canyon -Crystal Cove State Park • Moro Canyon -bottom shows sign of deer. However, the amount of deer activity is less than in Laurel or Wood Canyon. Sycamore Hills • This area experiences low deer activity. Wildlife Movement Corridors Wildlife movement corridors tend to follow canyon bottoms- dirt roads and flat areas along ridgelines. Associated plant cover with a height of at least four feet is an important element along the movement corridor (Jones and Stokes 1975). These corridors allow the larger `vertebrates (e.g.-, mule deer, coyote, 52 bobcat, gray fox, raccoon) to utilize large areas in the San Joaquin Hills and tributary canyons. Movement corridors are used for movement from breeding and resting sites to foraging and watering areas. These corridors are essential towards increasing food opportunities and obtaining scarce supplies of standing water. The major wildlife movement corridors within the Corridor and immediate vicinity include Bonita Canyon and San Diego Creek, and Upper Los Trancos Canyon, Upper Muddy Canyon, portions of the ridgeline road, Upper Bommer Can- yon, Upper Moro Canyon, Upper Shady Canyon, Laurel Canyon, side canyons in the Sycamore Hills, and Upper Wood Canyon. Generally, the canyon bottoms and ridgelines provided the most evidence of use by coyote and deer. During the time the biological surveys were conducted (spring/summer 1983, fall/winter 1984, spring/summer 1985) mule deer sightings were relatively rare, coyotes were seen on several occasions, bobcat evidence was sparse, and fox and raccoon tracks were observed occasionally in these areas. Aliso Creek is not consid- ered a significant wildlife movement corridor because of poor habitat cover adjacent to the watercourse, nearby development, flood control improvement upstream and poor quality upstream vegetation. Wildlife movement corridors also exist in the Sycamore Hills that may link up with the Camarillo Canyon area. However, this requires crossing Laguna Canyon Road. Heavy and fast traffic makes the area very hazardous for wildlife crossings (Jones and Stokes 1975). Another nearby wildlife movement corridor is Upper Wood Canyon with access to the E1 Toro Canyon and associated cliffs. A mule deer movement analysis was conducted by P&D during the fall of 1984 and winter of 1985. Deer move frequently between Moro and Laurel Canyon. Deer move in and out of Emerald Canyon and disperse north of the mid and upper reaches of Laurel Canyon, or move westerly to the ridge between Laurel and Moro Canyon. Deer also use Shady Canyon as evidenced by observations and tracks in the Shady Canyon reservoir area and track sets observed on the northern ridge of Laurel Canyon. However, it is apparent that deer activity is greatest south of the APE. The most important wildlife movement corridors include a combination of Upper Shady Canyon, the ridgeline road, Upper Laurel Canyon, Upper Bommer Canyon, and Upper Moro Canyon. The resources that make these areas important include oak woodlands, arborescent chaparral -covered slopes, surface water, outcroppings, caves and occasional seeps. The other important Corridor is the Bonita Canyon and San Diego Creek area, which provides water, cover, and food sources, as well as a link with Upper Newport Bay habitat. These movement corridors are considered to be the most valuable ones away from the San Joaquin Hills. There is evidence of deer movement in and out of Wood Canyon. However, there is little evidence that there is a high level of movement into the Syca- more Hills from either Wood Canyon to the east or Laurel and Camarillo Canyons on the west. Deer evidently use the Laguna Lakes primarily during times of poor water availability. More important, deer use the E1 Toro Cliffs on both the north and south sides of the Corridor. Mule deer home ranges are probably most concentrated south of the APE near Wood Canyon and its vicinity. 53 GENERAL INVIRONMENTAL IMPACTS The purpose of th-is section is to identify the impacts of degrading environmental quality within and around a regional assemblage of biotic,resour- ces. Impacts of Air Pollution on Vegetation A major air pollutant from automobile engineer exhaust is oxides of nitrogen, a precursor to the formation of oxidants and peroxyacetyi-nitrates (PAN) from pollutants already in the area. Nitrogen diox ide'(NO2) that is formed from the oxides of nitrogen (NOx) does not produce an adverse effect on vegetal materials and processes. Along roadways, a higher concentration of particulates exists due to increased proximity to the source. Particulates are not perceived to be a health hazard to plants in the area since they are not caustic. Automobiles also contribute carbon monoxide (CO) and hydrocarbons (HC). The effects of these pollutants on plants and wildlife are not well known. Sulfur dioxide is another emission generated from both stationary and mobile sources, though power plants are the main contributors. Sulfur dioxide is synergistic with NO2 at .05-.25 ppm, and the combined effect probably causes injury to field grown crops., ornamentals, and forest species (Thompson, Tingey and Reinhart 1974). Overall, this sensitivity is more apparent in 'evergreen trees which retain their leaves/needles for more than one year. Differences in such common environmental variables as soil moisture availability, air temperature, relative humidity, and wind, -have an important influence on the degree of plant injury to environmental pollutants, specifi- cally oxidants. Ozone is primarily responsible for injury to conifers. The role of other pollutants (e.g., PAN and NO2) assumes more importance with broadleaf trees, shrubs, and with herbaceous understory, plants, all of which are found in wetland habitats and may influence the rate of plant succession. Exposure to ozone at a concentration of .05 ppm for a few hours each day, produces injury and reduces growth of many plant species, especially for those plants grown in areas of high humidity. The so called "normal" (background) concentration of ozone i-s ..02-.03 ppm. When certain gases are mixed (such as 0, and SO?), studies have revealed that -antagonistic, additive, and even syner- gistic effects impact productivity. Impacts of Clearing Habitat and Fragmentation Construction, operation, and maintenance activities associated with roadway development constitute sources of environmental disturbance.' Marked changes in vegetation are frequently associ-ated with these disturbances. The most direct and long-term impact on the local biota is the loss of natural habitat from clearing, grading, and pavement laying." 1 54 This disturbance further fragments the habitat and creates an artificial barrier to movement by some secretive species (e.g., bobcat, gray fox). Fac- tors inhibiting movement include: 1) human disturbance; 2) herbivore grazing on the understory (already extensive in many areas of the APE); 3) nest pre- dation and parasitism by small mammals, jays, starlings, grackles, crows, and cowbirds which increase quantitatively in fragmented environments; 4) removal of surrounding habitat creating "islands" of vegetation that reduce the coloni- zation rate to a habitat island by reducing the number of available colonists and by making the remaining habitat less likely to be chosen by the potential colonists. Impacts of Air Pollution on Wildlife Available information on the effects of air pollution on wildlife popula- tions is limited. However, wildlife habitat (vegetation) is affected by cer- tain pollutant concentrations, which in turn impacts the abundance and integri- ty of associated wildlife species. Impacts of Noise on Wildlife Intense sound is an aversive stimulus for most organisms. Sound is capable of inducing measurable physiological and behavioral changes in some organisms. Bird vocalizations convey many types of information such as dis- tress, danger or alarm, warnings about territorial boundaries, recognition of a mate or of young, and presence of food. Substantial increases in background noise can mask these signals and potentially influence processes such as terri- toriality, spacing, nesting and care of young, detection of prey, or escape from a predator. Obviously, organisms that rely on auditory signals to effec- tively use the habitat will be most directly affected by vehicular traffic along the roadways. The larger mammals (e.g., mule deer, bobcat, coyote, skunk) will be most affected. The noise generated by traffic will ultimately influence their distribution in the APE. Large mammal occurrence north of the APE would be reduced. Areas south of the Corridor would be less affected due to the poten- tial for retreat to more remote areas of Moro, Emerald and Los Trancos Canyons. Avoidance behavior by large mammals will likely depend as much upon motion of the vehicles as noise. The greatest effect of noise on sensitive wildlife species is probably indirect: the reduction of land area available for habitation and concomitant reduction of population size due to avoidance behavior and preference for quieter territory. Roadway Impacts The presence of roads and highways has been found to impact wildlife occurrence, frequency and movement. Bird distributions are probably affected by roadways less than other vertebrate groups due primarily to their method of locomotion. Some species of 55 1' I birds are more affected than others. No significant differences are anticipat- ed regarding the distribution. of the majority of bird species, with respect to roads. The real impact is habit elimination from the roadway itself and the effects.of habitat fragmentation discussed earlier. The main impact on preda- tor birds may be nest predation by falconers and opportunistic bird species - that thrive in disturbed areas. The right-of-way habitat and the accompanyinged a will modify habi- tat. g fy the hab� tat. This modification may increase the abundance of many small mammal prey species by creating open areas 1n scrub! Road surfaces will significantly in- crease runoff. Collection systems will concentrate runoff to natural drainages in the APE. Greases and oils washed off pavement by rainfall may enter the natural drainages and harm vegetation. ' Runoff from roads may also contain heavy- metals detrimental to riparian -communities. Alteration of natural drainage from roadway -construction will modify the riparian plant communities by either reducing or increasing waterfiow in cer- tain drainages. Erosion in stream channels may be increased due to substantial runoff during periods of heavy rainfall. The Corridor will impact natural water supplies by affecting local drain- age patterns. Most important, the Corridor will act as a barrier, impacting the ability of wildlife to get to and from natural water supplies by dividing movement corridors -and fragmenting available habitat. Additionally, the Corri- dor directly impacts an estimate 12 acres of wetlands dePending upon which alignment is chosen. The assurance of adequate supplies of water for the .remaining faunal resources is one of the most important features of a.mitiga- tion plan for Corridor impacts. Direct Wildlife Impacts Direct impacts to wildlife include loss and fragmentation of habitat, barriers to wildlife dispersion, and loss of individuals from. road. kills. Indirect impacts include disturbance to wildlife due -to increised'noi_se levels and increased light and glare. It Road Kills. The development of the Corridor would create a road where none currently exists. Some wildlife would normally continue `to cross -the Corridor alignment after road construction, which would result in loss of wildlife from road kills. The major loss would be mammals and reptiles, be- cause birds would not be seriously affected by automobiles. However, the Corridor will be fenced with a five foot chain link fence,.al,ong its entire length. The fence will deter movement across the road by most wildlife spe- cies, resulting in a reduction in roadkills. Therefore, this potential impact is not considered to be significant. Loss and Fragmentation of Wildlife Habitat.. -As described in the plant communities section, the Corridor would remove approximately 571 acres of native plant communities (Conventional Alternative). Less mobile species such as reptiles and small rodents would be eliminated along with their habitat as the result of construction. More mobile species such as coyote and gray fox would possibly move off -site into adjacent habitats. Movement off -site will 56 not necessarily ensure survival of the resident wildlife. Generally, wildlife populations in any given habitat are at carrying capacities. There is no available habitat for wildlife moving into an area. Therefore, although more mobile species may not be directly removed by construction, the resulting overcrowding in adjacent habitats may result in an overall reduction in local wildlife populations. In addition, overcrowding will result in temporary increased competition for food resources and between prey items predator and agonistic encounters between individuals of a species. The loss of open space and wildlife habitat and probably loss of individuals constitutes a significant impact for the wildlife in the Corridor alignment. The reduction of wildlife habitat and populations is cumulatively significant for the County. Other Tyaes of Disturbances. Large mammals and most birds in the Corri- dor area are expected to have a low capability to withstand disturbances assoc- iated with grading and clearing activities. Wildlife studies have found that foxes, raccoons, skunks and coyotes generally avoid wide right-of-ways. Other studies have also shown that deer generally utilize habitat away from roadways more often than adjacent to them. However, the size of the road or vehicular volumes do not seem to be important factors. Cottontail rabbits are generally unaffected by right-of-way disturbance. For most species, habitat and water availability are the dominant limiting factors for survival of key species. Raptors are one of the most significant and sensitive types of wildlife within the Corridor area. Although some birds of prey such as the black -shoul- dered kite, American kestrel and turkey vulture can adapt to the presence of humans and human activities, raptors generally require large areas secluded from disturbance that contain suitable foraging and nesting habitats. Overall foraging habitat for raptors will be reduced by the Corridor. Some raptor nests within the Corridor area would be impacted by grading and site prepara- tion activities. This is a significant impact for all raptor species. Species anticipated to be impacted include the red-tailed hawk, barn owl, American kestrel, and great horned owl. Direct Plant Community Impacts Specific plant community losses were estimated by calculating the acreage of each plant community overlain on the Corridor alternative alignments. These losses represent the direct initial losses from site preparation activities. The plans for the two alternatives impact various plant communities as shown in Figures 1-5 for the Conventional Alternative and 6-10 for the Demand Management Alternative. Construction, operation and maintenance activities associated with devel- opment of the proposed Corridor will add to the extent of environmental distur- bance in the San Joaquin Hills. Marked changes in vegetation will occur with these disturbances. The most direct and visible impact will be the removal of natural habitat during brush clearing and construction. Important types of native habitat adversely impacted include wetlands, coastal sage scrub, chaparral and oak woodland. The impacts on plant communi- ties resulting from grading for the project alternatives represent the direct r 57 IS, U losses from construction activities, and are shown in Table 2. The impact losses vary, depending on the alternative selected. Between 13 and 16 acres of wetland habitat will be impacted as a result of construction of the Corridor alternatives. The loss of any amount of wet- land habitat is a significant impact that will require mitigation. Mitigation will be the replacement of habitat at a minimum 1:1 ratio of in -kind or higher quality habitat. There are between 253 and 255 acres of mixed chaparral, mixed coastal sage scrub, oak savannah and oak woodland directly impacted by the two alterna- tive routes. The loss of this amount of habitat would be a significant adverse impact. Mitigation of the loss area through revegetation would be difficult due to the large size of the area and poor likelihood of successful regenera- tion. Therefore, the impact will only be partially mitigated and will remain a .significant adverse impact. There area approximately 307 acres of adventive grassland, rock outcro s PP Y g � P and sand/ -gravel washes directly impacted. Removal of this amount of habitat is not considered significant in terms of habitat value, although grassland does J� provide opportunities for raptor foraging. No mitigation for the loss of this area will be required. Sensitive Plant Species. Besides plant community losses associated with the Corridor are losses associated with designated species of concern. Based upon the grading plans and field survey, it is estimated that approximately 1,995 plants of Dudleya multicaulis and 440 plants of Chorizanthe staticoides chrysacantha will be impacted due to the grading plan associated -with Corridor construction. The locations of these plants are illustrated on Figures 12- through 18, and previously described in this document under discussion of Biotic Resources. Sensitive Wildlife Species. The direct, local and cumulative regional loss of habitat and possible loss of individuals for the sensitive species identified in Section 3.6 due to the project are unavoidable adverse impacts upon those species. The sensitive species seen along the Corridor are: The Monarch butterfly (Danaus plexippus),. California gnatcatcher (Poliop- tila californica), San Diego horned lizard (Phrynosoma coronatum blainvillei), orange -throated whiptail (Cnemidophorus hyperythrus), southwestern pond turtle (Clemmys marmorata pallida), tricolored blackbird (Agelaius tricolor), yellow warbler (Dendroica petechia), yellow breasted chat (Icteria virens), golden eagle (Aquila chrysaetos), black -shouldered kite (Elanus caeruleus), Cooper's hawk (Accipiter cooperii), northern harrier (Circus cyareus), willow flycatcher (Empidonax traillii), cactus wren (Campy I orhynchus brunnei-capillus), least Bell's vireo (Vireo bellii pusillus), and grasshopper sparrow (Ammodramus savannarum). 1 58 1 TABLE 2 - PLANT COMMUNITIES - ACREAGES LOST HABITATS Conventional Grassland 301.4 acres Coastal Sage Scrub 156.1 Mixed Chaparral 76.2 Oak Savannah 0.7 Oak Woodland 21.6 Wetlands 15.2 TOTALS 571.2 59 ALTERNATIVES Demand Management 301.2 acres 153.3 78.7 2.1 20.9 13.8 568.0 I 1 Wildlife sightings are dependent upon many factors, including the time -of the survey, the weather, the season and other variable factors. Also, most factors that dictate the size of habitat for a particular species is not well known. Therefore, the quantification of impacts to wildlife is not possible at this time. Impacts to the vireo would be assessed based on the loss nesting habitat. Because no actual nesting habitat was located, impacts to this spe- cies is limited to the removal' of potential nesting habitat in Bonita Reser- voir. Regional Open SpaceJHabitat Areas. Orange County, in- conjunction with major landowners and with the City of Laguna Beach, has for the last decade gained binding commitments of major blocks of open space/habitat/recreation lands known as the Laguna Greenbelt. All of these lands have been assembled with the intent of creating large blocks of contiguous open space lands. These large blocks of open space would provide a much greater degree of habitat protection than attempting to mitigate projects one by one with a resulting fragmentation of habitat/open space areas. An example of such an approach is the creati.on of the 3,400-acre Aliso Greenbelt. Similarly, the Irvine Coast Open Space Dedication program will provide for the preservation of 2,666 acres of habitat and open space lands, which in combination with the 2,800-acre Crystal Cove State Park (created through State purchase and the Moro Ridge gift by The Irvine Company) will result in over 5,000 acres of contiguous open space/habitat areas. Another County action requiring the dedication of the Laurel Canyon area, which is contiguous with this 5,000-acre greenbelt, will add another 675 acres of open space/habitat. The individual open space dedications by area developments do not dis- count the fact that wil-dlife habitat continues to shrink in size in the south County. The County's Laguna Greenbelt open space preserve does not create more habitat. There is a net loss of wildlife habitat due to Corridor construction. As stated above, this is a significant impact and an unavoidable loss of open space/wildlife habitat. IMPACTS TO WETLANDS HABITATS Conventional Alternative Wetland habitats impacted by the Conventional Design Alternative are described by area in the following discussion. The Conventional design repre- sents a worst case impact scenario based on its larger overall surface area in comparison to the Demand Management Alternative. All acreage impacts to wet- land habitat are considered significant. The totals for the two alternatives are shown on Table 3. Oso Creek Impacts. Oso Creek has been channelized from south of the Corridor to north of Paseo de Colinas. Oso Creek does contain an established willow canopy near the proposed Corridor. Wetlands (1.4 acres) occurring north of the channelized portion will be impacted due to encroachment of the Corridor embankment. 60 TABLE 3 - WETLANDS IMPACTS IN ACRES FOR DESIGN ALTERNATIVES ALTERNATIVE Conventional Demand Management LOCATION San Diego Creek 4.8 acres 5.2 acres Bonita Creek' 1.2 0.8 Bonita Cyn. Reservoir 2.8 2.9 Laguna Canyon Road 1.1 0.9 E1 Toro Road 3.2 3.3 Aliso Creek 0.7 0.7 Oso Creek 1.4 0.0 Total 15.2 acres 13.8 acres Excludes 4.8 acres of wetlands affected by construction of Pelican Hill Road. 2 Excludes 4.0 acres of wetlands affected by construction of Pelican Hill Road. 61 1 1 t 1 I Aliso Creek Impacts. Aliso Creek is a perennial- stream, i-ncreasingly augmented by urban and irrigation runoff from upstream watershed development. A forested wetland habitat exists west of Alicia Parkway along Aliso Creek. Impacts at this site are expected to be minimal. because of the Corridor crosses a bridge over the creek. Within the actual crossing area, the band of riparian vegetation to be impacted is fairly narrow (0.7 acre). E1 Toro Road Impacts. A narrow forested wetland dominated by willow is located along E1 Toro Road, and, broadens at the north edge of the proposed Corridor. The Corridor will cross E1 Toro Creek on a bridge. The bridge coverage and one of the interchange ramps will impact 3.2 acres of habitat. The section of E1 Toro Canyon through which the Corridor- is proposed to cross has been significantly affected by urban development making wetland determination within this area very-compl.ex. Recent road building associated with the flood retention structure to the east of the Creek has eliminated some wetlands. Downcutting of the stream has drained some areas. Although they are still dominated by willow and such species as iris-lesaved rush (Juncus ziphiodes), they no longer exhibit characteristics of wetland hydrology. For this reason the wetlands remaining within the'�Canyon are restricted to 'the narrow band immediately adjacent to the Creek and a small vegetated overflow channel. Laguna Canyon Road Impacts. A narrow 1.1 acre band of scrub/shrub broad leaved deciduous/evergreen wetland located. along Laguna Canyon Road interchange will be impacted by the Corridor. This impacted area wil-1 also be impacted by the proposed widening for Laguna Canyon Road. The drainage has little flood control or groundwater recharge value; however, it is significant because of its relationship to the drainage of Laguna Canyon and because of its connection with the Laguna Lakes. Bonita Canyon Reservoir Impacts. The grading will remove approximately 1.0 acre of forested wetland, 1.2 acres of scrub/shrub broad leaved deciduous\evergreen wetland, 0.4 acre of emergent/persistent marsh and 0.2 acre of riverine intermittent streambed for a total of approximately 2.8 acres. Water in the wetlands of Bonita Canyon Reservoir is derived from urban runoff from Harbor View Knoll; San Joaquin Reservoir, Coyote Canyon drainage and upper Bonita Canyon. These wetlands provide a valuable vegetative communi- ty and wildlife habitat, particularly for birds. An estimated -ninety species of birds have been recorded at this location- since 1983. In addition, the reservoir traps sediments that otherwise would be deposited into San Diego Creek via Bonita Creek for ultimate disposal into the Newport Back Bay State Ecological Reserve. Bonita Canyon Reservoir is of significant value because of its functions, which include flood control, sediment control, groundwater recharge and wild- life habitat. The loss of wetland habitats in the reservoir area is more significant than other habitat areas because of these significant habitat values, the historical size of the reservoir, its role in'the watershed leading to Upper Newport Bay (a State Ecological Reserve) and its potential for en- hancement and utilization as an educational/recreational resource. 62 1 I Bonita Creek Impacts. Approximately 0.3 acre of riverine intermittent streambed, 0.8 acre of forested wetland and 0.1 acre scrub/shrub wetland will be removed from Bonita Creek. The riverine and scrub/shrub systems are dis- turbed and of lesser value than the forested wetland habitat. The forested wetland areas provide good habitat because of the mix of willow tree types. Bonita Creek provides some minor habitat and surface water for wildlife. San Diego Creek Channel Impacts. The Corridor will cross on a bridge over San Diego Creek. The area of the creek covered by the bridge will be 2.8 acres. The lack of light beneath the bridge will cause shading permanently impacting 2.8 acres of habitat underneath the bridge. Construction activity may also result in siltation flowing down San Diego Creek into Newport Back Bay. Refer to Section 4.17 of the Draft EIR/EIS for the Corridor, Construction Impacts, for a discussion of siltation control for project construction areas. Surface Runoff Effects. Storm water runoff coming from the Corridor will impact all wetlands cited above, as well as others not directly impacted during grading or construction. Collection systems will concentrate runoff in natural drainages or channels and storm drains along the Corridor. Alteration of natural drainage from Corridor construction may modify the riparian plant communities by either reducing or increasing waterflow in certain drainages. Erosion in stream channels may be moderately increased due to runoff during periods of heavy rain, leading to scouring of vegetation in the watercourse, drainage subarea or Swale. Demand Management Alternative The Demand Management Alternative has a slightly reduced cross section, but follows the same alignment' as the Conventional Alternative. Impacts of both alternatives in vegetation, wildlife and wildlife movement would be the same. The differences in acreage impacts are provided in Table 3 and impacts are illustrated in Figures 15 through 18. Oso Creek. The Demand Management Alternative crosses the concrete chan- nel portion of Oso Creek which does not contain any significant wetland areas. Therefore, the Demand Management Alternative does not impact any wetland habi- tat at Oso Creek. Aliso Creek. The Demand Management Alternative crosses over Aliso Creek on a bridge. Impacts to the forested wetland habitat result from bridge con- struction and shade effect and totals approximately 0.7 acres. E1 Toro Road. The E1 Toro Road wetl ands are dominated by a forested wetland habitat. The Corridor will cross over E1 Toro Road on a bridge. Expected impacts from bridge construction and shade effects a total of 3.3 acres. 'With exception of connection at I-5. 63 1 I Laguna Canyon Road. The Corridor will cross Laguna Canyon Road on a bridge. The habitat impacted by the Corridor will also be affected by the proposed widening of Laguna Canyon Road. A total of approximately 0.9 acres will be impacted by the construction and shade effects of the bri-dge: Bonita Canyon Reservoir. Grading in the reservoir and vicinity will impact approximately 0.2 acres of streambed, 1.3 acres of forested wetland, 0.9 acres of marsh and 0.5 acres of scrub/shrub habitats for an approximate total of 2.9 acres. Bonita Creek. The Corridor will remove nearly all of Bonita Creek resulting in an approximate 0.8 acres lost. Of this total, approximately 0.5 acres is streambed and 0.3 acres is forested wetland. San Diego Creek. The Corridor impacts in this area include the extreme northern end of Bonita Creek and the San Diego Creek drainage. Approximately 5.2 acres will be removed, of which-1.5 acres are forested wetland and 3.7, acres are freshwater marsh. Regional Impacts to Wetlands The overall loss of wetlands due to Corridor construct ion is regionally significant.- Each drainage contains only a narrow linear segment of wetland habitat, often not continuous throughout its length. Therefore, the removal of any portion of habitat along these drainages results in a net loss and, in some areas, increased fragmentation of this habitat; both effects are considered regionally significant. For each individual channel the removal and fragmenta- tion may or may not be substantial depending upon the individual drainage. However, the project's incremental removal of existing wetland habitats con- tributes to a significant cumulative effect on the regional resources. Regional habitat losses in Al i so and E1 Toro Creeks are not considered. substantial because these channels have been significantly altered by urban development. Aliso has been channelized along much of its length; E1 Toro has been affected by road building and flood retention basins that have resulted in drainage of some wetland -habitat areas. Oso Creek is partially channelized in .the vicinity of -the proposed con'- necti-on of the Corridor with I-5. Regional significance would occur with implementation of the Conventional Alternative, which would require removal of existing natural wetlands in the unimproved portion of the Creek. Construction of the Demand Management Alternative connection would, not require wetland removal and, therefore, would,not be regionally significant. The loss of habitats in the Bonita Canyon Reservoir and along. Bonita Creek is significant due to the extent and quality of the habitat. The pro- posed Corridor design would result in substantial losses of the Reservoir habitats, and the complete loss of habitat along Bonita Creek. These losses are regionally significant. I Regional losses to San Diego Creek will not be substantial. The Creek has been channelized for most of its length and, particularly in the area where 64 I it would be crossed by the Corridor, the wetland habitats are considerably reduced. IMPACT ON WILDLIFE MOVEMENT CORRIDORS General The construction operation, and maintenance of the Corridor will 11 create a physical barrier that will reduce the flow of genetic material between wild- life populations by restricting movement. Bommer, Shady, and Camarillo Canyon will be effectively isolated from Laurel, Muddy, Los Trancos, Moro, and Emerald Canyons. Wildlife movement corridors exist along Bonita Creek and San Diego Creek, Upper Shady Canyon, Upper Bommer Canyon, Upper Laurel Canyon, Upper Moro Canyon and Upper Wood Canyon. The most significant wildlife movement is associated with the Laurel, Shady, Moro and Wood Canyon areas and the E1 Toro Cliffs. The ridgeline that separates these canyons acts as a movement area in an east/west alignment and provides access to the north/south aligned canyons. The Corridor alignment runs just north of this east/west ridgeline, within the northerly watershed (south -facing slope) of Upper Laurel Canyon. This effectively yields an artificial barrier that removes Shady and Bommer Canyons from the ranges of all wildlife, but especially large mammals. Upper Laurel Canyon is still accessible for populations to the south, but the natural integrity of Upper Laurel Canyon will be impacted due to traffic noise, habitat reduction, road kills, soil compaction, reduced movement and problems common to a more sterile setting. Wildlife movement in Upper Wood Canyon and Bonita Creek will also be impacted. Bonita Creek will be realigned into a grasslined channel that cross- es through at least 15 culverts. Wildlife movement along this area will be impacted by this redesign. Laurel Canyon/ShadyJMoro Canyon Wildlife habitat is available immediately east of Shady Canyon but is very steep and generally poor for significant movement. Areas south of the Corridor, which include Crystal Cove State Park and Laurel Canyon, are slated for recreational open space. Consequently, the majority of the Laurel Canyon watershed is relatively suited to maintain movement into areas to the south. However, there is a linear section of land above Moro Canyon that is planned as low density residential. This land designation could have significant adverse impacts to the movement areas between Upper Laurel and Upper Moro Canyons. These land use designations, coupled with the changing land use character in Shady Canyon, will tend to reduce overall wildlife carrying capacity in Laurel Canyon. Upper Wood Canyon/El Toro Cliffs Rural residential and medium density residential uses are planned for a short reach in the E1 Toro Cliff area. These uses effectively terminate wild- life movement below the southern border of the San Joaquin Hills Transportation Corridor. The area of impact is just north of the deer movement transition between the bottom of Wood Canyon to the E1 Toro Ridge. Consequently, in order 65 1 for wildlife to reach the E1 Toro Cliffs south and north of the Corridor, they would be forced to access the E1 Toro Cliffs at a juncture further south and then, upon approaching the Corridor, constrained to steep slopes to avoid rural residential and medium density uses. It is projected that some movement could still exist but would be reduced. Cover, food and habitat availability are reduced as medium density residential is forecast for north, 'west and east sides of the E1 Toro Cliffs to the north of the Corridor. Fragmented habitat islands are created with no dispersal qualities except for reversing directions to obtain access back to Wood Canyon. Bonita Creek/San Diego CreekJSan Joaquin Marsh1Upper Newport Bav Bonita Creek is proposed for realignment into a grasslined channel which crosses through approximately fifteen culverts. This design will result in the loss of the entire wetland habitat value of the Creek. In addition, this design will strongly inhibit, if not prevent, wildlife movement down through the Bonita Canyon to Upper Newport Bay.: -Current adjacent land uses in this area are nonexistent, and future uses indicate that areas immedi-ately adjacent to the Creek will remain in open space. Therefore, this wildlife Corridor is an important one, and the loss of Bonita Creek constitute a significant una- voidable adverse impact. The Corridor will cross San Diego Creek on a bridge, similar to the existing Jamboree Road crossing. Therefore, wildlife movement from the San Joaquin Marsh to Upper Newport Bay will not be seriously impacted by the Corri- dor, except for those impacts associated with noise, light, and glare. Park and Ride Lots Park and ride lots would be placed such that no significant habitat areas will be impacted. Cumulative Impacts With the continued urbanization of Orange County, and the expansion of urban infrastructure in northeast and. southeast Orange County, considerable natural habitat and open space areas would be eliminated.. The cumulative im- pacts associated with regional habitat destruction are as follows: a. The prime impact would be the construction of the Corridor, in particular, project related grading. This would impact wildlife productivity within the region. In turn, the fauna would undergo pressures to relocate to suitable habitat. No species would be permanently displaced, although some individuals would be eliminat- ed during construction. b. Some of the predators and'prey with larger ranges and territories would be displaced into more remote areas. This is a disruptive force between predator -prey relationshi-ps.. J1 C. There would be a decrease in species diversity due to the decrease in variability of habitats within the Corridor's grading area. 66 L d. Total number of habitable acres available to wildlife would de- crease, causing increased competition for remaining resources. e. Tertiary and secondary consumers with larger ranges and territories will be displaced into more remote areas. This serves as a disrup- tive force between predatory -prey relationships, increasing the competitive forces between the higher consumers and limiting their ranges. Some prey and predator species have a tendency to increase dramatically around the fringes of urbanization and become a nuisance. Summary of Significant Impacts The Corridor would significantly impact the following biological resourc- es/issues: • Removal and fragmentation of wildlife habitat in general and forag- ing habitat for raptors. • Direct and cumulative (regional) loss of open space habitat and wildlife individuals. • Unavoidable adverse impacts to sensitive resources: Category 3 species: oak woodland, oak savannah, chaparral, coastal sage scrub, dudleya and Turkish rugging Sensitive wildlife species • Disruption of wildlife dispersion patterns • Night-time facility lighting on nocturnal wildlife activity 67 MITIGAThON MEASURES INTRODUCTION The construction and operation of the Corridor in the San Joaquin Hills will have a significant adverse impact on the regional assemblage, of biotic resources. However, there are also opportunities for habitat enhancement in remaining areas and mitigation that will reduce the amount of impact by the Corridor. WATER RESOURCESJWETLANDS The following discussion identifies mitigation measures for specific biological resources impacted by the Corridor. The Corridor will �impact 13-16 acres of wetlands in the APE. Water t resources and riparian communities directly affected by the existing grading- proposed for the Corridor include Bonita Canyon Reservoir, Bonita Creek, wet meadows/marshes In the Sycamore Hills, El -Toro Canyon, Ali -so .Creek and Oso Creek. Depending upon where and how earthen material spoils are placed, other areas such as Upper Laurel Canyon's riparian woodland may be impacted. One mitigation measure is the construction of "gallinaceous guzzlers." A variety of guzzlers are available for -range or .wildlife use. The guzzler eliminates up to 90% of evaporation. The unit is light and can be relocated if water needs change. A survival ramp i:s included so small game or rodents will not drown in the unit. The -guzzler can be easily transported to different areas as determined necessary during final design. Another potential water conservation and generation technique- are hori- zontal wells. Horizontal well technology recently has been applied to the management of wildlife habitat. Horizontal wells are an effective method of developing water supplies in arid, regions where more traditional methods may not be adequate. Maintenance requirements of horizontal wells are minimal. Water is brought to the surface by gravity flow, so no pumps are necessary. The only moving parts are a float valve, a vacuum relief valve, and a shut-off valve. The greatest advantage of the horizontal well, however, is that substantial water yields can be developed where little or no surface water previously was avail -able. This technique may be effective in the upper bowl of Upper Laurel Canyon as there may be a. number of seeps in the vicinity which support the bracken fern population. Other protection (Wyoming Game and Fish Dept. 1976) includes: a) not removing streamside or bank vegetation; b) not operating heavy equipment in any stream; c) building roads in dry weather to help prevent erosion; d) crossing streams at right angles to minimize bank disturbances. MITIGATION MEASURES To mitigate wetland losses, the following measures will be implemented: r68 1 Replacement Site Requirements. The applications for the 404 Permit and 1601 Agreement require a detailed Mitigation Plan. Resource agencies will need to be contacted in conjunction with the design of the plan. Actual replacement acreage, location and value of the replacement site will be determined through extensive coordination with the agencies and evaluation of the following op- tions: • Impacts to wetlands areas within the Corridor will be replaced at a minimum 1:1 acres of in kind or higher quality habitat. Wetland areas within the Corridor area, but not needed for project construction, will be designated as Environmentally Sensitive Areas (ESAs) on construction plans and fenced off for protection as a first order of work. During the process of obtaining required permits for encroachment into habitat areas (1601/404), the County of Orange will prepare a conceptual wetland mitigation plan and will coordinate with the affected resource agencies (CDFG, USFWS COE). The mitigation plan will contain the following: The potential wetland mitigation sites selected will be eval- uated for their suitability for use as riparian habitat miti- gation areas. The parameters evaluated will include, but not be limited to, soil condition, hydrology, geology and drain- age considerations, and level of difficulty of site prepara- tion. Maintenance and monitoring goals will be established that are compatible with mitigation plans that have been or are being developed for other projects in the vicinity of the Corridor. Examples of such projects are the mitigation plan for Pelican Hill Road, Aliso Viejo and Salt Creek. The components and implementation of the wetlands mitigation plan will include the following: a) A set of objectives for site selection and habitat replacement; b) Implementation specifications for vegetation types to be replaced, size and spacing of vegetation, irrigation techniques and soil treatments; and c) Maintenance and monitoring specifications including re- quirements for site maintenance, terms of maintenance, frequency of monitoring, financing mechanisms, perfor- mance standards and documentation of the implementation program. 69 1 F 1 1 11 1 11 1 1 1 L, - Coordination with personnel with CDFG,, USFWS, COE, County of Orange, UCI and Caltrans will take place during the prepara- tion of the plan. • A site or sites will be selected from the proposed mitigation sites selected for the Corridor. The site selection will evaluate these areas for use as mitigation sites. If necessary, additional sites will be evaluated for use as mitigation areas. The intent is to - replace the affected wetland habitat at a ratio of at least once acre for one acre. • In addition to selecting sites suitable for creation of new habi- tat, other sites will .be evaluated for potential enhancement of existing wetlands. These additional sites will be evaluated for acquisition and protection of wetlands, as well as increasing the habitat in these areas. • Where cut and fill slopes encroach on wetland habitats, the slope angles will be designed to as steep as possible to minimize lateral encroachment. • Graded material spoils will not be placed or stored .near any ripar- ian woodland area. Excess excavated materials should be hauled to planned disposal areas where it can be covered -'with soil and planted or beneficially used in some other manner, unless it can be used on the construction site. • Removal of streamside or bank vegetation will be avoided_ wherever possible, and the amount of habitat removed will 6,6 limited to the lowest minimum required for construction. • Wherever possible, heavy equipment will not be operated_ in areas identified as wetland. • Where feasible, construction improvements will, be conducted along riparian areas during dry weather and watercourses will be bisected at right angles to minimize damage to biotic resources. • Construction activities will be limited in nesting areas during raptor nesting season. These areas will be determined and mapped by a qualified raptor specialist prior to construction. No clear- ing or grubbing will be conducted in identified nesting areas be- tween January and August. • Wildlife will not be harassed. Harassment includes chasing, shoot- ing,.collection, etc. Enforcement of this measure will be coordi- nated by the Project Biologist. • Significant increases in peak downstream runoff rates caused by the Corridor will be controlled through implementation of water control devices to decrease scouring effects in the environmentally sensi- tive areas of Bonita, Bommer, Laurel, Laguna and Wood Canyons. 70 1 • Project design measures will maintain water flow to all drain- age/wetlands areas downstream of the project. Specific actions that would help to compensation for the wetland losses on site (i.e., Bonita Canyon/Coyote Canyon Road) are discussed below. POLICIES AND APPLICATION The U.S. Fish and Wildlife Service has specific policies towards mitiga- tion for displaced wetlands. There are an estimated 12-14 acres of wetlands impacted by the Corridor. Based upon the Service's Mitigation Policy Statement (Federal Register Vol. 46, No. 15, 23 January 1981) and correspondence received from the Service (Letter to Glenn Clinton - Federal Highway Administration) August 15, 1984; the principal mitigation is to avoid or minimize all signifi- cant impacts by modifying the project description. However, this is not con- sidered feasible and wetland impact is unavoidable. Section 404 Requirements Under Section 404 of the Clean Water Act, the EPA has promulgated guide- lines regulating the discharge of dredge and fill material into waters of the United States. The waters of the United States are under the jurisdiction of the COE, which is the permitting authority for discharge activities. The guidelines disallow discharge into waters of the United States unless no other practicable alternative exists that does not have other significant adverse impacts. Definition of Practicable Practicable alternatives are those that are capable of being completed after considerations of cost, existing technology, and logistics in light of overall project objectives. Practicable alternatives to be considered include areas that can be "obtained, utilized, expanded or managed" to fulfill project objectives, but may not be presently owned by the project applicant. Water Dependency and the Presumption of Practicable Alternatives Practicable alternatives which do not require discharge into special aquatic p sites (wetlands), i.e. are not "water dependent", are considered to have less adverse impact on the aquatic ecosystem and are to be considered over the preferred alternative. Executive Order 11990 1 Executive Order 11990, "Protection of Wetlands," requires that all federal actions be planned, constructed and operated to assure the protection, preservation and enhancement of the nation's wetlands to the fullest extent practicable. To comply with Executive Order 11990, FHWA procedures require that a Wetlands Finding be prepared for federal actions involving an EIS which are 71 1 located in or have an impact on wetlands. The assessment is included in Appen- dix B preparatory to the wetlands finding. SPECIES OF CONCERN There are no listed Federal or State plants or animals within the APE of the Corridor. There are two Category 2 candidate species for endangered or threatened status: the many -stemmed dudleya and Orange County Turkish rugging within the Corridor limits. Mitigation options for the many -stemmed dudleya and Drange County Turkish rugging include off -site acquisition of lands with same species, pay fee per habitat acre or plants lost and -transplantation of species (seed collection and propagation). Final mitigation plans shal-1 be determined in conjunction with a Memorandum of Understanding between the County, and the California Fish & Game Department (CDFG) and the U.S. Fish and Wildlife Service. • The salvage program for Orange County Turkish Rugging will include: - Salvage of the first six inches of topsoil from impacted habitat areas. The topsoil will be stockpiled for the short- est possible time before respreading at six inches depth. - The topsoil shall ,be respread on a site selected by a quali- fied botanist. Preferred sites include embankment areas of the Corridor. The mitigation sites will be in areas exposed to full sun. Shaded or partially shaded areas will be avoid- ed. - Seed will be salvaged during the spring and stored at a nurs= ery until the mitigation sites have been prepared. The seed will be raked in or hydromulched into the topsoil. There will* be no nurse crop i'n the hydromulch, and the spray- equip-ment will be cleaned out thoroughly to avoid contamination of the seed material. It would be appropriate to conduct a test program before the ful'l- scale mitigation project, since no past effort for relocation can be considered an unqualified success. • The -program for dudleya be salvage many -stemmed will a several part effort, consisting of: - Corms will be salvaged during the fall drought season and stored at a nursery until the mitigation site is prepared. - Topsoil will be salvaged to a depth of si-x inches from the surface and will be stockpiled for the shortest possible time prior to respreading to six inches depth. 72 [J Large blocks of substrate with the corms and associated flora kept in place will be salvaged and stockpiled for the short- est possible time prior to replacement on mitigation areas. • Reestablishment will include: - Salvaged corms will be placed in a nursery to provide a back- up seed source, in the event of initial failure to reestab- lish species in the wild. Dormant corms will be transplanted to appropriate locales where the species is not now present or occurs in low num- bers. - Transplantation and seeding sites will be created on the right-of-way. These will be in areas of rock outcroppings, where the embankment is stairstepped. This will provide flat areas for establishment of populations. Salvaged topsoil and soilblocks with plants will be placed on the crests of the stairsteps. Topsoil area will be seeded during the rainy season with seed salvaged from preexisting populations. East facing slopes will be selected for relocation sites. SIGNIFICANT WOODLANDS/HABITATS Significant wooded areas and streambeds occur in Upper Bommer Canyon, Upper Shay Canyon, Upper Laurel Canyon, Sycamore Hills, E1 Toro Cliffs and Aliso Creek. Considering the importance of streambeds and woodlands, it would be desirable to retain these areas in order to support as much of the biologi- cal integrity as is plausible. Regardless of the alignment, it would be advis- able to retain the canyon bottoms as intact as possible. Since many of the wildlife migration routes occur along the canyon bottoms, this measure serves a dual purpose. High bridge stream crossings be provided when they contain woodland areas. Their placement should be carefully developed during the preparation of a mitigation plan. Mitigation for impacts to mixed coastal sage scrub, mixed chaparral, oak savannah and oak woodland include avoidance and minimization of damage through erosion control, limiting construction during raptor nesting seasons, confining construction activities, replanting in the cut and fill areas, etc. More specific compensatory measures include: • Replace, restore or compensation for construction and operation impacts: - Plant saplings of tree species lost at appropriate locations along the Corridor. 73 1 1 - Enhance habitat by establishing trees or other vegetation in desirable/suitable areas off -site. - Where restoration/replacement is not practicable, compensate for loss by the enhancement of the remaining -communities on - site, pay a'fee per acre lost and preserve/restore comparable vegetation community off -site. • Development and implement a monitoring program -to identify baseline conditions to serve as a basis to monitor changes during construc- tion and operation. There are an estimated 19 - 20 acres 'of oak woodland and/or oak savannah impacted due to the Corridor grading. The overall goal of the program is to preserve and/or compens-ate oak tree losses by specifying the si-ze, quantity, and appropriate monitoring program to ensure a reasonable percentage of surviv- ability for the revegetation program. The program addresses transplantation, replacement and phasing schedules, biological control for mites, dust control, replacement ratios, size of material, irrigation requirements, costs, etc. It is the intent of the County of Orange to compensate for lost oak trees at an acceptable 'replacement ratio -and spacing criteria to minimize or reduce biolog- ical damage in the San Joaquin Hills due to Corridor construction. Replacement resources include a combination of plantings such as acorns, 5-gallon and 15- gallon trees and/or transplantation where feasible: The revegetation program will be consistent with project land uses in the area to ensure their long-term biological compatibility. Suitable planting areas include areas in local, County and State park and open space/conservation areas . In addition to oak trees, there are reductions i-n coastal sage scrub and mixed chaparral communities. It is the intent of the County of Orange to revegetate the Corridor's manufactured slopes with native coastal sage scrub in order to repl-ace some of the lost .habitat value. RAPTOR NESTING AREAS Many raptor species nest in the San Joaquin Hills and others use the area for wintering ground. Known nesting species on the Corridor include red-tailed hawk, kestrel, raven, great horned owl, and barn owl. Also, nesting- in the area are Cooper's hawk, black -shouldered kites, burrowing owls and screech owl s'. Mitigation measures include: a) road construction after hatching has occurred in these species; b) replacement of roosting sites removed by the Corridor away from the flow of traffic (Hall, T.R., W.E. Howard, and R.E. March 1981). WILDLIFE MOVEMENT CORRIDORS AND SUITABLE HABITAT General It is difficult Jo predict wildlife movement if further urbanization occurs in the area. There is a possible equestrian trail connecting the state- 74 1 owned Moro Canyon with the property north of the Corridor. Future greenbelt plans should be taken into consideration. These variables should be considered during the planning for mitigation of wildlife movement. Bridging the Canyons at key locations provides passage -ways for animals. Overpasses, underpasses, or pass -through culverts, should be considered. Based upon engineering constraints, budget and biological importance, these culverts or bridges should be prioritized based upon future open space plans in order to ensure that the most effective mitigation techniques are implemented. The drought use of tolerant and erosion resistant plant materials should be employed along the manufactured slopes where possible. If possible, native species should be used. The native vegetation will provide screening for wildlife and retain the natural character of the alignment. Along the right- of-way, fencing should be employed to protect wildlife from potential road kills and help to ensure safety of highway travelers. Vegetation removal should be kept to the minimum necessary for actual construction of roadways. An intensive and well -maintained revegetation pro- gram of non -surfaced construction areas should be undertaken immediately upon completion. Airborne particulate dust can be minimized by wetdown procedures during construction of the roadways. Relevant Movement Corridor Mitigation The following planning techniques and management practices will help to reestablish and/or maintain deer and free -ranging movement corridors and ame- liorate impacts due to the changing projected character of the area. Wildlife Movement Corridor Mitigation. The following planning techniques and management practices will help to reestablish and/or maintain movement corridors for wildlife and ameliorate impacts due to the projected changing character of the area. The Project Biologist will be consulted for the most appropriate implementation of these measures: A revegetation program will be instituted to rehabilitate slopes of the Corridor cleared during grading. Drought tolerant, erosion resistant native plant materials will be employed along manufac- tured slopes. This will provide screening for wildlife and retain some of .the natural character of the Corridor vicinity. To the maximum extent feasible, this vegetation will mimic the former habitats along the Corridor. Gallinaceous guzzlers (catch basin/watering devices) will be con- structed for wildlife use in Upper Laurel Canyon and Wood Canyon. The guzzlers will be designed to avoid acting as traps for smaller wildlife such as reptiles and small rodents. A revegetation program will be implemented by the TCA to compensate for lost oak trees at an appropriate replacement ratio and spacing criteria to be determined by the Project Biologist, Project Land- scape Architect and the County of Orange EMA. Replacement resourc- 75 1 n es will likely include a combination of plant sizes such as acorns 5 gallon and 15 gallon trees and/or transplantation where feasible. The revegetation program will be consistent with projected land uses in the area to ensure their long-term biological- compatibil- ity. Suitable planting areas include areas in local, County and State park and open space/conservation areas. Suitable sites will be selected with the help of a qualified oak tree specialist (or Project Biologist as appropriate) to be retained by the TCA as part of the Mitigation Monitoring Program for the Corridor project. A wildlife undercrossing (tunnel) will be included in the project • design ,in the Shady Canyon/Emerald Canyon area (Station 9844+00). This undercrossing is included in order to provide opportunity for free ranging mammals (mule deer [Odocoi7eus hemtonus]" in particu- lar) access to the permanent open space areas on both sides of the Corridor in this area. Final project design plans will include specific plan and cross section illustrations and specifications of this feature. Based upon the projected land uses in Shady Canyon, which are generally incompatible with significant wildlife movement, the construction of a wildlife underpass or bridge structure between Laurel and Shady Canyons would be warranted with inclusion into 'a limited access program for wilderness -type. uses (hiking, equestrian). As general plan build out occurs in the Shady Canyon vicinity. By providing a perennial water source at select locations within these movement areas, the need for wildlife movement across the Corridor would be s reduced and wildlife activity enhanced. 1 The Corridor does not directly impact movement between Laurel and Moro Canyons. However, it does impact wildlife habitat values in Shady and Laurel Canyons which could effect wildlife intent to disperse towards these areas. Regardless, there is no direct dispersal constraint between Laurel and Moro Canyons due to Corridor construction. The only directly related constraint is associated with the low density 'residential designation shown for the area above Moro Canyon. Suitable mitigation would be to retain wildlife habitat in this area to allow for continued movement. A wildlife underpass at Upper Wood Canyon this juncture could not be used by significant numbers of wildlife. By providing a perennial water source at this location, within the planned open space designations, the need for wild- life movement north of the Corridor would be reduced and wildlife activity enhanced. No suitable mitigation exists for the Bonita Canyon/Upper Newport Bay wildlife movement Corridor. Under the current channel realignment design, suitable mitigation would be to restore the channel to a natural condition and allow native wetland plants to revegetate the channel. In addition, a revege- tation program to replace native wetland plants, including sycamore and willow trees in the channel, should be considered. 76 1J 1 1 IAPPENDIX A 1 1 i 1 1 1 1 1 WETLAND IDENTIFICATION -AND DELINEATION SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR This report discusses the results of surveys by LSA Associates along the San Joaquin Hills Transportation Corridor to identify and delineate wetlands that would be subject to U.S. Army Corps of Engineers and Environmental Protection Agency jurisdiction under Section 404 of the Clean Water Act. The Corps is authorized to issue permits for the.d-ischarge of dredged or fill materials into the waters of the U.S., including wetlands, with program oversight by EPA. Waters of the U.S. in the vicinity of the project site include streams, associated adjacent wetlands, and certain other wetlands. METHODS The vegetation communities within the corridor were mapped by P&D i Technologies in 1983 with updated reports in 1986 and 1988. These reports ■ identify several plant communities as being wetland types. ,The survey performed by LSA Associates during the week of March 5, 1990 used the vegetation information collected by P&D to identify candidate wetland locations. LSA used the routine on -site determination methodology described within the "Federal Manual for Identifying and Delineating Jurisdictional Wetlands", the Unified Federal Methodology, January 10, 1989. Wetlands possess three essential characteristics: (1) hydrophytic vegetation, (2) hydric soils, and (3) wetland hydrology. These characteristics are mandatory and must all be met for an area to be identified as wetland. Hydrophytic vegetation is defined as macrophytic plant life growi-ng in water, soil or a substrate that is at least periodically deficient in oxygen as a result of excessive water content. Hydrophytic plant species are listed by the U.S. Fish and Wildlife Service in the National List of Plant Species that occur in Wetlands: California (Region 0). The list separates vascular plants into four t basic groups, commonly called "wetland indicator status", based on a .plant species' frequency of occurrence in wetlands: (1) obligate wetland plants (OBL) occur almost always in wetlands under natural conditions; (2) facultative wetland plants (FACW) occur in wetlands but are occasionally found in non -wetlands; (3) facultative plants (FAC) are equally likely to occur in wetlands or non -wetlands.; and (4) facultative upland plants (FACU) usually occur In non -wetlands but occasionally are found in wetlands. Hydric soils are defined as soils that are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions in their upper part. In general, hydric soils are flooded, ponded, or saturated for usually one week or more during the period when soil temperatures are above biological zero (41° F) as defined by "Soil Taxonomy". (U.S. Department of Agriculture Soil Survey Staff 1975). The National Technical Committee for Hydr,ic Soils has developed criteria for 'hydric soils and a list of the Nation's hydric soils (U.S.D.A. Soil Conservation Service 1987). Permanent or periodic inundation, or soil saturation to the surface, at least seasonally, are the driving forces behind hydric soil formation.. The 1 u presence of water for a week or more duringthe growing season typically creates 9 9 YP Y anaerobic conditions in the soil, which affect the types of plants that can grow and the types of soils that develop. Numerous factors influence the wetness of an area including precipitation, stratigraphy, topography, soil permeability,and plant cover. Water may be from direct precipitation, overbank flooding, surface runoff, ground water discharge, or tidal flooding. Investigations involved first the review of vegetation community descriptions and maps prepared by P&D Engineering and overlaying this information on 1:3600 color aerial photos taken in April and May of 1988, review of the Orange County Soil Survey prepared by the Soil Conservation Service (SCS), and review of the 1:2400 topographic maps prepared for the corridor project. Field investigations involved making several transects across candidate wetland and topographic areas and characterization of the plant communities within the areas. If the dominant species within the plant community were determined to all have an indicator status of OBL or OBL and FACW and the wetland boundary was abrupt; soils were assumed to be hydric and were not investigated. Soil characteristics were examined where the plant communities lacked the above characteristics. Finally, visual observations of wetland hydrology were noted. The Routine Onsite Determination Method data form included in the manual was used to record data on potential wetland areas (Appendix A). Where necessary, this data form was supplemented with additional soil profile descriptive information. Following field directly mapping on the aerial photographs, this i nformati on was. transferred to 1: 2400 to o ra hi c ma s . p ...................p..............::::::.:::::::::::: The field data forms::and soils i:nlormation from the Oran a Count Soil Surve FINDINGS Horno Creek A very narrow wetland vegetation community was found within the banks of Horno Creek to the east of the Santa Ana Freeway. P&D mapped the vegetation community of Horno Creek as a Riverine Intermittent Streambed. Although this community is dominated by blue gum (Eucalyptus globulus) an upland plant, these trees were rooted on the levee banks and not directly within the channel. The soil is composed of stratified sands and sandy loams. The SCS mapped the soils as Riverwash, a hydric soil mapping unit. Standing water was observed within the Creek channel. Evidence of an old road along the southern edge of the Creek was observed. This road may have been a source area for material used to construct a levee along the Creek. This levee has been breached in several places and evidence of overbank flooding, debris deposition, and water flow along the old road were evident. Periodic debris removal from the channel and levee reconstruction are expected to eliminate this type of flooding except during unusually large events. P&D mapped the vegetation communities surrounding the Creek as Grassland and Urban/Cultural-Altered. The SCS mapped the soils surrounding the Creek as Sorrento loam, a non-hydric soil type. No indicators of hydric soils were observed and the water table in this area was deep, below five feet. ITrabuco Creek A wetland vegetation community exists within those section of Trabuco Creek that have not been stabilized with concrete channel and riprap. P&D mapped the vegetation community within the channel as Riverine Intermittent Streambed to the south of the Santa Ana Freeway and as Sand/Gravel Wash to the north of the freeway. The Creek is dominated by giant reed (Arundo donax) and willow (Salix sp.) to the south of the Freeway and largely'unve9etated to the north of the Freeway. The SCS mapped the soils within the Creek as Riverwash, a hydric mapping unit. Standing water was observed within the Creek. Trabuco Creek shows evidence of past downcutting, having flood plain terraces 30 or more feet above the present channel bottom in some places. Because of this severe hydrologic break, the wetland community is restricted to the Creek channel although facultative species such as elderberry (Sambucus mexicanus) continue to occupy a significant portion of the plant community on the terraces. P&D mapped the areas surrounding the Creek as either Urban/Cultural- Altered, Coast Sage Scrub -Mixed, or Grassland vegetation communities. The SCS mapped the soils surrounding the Creek. as Soboba gravelly loamy sand and Sorrento loam. Soboba gravelly loamy sand is a hydric soil type while Sorrento loam is non-hydric. No evidence of hydric soils was observed outside the Creek channel. Oso Creek A wetland community exists alongOso Creek that is dominated b mule fat Y (Baccharis salicifolia), willow, and tree tobacco (Nicotiana glauca). This community is restricted to the immediate perimeter of the Creek channel but undoubtedly was more extensive prior to the construction of a flood retention basin adjacent to the Creek to the west. P&D-mapped the vegetation community within the Creek as Forested Wetland. The SCS mapped the soils within the Creek as Riverwash, a hydric mapping unit. The area surrounding the Creek appears to be both too high above the Creek, approximately 12 feet, to experience frequent flooding and is composed of very coarse textured materials that drain quickly and will not.pond. P&D mapped the area surrounding the Creek as a Urban/Cultural -Altered vegetation community. Indeed, within the flood control basin all vegetation had been removed and showed little evidence of regeneration. The SCS mapped the -soils surrounding the Creek as Corralitos loamy sand, a hydric soil type. However, while stream flow was observed within Oso Creek, the water table in the areas surrounding the Creek is deep and there is no evidence of hydric soils within this area. For these reasons, the wetland limits are restricted to the banks of Oso Creek. Aliso Creek Within the banks of Aliso Creek there exists a wetland community dominated by mule fat, giant reed, and.willow. The vegetati-on community within the Creek was mapped by P&D as Forested Wetl-and. The SCS mapped the soils within the Creek as Riverwash, a hydric mapping unit. Flowing water was observed in the channel. The terrace deposits surrounding the Creek are dominated by annual grasses that were mapped by P&D as a Urban/Cultural Altered vegetation community. The 1 r 1 soils surrounding the Creek are dark and have fine sandy loam textures which were mapped by the SCS as Sorrento loam, a non-hydric soil. The water table is deep since Aliso Creek is within a moderately deep (15+ feet) incised channel. To the south of the corridor on the east side of Aliso Creek a wetland community exists on the terrace deposit. The plant community is dominated by bermuda grass (Cynadon dactylon) and contains a small community of cattails (Typha sp.). Although it is unlikely that the transportation corridor will affect this wetland, it is mentioned here because it has not been previously mapped and so that appropriate measures can be taken to protect it during construction activities. P&D included this area within a larger Urban/Cultural- Altered vegetation community mapping unit. E1 Toro Canyon Creek The section of E1 Toro Canyon through which the transportation corridor is proposed to cross has been significantly affected by urban development making wetland determination within this area very complex. Recent road building associated with the flood retention structure to the east of the Creek has resulted in elimination of some wetlands. Downcutting of the stream has drained some areas so that, although they are still dominated by willow and such species as iris -leaved rush (Juncus xiphiodes) they no longer exhibit characteristics of wetland hydrology. For this reason the wetlands mapped within the Canyon are restricted to the narrow band immediately adjacent to the Creek and a small vegetated overflow channel. The creek channel is dominated by willow while the overflow channel is dominated by common plantain (Plantago major) and iris -leaved rush. P&D mapped this vegetation community as a Forested Wetland. The SCS mapped the soils within this area as the drained phase of Chino silty clay loam. Where Chino silty clay loam is undrained it is considered to be hydric. We observed that the soils within the Canyon vary from loamy sands to clay loamy, but within the Creek and the adjacent overflow channel they have prominent mottles within the upper several inches and should be considered undrained and therefore hydric. Laguna Canyon Heavy cattle grazing of the area west of Laguna Canyon Road and moderate stream downcutting has restricted the quality and extent of this wetland to a very narrow band of willow immediately adjacent to Laguna Canyon Creek. P&D mapped this vegetation community as Scrub/Shrub Wetland. The SCS mapped the soils of this area as Chino silty clay loam, a hydric soil type. Downstream on the east side of Laguna Canyon Road there are some large clumps of giant reed that P&D mapped as Emergent Persistent Marsh. The SCS mapped the soils of this area as Capistrano sandy loam, a non-hydric soil. Neither the soils nor the hydrology of this area exhibit evidence of saturation for long periods during the growing season. For this reason, we concluded that this area is not a wetland. 1-1 LJ 1 i ICoyote Canyon Area Within the un-named stream channel to the east of Coyote Canyon there exists a narrow wetland community that appears to be associated with an intermittent section of this drainage. P&D mapped this area as Riverine Intermittent Wetland. The community has scattered coast live oak (Quercus agrifolia) along the banks but where water accumulates is dominated -by emergent species such as cattails and watergrass (Echinoch)oa crusgalli). The SCS did not map the soils within the stream channel. Soils within the channel were not investigated by LSA since standing water could be observed in many places. A wetland community exists along Coyote Canyon Arroyo above where the Arroyo crosses under Coyote Canyon Road. This wetland community is restricted - to the stream channel and is dominated by willow. P&D mapped this community as Scrub/Shrub Wetland. Although the SCS mapped the soils within this channel- as Cropley clay, a non-hydric soil, soil mottling was observed as well as standing - and flowing water. For these reasons we concluded that the area is a wetland. A more significant wetland community exists on the east side of Coyote Canyon Road north of the point where Coyote Canyon Arroyo crosses under the road. This wetland is dominated by common spike-rus-h (Heleocharis macrostachya), cattail, and a few willow. P&D mapped this area as a continuation of the Scrub/Shrub Wetland further up the Arroyo and as Emergent Persistent Marsh. This r appears to be the old stream channel prior to its relocation during construction of Coyote Canyon Road. As a result, this area receives moisture .from Coyote Canyon Arroyo well into the spring and summer. Further north on Coyote Canyon Road there are two small wetland communities, one on either side of the road. These wetlands are dominated by common spike-rush and iris leaved rush. P&D failed to identify the wetland on the west side of the road but mapped the area on the east as Emergent Persistent Marsh. The soil was saturated to the surface with water standing in small depressions. These wetlands are located on slopes and it is suspected that the water derives from natural seeps associated with a geologic outcrop. Below where the Arroyo crosses under Arroyo Canyon Road there is a dense stand of mule fat. This community was mapped by P&D as Scrub/Shrub Riparian Forest. However, although mule fat is a FACW species, the soils are composed of coarse sands having a deep water table. Deposition of bed load by the Arroyo in this location has resulted in an alluvial fan deposit that receives moisture only in direct response to storm events. The failure of other wetland .species to occupy this area is further evidence that the area, following. brief periods of moisture, experiences extended periods of severe drought. The SCS mapped this area as Cropley clay, a non-hydric soil and obviously not the --soil found on this site. For these reasons this area is not a wetland. Immediately above the point where Coyote Canyon Arroyo intersects Bonita Creek a wetland community has developed behind a dirt access road. This area is immediately below the Scrub/Shrub Riparian Forest discussed above and has similar, although finer, soils. The plant community is dominated by a dense willow forest with some patches of common spike rush. P&D mapped this community as Forested Wetland. The slope of less than one percent and debris deposition L� are additional indicators that this area remains wet for long periods following storms. Bonita Creek On either side of Bonita Canyon Drive above the intersection with Coyote Canyon Road, there are linear wetland communities that parallel the road. The wetland on the north side of the road is dominated by iris -leaved rush and cattails, both obligate plants. P&D mapped this community as Emergent Persistent Marsh. Free-standing water was observed at a depth of 6 inches. Water appears to be from a natural spring. Although the SCS mapped this area to be Cropley clay, a non-hydric soil, we observed prominent mottles and gley at a depth of 2 inches. On the south side of the road the wetland community is contained within the channel of Bonita Creek. The community is dominated by willow and flowing water was observed within the Creek. P&D mapped this community as Forested Wetland. The areas surrounding these wetlands are dominated by Upland grasses and forbs including soft chest (Bromus mollis), mustard (Brassica sp.), and bull thistle (Cirsium vulgare) and are heavily grazed by cattle. The soils, while having dark surface colors, are typical of grasslands and exhibit no hydric soil characteristics. The SCS mapped these soils as Alo clay, a non-hydric soil. There is a small area that P&D mapped as Riverine Intermittent Streambed at the intersection of Bonita Canyon Drive and Coyote Canyon Road that, although dominated by willow, is not in a location that is expected to be saturated for one week or more during the growing season. The soils in this area were comprised of fill materials that were probably the result of road building. It is speculated that the willows may have predated the road construction and that they benefit from runoff from the road. For these reasons this area is not a wetland. Below Coyote Canyon Road the wetland community continues within the channel of Bonita Creek as it flows into Bonita Reservoir. As the stream enters the reservoir the wetland community widens to occupy nearly the entire area of this old reservoir. Standing and flowing water can be observed in many portions of the reservoir. The vegetation community is dominated by willow forest and was mapped by P&D as Forested Wetland. In most areas the boundary between the wetland and upland within Bonita Canyon is clear, however; areas mapped by P&D as Scrub/Shrub Riparian Forest and which are dominated by mule fat are not wetlands due to their xeric nature. We observed in these areas that the soils are excessively drained being composed of coarse sands and gravels and that the depth to water is several feet. A narrow wetland community extends to the south from Bonita Canyon Reservoir within a minor un-named drainage. This community is dominated by willow. The community was mapped by P&D as Forested Wetland. Flowing water was observed within the drainage. 6 1 I,] 1 n A minor side drainage to the un-named drainage discussed above, mapped by P&D as Scrub/Shrub Wetland, i.s a head -cut drainage that is dominated by mul-e fat. Upon further evaluation of this area we found no evidence of hydric soils or wetland hydrology. For these reasons this area is not a wetland. Below Bonita Canyon Reservoir a wetland community exists within the drainage. At the upper end the drainage is split and is dominated by emergent vegetation such as cattails. Further down the drainage the wetland is dominated by willow. This wetland community extends all the way to San Diego Creek although in the vicinity of the Christmas tree farm it becomes essentially a ditch with very little vegetative cover. This area was mapped by P&D as Emergent Persistent Marsh, Scrub/Shrub Wetland, Forested Wetland, and Riverine Intermittent Streambed. San Diego Creek The wetland associated with San Diego Creek that is within the corridor is affected by tidal action and is dominated by mudflats typical of tidal flats with saltgrass along the drier fringes where tidal inundation does not occur regularly. P&D mapped this area as Emergent Persistent Marsh. The SCS mapped the soils of this area as Tidal Flats, a hydric soil mapping unit. Above the north bank of the San Diego Creek to the west of the corridor there is a small degraded wetland that is dominated by tule (Scirpus californicus), cattails, and giant reed. Standing water was observed in the area. P&D mapped the area as Scrub/Shrub Wetland. Another wetland exists at the corner of Jamboree Road and McArthur. This wetland contains a small pond that is surrounded by tule, cattails, and willow. It appears that this may have been an old borrow pit or mine that has revegetated naturally over the years. P&D mapped the pond as Emergent Persistent Marsh and the surrounding wetland as Scrub/Shrub Wetland. The SCS mapped this area as a miscellaneous land type called Pits, a non-hydr-ic mapping unit. On -site evaluations showed that the soils were in fact hydric and the area should be considered to be a wetland. 7 1 APPENDIX A WETLANDS IDENTIFICATION AND DELINEATION 5 Fil 1 E B-2 DATA FORM ROUTINE O SITE DETERMINATIO METH001 Field Investig ): �- Date: 3�d , SD Project/Sits: State: County-: Applicantbwner. S ^�' Plant Community */Name:. -Ain� Note_ If a more detailed she description is necessary, use the back of data form or a field notebook_ Do normal environmental conditions exist at the plant -community? Yes )_ No •(if no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No-_.K_ (If yes, explain on back) --------------------------------------------------- VEGETATION Indicator Dominant Plant S ies Status Stratum Dominant Plant Species • 1, •• Q8t F�K1�1 -TF 11. 12. 3. 13. 4. 14. 6. 16. 7. 17. 10. 20. Percent of dominant spaces that are OBL, FACW, and/or FAC 4077d Is the hydrophytic vegetation c0odon met? ,,Yes No Rationale: Q`-c ,*.t 7`X.t --�� SOILS Sedes/phase: K +►t►-v %- Subgroup:2 Is the soil on the hydric soils list? Yes ^� No Undetermined' Is the soil a Histosoi? Yes No _ Histic spipedon present? Yes No Is the soil: Mottled? Yes No -.e_ Gleyed? Yes No x Matrix Color: Mottle Colo s �i 2 rr A Other hydric sVlls indicators. IVitAtt "Vl.l. ,, �� Is the hydric soil criterion met? 'Yes T No Rationale: - - -r" f✓; �-t �� HYDROLOGY Is the ground surface inundated? Yes No X Surface water depth: Is the soil saturated? Yes X No , + Depth to free-standing water in piUsoii probe hole: / -- List other field evidence of surface inundation or soil saturation. Is the wetland hrolooy criterion met? Yes No Rationale: o�l JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No Rationale for•jurisdictional decision: Indicator Status Stratum This data form can be used for the Hydric Soil Assessment Procedure and, the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy., 1 Frequency of Occurrence of Identified Plants _ with Known Indicator Status Frequency of Fo Ff Ff Flu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 2 -- 3-- 4 PROFILE SKETCH. COLOR TEXTURE STRUC- TURE CDI(SISTEHCE REAL- TIDH MISC: Roots, Pores, Clay films, Concretions 1 DATA FORM ROUTINE ONSITE DETERMINATION METHODI. Field Invest slo Date: 3/� 11q 6 b. )� a Projed/Site•' _ State: a- Coo Applicant/Owner: C Plant Community */Name: re� Note: M a more detailed site description is necessary, use the, back of data form or a field notebook. Do normal environmental conditions exist at the plant community? Yes _�E No (H no, explain on back) Has the vegetation, -soils, and/or hydrology been significantly disturbed? Yes No X (If yes, explain on back) VEGETATION Indicator Dominant Plant Species Status Stratum Dominant Plant Species 1. ra-s ee3�__ !!E�-4b 3. 13. 4. 14. 5, 15. 6. 16. 7. 17. 8. 18. g, 19: 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegetation c�rite�n metaYei , No�_� Rationale: ° ^-T—�•A-: _ !!Sitp� J --•-�""� 1 I 1 1 1 B-2 �% SOILS Sedes/phase: �t-f r � �`�' 4 4 • Subgroup:2 Is the soil on the hydric soils list? , Yes No _'�4 Undetermined -;Js the soil a Histosol? Yes No k Histic epipedon present? Yes No u Is the soil: Mottled? Yes No _y Gleyed? Yes No -Matrix Color: m 10 Mottle Colors: Other hydric soil indicators: - Is the hydric soil criterion met? Yes No X Rationale: T°° A •k ,4" �;' n� -� HYDROLOGY Indicator Status Stratum- Is the ground surface inundated? Yes No \C Surface water depth: Is the soil saturated? Yes No T Depth to free-standing water in ph/soil probe hole: --.-- List other field evidence of surface inundation or soil saturation. Is the wetland hydrolo¢ycriteripn met?. Yes �No fit_ JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Rationale for•jurisdictional decision: 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy." 1 Frequency of Occurrence of Identified Plants with Known Indicator Status. Frequency of Fo Ffw Ff Ffu Fu Occurrence ' Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland 4 Total occurrence for all plant species Total occurrences ID'd ' with known indicator status E.I. value REAC- MISC: Roots, Pores, T I ON Clay films, Concretions PROFILE SKETCH . -COLOR TEXTURE STRUC- TURE C'OHSISTENLE I r L� 1 1 1 DATA FORM ROUTINE ONSITE D MINATION METHODI Field lnvest ator tv� , - L.S Date:- 3/6 /4 a ProjecVSke:- ! te:--ee. County. / Applicant/Owner: Plant Community */Name: t rah 92 C'st,L�a rP Note: If a more detailed she description is necessary, use the bads of data form ora field 'no ok. --------------------------------------------------- Do normal environmental conditions exist at the plant community? Yes 4 No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? - Yes No Ix _ (If yes, explain on back) -------------------------------------------------.-_. Indicator VEGETATION Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status- Stratum 1. ro+�.- I %11. Fay U ~- c, 0 3. _ 13. 4. 14. S. 15. 6. 16. 7. 17. 8. 18. 10. 20. , Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegetation criterion met? Ygg N k Rationale: �A e el xn r .. ►?Q f� e! �'t' r SOiLS / � A,j {g as Seriestphase: S� `�` �'Q C�'�` Subgroup: Is the soil on the hydric soils listV Yes_ No Undetermined Is the soil,a Histosol? Yes No ` _ Histic epoWon present? Yes No x '.Is the soil: Mottled? , Yes No v Gleyed? Yes No. v Matrix Color:' 1A YP 317�;— Mottle Colors: _Other hydric soil indicators: Is the hydric soil criterion met? , Yes No Rationale: r' �� r l ` ''" r , / HYDROLOGY Is the ground surface inundated? Yes No Surface water depth: �`�� Is the soil saturated? Yes No k Depth to free-standing water in pit/soll probe hole: List other field evidence of surface inundation or soil saturation. 'Af ,r -f Is the wetland hydrology criterion met? Yes No Rationale: Y' A M n � -r- I & r rr c e no u] 30 r a�, � � e <-E-+'� a �+� JURISDICTIONAL DETERMINATION AND RATIONALE I is the plant community a wetland? Yes No l� Rationale for•jurisdictional decision: 11 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure.- 2 Classification according to "Soil Taxonomy" I B-2 I Frequency of Occurrence of Identified Plants with Known Indicator Status, Frequency of Fo Ffw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet Facult. Upland Upland _ Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 5 1 2 3 4 PROFILE SKETCH . COLOR TEXTURE STRUC- TURE CONSISTENCE RUC- T I ON MISC: Roots, Pores, Clay films, Concretions [j 11 1 1 DATA FORM ROqN5 ONSITE DETERMINATION METHODI Field Investigat 9S Dater' d Projed/SRe: fate: �' —County: `^ '" Appiicantown`er: C- Plant Community #/Name: '� •, ;=-" -=- �' Note: If a more detailed site description is necessary, use the back of data form or a field notebook. --------------------------------------------------- Do normal environmental conditions exist at the plant community? Yes .1_ No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No _*-/, (If yes, explain on back) --------- --- -------------------------------------:�;- VEGETATION A— Indicator Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status _ Stratum ' 2. G t: V� ��►�. /►�,j � FA•„�l• so7�12. _ ----- —' 13. 3 S. 15. 6. 16. 7. 17. 8' 19. _ 9. V 20. 10. Percent of dominant species that are OBL, FACW, and/or FAC ' Is the hydrophytic vegetation criterion met? Yes V No • Rationale:.—' �' n��---r�-.-A SOILS Sedes/phase: r^K'"4 `c - Subgroup:2 Is the soil on the hydric soils list? Yes . X No Undetermined 'is the soil a-Histosol? Yes No _ Histic epipedon present? Yes No" _ Is the soil: Mottled? Yes No VGieyed? Yes No �r Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes >l No Rationale: , �-A! B-2 HYDROLOGY is the ground surface inundated? Yes No y Surface water depth: Is the soil saturated? Yes Y No ► a Depth to free-standing water in phisoii probe hole: List other field evidence of surface inundation or soil saturation. ,4 rIs the wetland hydroly criterion met? Yes k No Rationale. -„!=}h .,4 `. . Ltd d''F t� r ► b�� a. '^_' JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes �_ N0 � 1 Rational, for'jurisdictio al decision: This data form can used for the Fiydric oil Asses ent Procedure and the Plant Community Assessment Procedure. 2 Classif iaation according to "Soil Taxonomy.' 1 Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ffw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland Total occurrence for all plant species --- Total occurrences ID'd with known indicator status E.I. value 1 2 3 PRON IE 'COLOR TEXTURE STRUC- SKETCH . I I I TURE REAC- MlSC: Roots' Pores' CONSISTENCE TIOH Clay films, Concretions I �.I 1 DATA FORM RO ONSITE DETERMIJ4AON METHODIFold Investigator(s): Date: Project/Slte: StateCoun N Applicant0wner. Plant Community a/Name: Note_ If a more detailed site description is necessary, use the back of data form or a field notebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes u, . No (if no, explain on back) --Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No k (if yes, explain on back) -----------------------------------------------=�_-- VEGETATION indicator ". Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status Stratum ,� 1 o t ; L - GSL— 12. - 3. 7lirn n �, a rt n .q a�u e a 13. 4. 14. _------ 6. 16. 7. 17. - 18. 9. 10. 20. ---- Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic 0 etation riterion met? Yees X _ No F Rationale: SOILS Serieslphase:1 `�" t' Subgroup:2 Is the soil on the hydric soils list? Yes )C No Undetermined Is the soil a Histosol? Yes Nov Histic epipedon present? Yes No Is the soil: Mottled? Yes No Gleyed? Yes No �. Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes-A..,No Rationale: =r �'.s , .I� >.� t +G-�• HYDROLOGY Is the ground surface inundated? Yes No : Surface water depth: Is the soil saturated? Yes No `a It Depth to free-standing water in phisoil prone hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology criterion met? Yes Rationale: C Lc wk P JURISDIC11ONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes � o Rationale for Jurisdictional decision: 1 t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy." Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ftw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland .w Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value I I 11 11 1 2 3- 4 5 ' PROFILE COLOR TEXTURE STRUC- SXETCH . I I - TURE REAC- j MISC: Roots, Pores, , CONS 1 STENCE T I OH Clay films, Concretions 11 11 11 C 1 1 1 I 1 J 1 B-2 ......rx•.-•------ DATA FORM ROUTINE ONSITE DETERMINATION METHODI Fetid Investigator(s): 1 �--� Date: 3/C� ProjecUSfte: State: _ — Coun a %A f e r Applic:ant/Owner: Plant Community #/Name: l Note:. If a more detailed site description is necessary, use the back of data form or a field notebook. --------------------------------------------------- Do normal environmental conditions exist at the plant community? Yes -A, No (N no, explain on back) .; Has the vegetation, soits�and/or hydrology been significant disturbed? - - - - - - - - - - - Yes _' No (K yes, explain on back) t/ a► 4*1 - - - - - - - .� Indicator VEGETATION Indicator .%&- Dominant Plant Species rr Status Stratum Dominant Plant Species Status Stratum 1. rV P 101. 2. 12. 3. 13. 4. 14. 5. 15. 6. 16. 7. 17. 8. 18. 9. 19: 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC >a Is the hydrophyt' vegetatio criterion mete • Yes No u Rationale: �e l .., L„�'i� A,,,, Series/phase: -r4h h ^ `/ ' `'�'~" �f • Subgroup:2 Is the soil on the hydric soils list? Yes _.X ONo Undetermined Is the soil a Histosol? Yes No X Histic spipedon present? Yes No ` Is the soil: Mottled? Yes No ti Gleyed? Yes No Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes No Rationale: HYDROLOGY Is the ground surface inundated? Yes No Surface water depth: Is the soil saturated? Yes No Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology Grit non met? Yes No Rationale: A JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No % .. Rationale for'jurigdictional decispn: AA/,c-.�,.n1� .�, 7 �► ; d 0-rL �c' • ► �' Ai r.++ S ., 1 This data form can be used f?r the Hydric Soil bssessmentfirocedure and thVPlant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy.' rj Frequency of Occurrence of Identified Plants with Known Indicator Status - Frequency of Fo Ftw Ff Ffu FU Occurrence Total for Facuft..- Facuft. Plant Species Each Species Obligate Wet. Facult. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value PROFILE STRUC- SKETCH. 'COLOR TEXTURE TURE I � I � I' ■7 I � J 2 3 • 4 --5--- , REAC— MISC: Roots, Pores, CDWSISTEHCE TIDN Clay films, Concretions' 11 1 I 1 DATA FORM ROUTINE ONSITE DETERMINATION METHODI Field investigate ): nAx- Dater ��y PMJG /Sfte• State: mot. County: Applica►ntiOwner: Plant Community ftMamS-IM1� Now if a more detailed site description is necessary, use the back of data form or a field notebook. " - P kY Do normal environmental conditions exist at the cant community? Yes X No (If no, explain on back) ' Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No X (If yes, explain on back) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Indicator VEGETATION Indicator - Dominant Plant Species Status Stratum Dominant Plant Species Status Stratum 12. 3, ld. 110 ..2 T 13. 4. 14. 6. 16. 7. 17. 8. 1.8. 9, 19. 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC / D L�2 IS the hydrophyt'ic vegetation riterion rpet? Yes _ �' No Rationale: s ' • - - 4-c a e �— R L ��A ��� � SOILS Sodas/phase: d "B' k, .4 C'^�'� Subgroup:2 Is the soil on the hydric soils list? Yes. No Undetermined Is the soil a Histosoi? Yes No Histic epipedon present? Yes No Is the soil: Mottled? Yes No- Gieyed? Yes No Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric s0114rderion met? Yes 'y o Rationale: B-2 HYDROLOGY Is the ground surface inundated? Yes No X Surface water depth: Is the soil saturated? Yes : No it Depth to free-standing water in ph/soil probe hole: 62 List other field evidence of surface inundation or soil saturation. Is the wetland hydrology criterion met? Yes X No _� Rationale: 4!-r &r L mA e"I rt H col 41 e ,Pj . K a JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes Rationale for jurisdictional decision: A 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to "Soil Taxonomy." 1 Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ffw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland i '.M Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2 3 4 5 STRUC- REAC- MISC: Roofs, Pores, TEXTURE -CDHSISTENCE PROFILE -COLOR DATA FORM ROUTINE ONSITE QETERMINATIOtMETHOQt } Flak! tnvestiga �(s): / ' w`40 Dats:. - el Project/She: State: _. Ce_ Cou ty: Applicant/Owner. Plant Community */Name* r . ' Note_ If a more detailed she description is necessary, use the back of data form or a fteld notebook_ — — — — — Do normal environmental conditions exist at the plant community? Yes 7C No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No k (If yes, explain on back) -----------------------------------------------1— I 1 VEGETATION Indicator indicator Dominant Plant Species Status Stratum Dominant Plant Species _ Status 2, 12. _ 3. 13. 4, 14. S. 15. 6. 16. 7. 17. 9. 19. 10. 20. Q�c� Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegettion criterion et? Yes , �k Rationale: —,A lg, J Stratum .Ar— SOILS • Series/phase: �`���"-^^� Subgroup? Is the soil on the hyi5ric soils list? Yes No A Undetermined _, is the soil a •Histosol? Yes No _=Histic epipedon. present? Yes No Is the soil: Mottled? Yes No X Gloved? Yes No Matrix Color: 42 Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes No Rationale: HYDROLOGY Is the ground surface inundated? Yes No Surface water depth: Is the, soil saturated? Yes No _� Depth to free-standing water in ph/soll probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology c ' erion met? Y s No ` Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE ' Is the plant community a wetland? Yes No Rationale for'jurisdictional decision: mil �,a ( 1 I B-2 t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2Classification according to "Soil Taxonomy.' fl Frequency of Occurrence of Identified Plants with Known Indicator Status - Frequency of Fo Ff Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland r t� - Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2 3 4 5 MiSC: Roots, Pores, PROFILE SIRUC- REAC- SKETCH • COLOR TEXTURE TURE CONSISTENCE T IDN Clay films. Concretions c� v 3 v'F v e r �t �• . /OVA -�5 c Sa6k DATA FORM ROUTINE ONSITE DETERMINATION METHODI Field Investig r(a): � Date: A Projed/Site: State: County: . �Q _ J ApplicantJOwner: Plant Community 0Mame: L1L(Q�t,rt, r F K Note_ K more detailed site description Is necessary, use the back of data form or a field notebook_ — — — — — Do normal environmental conditions exist at the plant community? Yes V No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No \,-# (If yes, explain on back) ----------------------------------------------- VEGETATION I,i Indicator Indicator Dominant Plant Senles Status Stratum Dominant Plant Species Status Stratum 2, Cf 12. 3. 13. 4. 14. 5. 15. 6. 16. '7. 17. + 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC le 0 ., Is the hydrophytic vegetatiog criterion me� Yesx No �- Rationale: zo `� aktr4.4 , ^ ^r! s..... C [ SOILS Sedes/phase: �1 -'L-� ��-r^ "'- -- Subgroup:2 Is the soil on the hydric soils list? Yes K No Undetermined .,Is the soil a Histosol? Yes No y Histic epipedon present? Yes No. `,' ' Is the soil: Mottled? Y s V No Gleyed? Yes No y Matrix Color: 37, Mottle Colors: at•� "�' �' Other hydric soil indicors: - Is the hydric soil criterion met? Yes X No Rationale: _T,..„ t� ��q— � n,-,T_P/1"," HYDROLOGY Is the ground surface inundated? Yes Noy Surface water depth: Is the soil saturated? Yes V No Depth to free-standing water in ph/soil probe hole: - List other field evidence of surface inundation or soil saturation. Is the wetland hydrology criterion met? Yes y No , Rationale: onrp�c ,� ► 3 / dtz for VP JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes V No Rationale for'jurisdictional decision: t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to "Soil Taxonomy.* I B-2 - 1 Frequency of Occurrence of Identified Piants with Known indicator Status ' Frequency of Fo . Ffw Ff Ffu Fu Occurrence Total for . Facult. Facutt. Plant Species Each Species Obligate Wet. Facult. nd Upland U la rh A10 -- .t Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 2 — — 3—_' 4 irm PROFILE STRUC- COLOR TEXTURE CONSISTENCE MICH . I I I TURE ,5C T(t $S,l;:) REAC- MISC: Roots, Pores, TION Clay films, Concretions VP Y- DATA FORM 1 f� 1 n 1 I �1 ROUTINE ONSITE DETERWNATI METHODI 3 Field Invest at r �t �-S Date: Projewske: , State:--�---- County: _ ,Qlie rP 01 AppiicantlOwner. Plant Community */Name: b( G�LaF-r1 Note_ K a more detailed site, description is necessary, use the back of data form or a field notebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes , A No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes--- No�_(If yes, explain onback) - - - - - - - - - - - - - - - - - - - - - - - - - - ----- Indicator -- VEGETATION Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status Stratum 12. 2. 3. 13. 4. 1. S. 15. 6. 16. 1 7. . 18. 8. _ 9. 19 10. . Percent of dominant species that are OBL, FACW, and/or FAGIs the hydrophytic vegetation criterion met? Yes No Rationale: SOILS Subgroup:2 Series/phase: ,...a Is the soil on the hydric soils list? Yes No Undetermined Is the soil a Histosol? Yes No 'y _ Histic epipedon present? Yes= No k is the soil: Mottled? Yes _ '�t No Gleyed? Yes No Matrix Color: Mottle Colors. Other hydric soil indicators: Is the hydric soil criterion met? Yes u No Rationale: HYDROLOGY arcils-w o Is the ground surface inundated? Yes 19— No,. Surface water depth: Is the soil saturated? Yes_ No j f o Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation.' Is the wetiand hydrology criterion met? Yes No Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE 1Is the plant community a wetland? Yes > _ No ' Rationale 1pr'jurisdictional decision: t. B-2 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy.' 1 Frequency of Occurrence of Identified Plants with Known indicator Status Frequency of Fo Ffw Ff Flu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicatcr status E.I. value 1 1 2 3 4 5 PROFILE COLOR TEXTURE STRUC- I CONSISTENCE REAC- MISC: Roots. Pores, SKETCH. I I THE I TIDN I Clay films, Concretions I �S 3 t3 JI i2 to ,u yl�/► rjr i �' y t Pr e.5 1 P `' rG p� SI Sa�� 3 Y,�� I �-'3 v� 1. '� DATA FORM ROUTINE SITE DETERMINATION METH001 Field Invest ig t r(s): .� 4S Date: _5 1--7714764 Project/Ska State: Coun r AppiicanUOwner: Punt Community $/Name: Note_ If a more detailed site description is necessary, use the back of data form or a field notebook_ — — — — — Do normal environmental conditions exist at the plant community? Yes __ No (If no, explain on back) ' Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No _1K— (If yes, explain on back) ------------------------------------------------.--- VEGETATION Indicator Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status Stratum 1. A 01 44— 11: 2. •� 3. 13. 4. 14. 6. 16. 7. 17. 8. 18. 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegetation criten n met? /< No Rationale: 1 1 1 I 1 11) , �� , I�'_ SOILS Sodas/phase: ^�'',A� �``"`R Gam m 40` t Glkt O Subgroup:2 Is the soil on the hydric soils Fitt? ''es No Y Undetermined Is the soil a Histosal? Yes - No 7C Histic epipedon present? Yes No Is the soil: Mottled? Yes No 'A Gleyed? Yes No X _ Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric sot! critermet? Yes o Rationale: 4 _ HYDROLOGY Is the ground surface inundated? Yes No X Surface water depth: Is the soil saturated? Yes X No Depth to free-standing water in ph/soil probe hole: List other field evidence of surface inundation or soil saturato . met? Yes,_ No Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes Nq T _ ,,,— X /)_ This data form can`be used for iiie HydrFc S( Assessment Procedure. 2 Classification according to "Soil Taxonomy." B-2 - - e-, Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ffw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. J • •Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value ---2 — — 3 PROFILE 'COLOR TEXTURE STRUC- SKT-TCH . I I I TURE A .� C.I S o.6 k CONSISTENOE 4r SS 0 REAC- MSC: Roots, Pores, TION Clay films, Concretions A f P Yllo� fl I 1 11 1 #1 B-2 DATA FORM '� ROUTINE Of1SITE DETERMINATION METHODI Field Invest ( ,(-�� 3 ig (a): �"s/g Date: � 40 ProjecVSite: State: a-- Coun�- ApplicantOwns. Plant Community #]Name: Note_ If a more detailed site description is necessary, use the back of data form, or a field notebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes X No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No X (If yes, explain on back) ---- --- ------------------------------------------- Status Stratum Dominant Plant Species Indicator VEGETATION Indicator "'* Status Stratum Dominant Plant Species 1. CV- 11. � 2. S R 12. 3. 13. 4. 14. S. 15. 6. 16. 7. 17. a. 16. 9. 19:' 10. 20. c, Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegetation criterion mqt? Yes 1( No Rationale: in i� -c ✓. .,[w,.,.�e� ,✓- !S ;we t�-; 18 L � F� SOILS Series/phase: ' "'a" e " G� '�`'' eo , " Subgroup:2 Is the soil on the hydric soils lilt? fes )< No Undetermined Is the soil a Histosol? Yes No _T Histic epipedon-present? Yes No k Is the soil: Mottled? Yes v No Gleyed? Yes No Matrix Color: Mottle Colors: Oth h d ' 1 ' dicators• M• er y roc soi in Is the hydric soil criterign met? Yes )_ N00%"' Rationale: _� +�1 — 44 � �` ' 1-4TE -' HYDROLOGY Is the ground surface inundated? Yes No k Surface water depth: Is the soil saturated? Yes _K No Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydr lo¢y criterion met? Yes 5e No Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No Rationale for jurisdictional decision: t. GC..AP-r:,''^"� 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy." I SOILS Series/phase: ' "'a" e " G� '�`'' eo , " Subgroup:2 Is the soil on the hydric soils lilt? fes )< No Undetermined Is the soil a Histosol? Yes No _T Histic epipedon-present? Yes No k Is the soil: Mottled? Yes v No Gleyed? Yes No Matrix Color: Mottle Colors: Oth h d ' 1 ' dicators• M• er y roc soi in Is the hydric soil criterign met? Yes )_ N00%"' Rationale: _� +�1 — 44 � �` ' 1-4TE -' HYDROLOGY Is the ground surface inundated? Yes No k Surface water depth: Is the soil saturated? Yes _K No Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydr lo¢y criterion met? Yes 5e No Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No Rationale for jurisdictional decision: t. GC..AP-r:,''^"� 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy." I Frequency of Occurrence of Identified Plants with Known Indicator Status. Frequency of Fo Ftw Ff Ffu Fu Occurrence Total for Facutt. Facutt. Plant Species Each Species Obligate Wet. Facutt. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2 3 4 PROFILE SKETCH COLOR TEXTURE STRUC- REAC- MISC: Roots, Pores, TUBE CONSISTENCE T I OA Clay films, Concretions ,c�,onl�eKa t t � 4, co ,qe( )PY DATA FORM ROUTINE ONSITE DETERMINATION METHODI "3 0 Fold Invest r(s} ►� apt� 1q) Date: ProjecUSite State: -�a..— Coun : Applicant/Owner: Plant Community'O ams: v Note_ If a more detailed site description is necessary, use the back of data_form or a field notebook_ — — — — — Do normal environmental conditions exist at the plant community? Yes K No (If no, explain on back) ' Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes . No (If yea, explain on balk) ----------------- -----------------------------------. 1 I ri 1 1 i t B-2 VEGETATION Indicator Dominant Plant Species Status Stratum Dominant Plant Species 1 J ./ /2 11. 'Bk 12. 4. ..1- 5. 5. 6. 16. 7. 17. tl. 18. 9. 19: 10. 20, q Percent of dominant species that are OBL, FACW, and/or FAC Is the hydrophytic vegetation criterion.met? Yes X Nq - Rationale: Indicator Status Stratum _ yy SOILS Seriestphase:11 ' ,1�, ``�'`" -� � Subgroup:2 Is the soil on the hydric soilsflit? files No ._XUndetermined Is the soil a Histosol? Yes No x Histic epipedon present? Yes No ')0, Is the soil: Mottled? ^ Yeg No _) Gleyed? Yes No Matrix Color: �• Y K— Mottle -Colors: Other hydric soil indicators: Is the hydric soil criterion,met? \Yes _,No _Z�--_ _ A 0 J _ P ._�� r h�11�47V 5 61-� 'rHYDROLOGY D Is the ground surface inundated? Yes - No _�, Surface water depth: - Is the soil saturated? Yes No= Depth to free-standing water in ph/soil probe hole: i2z List other field evidence of surface inundation or soil saturation' rol criterion met? Yes No Is the wetland�h d o�y ,)K_.... Rationaie.„ �, C T'1h0x •.. 7 1 i .e�' . � JU ~ 1SDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No Rational@ for jurisdiction 1 decision: is da a o r n se o the . y c Soil. Assessment Procedure and the Plant Commun' Assessment Procedure. 2 Classification according to "Soil Taxonomy.' Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ftw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet Facult: -' Upland Upland .r -s t Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2 3 4 5 PROFILE COLOR TEXTURE STRUC- SKEICH . I I TURE REAC- CORSISTME TIDII MISC: Roots, Pores, Clay films, Concretions 1 ll t I DATA FORM ROUTINE SITE DETERW TION METHODI 3 Field Investigator(a); �� ' � � L S � Data. ProjKVSite: �" Stater Counir. ►� Applicant/Owner: lant Community #E/Name: Note_ - - - if a more data a scription is necessary, use the back of data form or a field otebook_ - - - - - Do norm I environmental conditions exist at the plant community? Yes & No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No _ C� _(tf yes, explain on back) ----------------------------------------------- -- VEGETATION a:. Indicator Indicator Dominant Plant S ecies Status Stratum Dominant Plant Species Status Stratum 1. �-�' ' wow �* F�►'�-� f i A� . 11. ' 3. 13. 4. 14. 5. 15. 6. - 16. 7. 17. 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC Is -the hydrophytic vegetatio criterion met? Y X No r Rationale: , :n�•:....� as5 �.�o SOti.S Sedes/phase: �' -��-t^ Subgroup:2 Is the soil on the hydric soils4ist? s No X_ Undetermined Is the soil a Histosol? Yes No Histic spipedon present? Yes No Y Is the soil: Mottled? Yes ti No Gleyed? Yes �► No Matrix Color. Q • S V _37Y Mottle Colors: Other hydric soil indicators: Is the hydric soil crit r n finet? Yes V, No Rationale: Mom• nC c..� fix"--��x! B-2 HYDROLOGY Is the ground surface inundated? Yes No k Surface water depth: Is the soil saturated? Yes No _, Depth to free-standing water in pit/soil probe hole: List other field evid pm of surface inundation or spit saturation. is the wetland by �orl y crit ire o e es y No Rationale: ��a - n 04-W 61 JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetiand? Yes N/ N le•----- Rationale for jurisdictional decision. �, .1 -P c A, I'm This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment'Prooedurs. 2 Classification according to "Soil Taxonomy.' 1a...- n Frequency of Occurrence of Identified Plants With Known Indicator Status . J Frequency of Fo Ftw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facuft,Upland Upland Total occurrence for :w• all plant species --- Total occurrences ID'd with known indicator status E.I. value 2 3 4 5 1 5= - ■l PROFILE STRUC- RFAC- NISC: Roots, Pores, SKETCH . I 'COLOR I TEXTURE TUBE COHSISTEH�E T lOtr Clay f i lms, tDncretions j6 V C C NL 3 ►o.-. �- V t ✓ter 4,0,4/ �a4o�c�� I I DATA FORM ROU7iNE SITE DETERNNIA ON METHOD' _. 3 / Fieldinvestigat r(s): �'s4 ProjarJ/Sfte: s:—�.--- Ceunt�: r Applicant/O--- r Plant Community */Name: `? Note_ If a more detailed site description is necessary, use the bad* of data form or a field notebook_ — — — — - -Do normal environmental conditions exist at the plant community? Yes Y No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No Y (If yes, explain on bad*) ------------------- ------------------ ----------_�„-- VEGETATION indicator Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status — Stratum 2. � 12. 4. 14. 6. 16. - 7. 17. 8. 1.8. 9. 19: • 10. 20. Percent of dominant species that are OBL, FACK and/or FAC 4 Is the hydrophytic tation crite on met?- Yes No %r Rationale: AO �'." SedWphase: �� �"^ SOILS Subgroup? Is the soil .on the hydric soilAt? Ye� No Undetermined Is the soil a Histosol? Yes Is the soil: Mottled? Yes No No v Histic epipedon present? Yes No = Gleyed? Yes No ` Mottle Colors: Matrix Color: Other hydric soil indicators: Is the hydric soil criterion? -Yes No B-2 1 HYDROLOGY Is the ground surface inundated? Yes No x, Surface water depth: Is the soil saturated? Yes No `/ Depth to free-standing water in ph/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology critgrio met? Yes No Y Rationale: JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes yo X Rationale for jurisdictional decision: t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. Z Classification according to "Soil Taxonomy." t Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Fl Ff Ftu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facult. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status �E.1. value 1 2 _ 3___ 4 5 PROFILE -COLOR TEXTURE STRUC- I CONSISTENCE REAC- MISC: Roots, Pores. SKETCH. I I I TURE TI pM Clay films, Concretions 1 t t 1 I B-2 DATA FORM ROUTINE ONSITE DETERMINATION METHO01 Fold Invest ig (s): 1//' A K K LS A) Date: 9a Project/Site: State: 4a Coun L r Applicant/Own... PlantCommunity #/Name* Note_ If a more detailed site description is necessary, use the back of data form or a fiel&hbtebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes r No (tf no, explain on back) _ Has the vegetation, soils, aridlor hydrology been significantly disturbed? Yes . No �- (If yes, explain on back) ------------------------------------------------ VEGETATION -e:. Indicator Dominant Plant Species Status Stratum Indicator Dominant Plant Species Status St 1. T� Zo 11. 2. �_ 12. 3. "�' - : L ' �� 13. 4. 14. 5. 15. 6. 16. 7. 17. 8. 18. 9. 19: 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC > Is the hydrophytic vegeta 'on 0Ze merlon mgt? W.�/'s'""'-.� Yes �- No Rationale: . �A ► �.., z a SOILS Series/phase: " Subgroup:2 Is the soil on the hydr' soils lis(? Yes No Y Undetermined Is the soil a Histosol? Yes No Histic epipedon present? Yes No �- Is the soil: Mottled? Yes x �lo Gieyed? Yes No..` Matrix Color: -' Pk�'•� -Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes No Rationale: C-0�<- .,, E2$6 - dd�0 &-e .� 4= %� Z-�- Is the ground surface inundated? Yes No X Surface water depth: Is the soil saturated? Yeses_ No `�-c ,-� �I F Depth to free-standing water in ph/soil probe hole: a '° ' Last other field evidence of surface- inundation or soil saturation. '! Is the wetland hydrQio¢y criterion met? Yes '� No r Rationale: a .,��'}a dry �i,( , /^ JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant- community a wetland? Rationale for•jurisdictional decision: t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to 'Soil Taxonomy." I Plant Species _ Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value Frequency of Gccurrence of Identified Plants with. Known Indicator Status Frequency of Fo Ftw - Ft Ffu Fu Occurrence Facult. Total for Facult. Each Species Obligate Wet. Facuit. Upland UI 1 2 3. 4 5 PROFILE STRUC �REAC- UTCHS. I COLOR ITEXTURE TUBE C"SIS?EHCE TM It MISC: Roots, Pores, Clay films, Concretions 1 r F] DATA FORM ROUTINE TSITE DETERMINATION-Ii MODI Field Invest at a):. Gt%�'� ►+�4 �, r` L S Date: 3 ProjKVSite: : State: -Q Coun ra-t .— Applicant/Owner. Plant Community #/Name: L�-- S- S Note_ If a more detailed site descriptioh Wneoessary, use the back of data form or a field notebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes >,-_ No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No �_ (If yes, explain on back) -----------------------------------------------Iw.-- Indicator Dominant Plant4SPV693 Status St 2. 12. 3. 13. 4. 14. 5. 15. 7. 17. 8. 18. 9. 19. 10. 20. Percent of dominant species that are OBL, FACK and/or FAC °J0�% a Is the hydrophytic vegetation criterion met? Yes v No Rationale: VEGETATION - Indicator Dominant Plant Species Status Siiatum SOILS Series/phase: Subgroup:2 Is the soil on the hydric soils listci Yes No _X Undetermined Is the soil a Histosol? Yes Is the soil: Mottled? Yes = No x Histic epipedon press t? Yes No �_ No Gleyed? Yes �No Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes _Y No Rationale: ��'-►►. ��,�,c fi_�, f.= -a HYDROLOGY Is the ground surface inundated? Yes No Surface water depth: Is the soil saturated? Yes V No Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology criteri n met? Yes No Rationale: i �r � T'r - JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes No Rationale for jurisdictional decision: r�a.�t=, . �� %� 1 This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to "Soil Taxonomy.' B-2 r Frequency of Occurrence of Identified Plants with Known Indicator Status, Frequency of Fo Ftw Ff Flu Fu Oca:urrence Total for ' Facult... Facult. Plant Species Each Species Obligate Wet, Facutt. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2_ 3 4 5 PROFILE COLOR TEXTURE I STRVC- SKETCH. TURE CUHSISTENCE REAC— I MISC: Roots, Pores, TION Clay films, Concretions 1 r I 1 1 .DATA FORM ROUTINE ONSITE DETERMINATION METHOD' Field Investigator ` �'t '"� °-"'"` Date:�a Project/Sits: State:.-4a — CountyK et Applicant/Owner, _ " Plard Community O/Nams: Note_ K a more detailed site description is ecessary, use the back -of data form or a field notebook — — — — — Da normal environmental conditions exist at the plant community? Yes i_ No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes • No _ (If yes, explain on back) ------------------------------------------------ Indicator VEGETATION - indicator Dominant Plant Species- Status Stratum Dominant Plant Species : Status Sfr-atum 2. _ 12. 3 0 13. 4. 14. 5. 15. 6. 16. 7. 1-7• 8. 18. 9. 19: 10. .. c:, ..:. �a rs�i w. 20. Percent of dominant species that are OBL, FACW, and/or FAC > Is the hydrophytic vegetation criterion met? Yes \;e No ' Rationale: Z A_- k 202:4 >_ 2 A t SOILS Series/phase: �'�—Subgroup:2 Is the soil on the hydric soils li ? Yes No X Undetermined Is the'soil a Histosol? Yes No \� Histic spipedon present? Yes No u_ Is the soil: Mottled Yes No V Gleyed? Yes No a' Matrix Color: '^� `� ; Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes No `,C Rationale: j ^ r % " '► HYDROLOGY Is the ground surface inundated? Yes No X Surface water depth: Is the soil saturated? Yes _ No Depth to free-standing water in pit/soil probe hole:r` List other field evidence of surface inundation or soil saturation. { Is the wetland hydrology cr#erion met? Y„es,.. Up -;, !�_ U U U JURISDICTIONAL DETERMIN"ON AND RATIONALE Is the plant community a wetland? Yes No tionale f�f jurisdictio I decision: ;� /%- -��`�' 1 This data form can be used for the HydridySoil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classif ication according to 'Soil Taxonomy.' Frequency of O=rrence of identified Plants with Known Indicator Status Frequency of Fo Ffw Ff Flu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet. Facuft• Upland Upland Total occurrence for all plant species ---- Total occurrences ID'd with known indicator status � 3 4 E.I. value 2- PRONIE COLOR TEXTURE SKETCH. STRUC- TURE REAC- CDHSISTEHCE TIDH RISC: Roots, Pores. Clay films, Concretions I 11 I DATA FORM ROUTINE ONSITE DETE NATION METHODI Field Investigator(s): t �, aLw LS 7 Project/the: a"" tate: County: Applicant/Owner: Plant Community #/Name, C q— Note_ — tf a more detailed site description is necessary, use the bade of data form or a fienotebook_ — — — ak ; Do normal environmental conditions exist at the plant commurAy? Yes _4 No (If no, explain on back) Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes k' No (If yes, explain on back) 4 i 1 ic., ,./ (c ren ca s o ( ,- — e ------------------------- ----- ---------- — VEGETATION Indicator Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status Stratum n) RL 11. 3. 13. 4. ` ^''' 0It L- 14. 5, 15. 6. 16. 7. 17. 8. 18. 10. 20. Percent of dominant species that are OBL, FACW, and/or FAC %_ Is the hydrophytic vegetation criterion eYes o � = -- % z' Rationale: Kw SOILS Series/phase: Subgroup:2 Is the soil on the-hydric soils list? Yes No '-4 Undetermined Is the soil a Histosol? Yes No Is the soil: Mottled? Yes No Histic epipedon.present? Yes No Gleyed? Yes No Matrix Color: Mottle Colors: Other hydric soil indicators: Is the hydric soil criterion met? Yes No Rationale: HYDROLOGY Is the ground surface inundated? Yes No Surface water depth: Is the soil saturated? Yes No Depth to free-standing water in pit/soil probe hole: List other field evidence of surface inundation or soil saturation. Is the wetland hydrology criterion met? Yes No Rationale: 4)h 7 l - JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes '' No ° Rationale for'jurisdictionai decision: -J _1 t This data form can be used for the Hydric Soil Assessment Procedure and the Plant Community Assessment Procedure. 2 Classification according to "Soil Taxonomy." I B-2 1 Frequency of Occurrence of identitivo runts_ with Known indicator Status Frequency of Fo Ftw Ff Ffu Fu 1 Occurrence Facult. Total for Facult. Plant Species Each Species Obligate Wet. Facult. Wand Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status g 4 5 E.I. value 2 PROFILE STRUC- SKETCH. COLOR TEXTURE THE REAC- CDHSISTEHCE TIDA MISC: Roots, Pores, 111 Clay films, Concretions 1 1 1 1 DATA FOR ROUTINE ONSITE DETERMINATION METHOD' Fwld Investig or(s): �'� �- Date: 8 Project/Sfte: State:-�G-- County: Q AppiicanVOwrier: T'r' PIaM Community #t/Name: Note_ H a more detailed site description is necessary, use the back of data form or a field notebook_ - - - - - Do normal environmental conditions exist at the plant community? Yes V_ No (H no, explain on back) _ Has the vegetation, soils, and/or hydrology been significantly disturbed? Yes No �< (H yes, explain on back) -----------------------------------------------I Indicator VEGETATION Indicator Dominant Plant Species Status Stratum Dominant Plant Species Status_ Stratum ,� /. tC3" n 11/ 2. 12.13. 3. 4. 14. 5. 15. 6. 16. 8.19. 18. 10. 20. - Percent of dominant species that are OBL, FACW, and/or FAC /D Is the hydrophytic vegetation cr anon met? Yes X Np Rationale:�1�-°,- t._ Sodas/phase: � � ""' C'Q��`�"��� -cubgroup:2 Is the soil on the hydric soils list? Yes No Y Undetermined Is the soil -a Histosol? Yes No y_ Histic epipedon present? Yes No Ioo- r�sthe soil: Mottled? Yes T No Gleyed? Yes '7 No Matrix Color: Mottle Colors - Other hydric soil indicators: Is the hydric soil criterion met? Yes No Rationale: 1 B-2 HYDROLOGY Is the ground surface inundated? Yes No \ Surface water depth: Is the soil saturated? Yes 7C No Depth to free-standing water in pit/soil probe hole: Y41 List other field evidence of surface inundation or soil saturation. JURISDICTIONAL DETERMINATION AND RATIONALE Is the plant community a wetland? Yes X No ` � r Rationale for'jurisdictional decision: This data form can be used for the Hydric Soil Assessment Procedure andthe Plant Community Assessment Procedure. 2 Classification according to "Soil Taxonomy W Frequency of Occurrence of Identified Plants with Known Indicator Status Frequency of Fo Ffw Ff Ffu Fu Occurrence Total for Facult. Facult. Plant Species Each Species Obligate Wet Facult. Upland Upland Total occurrence for all plant species Total occurrences ID'd with known indicator status E.I. value 1 2 3 4 PROFILE 'COLOR TEXTURE STRUC- CDHSISTENDE REAC- MISC: Roots, Pores, SKETCH . TURE T IDN Clay films, Concretions 1 1 1 1 l 1 .��.... E: United States Soil 711 W. Esplanade Ave. Suite C %= Department of Conservation p Agriculture Service San Jacinto, CA 92383 . (714) 654-7733 March 21, 1990 Dean Williams 5 17 57 Park Place Pt. Richmond, CA 94801 Dear Mr. Williams: The following map symbols represent hydric soils in Orange County, California. 122 - Bolsa silt loam 139 - Chino silty clay loam 146 - Corralitos loamy sand 147 - Corralitos loamy sand, moderately fine substratures 191 - Riverwash 197 - Soboba gravelly loamy sand,"0 to 5% slopes 198 - Soboba cobbl*5 loamy sand, 0 to I5/ dopes 210 - Thapto-Histic Fluvaquents 211 - Tidal flats The numbers correspond to the soil map units in the Orange County soil survey report and soils maps. If I can be of any further assistance, please contact me at 714-654-7733. Sincerely, Wc�- District Conservationist 6 The Sod Conservation Service is an agency o! me peoartment of Agriculture 22 SOIL SURVEY eroded. It is only 5 to 15 inches deep over bedrock. In many places it is cut by gullies and intermittent drain- age channels. Geologic erosion is active, and small landslips are common. Surface cobbles and stones are numerous in some areas. About 5 percent of this mapping unit is included areas of San Andreas sandy loam; 5 percent Soper cobbey loam; 5 percent Calleguas clay loam; 10 per- cent an uneroded Cieneba sandy loam in the coastal foothill area; 6 percent Vista coarse sandy loam; 4 percent Tollhouse -Rock outcrop complex; and 3 percent Blasingame loam, in the Santa Ana Mountain area. If the soil is bare, runoff is rapid and the erosion hazard is high. Available water capacity is 0.75 to 2.5 inches. The effective rooting depth is 5 to 15 inches. Present land use is limited to range, watershed, and wildlife habitat. Capability unit VIIe-1 (19) ; Shallow Loamy range site; Storie index 7. 143—Cieneba-Blasingame-Rock outcrop complex, 9 to 30 percent slopes. This strongly sloping to moder- ately steep mapping unit is about 35 percent Cieneba_ sandy loam, 30 percent Blasingame loam, and 25 per- cent Rock outcrop and large boulders. The Cieneba soil and Rock outcrop generally occur on ridgetops and on south- and west -facing side slopes. The Blasingame soil and Rock outcrop generally occur on north- and east -facing side slopes. About 10 percent of this map- ping unit is included areas of Vista coarse sandy loam. In Cieneba sandy loam, available water capacity is 2.0 to 3.0 inches and the effective rooting depth is 15 to 19 inches. In Blasingame loam, available water capac- ity is 2.5 to 4.0 inches and the effective rooting depth is 20 to 30 inches. Rock outcrop is granodiorite outcrop or boulders. If the soil is bare, runoff is rapid and the erosion hazard is high. Present land use is limited to range, wildlife habitat, and watershed. Capability unit VIs-1 (19) ; Shallow Loamy -Rock outcrop complex range site, Storie index 17 (according to the proportion of dominant soils) . 144—Cieneba-Rock outcrop complex, 9 to 30 percent slopes. This strongly sloping to moderately steep map- ping unit commonly occurs on broad mountain ridge - tops and side slopes in the Santa Ana Mountains. It is 30 percent granodiorite outcrop and boulders. About 7 percent of this mapping unit is included areas of Vista coarse sandy loam; 4 percent Tollhouse soils; and 3 percent Blasingame loam. If the soil is bare, runoff is rapid and the erosion hazard is high. The Cieneba soil has an available water capacity of 2.0 to 3.0 inches. For most plants it has an effective rooting depth of 15 to 19 inches. Some brush roots penetrate deeper into the weathered bedrock. Present land use is limited to range, watershed, and wildlife habitat. Capability unit VIs-1 (19) ; Shallow Loamy=R.ock outcrop complex range site; Storie in- dex 14. 145—Cieneba-Rock outcrop complex, 30 to 75 per- cent slopes. This steep to very steep mapping unit oc- curs on hillsides or mountainsides. In the Santa Ana Mountain area, it is about 30 percent granodiorite outcrop and boulders. In coastal foothill areas, it is 10 to 35 percent sandstone outcrop. About 5 percent of this mapping unit is included areas of Vista coarse sandy loam; 5 percent Tollhouse soil in the Santa Ana Mountain area; 5 percent San Andreas sandy loam; and 5 percent Anaheim loam in the coastal foothills. If the soil is bare, runoff is rapid and the erosion hazard is high. Cieneba sandy loam has an available water capacity of 0.75 to 2.5 inches. For most plants it has an effective rooting depth of 5 to 15 inches. Some brush roots penetrate deeper into the weathered bed- rock. Present land use is limited to range, watershed, and wildlife habitat. Capability unit, Cieneba soil, VIIs-1 (19) ; Shallow Loamy -Rock outcrop complex range site; Storie index 4. Corralitos Series The Corralitos series consists: of somewhat exces- sively drained soils on fans in long, narrow valleys. These soils formed in mixed coarse textured alluvium. Slopes are 0 to 5 percent. Elevation ranges from 50 to 1,500 feet. The vegetation is mainly annual grasses and forbs and some trees and brush generally near stream channels. Precipitation is 12 to 20 inches, and the mean annual air temperature is about 62° F. The frost -free season is 230 to 300 days. Typically, the surface layer is grayish brown loamy sand and loamy fine sand 9 inches thick. The underly- ing material is stratified light brownish gray and light gray loam* coarse sand, sand, and loamy fine sand to a depth of 60 inches or more. The soil is medium acid throughout. It is rapidly permeable. Corralitos soils ' are used for citrus, irrigated row crops, pasture, and range. Typical profile of Corralitos loamy sand, on the Rancho Mission Viejo; Orange County, about 400 feet east of the Ortega Highway bridge (which is 2.4 miles east of San Juan Capistrano) and 100 feet north of the highway, SIA7111NWI/,�, see. 33, T. 7 S., R. 7 W., SBB&M. A11-0 to 2 inches; grayish brown (10YR 5/2) loamy sand, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; few fine pores; medium acid; abrupt smooth boundary. •Al2-2 to 9 inches; grayish brown (10YR 5/2) loamy fine sand, dark gray (10YR 4/2) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine pores; medium acid; clear smooth boundary. Cl-9 to 21 inches; light brownish gray (10YR 6/2) loamy coarse sand, dark gray (10YR 4/1) moist; single grained; loose, nonsticky and nonplastic; medium acid; o adual smooth boundary. C2-21 to 32 inches; light gray (10YR 6/1) gray (10YR 5/1) ane light brownish gray (10YR 6/2) sand, gray (10YR 5/1) and dark gray (10YR 4/1) moist; single grained; loose, nonsticky and nonplastic; medium acid; abrupt smooth boundary. C3-32 to 35 inches; light brownish gray (10YR 6/2) loamy fine sand, dark gray _ .(10YR 1 ORANGE COUNTY, CALIFORNIA 23 4/1) moist; massive; soft, very friable, nonsticky and nonelastic; medium acid; abrupt wavy boundary. C4-35 to 60 inches; light brownish gray (10YR 6/2) sand, gray (10YR 5/1) moist; sin- gle grained; loose, nonsticky and non - plastic; medium acid. The A horizon ranges from grayish brown to brown or pale brown to light brownish gray in 10YR hue. Texture is sand, loamy sand, or loamy fine sand. Struc- ture may be granular, but in many places the soil is massive or single grained. Dry consistence ranges from loose to soft or slightly hard. Thickness ranges from 9 to 20 inches. The C horizon ranges from pale brown, light brown- ish gray, and very pale brown to light gray in 10YR hue. Texture is generally sand, loamy sand, loamy coarse sand, or loamy fine sand. In places the soil is stratified. Reaction ranges from medium acid to neu- tral. In some soils the underlying material is of contrast- ing texture. Color ranges from dark gray to light brownish gray. Texture is silt loam or silty clay loam. Thickness is 2 to 6 inches or more. Depth to such strata is generally 40 to 60 inches. 146—Corralitos loamy sand. This nearly level to gently sloping soil generally occurs as long narrow areas along stream channels. It has the profile de- scribed as typical of the series. About 2 percent of this mapping unit is included areas of Capistrano sandy loam; 4 percent Metz loamy sand; 3 percent Soboba gravelly loamy sand, 0 to 5 percent slopes; 5 percent Riverwash; and 20 percent Corralitos soils that have a very fine sandy loam over - wash 4 to 10 inches thick. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 4.0 to 5.5 inches. The effective rooting depth is 60 inches or more. Present land use is irrigated row crops, citrus, pas- ture, and range. Capability unit IIIs-4 (19) ; Sandy range site; Storie index 68. 147—Corralitos loamy sand, moderately fine sub. stratum. This nearly level to gently sloping soil gener- ally occurs as long narrow areas along stream channels. The profile is similar to the one described as typical. of the series, but there is a silt loam or silty clay loam layer 2 to 6 inches thick at a depth of 36 to 60 inches. About 10 percent of this mapping unit is included areas of Corralitos loamy sand; 3 percent Corralitos soils that have a very fine sandy loam overwash ; 2 per- cent Capistrano sandy loam; 2 percent Riverwash; and 5 percent Metz loamy sand, moderately fine sub- stratum. Permeability is rapid in the upper 40 inches and slow in the moderately fine underlying stratum. An in- termittent water table is perched just above the finer textured stratum if rainfall is above normal or if the soils are overirrigated. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 5.5 to 6.0 inches. The effective rooting depth is 60 inches or more. Present land use is irrigated row crops, citrus, pas- ture, and range. Capability unit IIs-4 (19) ; Sandy range site; Storie index 65. Cropley Series The Cropley series consists of well drained soils on fans and valley fill. These soils formed in fine textured alluvium derived from sedimentary rocks. Slopes are 0 to 9 percent. Elevation ranges from 50 to 1,000 feet. The vegetation is annual grasses and forbs. Precipita- tion is 10 to 20 inches, and the mean annual air tem- perature is about 621 F. The frost -free season is 280 to 340 days. Typically, the surface layer is very dark gray clay 29 inches thick. The underlying material is dark gray clay to a depth of 60 inches or more. The soil is mildly alkaline in the surface layer and moderately alkaline and slightly calcareous in the subsurface layer. The underlying material is moderately alkaline, has segre- gated lime, and increases from slightly calcareous to violently calcareous with increasing depth. The soil is slowly permeable. Available water ca- pacity is 8.0 to 10.0 inches. The effective rooting depth is 60 inches or more. Cropley soils are used for dryland small grain, pas- ture, range, citrus, and urban development. Typical profile of Cropley clay, 2 to 9 percent slopes, in Oso Creek Valley, about 3.0 miles southeast of El Toro, Orange County, NW1/.1SW1/4, sec. 20, T. 6 S., R. 7 W. SBB&M. Ap-0 to 3 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; moderate fine and medium granular structure; hard, firm, very sticky and plastic; few very fine roots; few very fine and fine tubular pores; mildly alkaline; abrupt smooth boundary. Al2-3 to 15 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; strong very coarse prismatic structure parting to moderate medium and coarse angular blocky; extremely hard, firm, very sticky and plastic; common very fine and few fine roots; common very fine tubular pores; slightly effervescent; moderately alkaline; clear smooth boundary. A13-15 to 29 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; moderate medium and coarse angular blocky structure; extremely hard, firm, very sticky and plastic; common very fine and few fine roots; common very fine tubular pores; few small slicken- sides ; slightly effervescent; moderately alkaline; gradual smooth boundary. C1-29 to 38 inches; dark gray (10YR 4/1) clay, very dark grayish brown (10YR 3/2) moist; moderate medium and coarse an- gular blocky structure; extremely hard, firm, very sticky and plastic; few very fine roots; few very fine tubular pores; common small intersecting slickensides ; slightly effervescent; lime in filaments and soft masses; moderately alkaline; gradual smooth boundary. iLJ i I 1 i 1 1 1 i i 1 2 20 C2m-32 inches; silica cemented hardpan; com- mon medium and coarse horizontal roots along the upper boundary; very difficult to cut with hand tools. The Al horizon ranges from brown to very pale brown in 10YR hue. Texture is loamy sand or sandy loam. Dry consistence ranges from soft to hard. Re- action is strongly acid to medium acid. Thickness ranges from 10 to 19 inches. Some profiles lack the thin A2 horizon. There are no iron concretions in the A horizon. A few t/s to 1/z inch in size occur at the surface in this area. The B2t horizon is brown, grayish brown, or yellow- ish brown in 10YR or 7.5YR hue. In places it is mottled with brownish yellow, yellowish red, gray, or red. Texture is heavy clay loam or .sandy clay. In places the prismatic structure parts to angular blocky. Reaction .is strongly acid to medium acid. Thickness ranges from 10 to 18 inches. The thin C1 horizon is discontinuous. Depth to the white to reddish brown Cm•horizon is 20 to 37 inches. The Chesterton soils in this area do not have the concretions typical of the series as recognized else- where in California. 137—Chesterton loamy sand, 2 to 15 percent slopes. This gently sloping to strongly sloping soil is generally on undulating terracelike tappings of hills within a few miles of the coast. It has the profile described as typical of the series. About 5 percent of this mapping unit is included areas of Chesterton soils, 0 to 2 percent.slopes; 5 per- cent Marina loamy sand; 5 percent Myford sandy loans; and 5 percent soils that are 10 to 20 inches deep over a silica hardpan and do not have a sandy clay subsoil but are otherwise similar to this Chesterton soil. If the soil is bare, runoff is medium and the erosion hazard is high. Present land use is range, wa. tershed, and urban de- velopment. Capability unit VIe-1 (19) ; Claypan range site; Storie index 21. 138=Chesterton loamy sand, 15 to 30 percent slopes. This moderately steep soil generally occurs at the edges of terracelike tappings on hills within a few miles of the coast. About 10 percent of this mapping unit is included -areas of less sloping or steeper soils; 4 percent Marina loamy sand;.4 percent Myford sandy loam; and 5 per- cent soils that are 10 to 20 inches deep over a silica hardpan and do not have a sandy clay subsoil but are otherwise similar to. this Chesterton ,soil. If the soil is bare, runoff ,is rapid and the erosion hazard is high. Present land use is range, watershed', and some urban development. Capability unit VIe-1 (19) ; Claypan range site; Storie index 15. Chino Series The Chino series consists of somewhat poorly drained soils -on -alluvial fans. These soils formed in sedimen- tary. alluvium. Slopes are 0 to 2 percent. Elevation ranges from 5 to 200 feet. The vegetation is annual grasses and forbs. Precipitation is 12 to 15 inches, and SOIL SURVEY the mean annual air temperature is about 61' F. The frost -free season is 300 to 350 days. Typically, the surface layer is gray silty clay loam 24 inches thick. The underlying material is grayish brown, gray, and light gray silty clay loam in places -mottled with light brownish gray. It is 23 inches thick over light gray sandy clay loam, which extends to a depth of 60 inches or, more. The soil is moderately alkaline and calcareous throughout. It is moderately slowly permeable. Avail- able water capacity is 9.5 to 13.0 inches. Chino soils are used for row crops, field crops, and urban development. Typical profileof Chino Clsec. 45ty clay (by private loam, sury )the Irvine Ranch, N r /4,S in Orange County: Apl , 0 to 3 inches; gray (10YR .5/1) silty clay loam, very dark gray (10YR 3/1) moist; weak fine granular structure; hard, fri- able, sticky and, plastic; common very fine roots; common very -fine and fine tubular pores; violently effervescent; disseminated lime throughout; moder- ately alkaline; abrupt smooth boundary. Ap2-3 to 13 inches; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1.) moist; weak medium angular and sub - angular blocky structure; hard, fri- able, sticky and plastic; very few fine and common very fine roots ; common very fine and fine tubular pores; violently effervescent; d-isseminated lime through- out; moderately alkaline; abrupt smooth boundary. A13-13 to 24 inches; gray (10Y1R 5/1) silty clay loam, very dark gray (10YR 3/1) moist, with light brownish gray (2.5Y 6/2) mottles, dark grayish brown (2.5Y 4/2) moist; weak medium angular .and sub - angular blocky structure; -hard, friable, stick y and plastic; very few fine and com- mon very fine roots; very few medium and common very fine and fine tubular pores; violently effervescent ; dissemi- nated lime throughout; moderately alka- line; clear smooth boundary. C1-24 to 29 inches; grayish brown (2.5Y 5/2) silty clay loam, very dark grayish brown (2.5Y 3/2.) moist, with light brownish gray (2.5Y 6/2) mottles, .dark grayish brown (2.5Y 4/2) moist; massive; hard, friable,- sticky and plastic; common very fine roots; few fine and common very. fine tubular pores ; violently efferves- cent; disseminated and medium sized filaments of lime,throughout; moderately alkaline; clear smooth boundary. C2-29 to 37 inches; gray (10YR 6%1,)' silty clay loam, dark gray (10YR 4/1) moist; massive; hard, friable, sticky and plas- tic; few very fine roots; common very fine and fine tubular pores; violently ef- fervescent,; disseminated -lime through- out; moderately alkaline abrupt smooth boundary. T ORANGE COUNTY, CALIFORNIA C3-37 to 47 inches; light gray (10YR 7/1) silty clay loam, gray (10YR 5/1) moist; mas- sive; hard, firm, sticky and plastic; very few very fine roots; common very fine tubular pores; violently effervescent; disseminated lime throughout; moder- ately alkaline; clear smooth boundary. C4-47 to 60 inches; light gray (10YR 6/1 and 2.5Y 7/2) sandy clay loam, dark gray (10YR 4/1) and dark grayish brown (2.5Y 4/2) moist; massive; hard, fri- able, sticky and plastic; common very fine and fine tubular pores; violently ef- fervescent; disseminated lime; moder- ately alkaline. The A horizon ranges from gray to grayish brown in 10YR hue. Texture is silt loam or silty clay loam. Thickness ranges from 10 to 25 inches. The C horizon ranges from dark gray, gray, and light gray to light brownish gray in 10YR and 2.5Y hue. Texture is loam, silt loans, clay loam, sandy clay loam, or silty clay loam. The soil is moderately alkaline and calcareous throughout and may be slightly saline -alkali. Natural drainage is somewhat poor, and the water table is within a depth of 40 inches. Many areas, however, have been drained and the water table is at a depth of 60 inches or more. 139—Chino silty clay loam. This nearly level soil generally occurs on large alluvial fans. About 10 percent of this mapping unit is included areas of Bolsa silty clay loam; 5 percent Omni clay; and 2 percent Tidal fiats. Depth to a seasonal water table is 42 to 60 inches. Runoff is very slow, and the erosion hazard is none to slight. Drainage has not been altered. The effective rooting depth of most crops is 60 inches or more. Present land use is row crops, field crops, and urban development. Capability unit IIw-2 (19) ; range site not assigned; Storie index 72. 140—Chino silty clay loam, drained. This nearly level soil generally occurs on large alluvial fans. It has the profile described as typical of the series. About 10 percent of this mapping unit is included areas of Bolsa silty clay loam, drained; 5 percent Omni clay; 2 percent Mocho loam; and 2 percent Sorrento clay loam. If the soil is bare, runoff is slow and the erosion hazard is slight. This soil is drained, and the water table is more than 60 inches below the surface. The effective rooting depth is 60 inches or more. Present land use is row crops, field crops, and urban development. Capability unit I (19) ; range site not assigned; Storie index 81. Cieneba Series The Cieneba series consists of somewhat excessively drained soils. These soils formed in material weathered from granitic rocks of the Santa Ana Mountains and from the sandstone of the coastal foothills. Slopes are 9 to 75 percent. Elevation ranges from 200 to 4,000 feet. The vegetation is mostly brush. Precipitation is 14 to 25 inches, and the mean average air temperature is 59 to 62' F. The frost -free season is 200 to 340 days. VA Typically, the surface layer is light brownish gra and pale brown sandy loam 7 inches thick. The under lying material is weathered granodiorite. The soil is medium acid throughout. It is moderate] rapidly permeable. Cieneba soils are used mainly for watershed an wildlife habitat and to a limited extent for range. Typical profile of Cieneba sandy loam, in an are of Cieneba-Rock outcrop complex, 15 to 30 percei slopes, in the Trabuco Ranger District, Cleveland N: tional Forest (North), Orange County, about 800 fey south of the junction of the Main Divide Road at Horsethief Trail, SW1/t,SWt/4 sec. 36, T. 5 S., R. 6 N� SBB&M. A11-0 to 1 inch; light brownish gray (10YR 6/� sandy loam, dark grayish brown (10Y 4/2) moist; weak thin and medium plat structure; soft, very friable, nonsticl and nonelastic; common very fine root common very fine interstitial pores; m dium acid; clear smooth boundary. Al2-1 to 7 inches; pale brown (10YR 6/3) sanc loam, brown (10YR 4/3) moist; ma sive; slightly hard, very friable, no sticky and nonplastic; common very fi; and medium roots; few medium tubul, pores, few fine and medium interstiti pores; medium acid; abrupt smoo boundary. Cr-7 to 20 inches; ,yellow, light brownish gra white, and black weathered granodiorit massive; hard to very hard; few roots upper few inches; medium acid; grad into hard granodiorite at an undetc mined depth below 20 inches. The A horizon ranges from grayish brown, lig brownish gray, or pale brown to yellowish brown 10YR hue. Texture is fine gravelly sandy loam, coax sandy loam, or sandy loam. Structure is generally gra ular or the soil is massive except for a platy crust some areas. Dry consistence ranges from soft to hai Thickness ranges from 5 to 19 inches. The Cr horizon is weathered granodiorite of t Santa Ana Mountains area and soft sandstone of oth coastal foothill areas. Reaction ranges from medium acid to neuti throughout. 141—Cieneba sandy loam, 15 to 30 percent slop, This moderately steep soil generally occurs on or ne ridgetops. It is only 15 to 19 inches deep over weal ered bedrock. About 5 percent of this mapping unit is incluc areas of San Andreas sandy loam; 5 percent Anahe loam; and 3 percent Soper gravelly loam. If the soil is bare, runoff is rapid and the erosi hazard is high. Available water capacity is 2.0 to inches. The effective rooting depth is 15 to 19 inch but some brush roots penetrate deeper into the wea- eyed granite or along cracks in the sandstone. Present land use is pasture, range, and urban velopment. Capability unit VIe-1 (19) ; Shallow Loai range site; Storie index 23. 142—Cicneba sandy loam, 30 to 75 percent slop eroded. This steep to very steep soil has a profile simi to the one described as typical of the series, but it 1 11 1 1 i 1 L r-ii 1 I 1 1 i I 1 1 i 1 Ll 1 ORANGE COUNTY, CALIFORNIA 13 ridgetops. It has the profile described as typical of the series'. About 1-0 percent of this mapping unit is included areas of Blasingame stony loam, 9 to 30 percent slopes; 5. percent Las Posas gravelly loam, 15 to 50 percent slopes; 5 ,percent Vista coarse sandy loam; and 5 per- cent Ramona fine sandy loam. If the soil is bare, runoff is medium and the erosion 'hazard is moderate to high. Available water capacity is 3.5 to 6.5 inches. The effective rooting depth is 24 to 36 inches. Present land use. is range, watershed, and wildlife. Capability unit IVe-1 (19) ; Loamy range site; Storie index .39. 117—Blasin-acne stony loam, 9 to 30 percent slopes. This strongly sloping to moderately steep soil generally occurs on the gentler, lower mountain ridgetops. The profile is similar to the one described as typical of the series, but it is stony throughout. About 5 percent of this mapping unit is included areas of Blasingame loam, 9 to 30 percent slopes; 5 per- cent Las Posas gravelly loam, 15 to 50 percent slopes; and 5 percent Friant fine sandy loam. If the soil is bare, runoff is medium and the erosion hazard is moderate to high. Available water capacity is 3.0 to 5.0 inches. The effective rooting depth is 24 to 32 inches. Present land use is range, watershed, and wildlife. Capability unit VIs-1 (19) ; Loamy range site; Storie index 27. 118--Blasingame stony loam, 30 to 65 percent slopes. This steep to very steep soil generally occurs on lower mountainsides. The profile is similar to the one de- scribed as typical of the series, but it is stony through- out and is slightly shallower. About 5 percent of this mapping unit is included areas of Exchequer -Rock outcrop complex and 5 per- cent Friant fine sandy loam. If the soil is bare, runoff is medium and the erosion hazard is moderate to high. Available water capacity is 2.5 to 4.5 inches. The effective rooting depth is 20 to 32 inches. Present land use is range, watershed, and wildlife. Capability unit VIIs-1 (19) ; Loamy range site; Storie index 11. 119—Blasingame-Rock outcrop complex, 9 to 30 per- cent slopes.. This rolling complex occurs on lower moun- tain ridgetops. The Blasingame soil- has a profile simi- lar to the ,one described as typical of the series, but it is slightly shallower. About 20 to 35 percent of the surface is large granitic boulders or Rock outcrop, or both. About 10 percent of this complex is included areas Of Vista=Rock outcrop complex; 5 percent Cieneba- Rock outcrop, 9 to 30 percent slopes; and 10 percent less sloping or steeper Blasingame-Rock outcrop. If the soil is bare, runoff is medium to rapid and the erosion hazard is high. Available water capacity is 3.0 to 5..0 inches. The effective rooting depth is 24 to 32 inches. Present land use is range and watershed. Capability unit for VIs-1 (19) ; Loamy -Rock outcrop complex range site; Storie index 20. 120—Blasingame-Vista complex, 9 to 15 percent slopes. This strongly sloping mapping unit is about 50 percent Blasingame loam, 9 to 15 percent slopes, and 40 percent Vista coarse sandy :loam, 9 to 15 percent slopes. The Blasingame loam is on north- and east - facing slopes and in swales. Vista coarse sandy loam is on ridgetops and south- and west -facing slopes. About 6 percent of this complex is included areas of Cieneba sandy loam, 4 percent Las Posas gravelly loam, and 5 percent less sloping or steeper soils. Both soils have the profiles described as typical_ of the respective series. The Blasingame soil has an effec- tive rooting depth' of 24 to 36 inches and an available water capacity. of 3:5 to 6.5 inches. The Vista soil has an effective rooting depth of 30 to 40 inches and an available water -capacity of 3.0 to 5.0 inches. Runoff is medium on both soils, and the erosion hazard is mod- erate to high. This unit is used for range and watershed. Capa- bility unit IVe-1 (19) ; Loamy range site; Storie index 51 (according to the proportion of dominant soils). 121—Blasingame-Vista complex, 15 to 30 percent slopes. This moderately steep mapping unit is about 50 .percent Blasingameloam and 40 percent Vista coarse sandy loam. The Blasingame loam is on north- and east -facing side slopes and in swales. The Vista coarse sandy loam is on ridgetops and south- and west -facing side slopes. About 5 percent of this mapping -unit is included areas of Cieneba sandy loam; about 5 percent Las Posas gravelly loam, and 10 percent less sloping or steeper soils. -Both soils have the profiles described as typical of the respective series. The Blasingame soil has an effec- tive rooting depth of 24 to 32 inches- and an available water capacity of 3:5 to 6.0 inches. The Vista soil has an effective rooting depth of 24 to 40 inches and an available water capacity of 2.5 to 5.0 inches. On both soils, runoff is medium and the erosion hazard is mod- erate to high. Present land use _is range and watershed. Capability unit VIe-1 (19) ; Loamy range site; Storie index 36 (according to the proportion of dominant soils). Bolsa Series The Bolsa series consists of somewhat poorly drained soils on alluvial fans. These soils formed in mixed alluvium. Slopes are 0 to 2 percent. Elevation ranges from 5 to 300 feet. The vegetation is annual grasses and forbs. Precipitation is 12 to 15 inches, and the mean annual air temperature is about 620 F. The frost -free season is 300 to 350 days. Typically, the surface layer is light brownish gray silt loam 12 inches thick. The upper 17 inches of under- lying material is light brownish gray silt loam with some very faint mottles. It is light brownish gray silty clay loam with common reddish yellow mottles to a depth of 65 inches or more. 1. The soil is moderately alkaline throughout and cal- careous to a depth of 49 inches. It is moderately slowly permeable. Bolsa soils are used for row crops, field, crops, and urban development.. Typical profile of Bolsa silt loam, in Huntington Beach, SE1/4SE1/.j sec. 12, T. 6 S., R. 7 W. Orange 14 SOIL SURVEY County, northwest corner of Magnolia and Atlanta Avenues: Apt-0 to 6 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR, 4/2) moist; weak medium sub - angular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; strongly effervescent; moderately alkaline; abrupt smooth boundary. Ap2-6 to 12 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak medium sub - angular blocky structure; hard, firm, slightly sticky and slightly plastic; few fine and common medium roots; common very fine tubular pores; strongly effer- vescent; moderately alkaline; clear smooth boundary. C1-12 to 18 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; few very faint mot- tles; weak medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few fine and common medium roots; common very fine tubular pores; strongly effervescent; moderately alkaline; clear smooth boundary. C2-18 to 29 inches; Iight brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak medium sub - angular blocky structure; hard, firm, slightly sticky and slightly plastic; few fine and common medium roots; common very fine tubular pores; strongly effer- vescent; moderately alkaline; abrupt smooth boundary. C3-29 to 39 inches; light brownish gray (10YR 6/2) light silty clay loam, dark grayish brown (10YR 4/2) moist; few fine prom- inent reddish yellow (7.5YR 6/6) mot- tles, strong brown (7.5YR 5/6) moist; creak fine and medium prismatic struc- ture; very hard, firm, sticky and plastic; few fine and common medium roots; common very fine tubular pores; salts in fine threads; strongly effervescent; mod- erately alkaline; clear smooth boundary. C4-39 to 49 inches; light brownish gray (2.5Y 6/2) silty clay loam, dark grayish brown (2.5Y 4/2) moist; common fine promi- nent reddish yellow (7.5YR 6/6) mot- tles, strong brown (7.5YR 5/6) moist; weak fine and medium prismatic struc- ture.; very hard, firm, sticky and plastic; few fine roots; common very fine and fine tubular pores; salts in fine threads; strongly effervescent; moderately alka- line; clear smooth boundary. C5-49 to 55 inches; light brownish gray (2.5Y 6/2) and dark gray (2.5Y 4/0) heavy silty clay loam, high in organic matter; dark grayish brown (2.5Y 4/2) and dark gray (2.5Y 4/0) moist; common fine prominent reddish yellow (7.5Y 1 1 6/6) mottles, strong brown (7.5Y 5/ moist; weak coarse prismatic structui very hard, very firm, very sticky a plastic; few fine and medium rool, many very fine and fine tubular por( moderately alkaline; clear smog boundary. C6-55 to 69 inches; light gray (2.5Y 7/2) sil clay loam, grayish brown (2.5Y 5/ moist; many fine prominent browni yellow (10YR 6/6) mottles, yelloNvi brown (10YR 5/6) moist; massive, Nvi thin strata; hard, firm, sticky and ph tic; common very fine pores; salts in fi threads; moderately alkaline. The A horizon ranges from light brownish gray grayish brown in 10YR hue. Texture ranges fr( sandy loam, silt loam, and loam to silty clay lo., Thickness ranges from 10 to 20 inches. The C horizon ranges from light gray, light bro%\ ish gray, pale brown, and grayish brown to dark gr in 10YR and 2.5Y hue. Texture, which is variable 1 cause of stratification, ranges from loamy sand heavy silty clay loam. The soils are calcareous to a depth of 40 inches more. Natural drainage is somewhat poor. Many are. however, are now drained and the water table is belt 60 inches. 122—Bolsa silt loam. This nearly level soil genera'• occurs on large alluvial fans. About 10 percent of this mapping unit is includ areas of Chino silty clay loam; 10 percent Huenei fine sandy loam; 2 percent Omni silt loam, drained: percent Tidal flats; and 10 percent soils that have sandy loam overwash but are otherwise similar to tl Bolsa soil. Runoff is very slow, and the erosion hazard is slig; A seasonal water table is at a depth of 36 to 72 inch, Available .rater capacity is 11.5 to 12.5 inches. T effective rooting depth is 60 inches or more. Present land use is row crops, field crops, and urb development. Capability unit IIw-2 (19) ; range s; not assigned; Storie index 76. 123—Bolsa silt loam, drained. This nearly level s: generally occurs on large alluvial fans. It has the p) file described as typical of the series. About 10 percent of this mapping unit is includ areas of Chino silty clay; 10 percent Hueneme fi- sandy loam; 2 percent Metz loamy sand; 2 perce San Emigdio fine sandy loam; 1 percent Omni s. loam, drained; and 2 percent soils that have a san, loam overwash but are otherwise similar to this Bol soil. If the soil is bare, runoff is slow and the erosit hazard is slight. The effective rooting depth is 60 inch or more. The available water capacity is 11.5 to 12 inches. Present land use is row crops, field crops, and urb: development. Capability unit I (19) ; range site not r signed; Storie index 85. 124—Bolsa silty clay loam. This nearly level s, generally occurs on large alluvial fans. The profile similar to the one described as typical of the series, b the texture is silty clay loam. About 5 percent of this mapping unit is includ 11 1 1 1 1 1 1 1 ORANGE COUNTY, CALIFORNIA, areas; of f Omni clay and 5 percent Chino silty -clay loam. Runoff is very slow, and the erosion hazard is none to slight. The water table is at a depth of 36 to 72 inches. Available water capacity is 11.5 to 12.5 inches. The effective rooting depth is 60 inches or more. Present land use is row crops, field crops, and urban development. Capability unit IIw-2 (19) ; range site not assigned; Storie index 68. 125--Bolsa silty clay loamy drained. This nearly level soil generally occurs on large alluvial fans. The profile is similar to the one described as typical .of the series, but the texture is silty clay loam. About 10 percent of this mapping unit is included areas of Chino silty clay loam, 3 percent Hueneme fine sandy loam, and 3 percent Omni clay. Runoff is slow, and the erosion hazard is slight. Available water capacity is 11.5 to 12.5 inches. The effective rooting depth is 60 inches or more. Present land use is row crops, field crops, and urban development. Capability unit I (19) ; range site not assigned; Storie index.77. Bosanko Series The Bosanko series consists of well drained soils on foothills. These soils formed in material weathered n Figure I: —Profile of Bosanko clay, 9 to 15 percent slopes. 15 from calcareous shale, sandstone, or weakly consoli- dated sediments. Slopes are 9 to 50 percent. Elevation ranges from 200 to 2,500 feet. The vegetation is an- nual_ grasses, mustard, .and -other for-bs. Precipitation is 12 to 20 inches, and the mean annual air tempera- ture is about 611 F. The frost -free season is 300 to 350 days. Typically, the surface layer is dark gray clay 25 inches thick. The next layer is calcareous mixed dark gray clay and pale yellow weathered shale 12 inches thick. The bedrock is pale yellow and,light brownish gray weathered shale (fig. 1). The soil is mildly .alkaline in the upper 12 inches and moderately alkaline below. It is slowly permeable. Bosanko soils are used, for dryland small grain, pas- ture, range, citrus, and urban development. Typical profile of Bosanko, clay, 9 to 15 percent slopes, NWI/ISE1/4 sec. 20, T. 6 S., R. 7W., SBB&M; east of Oso Creek and about 1,600 feet southwest of Triangulation Point 1128: Ap-0.to 2 inches,; dark -gray (10YR 4/1) clay, black (10YR 2/1) moist; strong fine and medium granular structure; very hard, firm, very sticky and very plastic; com- mon very fine roots; many fine and me- dium interstitial pores; mildly alkaline.; abrupt smooth boundary: Al2-2 to 12 inches; dark gray (10YR, 4/1) clay, black (10YR 2/1) moist; strong very coarse prismatic structure; extremely hard, firm, very sticky and very plastic; common very fine roots; common very fine tubular pores; . mildly alkaline; gradual smooth boundary. A13-12 to 25. inches; dark . gray (10YR 4/1) clay, black (10YR 2-/1) .moist; moderate very coarse prismatic structure; ex- tremely hard, firm, very sticky and very plastic; few very fine roots; many very fine tubular pores; common fine and me- dium intersecting slickensides ; moder- ately alkaline:; gradual wavy boundary. AC6a-25 to 37 inches; dark gray (10YR 4/1) clay and pale yellow (5Y 7/3) weath- ered shale, black (10YR. 2/1) and olive (5Y 5/3) moist; moderate very coarse prismatic structure; very hard, firm, very sticky and very plastic; strongly effervescent; fine lime filaments and soft masses; moderately alkaline; clear smootli boundary.. Crl-37 to 47 inches; .pale yellow (5Y 7/3) weathered shale, olive (5Y 5/3) moist; very few very fine roots on fractures; lime coatings along fractures; common vertical and horizontal deposits of gyp- sum 1/l. to- 1 inch wide; moderately alka- line.; gradual irregular boundary. Cr2-47 to 79 inches; light brownish gray (2.5Y 6/2) weathered shale, grayish brown (2.5Y 5/2) moist; lime coatings along fractures; common vertical- and horizon- tal deposits of gypsum 1/1. to 1 inch wide; moderately _alkaline. The A horizon ranges from dark gray to gray in PEI M ORANGE COUNTY, CALIFORNIA 4/1) moist; massive; soft, very friable, nonsticky and nonelastic; medium acid; abrupt wavy boundary. C4-35 to 60 inches; light brownish gray (10YR 6/2) sand, gray (10YR 5/1) moist; sin- gle grained; loose, nonsticky and non - plastic; medium acid. The A horizon ranges from grayish brown to brown or pale brown to light brownish gray in 10YR hue. Texture is sand, loamy sand, or loamy fine sand. Struc- ture may be granular, but in many places the soil is massive or single grained. Dry consistence ranges from loose to soft or slightly hard. Thickness ranges from 9 to 20 inches. The C horizon ranges from pale brown, light brown- ish gray, and very pale brown to light gray in 10YR hue. Texture is generally sand, loamy sand, loamy coarse sand, or loamy fine sand. In places the soil is stratified. Reaction ranges from medium acid to neu- tral. In some soils the underlying material is of contrast- ing texture. Color ranges from dark gray to light brownish gray. Texture is silt loam or silty clay loam. Thickness is 2 to 6 inches or more. Depth to such strata is generally 40 to 60 inches. 146—Corralitos loamy sand. This nearly level to gently sloping soil generally occurs as long narrow areas along stream channels. It has the profile de- scribed as typical of the series. About 2 percent of this mapping unit is included areas of Capistrano sandy loam; 4 percent Metz loamy sand; 3 percent Soboba gravelly loamy sand, 0 to 5 Percent slopes; 5 percent Riverwash ; and 20 percent Corralitos soils that have a very fine sandy loam over - wash 4 to 10 inches thick. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 4.0 to 5.5 inches. The effective rooting depth is 60 inches or more. Present land use is irrigated row crops, citrus, pas- ture, and range. Capability unit IIIs-4 (19) ; Sandy range site; Storie index 68. 147—Corralitos loamy sand, moderately fine sub- stratum. This nearly level to gently sloping soil gener- ally occurs as long narrow areas along stream channels. The profile is similar to the one described as typical of the series, but there is a silt loam or silty clay loam layer 2 to 6 inches thick at a depth of 36 to 60 inches. About 10 percent of this mapping unit is included areas of Corralitos loamy sand; 3 percent Corralitos soils that have a very fine -sandy loam overwash ; 2 per- cent Capistrano sandy loam; 2 percent Riverwash; and 5 percent Metz loamy sand, moderately fine sub- stratum. Permeability is rapid in the upper 40 inches and slow in the moderately fine underlying stratum. An in- termittent water table is perched just above the finer textured stratum if rainfall is above normal or if the soils are overirrigated. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 5.5 to 6.0 inches. The effective rooting depth is 60 inches or more. Present land use is irrigated row crops, citrus, pas- ture, and range. Capability unit IIs-4 (19) ; Sandy range site; Storie index 65. Cropley Series The Cropley series consists of well drained soils on fans and valley fill. These soils formed in fine textured alluvium derived from sedimentary rocks. Slopes are 0 to 9 percent. Elevation ranges from 50 to 1,000 feet. The vegetation is annual grasses and forbs. Precipita- tion is 10 to 20 inches, and the mean annual air tem- perature is about 621 F. The frost -free season is 280 to 340 days. Typically, the surface layer is very dark gray clay 29 inches thick. The underlying material is dark gray clay to a depth of 60 inches or more. The soil is mildly alkaline in the surface layer and moderately alkaline and slightly calcareous in the subsurface layer. The underlying material is moderately alkaline, has segre- gated lime, and increases from slightly calcareous to violently calcareous with increasing depth. The soil is slowly permeable. Available water ca- pacity is 8.0 to 10.0 inches. The effective rooting depth is 60 inches or more. Cropley soils are used for dryland small grain, pas- ture, range, citrus, and urban development. Typical profile of Cropley clay, 2 to 9 percent slopes, in Oso Creek Valley, about 3.0 miles southeast of El Toro, Orange County, NW1/1SW1/1 sec. 20, T. 6 S., R. 7 W., SBB&M. Ap-0 to 3 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; moderate fine and medium granular structure; hard, firm, very sticky and plastic; few very fine roots; few very fine and fine tubular pores; mildly alkaline; abrupt smooth boundary. Al2-3 to 15 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; strong very coarse prismatic structure parting to moderate medium and coarse angular blocky; extremely hard, firm, very sticky and plastic; common very fine and few fine roots; common very fine tubular pores; slightly effervescent; moderately alkaline; clear smooth boundary. A13-15 to 29 inches; very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; moderate medium and coarse angular blocky structure; extremely hard, firm, very sticky and plastic; common very fine and few fine roots; common very fine tubular pores; few small slicken- sides; slightly effervescent; moderately alkaline; gradual smooth boundary. C1-29 to 38 inches; dark gray (10YR 4/1) clay, very dark grayish brown (10I'R 3/2) moist; moderate medium and coarse an- gular blocky structure; extremely hard, firm, very sticky and plastic; few very fine roots; few very fine tubular pores; common small intersecting slickensides ; slightly effervescent; lime in filaments and soft masses; moderately alkaline; gradual smooth boundary. 1 1 1 1 1 1 n 1 1 L 1 1 11 24 -1 1 1 1 1 1 i 1 i LI SOIL SURVEY C2-38 to 49 inches; dark gray (10YR 4/1) clay, very dark grayish. brown (10YR 3/2) moist; moderate medium angular blocky structure; very hard, firm, very sticky and plastic; very few very fine and fine roots; common very fine tubular pores; common small intersecting slickensides; violently effervescent; lime in filaments and soft masses; moderately alkaline; gradual irregular boundary. C3-49 to 65 inches; dark gray (10YR 4/1) .clay, very dark grayish brown (10YR 3/2) moist; moderate medium angular blocky structure; very hard, firm, very sticky and plastic; very few very fine and fine roots; common very fine tubular pores; common small intersecting slickensides ; violently effervescent; lime in filaments and soft masses; moderately alkaline. The A horizon ranges from dark gray to very dark gray in 10YR hue. Texture is heavy clay loam, silty clay, or clay. Structure ranges from granular to sub - angular blocky in the upper few inches. Reaction is neutral to moderately alkaline. The upper few inches is noncalcareous. In places the lower part is calcareous. Thickness ranges from 20 to 35 inches. The C horizon ranges from dark gray, dark grayish brown, brown to yellowish brown in 10YR and 2.5Y hue. ,Texture is clay, silty clay loam, or clay loam. Structure is typically angular blocky; in places this horizon is massive. Dry consistence is extremely hard to hard. The C horizon is calcareous with or without segregated lime. Intersecting slickensides occur in some parts of the profile. When dry, the soil has cracks 1 to 2 inches wide to a depth of 20, inches or more. 148—Cropley clay, 0 to 2 percent slopes. This nearly level soil generally occurs as irregular, oblong areas. About 10 percent of this mapping unit is included areas of a soil that is very dark grayish brown or dark grayish brown clay but is otherwise similar to this Cropley soil; 5 percent Omni clay, drained; 3 percent Chino silty clay loam, drained; and 5 percent Bosanko clay. If the soil is bare, runoff is slow and the erosion hazard is slight. Present land use is urban development and citrus. Capability unit Its-5 (19) ; Clayey range site; Storie index 54. 149—Croplev clay, 2 to 9 percent slopes. This gently sloping to moderately sloping soil generally occurs as irregular, oblong areas. It has the profile described as typical of the series. About 10 percent of this mapping unit is included areas of Cropley clay, 0 to 2 percent slopes; 10 percent a soil that is very dark grayish brown to dark grayish brown clay but is otherwise similar to this Cropley soil; 7 percent Bosanko clay; and 3 percent Botella clay loam, 2 to 9 percent slopes. If the soil is bare, runoff is medium and the erosion hazard is slight. Present land use is citrus, barley, pasture, range, and urban development. Capability unit IIe-5 (19) ; Clayey range site; Storie index 47. Escondido Series The Escondido series consists of well drained soils on uplands in the Santa Ana Mountains. These soils formed in material weathered from metamorphosed sandstone. Slopes are 9 to 30 percent. Elevation ranges from 1,000 to 3,500 feet. The vegetation is mostly an oak -grass type. Precipitation is 16 to 25 inches, and the mean annual air temperature is about 600 F. The frost -free season is 240 to 300 days. In a typical profile the surface layer is brown, slightly acid and medium acid very fine sandy loam 16 inches thick. The subsoil is light ,yellowish brown, medium acid very fine sandy loam 13 inches thick. Slightly weathered metamorphic sandstone is at a depth of 29 inches. The soil is moderately permeable. Available water capacity is 3.0 to 5.5 inches. The effective rooting depth is 24 to 35 inches. Escondido soils are used for pasture, range, water- shed, and wildlife. Typical profile of Escondido very fine sandy loam, 9 to 15 percent slopes, in the Trabuco Ranger District, Cleveland National Forest (north), NW1/IS«'I/4 sec. 18, T. 7 S., R. 5 W., SBB&M; about 50 feet west of the trail in Oak Flats: 01-1/2 inch to 0; litter of oak leaves; grass stems, small twigs, and tree branches. A11-0 to 3 inches;- brown (10YR 5/3) very fine sandy loam, dark yellowish brown (10YR 3/4) moist; weak fine and me- dium granular structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine and fine tubular pores; 5 percent small angular pebbles; slightly acid; abrupt smooth boundary. Al2-3 to 16 inches; brown (10YR 5/3) very fine sandy loam, dark yellowish brown (10YR 3/4) moist; weak fine and me- dium angular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common fine and medium tubular pores; 5 percent angular pebbles; medium acid; gradual wavy boundary. B2-16- to 29 inches; light yellowish brown (10YR 6/4) very fine sandy loam, few fine faint pinkish mottles, brown (10YR 4/3) moist; moderate medium and coarse subangular blocky structure; Bard, fri- able, slightly sticky and slightly plastic; few medium and coarse, -many very fine and fine roots; common very fine and fine tubular pores; 5 percent pebbles; medium acid; gradual wavy boundary. R-29 to 34 inches light yellowish brown (10YR 6/4), slightly vreathered metamorphosed sandstone, dark yellowish brown (10YR 4/4) moist. The A horizon ranges from brown to yellowish brown in 10YR and 7.5YR hue. Texture is fine sandy loam, very fine sandy loam, or silt loam. The soil may be massive in the lower part. Dry consistence is slightly 38 SOIL SURVEY urban development. Capability unit VIIe-1 (19) ; Clay - pan range site; Storie index 14. 178—Myford sandy loam, thick surface, 0 to 2 per. cent slopes. This nearly level soil generally occurs on broad terraces. The profile is similar to the one de- scribed as typical of the series, but the surface layer is about 10 inches thicker. About 10 percent of this mapping unit is included areas of Myford sandy loam, 0 to 2 percent slopes; 3 percent Capistrano sandy loam; 3 percent Chesterton loamy sand; 3 percent Yorba gravelly sandy loam; and 5 percent steeper sloping Myford soils. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 3.0 to 5.5 inches. The effective rooting depth is 20 to 30 inches for root -sensitive crops. For other crops it is 60 inches or more. Present land use is citrus, pasture, range, barley, and urban development. Capability unit IIIs-3 (19) ; Claypan range site; Storie index 60. 179—Myford sandy loam, thick surface, 2 to 9 per. cent slopes. This gently sloping to moderately sloping soil generally occurs on broad terraces. The profile is similar to the one described as typical of the series, but the surface layer is about 10 inches thicker. About 10 percent of this mapping unit is included areas of Myford sandy loam, 2 to 9 percent slopes; 3 percent Capistrano sandy loam; 3 percent Chesterton loamy sand, 2 to 9 percent slopes; 3 percent Yorba gravelly sandy loam, 2 to 9 percent slopes; and 7 per- cent steeper or more gently sloping Myford soils. If the soil is bare, runoff is medium and the erosion hazard is moderate. Available water capacity is 3.0 to 5.5 inches. The effective rooting depth is 20 to 30 inches for root -sensitive crops. For other crops it is 60 inches or more. Present land use is citrus, pasture, range, barley, and urban development. Capability unit IIIe-3 (19) ; Claypan range site; Storie index 54. Nacimiento Series The Nacimiento series consists of well drained soils on foothills. These soils formed in material weathered from soft sandstone or shale, or both. Slopes are 15 to 50 percent. Elevation ranges from 100 to 2,500 feet. The vegetation is sagebrush and in some areas an undercover of annual grasses. Precipitation is 12 to 20 inches, and the mean annual air temperature is about 62' F. The frost -free season is 300 to 350 days. In atypical profile the surface layer is brown clay loam 28 inches thick. The underlying material is light yellowish brown and very pale brown shale or sand- stone, or both. The soil is moderately alkaline and calcareous throughout. Permeability is moderately slow. The ef- fective rooting depth is 24 to 36 inches. Available water capacity is 4.0 to 7.0 inches. Nacimiento soils are used for pasture, range, and watershed. Typical profile of Nacimiento clay loam, 30 to 50 percent slopes, in Chino Hills, near a truck trail on a hill ridge, about 400 feet east of a power pole and about 1,000 feet north of Blue Mud Canyon, Rancho Santa Ana, Orange County, SW1/4NW1/4 sec. 20 (project T. 3 S., R. 8 W., SBB&M. A11-0 to 14 inches; brown (10YR 5/3 ) loam, dark brown (10YR 3/3) m moderate medium subangular bl structure; hard, friable, slightly 81 and plastic; many very fine and roots; many fine and medium tul pores; strongly effervescent; dist nated lime; moderately alkaline; smooth boundary. Al2ca-14 to 28 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) m weak medium subangular blocky s ture ; hard, friable, slightly sticky plastic; many very fine and fine r strongly effervescent; disseminated and in filaments; moderately alka clear wavy boundary. Cr-28 to 40 inches; light yellowish brown (1 6/4) and very pale brown (10YR. weathered shale and sandstone, yellc brown (10YR 5/4) and pale b; (10YR 6/3) moist; roots along fractures; lime coats rock fragn which are calcareous throughout. . The A horizon ranges from brown to dark gn brown in 10YR or 2.5Y hue. Texture is loam or loam. Thickness ranges from 24 to 36 inches. In p vertical cracks up to 1/i. inch wide occur to a dep 20 inches or more. This horizon is mildly alkali moderately alkaline and calcareous. The Cr horizon ranges from light yellowish bi light olive brown, very pale brown, light brov gray to pale yellow in 10YR or 2.5Y hue. It is erately alkaline and calcareous in some parts. 180—Nacimiento clay loam, 15 to 30 percent al This moderately steep soil generally occurs on hilt/ ,About 10 percent of this mapping unit is ind areas of Anaheim clay loam, 5 percent Alo cL percent Anaheim loam, 2 percent Cieneba sandy and 2 percent Balcom clay loam. If the soil is bare, runoff is medium to rapid the erosion hazard is moderate to high. Present land use is pasture, range, and water Capability unit IVe-1 (19) ; Clayey range site; index 39. 181—Nacimiento clay loam, 30 to 50 percent sl This steep soil generally occurs on hillsides. Ii the profile described as typical of the series. About 10 percent of this mapping unit is inc areas of Anaheim clay loam, 5 percent Alo clay, e cent Anaheim loam, 2 percent Cieneba sandy loam 2 percent Balcom clay loam. If the soil is bare, runoff is rapid and the er hazard is high. Present land use is range and watershed. Capa unit VIe-1 (19) ; Clayey range site; Storie index_ Omni Series The Omni series consists of poorly drained s flood plains and in basins. These soils formed in alluvium. Slopes are 0 to 2 percent. Elevation from 25 to 150 feet. The vegetation is annual 9 1 1 1 1 1 i ORANGE COUNTY, CALIFORNIA ' 39 mustard, and plants that require moisture. Precipita- tion is 12 to 14 inches, and the mean annual air temper- ature is about 61°F. The frost -free season is 280 to 300 days. In a typical profile the surface layer is gray clay 17 inches thick. The, subsoil is light gray clay, with prom- inent olive .brown mottles, 33 inches thick. Below this .is a buried _dark gray, mottled clay that extends to a depth' of 60 inches or more. The soil is moderately alkaline and calcareous throughout. It is slowly permeable. Omni soils are used for row crops, field crops, and urban development. Typical profile of Omni clay, in Orange County, Costa Mesa area, about 200 yards south of Sunflower Avenue, about 200 yards east of Bristol Street, and about 20 feet east of the Santa Ana Channel (flood control channel), T. 5 S., R. 10 W., SBB&M. Ap-0 to 9 inches; gray (10YR 5/1) clay, very dark gray (10YR 3/1) moist; moderate very coarse prismatic structure, upper 1/2 inch is strong medium granular struc- ture; very hard, firm, sticky and plastic; common very fine roots; very few very fine tubular pores; strongly effervescent; disseminated lime; moderately alkaline; clear smooth boundary. Al2-9 to 17" inches ; gray (10YR 5/1) clay, very dark gray (10YR 3/1) moist; moderate coarse subangular blocky structure; very hard, firm, sticky and plastic; very few very fine roots; very few very fine tubular pores; strongly effervescent; dissemi- nated lime; moderately alkaline; clear_ smooth boundary. B21cag-17 to .31 inches; light gray (10YR 6/1) clay, dark gray (10YR 4/1) moist, many medium prominent olive brown (2.5Y 4/4) mottles; moderate medium suban- gular blocky structure; very hard, firm, sticky and plastic; very few very fine roots; many very fine tubular pores; strongly effervescent; disseminated lime and medium lime concretions; moder- ately alkaline; gradual smooth boundary. 2ag-31 to 50 inches; light gray (10YR. 6/1) clay, dark gray .(10YR 4/1) moist.; mangy* medium prominent olive brown (2.5Y 4/4) mottles; weak medium subangular blocky structure; very hard, firm, sticky and plastic; many very fine tubular pores; strongly effervescent; dissemi- nated lime and medium lime concretions; moderately alkaline; gradual smooth boundary. —50 to 60_ inches; dark gray (10YR 4/1) clay, very dark gray (10YR 3/1) moist ; common fine prominent olive brown (2.5Y 4/4) mottles; massive; very hard, firm, sticky and plastic; common very fine tubular pores; strongly effervescent; disseminated lime and medium soft lime masses; moderately alkaline. horizon ranges from very dark gray to gray hue; a very thin film of gray (10YR 5/1) particles coats some of the darker surface peds. Texture is silt loam or clay. The upper one-half inch of this horizon generally has granular or fine blocky structure; the rest has weak to strong coarse or very coarse pris- matic structure or weak to moderate coarse angular or subangular blocky structure. Reaction ranges from moderately alkaline to strongly alkaline. Thickness ranges from 12 to 20 inches. The B horizon may be light gray, dark gray, very dark grayish brown, dark grayish brown, or grayish brown in 10YR" hue. Part or all of this horizon has distinct or prominent mottles. Texture is heavy silty clay loam or clay. Reaction ranges from moderately alkaline to strongly alkaline. In places there is a C horizon within ,60 inches of the surface- A buried A horizon is common. In undrained' areas the water table is within a depth of 36 inches. Most areas now have altered drainage, however, and the water table is below 5 feet. Under natural conditions, most areas of this soil are moder- ately saline -alkali. Some are strongly saline -alkali. If drainage has been altered, the soil is generally no more than slightly saline -alkali. 182=Omni silt loam, drained. The profile of this nearly level soil is similar to the one described as typical of the series, but the surface layer is silt loam 10' to 14 inches thick. About 7 percent of this mapping unit is included areas of Chino silty clay loam and 5 percent Bolsa silt loam. The effective rooting depth is 60 inches or more. Available water capacity is 8.5 to 12.0 inches. Runoff '"is very slow, -and the erosion hazard is none to slight. . Present land use is row crops, field crops, and urban development. Capability unit Its-3 (19) ; range site not assigned; Storie index 50. 183—Omni clay. The profile of this nearly level soil is similar to_ the one described as typical of the series, but the water table is within a depth of 42 inches .and the surface layer is strongly, alkaline to moderately saline -alkali. About 5 percent of this mapping unit is included areas of Chino silty clay loam and 5 percent Bolsa silty clay loam. Runoff is very slow, .and the erosion hazard is none to slight. The effective- rooting depth is 40 to 60 inches. Available water -capacity is 8:5 to 12.0 inches. Present land use is field crops, duck ponds, and urban development. The high shrink -swell characteristics of this soil are problems in urban development. Ca- pability unit IIIw-6 (19) ; range site not assigned; Storie index 17. 184--Omni clay,, drained. This nearly level soil gen- erally occurs in basins. It has the profile described as typical of the series. Because altered drainage has lowered the water table to a depth of 60 inches or more, some of the excess salts has been leached from the root zone, and the soil is generally only slightly saline - alkali. About 5 percent of this mapping unit is included areas of Chino silty clay Ioam, drained; 3 percent Bolsa silty clay loam, drained; and 3 percent Cropley clay. If the soil is bare, runoff is very slow and the erosion hazard is slight. The effective rooting depth is 60 1 44 SOIL SURVEY development. Capability unit I (19) ; Loamy range site; Storie index 81. Soboba Series The Soboba series consists of excessively drained soils on flood plains and alluvial fans. These soils formed in mixed alluvium. Slopes are 0 to 15 percent. Elevation ranges from 50 to 2,500 feet. The vegetation is annual grasses, forbs, cactus, brush, and some trees. Precipitation is 12 to 20 inches, and the mean annual air temperature is about 62°F. The frost -free season is 250 to 300 days. In a typical profile the surface layer is light brown- ish gray and pale brown gravelly loamy sand to a depth of 10 inches. The underlying material is light gray very gravelly sand to a depth of 60 inches or more. Thin intermittent bands of sandy loam occur between depths of 12 and 30 inches. The soil is slightly acid throughout. It is very rapidly permeable. The effective rooting depth is 60 inches or more. Available water capacity is 2.0 to 3.0 inches. Soboba soils are used for citrus, pasture, range, and wildlife habitat. Typical profile of Soboba gravelly loam, 0 to 5 per- cent slopes, in Orange County, Rancho Mission Viejo, about 1,100 feet north-northwest of point where Riverside, San Diego, and Orange county lines meet, in La Paz Canyon, SW1/,SE1/, sec. 33, T. 7 S., R. 6 W., SBB&M. A1-0 to 10 inches; light brownish gray (10YR 6/2) and pale brown (10YR 6/3) gravelly loamy sand, dark grayish brown (10YR 4/2) and brown (10YR 4/3) moist; single grained; loose, nonsticky and nonelastic; common very fine roots; many fine, medium and coarse interstitial pores; 25 percent pebbles and 5 percent cobbles; slightly acid; clear wavy bound- ary. C1-10 to 40 inches; light gray (10YR 7/2) , light brownish gray (10YR 6/2) and pale brown (10YR 6/3) very gravelly sand, dark grayish brown (10YR 4/2) and brown (10YR 4/3) moist; single grained; loose, nonsticky and nonelastic; few very fine, common medium roots; many fine, medium and coarse intersti- tial pores; two thin intermittent bands of sandy loam occur at about 12 and 30 inches; 50 percent pebbles and 10 percent cobbles; slightly acid; diffuse wavy boundary. C2-40 to 60 inches; light gray (10YR 7/2), light brownish gray (10YR 6/2) , and pale brown (10YR 6/3) very gravelly sand, dark grayish brown (10YR 4/2) and brown (10YR 4/3) moist; single grained; loose, nonsticky and nonplastic ; few very fine and medium roots; many fine, medium and coarse interstitial pores; 40 percent pebbles and 20 percent cobbles; slightly acid. The Al horizon ranges from light brownish gray to pale brown to brown in 10YR and 2.5Y hue. Texture ranges from gravelly to cobbly sand to very fir: loam or gravelly loamy sand. Reaction rang slightly acid to mildly alkaline. Thickness rang 0 to 15 inches. The C horizon ranges from light gray ai brownish gray to gray and from grayish brown brown to brown in 10YR or 2.5Y hue. This ho stratified. It is 35 to 60 percent pebbles and Texture ranges from very gravelly or very cob) to coarse sandy loam. Reaction ranges from acid to mildly alkaline. 197—Soboba gravelly loamy sand, 0 to 5 slopes. This nearly level to gently sloping soil g( occurs as long, narrow areas along stream cl It has the profile described as typical of the se About 10 percent of this mapping unit is i areas of a soil that is dominantly very gravell; loam throughout but is otherwise similar to 1 boba soil; 5 percent Corralitos loamy sand; 7 R iver wash ; and 5 percent Soboba soils that gravelly very fine sandy loam overwash. If the soil is bare, runoff is slow and the hazard is slight. Present land use is citrus, pasture, range, ar, life habitat. Capability unit VIs-1 (19) ; Sand; site; Storie index 30. 198—Soboba cobbly loamy sand, 0 to 15 slopes. This nearly level to strongly sloping sc erally occurs as long, narrow areas along channels. The profile is similar to the one de as typical of the series, but the surface layer is loamy sand. About 10 percent of this mapping unit is ii areas of a soil that is dominantly very gravelly loam throughout but is otherwise similar to t; boba soil; 5 percent Corralitos loamy sand; 5 1 Riverwash ; 5 percent steeper Soboba soils; and cent Soboba soils that have a stony loamy sand layer. If the soil is bare, runoff is slow to medium z erosion hazard is slight to moderate. Present land use is pasture, range, and wildlif tat. Capability unit VIs-1 (19) ; Sandy rang Storie index 29. Soper Series The Soper series consists of well drained s( foothills. These soils formed in weakly consol sandstone and conglomerate. Slopes are 15 to 7 cent. Elevation is 200 to 2,500 feet. The vegeta- sage, cactus, and brush and in some areas an story of annual grasses and forbs. Precipitatior to 20 inches, and the mean annual air temperat about 62°F. The average frost -free season is 350 days. In a typical profile the surface layer is I slightly acid gravelly loam 8 inches thick. Th. soil is reddish brown and yellowish red, neutral elly clay loam and gravelly loam 21 inches thic) underlying material is weathered conglomerate soil is moderately slowly permeable. Soper soils are used for pasture, range, ovate and wildlife habitat. Typical profile of Soper gravelly loam, 30 to 5 D 7 E 1 1 1 L L 1 1 I 1 IJ LJ I 1 I Ll 1 1 1 1 46 SOIL -SURVEY erosion hazard is high. Available water capacity is 3.0 to 4.0 inches. The effective rooting depth is 20 to 32 inches. Present land use is range, watershed,_ and wildlife Habitat. Capability unit VIIs-1 (19) ; Loamy range site; Storie index 18. - 204—Soper.-Rock outcrop complex, 30, to 75 percent slopes. This ,mapping unit commonly occurs on hill- sides and ridges. It is 10 to 15 percent Rock outcrop. The Soper soil has a profile similar to the .one de- scribed -as typical of the series, but it is severely eroded and therefore shallower. About 3 percent of this mapping unit is included areas of Anaheim loam, 5 percent Cieneba sandy loam, and 20 percent Soper cobbly loam. If the soil is bare, runoff is rapid and the erosion hazard is high. Available water capacity is 2.5 to 3.5 inches: The effective rooting depth is 20 to 24 inches. Present land use is range, watershed, and wildlife habitat. Capability unit VIIs-1 (19) ; Shallow Loamy - Rock outcrop complex range site; Storie index 7. Sorrento Series The Sorrento series consists of well drained soils on alluvial fans and flood plains. These soils formed in alluvium derived from sedimentary rocks. Slopes are 0 to 9 percent. Elevation ranges, from 50 to 700 feet. The vegetation is ,annual grasses and forbs and some sycamore trees. Precipitation is 12 to 16 inches, and the annual air temperature is 59 to 62°F. The frost -free season is 270 to 355 days. In a typical profile, the surface layer is grayish brown loam .12 inches, thick. The underlying material is grayish brown, light brownish gray, and _pale brown, silty clay loam to a depth of 62 inches and light brown- ish gray sandy loam to a depth of 72 inches or more. The soil is neutral in the upper 6 inches and becomes moderately .alkaline and calcareous below. It is mod- erately permeable. The effective rooting depth is 60 inches or more. Sorrento soils are used for irrigated crops, citrus, And urban development. Typical profile of Sorrento loam, 0 to 2 percent slopes, about 500 feet northeast of the corner of Irvine Boulevard and the road to El Toro Marine Firing Range, Ski/� SWI/... sec. 120 (by private survey), T. 5 S., R. 8 VT., SBB&M. Apt-0 to 6 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; hard, friable, slightly sticky and slightly plastic; few very fine roots few very fine tubular pores; neutral.; abrupt smooth boundary. Ap2-6 to 12 inches; grayish brown (10YR 5/2) heavy loam, very dark grayish brown (10YR 3/2) moist; moderate medium and coarse subangular blocky structure.; slightly hard, friable, nonsticky and .slightly plastic; few very fine roots; few very fine and fine tubular pores; mildly alkaline; clear wavy boundary. C1-12 ,to 21 inches; grayish brown (10YR 5/2) light silty clay loam, very dark grayish brown (10YR 3/2). moist; massive; friable, slightly sticky and plastic; very fine roots; few very fine to pores; moderately alkaline; clear boundary. C2-21 to 27 inches; grayish brown (10YR light silty clay loam, very dark gr. brown (10YR 3/2) moist; mas slightly hard, very friable, sli; sticky and slightly plastic; common fine roots; many very fine and fine i lar pores; moderately alkaline; gr. wavy boundary. C3-27- to 37 inches; grayish brown (10YR light silty clay loam, very dark gr, brown (10YR 3/2), moist; mas slightly hard, very friable, slightly s and slightly plastic; common very roots; common very fine and fine tul pores; moderately alkaline; gradual boundary. C4ca-37 to 4-9 inches; light brownish (10YR 6/2) Tight silty clay loam, br (10YR 4/3 )- moist; massive; sli,( .hard, very friable, slightly sticky slightly plastic; common very fine fine roots; common very fine and tubular pores; disseminated lime common fine filaments and fine masses of lime; moderately alkaline; lently effervescent; abrupt wavy bol ary. C5ca-49 to 62 inches; ,pale brown (10YR t silty clay loam, brown (10YR ' moist; moderate coarse subang blocky structure; hard, friable, slig sticky and plastic; few very fine ro common fine filaments of lime; mo ately alkaline; violently effervese. abrupt smooth boundary. IIC6-62 to- 72 inches; light brownish gray (1( 6/2) sandy loam, dark grayish brs (IOYR 4/2) moist; massive; soft, � friable, nonsticky and nonplastic; � few very fine roots; few fine tuba pores; moderately alkaline and viole, effervescent. The A horizon ranges from dark grayish browr grayish brown to brown in 10YR hue: Texture is sa- loam, 'loam, or clay loam. Reaction ranges from sligi acid to moderately alkaline. In places the soil is n calcareous. Thickness ranges from 10 to 20 inches The C horizon ranges from grayish brown to li yellowish brown in 10YR or 2.5Y hue. Texture, is lo. silt loam, or silty,clay loam. This horizon is calcarec at least in some parts above 40 inches. _ In places the surface area is 2 to 3 percent gra- In other places the profile is 2 to -3 percent gravel. 205—Sorrento sandy loam, 0 to 2 percent slot This nearly level soil generally occurs on alluvial f. and flood plains. It .has the profile similar to the described as typical- of the series; but the surface la; is 10 to 14 inches of sandy loam. About 10 percent of this mapping unit is incluc areas of Sorrento loam, 0 to 2 percent slopes; 5 perc Ip 7 ORANGE COUNTY, CALIFORNIA Wocho sandy loam, 0 to 2 percent slopes; 5 percent `&m Emigdido fine sandy loam, 0 to 2 percent slopes; ;and 5 percent soils that are noncalcareous throughout -but are otherwise similar to this Sorrento soil. t If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 10.0 to ,13.0 inches. �L-Present land use is irrigated row crops, citrus, and 'urban development. Capability unit I (19) ; Loamy range site; Storie index 95. r 206—Sorrento loam, 0 to 2 percent slopes. This nearly level soil generally occurs on alluvial fans and flood plains and in small valleys. It has the profile described as typical of the series. About 10 percent •of this mapping unit is included areas of Sorrento clay loam; 3 percent Sorrento sandy loam; 5 percent soils that are noncalcareous through- out but are otherwise similar to this Sorrento soil; 5 percent Mocho loam, 0 to 2 percent slopes; and 3 per- cent Bolsa silt loam, drained. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 10.0 to 13.0 inches. Present land use is irrigated row crops, citrus, and urban development. Capability unit I (19) ; Loamy range site; Storie index 100. 207—Sorrento loam, 2 to 9 Percent slopes. This gently sloping to moderately sloping soil generally oc- curs on upper valley fans and along stream channels. About 10 percent of this mapping unit is included areas of Sorrento clay loam; 5 percent soils that are noncalcareous throughout but are otherwise similar to this Sorrento soil; 5 percent Mocho loam, 2 to 9 Percent slopes; 3 percent Botella loam, 2 to 9 percent Slopes; and 3 percent areas of Sorrento loam where the slopes are somewhat steeper than 9 percent. If the soil is bare, runoff is slow to medium and the erosion hazard is slight to moderate. Available water capacity is 10.0 to 13.0 inches. Present land use is irrigated crops, citrus, range, and urban development. Capability unit IIe-1 (19) ; Loamy range site; Storie index 90. 208—Sorrento clay loam, 0 to 2 percent slopes. This nearly level soil generally occurs on alluvial fans and flood plains. It has a profile similar to the one de- scribed as typical of the series, but the surface layer is 10 to 14 inches of clay loam. About 10 percent of this mapping unit is included areas of Sorrento loam, 0 to 2 percent slopes; 5 percent Mocho loam, 0 to 2 percent slopes; 3 percent Bolsa silty clay loam, drained; 3 percent Chino silty clay loam, drained; and 5 percent soils that are noncal- careous throughout but are* otherwise similar to this Sorrento soil. If the soil is bare, runoff is slow and the erosion hazard is slight. Available water capacity is 11.0 to 13.0 inches. Present land use is irrigated crops, citrus, and urban development. Capability unit I (19) ; Clayey range site; Storie index 85. 209—Sorrento clay loam, 2 to 9 percent slopes. This gently sloping to moderately sloping soil generally oc- curs on upper valley fans and along stream channels in 10- to 100-acre areas. It has a profile similar to the 47 1 one described as typical of the series, but the surface layer is 10 to 14 inches of clay loam. About 10 percent of this mapping unit is included areas of Sorrento loam, 2 to 9 percent slopes; 5 percent soils that are noncalcareous throughout but are other- wise similar to this Sorrento soil; 5 percent Mocho loam, 2 to 9 percent slopes; 3 percent Botella clay loam, 2 to 9 percent slopes; and 3 percent areas of this Sorrento soil where slopes are somewhat steeper than 9 percent. If the soil is bare, runoff is slow to medium and the erosion hazard is slight to moderate. Available water capacity is 11.0 to 13.0 inches. Present land use is irrigated crops, citrus, and ur- ban development. Capability unit IIe-1 (19) ; Clayey range site; Storie index 76. Tliapto-Histic FIuvaquents Thapto-Histic FIuvaquents consists of poorly drained soils in coastal basins. These soils formed in mixed mineral alluvium and organic deposits. Slopes are 0 to 2 percent. Elevation ranges from 5 to 50 feet. The vegetation is saline -alkali tolerant grasses and forbs that require moisture. Precipitation is 10 to 14 inches, and the mean annual air temperature is about 62°F. The frost -free season is 300 to 350 days. In a typical profile the surface laver is 9 inches of very dark gray clay loam and 12 inches of dark gray silty clay. The underlying layers are 35 inches of black peat and 12 inches or more of light gray silty clay loam with many fine distinct light yellowish brown mot- tles. The soil is medium acid to strongly acid in the peat layers and moderately alkaline in the mineral layers. The 21- to 50-inch zone has some white salts. Per- meability is slow. The effective rooting depth is only 24 to 40 inches because of the water table. Available water capacity is 6.0 to 10.0 inches. These soils are used for row crops, field crops, and duck ponds. Reference profile of Thapto-Histic Fluvaquents, in Orange County, Irvine Range, about 1/1 mile southwest of Lane Road, NE1/4NE1/_� sec. 59 (by private survey), T. 6 S., R. 9 W., SBB&M. Apt-0 to 3 inches; very dark gray (2.5Y 3/0) clay loam, black (2.5Y 2/0) moist; mod- erate medium and fine granular struc- ture; hard, firm, sticky and plastic; few very fine roots; few very fine tabular pores; estimated 10 to 20 percent organic matter; slightly effervescent; moderately alkaline; abrupt smooth boundary. Ap2-3 to 9 inches; very dark gray (2.5Y 3/0) heavy clay loam, black (2.5Y 2/0) moist; moderate fine and medium granular structure; hard, firm, sticky and very plastic; common very fine and fine roots; few very fine and fine tubular pores; estimated 10 to 20 percent organic mat- ter; slightly effervescent; moderately alkaline; clear wavy boundary. A13-9 to 14 inches; dark gray (2.5Y 4/0) silty clay, black (2.5.Y 2/0) moist; moderate fine and medium granular structure; 1 1 r_1 1 1 1 �I 1 11 1 1 i 1 1 1 1 1 1 1 1 1 1 1 1 1 1 i TECHNICAL MEMORANDUM TM 3-20 WILDLIFE CROSSING AT SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR MARCH 19, 1990 Prepared by: FRANK S. CHAO CDMG Actions: Project Manager: Approved Engineering Manager: Approved Project Director: Approved SCOR0202.OHA A DRAFT APR 2 41990 Date: Date: Date:. t 1 1 1 I 1 1 1 1 1 1 1 1 i TABLE OF CONTENTS SECTION Background Analysis Location Structure Type Recommendation Attachments: Location Plans Cost Estimate Memorandum from Caltrans SCOR0202.OHA PAGE 1 1-2 3 4 rBACKGROUND A memorandum, issued by LSA dated December 22, 1989, which is a follow up to previous memos on SJHTC wildlife crossing locations, has been studied. LSA has recommended in the memo that an undercrossing facility is a better choice as opposed to an overcrossing facility as prepared in DEIR No. 494 based on a number of comments received on that DEIR and the relatively higher cost of an overcrossing design. Three locations for the possible wildlife crossing facility, which LSA has indicated in that memo, are listed below: o Wood Canyon drainage in the Aliso Viejo Dedication ' area. o Sycamore Hills area between Laguna Canyon Road and E1 Toro Road. o Head of'Shady and Emerald Canyons. These three locations are indicated in the attached sketch SK-1. LSA requested that these locations should be studied to determine the feasibility of incorporating undercrossing facilities. ANALYSIS A. Location CDMG has studied the above mentioned three locations and found: 1. Wood Canyon: The profile of the SJHTC in this area is much lower than the existing ground. Therefore, the issue of the Corridor crossing over a drainage area on a bridge, as recommended in the LSA memo, is not being considered. A major portion'of the northern side of the Corridor between Glenwood Drive and El -Toro Road has been graded recently by the developers for their proposed housing projects, and the existing contours have been changed as a result as shown on attached ' sketch SK-2. In addition, the Aliso Viejo Company, the owner and developer in,this area, has laid out a master development plan as shown on -attached sketch SK-2A, which included the Wood canyon area as a part of the development plan. Thus, it is clearly not feasible to locate the wildlife crossing facility in the Wood Canyon area. A location at the SJHTC station 9752+00 was'examined for the possible wildlife crossing. This area has been graded for the Corridor use. The undercrossing will be 440 feet in length with an average cover of 10 feet on SCOR0202.OHA Page-1 top of the structure. The slope of the ground inside of the crossing is fairly flat and is in a straight grading, which provides direct vision from end to end. The approach at each end of the crossing is in a relatively flat, gentle rolling hills and is easy to access. The disadvantage is, it is too close to the developed housing community that the wildlife may be too frightened to use it. The green area north of the Corridor is less than 100 acres. It is questionable that the wildlife will even enter into this area at all. A corrugated metal plate arch as described under "Structure Type" was considered for the undercrossing. The cost of the crossing is estimated at $783,000 as shown on attached sheet Cl. 2. Sycamore Hills Area: The SJHTC is in a cut section throughout the entire length between E1 Toro Road and Laguna Canyon Road. The collector/distributor road on either side of the corridor is lower than the mainline which forces the wildlife crossing substantially below the existing ground, and thus even more difficult to accommodate. The area at the northeast portion of the corridor has been fully developed into a multi -unit housing community, thus providing limited pasture for grazing. Two possible locations as shown on attached Sketch SK-3 were studied. Both locations require deep excavation from the existing grade with down slope entrances creating darkness inside the undercrossings. The crossings provide no direct vision from one end of the tunnel to the other end due to the grade changes needed to match the existing ground contours. Another possible crossing could be located near SJHTC Station 9790+00 at the south end of the Laguna Canyon Road viaducts. A short tunnel could be placed under the northbound ramp and the wildlife could be guided on ground to pass under the bridges with fencing around as indicated on plan of Sketch SK-3. However, the wildlife may not use the crossing since a major part of it is exposed and is too close to heavy traffic from the corridor and Laguna Canyon Road. A corrugated metal plate arch was considered for these three locations also. The cost for locations 1, 2, and 3 is estimated at $914,000, $1,128,000, and $383,000 respectively as per derivations on attached Sheets C2, C3, and C4. 1 �JI 1 [�I 1 1 �J 1 I SCOR0202.OHA Page 2 1 L� 3. Shady Canyon: location A for the undercrossing was selected at SJHTC Station 9844+60, approximately 6000 ' feet north of Laguna Canyon Road Interchange. This selection was based on a study of the cross sections along the SJHTC from Station 9820+00 to Station 9884+00 (see attached Sketch SK-4) - including a search for a suitable location for the wildlife crossing. The selection of the above mentioned location was based on the following advantages: o Open. natural terrain away from developed area with enough land for grazing. o SJHTC is in a fill area which provides open and easy access for animals. o Straight grade for visibility from end to end. o Natural lighting can be provided with openings in the median area. A corrugated metal plate arch and a precast concrete arch were considered for this location. The cost of the crossing using a metal arch is $775,000 as plate per derivation on attached Sheet C6. The cost of the crossing using a precast concrete arch is $640,000 as shown on attached Sheet C5. B. Structure Type Two types of structures were studied for the, undercrossing structure: 1. Corrugated Structural Metal Plate Arch: (.see attached Sketch SK-5) A metal arch with 20 feet in width and 15 feet in height as suggested in Caltrans' memorandum dated January 11, 1989 from D. C.. Butler to R. L. �. Hartje was studied. In the memorandum, it is pointed out that similar crossings have been successfully constructed in the past _(see attached memo) . 2. Precast -Concrete Arch: (see attached Sketch SK-6) An optional design from Hydro Conduit Corporation of Corona, California was also examined for cost comparison with the metal arch crossing. The structure is constructed with precast concrete sections to provide a 20 foot wide and 15 foot high crossing. The concrete footing and wing SCOR0202.OHA Page 3 walls can be cast in place. This type of structure assumes less maintenance work. A conventional cast -in -place reinforced concrete structure can also be used, so it can be designed and constructed by any consulting engineer and contractor without being limited to a special designed and manufactured product. Recommendation Based on the analysis stated herein, it is recommended that a wildlife crossing can be provided in the Shady Canyon area near the SJHTC Station 9844+00 is the most feasible location. The exact location shall be determined during the detail design when the final road information is available. The other two locations at Wood Canyon and Sycamore Hills have disadvantages as enumerated, and hence should be dropped from further consideration. For purposes of the environmental document, we recommend that this report be described within the text of that document in the appropriate narrative format, and that a rendering be included of the undercrossing at Station 9844+00. 1 1 LI 1 P I 1 SCOR0202.OHA Page 4 1 I L� I I I I 1 1 11 I I I C� 0 M- 0 [I- SK-1 a� sK-2 � OR `'"' �' �,�� •fit, �'si'�i'.? y' f t. ♦ i• y t _-oz NP a .a r"� - �. q `J a:�� .Jr ::: ��, r•^•�•c'y',ys' �• 'emu , `.,fir_ - '4s' �.''' . j - . t-I t.t . ,- t t , . }.+,tr�'ffietr7i' �• •` ' '6• • • '�:f: ::•:� l�h� a 'ti ti rrp,4-:E .•. = � T 1 \, t a s �`•., ''�•� 1 4 r.,, -}y'�k ,`:+- � at } ,+.. 4 , i. .. �+. `.•�•✓r:e ^ •��,��'; *ss?• "7 • .t.. - ; *.•tA � �' � Tt . „ � • ' _ `'•1i�i.ipr}f!'>1 '•A±S'�%7v;.'�e �.?, r� •11:-. ••�• • ttr�� � :•':•%��.+�-�y•{J,�`�i �n\'�,, :� � �: = tt, �•;•. %'T"`'�r .CI'I• .t:•�FT,•�•,•�„'� ..>+1+,• 'I r•.i'•:J•!�'e'`�:�CR�.''►�.'h�•.•.::' yA� �:f1t .• .. 1j 1 N.Ij�i•., fir. • .• •zF,` �,i•.:•�..• • � _a .r�..� ..,?� �t.'i.u31��;•,.��3 :u•y ••s;,f: tJ.i:::;_,.. �' ',�4 , � Rl.•'�.�'ii':!►.'r7 t'(��+�. �L�.{,f��!"�'"r���1Ee' � � •_i• ".>� ' /'ir` ;:yi'�%�r•aJS,}}T� :i;!,}��Tt.rt: _i f:�r.Yry�:y��•C:1 }t" T s„Y :1 sit`+ Fr '��„� .i':.,•• _ fit,,. 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' Y �,: .�` ''/t/r j�' .a.(:� .i� �{sh.'-�'"L7•,�q• '--.�?��'4.'N»il�Itr a h• w � ..�',• �_' r" r. 1 : ^ - , • Cv , (Md_ _ :Y ,r..��: • .• w �r�e )..,^.q. 1;.�� T ,i•'rr �.,,., 1 , �Q�, .•J .' rti rt,e 7 + �.1 e��t��'. ^�fiT �;y}(�� ��r`'•'-•�;�`F.S:� �� � �' �•-+,� �,�,I: _7 t •, ':'. ttC.' SKI-2-A S-)IS 9 [ I F I 5 il�, 1V z /VAA INN till 7,0 zw fz=- oc,NT�o OCX-Tjot4 2) (L MIC C) ez co M do,% m 0 C) S OMM O > mm co c m Q) Z> 0 oc Z M-0 CA) M > Z G) m -Soo I _ Soa doo -o-- Zoo ioo b .".— oc—�snu _e �400 So Stq, q Jo too Soo \ 900 Sfa . 98t4+••�=. 1_ S�a•yygotoo. — . ' Sfa. 9 �4foo --'� .•_,..—_ 700 �•\ Sfa. 984dt o ._._._�_.._ _.— _._ � _.. . !ee \ Sfi . l8so too 700 �_` SfD.QPF�Zt0O ee 1 �y�r 51?,?70 toO i e. - . _ _ � �Sin.987itee �— �Sfa.9d otoo � l I � � Sfo.9Hpatoo SK-4 ss cy of 4� a % � •S � e 4 tV� 4 4 Bch Nr oq 62 a Z l O vV � W N N N O W N S W N z < N mt �s Q} Qo z u y C1 t Z T. O O � F- < W ci L W all k O !• x W^ z ��III S F- S O z O 0 V Z O H O a z a I oc N . J J 'i z: Z W j' a W —a �- , u • a OW ILI ZG Q co o , c v :t W R y 0• SK-5 w ��c W :• o e' e i o o i 0 _: U D H � D ti 4 o l� & � :u v; w• g �pp u m � 1W � V W 'a to N Q p m mu � � N 'y o Z y h Sl/I011 V q -` C F M V � i 4V tT a ,a c _ oq O o F-• 6 c C) .2 N c°b N c ui O U = J - Q Z 0 0 J SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR COST ESTIMATE FOR WILDLIFE UNDERCROSSING LUCA1 ION s WOOD CANYON. STATION 9752+0O TYPE: CORRUGATED STRUCTURAL METAL PLATE ARCH ITEMS E T R U:, T t. I F, A L LAVAT 101d C0I4--RE T c FOOTING '.Ic-AL ARCH �01.CRETE COLLPiR BACF r I LL MATERIAL PRICE UNIT QUANTITY UNIT COST TOTAL REMARKS C.1' . C9.00)o $2 $56.0i 0 C.Y. '20 $10 ffi .20(1 C . Y . 275 91 30�:� CSC . 5�?U LB. 77 Z . �)00 $1 . 10 $410 . G0�:� C . Y , qB ir:100 129 . 4UU C.'Y. 715 $400 $14.000 C . `r . 14 . 500 '1 $29 . 000 SUP.. —TOTAL $6C6 . 40C, 25% CON f INGENCY $156.6k,(> TOTAL. cl?137.. 0 C.)f i C1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 5AN 99W I N H I LLR TRAWR®RTAT 19N 99RR I NR COST ESTIMATE FOR WILDLIFE UNDERCROSSING LOCATION: SYCAMORE HILLS, STATION 9774+00 (LOCATION 1) TYPE: CORRUGATED STRUCTRUAL METAL PLATE ARCH MATERIAL PRICE ITEMS UNIT QUANTITY UNIT COST TOTAL REMARKS EXCAVATION C.Y. 71,230 $2 $142,460 STRUCTURAL EXCAVATION C.Y. 300 $10 $3,000 CONCRETE FOOTING C.Y. 255 $300 $76,500 METAL ARCH LB. 347,000 $1.10 $381,700 CONCRETE THRUST BEAM C.Y. 90 $300 $27,000 CONCRETE COLLAR C.Y. 31 $400 $12,400 BACKFILL C.Y. 44,100 $2 $88,200 SUB -TOTAL $731,260 25% CONTINGENCY $182,740 TOTAL $914,000 C2 9AN 990991H NILL§ 3PAN§P®RTATlPN 99PRIPPR COST ESTIMATE FOR WILDLIFE UNDERCROSSING LOCATION: SYCAMORE HILLS, STATION 9766+00 (LOCATION 2) TYPE: CORRUGATED STRUCTRUAL METAL PLATE ARCH MATERIAL PRICE ITEMS UNIT QUANTITY UNIT COST TOTAL REMARKS EXCAVATION C.Y. 66.000 $2 $132,000 STRUCTURAL EXCAVATION C.Y. 420 $10 $4,200 CONCRETE FOOTING C.Y. 360 $300 s108,000 METAL ARCH LB. 492,000 $1.10 $541,200 CONCRETE THRUST BEAM C.Y. 126 $300 $3B,400 CONCRETE COLLAR C.Y. 35 $400 $14,000 BACKFILL C.Y. 32,300 t2 $64,600 SUB -TOTAL $902,400 25% CONTINGENCY $225,600 TOTAL $1,12B4O00 C3 SAN JOAOUIN HILLS TRANSPORTATION CORRIDOR COST ESTIMATE FOR WILDLIFE UNDERCROSSI'NO LOCATIONS SYCAMORE HILLS. STATION 9790+00 (LOCATION 3) TYPES CORRUGATED STRUCTURAL METAL PLATE ARCH AND CHAIN LINK FENCE ITEMS EXCAVATION STRUCTURAL EXCAVATION CONCRETE FOOTING METAL ARCH CONCRETE THRUST BEAM CONCRETE COLLAR BACK FILL FENCING MATFR UNIT C.Y. T_Al QUANTITY 8,000 pR T r; UNIT COST -TOTAL REMARKS $16,000 $2 C.Y. 120 $10 $1,200 C.Y. 102 $300 $30,600 LB. 140,000 $1.10 $154-,000 C.Y. 52 $300 $15,600 C.Y. 28 $400 $1.1,200 C.Y. 4,800 $2 $9,600 LF. 3,400 $20 $66,000 SUB=TOTAL. $306,200 25% CONTINGENCY $76,600 TOTAL $383,000 C4 9AN 49NU I N M 1669 TRAMPOTAT 1®N 99PR I R COST ESTIMATE FOR WILDLIFE UNDERCROSSING LOCATION: SHADY CANYON, STATION 9844+00 TYPE: CORRUGATED STRUCTRUAL METAL PLATE ARCH MATERIAL PRICE ITEMS UNIT QUANTITY UNIT COST TOTAL REMARKS COMPACT FILL C.Y. 46,000 $2 $92,000 STRUCTURAL EXCAVATION C.Y. 330 $10 $3,300 CONCRETE FOOTING C.Y. 280 $300 $64,000 METAL ARCH LB. 360,000 $1.10 $396,000 CONCRETE THRUST BEAM C.Y. 95 $300 $28.500 CONCRETE COLLAR C.Y. 40 $400 $16,000 PART OF ROADWAY BACKFILL C.Y. 0 CONSTRUCTION SUBTOTAL $619,800 25% CONTINGENCY $155,200 TOTAL $775,000 C5 ON J®APU I N a I L-L§ TRANOROTAT I M ORR I P®R COST ESTIMATE FOR WILDLIFE UNDERCROSSING LOCATIONt SHADY CANYON, STATION 9844+00 TYPES PRECAST CONCRETE ARCH MANUFACTURED BY HYDRO CONDUIT CORPORATION MATERIAL PRICE ITEMS UNIT QUANTITY UNIT COST TOTAL. REMARKS COMPACT FILL C.Y. 46,000 $2 $92,000 STRUCTURAL EXCAVATION C.Y. CONCRETE FOOTING C.Y. *PRECAST CONCRETE ARCH LF. CONCRETE WINGWALL FOOTING C.Y. CONCRETE WINGWALL C.Y. *CONCRETE HEADWALL PIECE BACK FILL C.Y. 700 $10 $79000 590 $300 $1.77,000 400 $1.10 $172,800 96 $300 $28,800 80 $400 s32,000 2 $1,000 $2,000 0 SUB -TOTAL $511,600 25% CONTINGENCY $128,400 TOTAL t640.000 PART OF ROADWAY CONSTRUCTION C6 State of -''.o!iforni Memorandum To : R. L. HARTJE From . DEPARTMENT OF TRANSPORTATION D. C. BUTLER Subject: WILDLIFE CROSSING, SJHTC Business, Transportation and Housing Agency Date : JANUARY 11, 1989 File No.: ftECEIVEDW JAN Attached is a self explanatory memorandum from Judy Heyer on an alternative to the proposed Wildlife Overcrossing. If you wish to pursue this alternative, we will be happy to assist. D. C. Butler DCB:psh Attachment cc: J. E. Bennett, TCA W. E. Dunn, CDMG G. W. Foster, TCA J. Heyer, Caltrans R. J. McDowell, CDMG D. C. Tugwell, Caltrans Document Control CALT0111.901 'A 4✓ 1 f� I I 11 I i T 1 State of California M E M O R A N D U M Business,. Transportation and Housing Agency Date_: January 10, 1989 To: Dan Butler, Sup. T.E. Corridors/Toll Roads From: DEPARTMENT OF TRANSPORTATION Judy Heyer, Chief Environmental Planning, Branch B SUBJECT: Wildlife Migration I have reviewed the CDMG feasibility study for a wildlife crossing, i_n the Bommer. Canyon area of proposed San Joaquin Hills Transportation corridor. As noted in the study, preliminary estimates range between $7 Million and $10 Million for an overcrossing. You may be interested to know that CALTRANS District 11 is in the process of developing an undercrossina design for future Route 52 in coordination with USF&WS,,, California Department of Fish and Game, U.S. Navy's deer migration specialist, and City of San Diego. This facility would provide wildlife (parts-cularly deer and other large ranging mammals) access to expanded feeding and breeding areas. The agencies and the Navy have agreed on a conceptual design. Coordination will continue until plans are finalized. Estimated cost of this facility is about $500,000. Major features include: r Undercrossing in a fill area. (Animals walk up a slight -slope, enter and cross under highway.) Length: about 200 ft., Height: 15 .ft., Width: 20 ft. A Y rate system in center divider to allow light. 9 A .di rt bottom. Corrugated pipe construction (not square culvert). A chain link fence 10 feet high to corral deer toward opening; angled fence to give deer the perception the fence is much higher. Boulders strategically placed around the entrance area and bars at tunnel entrance itself to prevent poachers with 3-wheelers from using the facility. Similar, successful crossings have been constructed on Miramar Naval Air Base and a private San Diego development. See attached drawings. Research on the Navy Base has shown it takes about a year for deer to get used to the new crossing. Wildlife agencies prefer an undercrossing. Deer, for example, may not use an overcrossing; noise and lights tend to frighten the animals. Crossings can be as small as a 6-8 foot pipe size. Height and width increase as crossing length increases. Lack of light is a problem in longer crossings. Deer may be prey for predators if caught inside a smaller, longer, dark crossing. Grates in the median allow some natural light and minimize maintenance. The SR 52 environmental document will state grates shall remain even if future HOV lanes are constructed. If you think a similar crossing could work in Sommer Canyon the following contacts can provide additional information: Gary Klein, District 11, San Diego Route 52 Project Manager, (619) 237-6134 Christina Van Wanseele, District 11, San Diego Route 52 Environmental Project Analyst, (619) 237-6020 cc: Tim Vasquez, District 11 Gary Klein, District 11 Christina Van Wanseele, District 11 Dale Ratzlaff Ron Kosinski Jim Rae, Sacto Env. Environmental Files ROUTE 52 CULVERT w/SECURITY GRID U4 N 1 e ` NOV'-"' � 1 z' sole SOTTOM TOE OF SLOPE PROPOSED 1 WILDLIFE CROSSING tN0 SCALE) T ATTACHMENT 112 VAJ ■I w i 11 H U IANALYSIS OF AVOIDANCE ALTERNATIVES - WETLAND IMPACTS 11 i 1 1 1 I PREPARED BY LSA ASSOCIATES, INC. 1 PARK PLAZA, SUITE 500 IRVINE, CA 92714 (714) 553-0666 LSA PROJECT #TCA901A IJuly 23, 1990 It 1 ANALYSIS OF AVOIDANCE ALTERNATIVES -.WETLANDS IMPACTS Pursuant to the requirements of Section 404(b)(7) of the Clean Water Act, the following discussion provides the analysis of alternatives to the -preferred Corridor alignment and design which would have less adverse impacts on wetland habitats. The 404(b)(1) Guidelines state that: "For actions subject to NEPA, where the Corps of Engineers is the per- mitting agency, the analysis of alternatives required for NEPA environmental documents, including supplemental Corps 'NEPA documents, will in most cases provide the information for the evaluation of alternatives under these Guide- lines." (40 C.F.R. & 230.10(a)(4).) This analysis references previous project alignment alternatives which were evaluated in Phase I and Phase II of the Corridor project. The currently proposed project alignment incorporates the alternatives determined i'n EIR No. 494 which would incur the least amount of impact to wetland resources. The Demand Management Alternative would create significantly less wetland impacts at Oso Creek than the Conventional Alternative. Section 404 Requirements Under Section 404 of the Clean Water Act ((33 U.S.C. & 1344 (b)(1), the Environmental Protection Agency has promulgated. guidelines regulating the �+ discharge -of dredge and fill material into waters of the United States. The waters of the United States are under the jurisdiction of the Corps of Engi- neers (COE), which is the permitting authority for discharge activities. The guidelines disallow discharge into waters of the United States unless no other practicable alternative exists that does not have other significant adverse impacts. �i Definition of "Practicable" "An alternative is practicable if -it is available and capable of being done -after taking into consideration cost, existing technology, and logistics in light of overall project purposes. If it is otherwise a practicable alternative, an area not presently owned by the applicant which could reason- ably be obtained, utilized, expanded or managed in order to fulfill the basic purpose of the proposed activity may be considered." (40 C.F.R. & 230.10(a)(2).) i Water Dependency and the Presumption of Practicable Alternatives "Where the activity associated with a discharge which is proposed for a special aquatic site . . . [wetland] does not require access or proximity to or siting within the special aquatic site i-n-question to fulfill its basic purpose (i..e., is not 'water dependent'), practicable alternatives that do not involve special aquatic site are presumed to be available unless clearly demonstrated otherwise. In addition, where a discharge is proposed for a special aquatic site, all practicable alternatives to the proposed discharge whi-ch do not 1 1 I involve a discharge into a special aquatic site are presumed to have less adverse impact on the aquatic ecosystem, unless clearly demonstrated other- wise." (40 C.F.R. & 230.10(a)(3).) The Applicant's Purpose and Need In determining "practicability", the applicant's purpose and need with respect to the project must also be considered. (Friends of the Earth v. Hintz (1986) 800 F. 2d 822; Louisiana Wildlife Federation-v. York (1985) 761 F. 2d 1044.) Overall Project Purposes Construction of the Corridor is intended to further County and regional planning objectives affecting future development, and to provide access to regionally significant educational and recreational facilities. The "project objectives" articulated in Chapter 1.0 of the EIR/EIS are "the overall project purposes" as that phrase is used in the 404(b)(1) Guidelines. The Corridor has been taken into consideration as part of cooperative planning for open space preservation in South Orange County area. This plan- ning process has attempted to ensure that both the open space and circulation needs of the County's expanding population would be satisfied. The existence of large land ownerships in South Orange County provided the County of Orange and other public agencies with the ability to establish significant open space and recreational land in conjunction with the approval of several master planned communities. The proposed design and alignment of the Corridor has been the result of extensive effort to minimize impacts upon open space, wildlife habitat and other environmental resources. The proposed alignment generally avoids the large open space areas established by the County. Any alternative alignment would result in greater impacts on open space, recreational resources and wildlife habitat than the proposed alignment. A number of the alignment alter- natives previously considered in Phases I and II of the project would also re- quire the discharge of fill material into wetlands. Thus, although the pro- posed project alignment does impact several wetland areas, it has been designed to minimize impacts on open space and recreational resources, including wetland resources. PHASE I ALTERNATIVES ANALYSIS Phase I Non -Alignment Alternatives The Phase I EIR (EIR No. 267) investigated several specific non -alignment alternatives to the Corridor including the No Project Alternative. These alternatives are summarized in Chapter 2.0 of the EIR/EIS. The discussion in EIR No. 267 demonstrates that each of these non -alignment alternatives fail in one or more significant ways to achieve the overall purposes of the project, 2 11 1 1 It ti 1 1 1 1 11 1 and therefore none of those alternatives are considered practicable. EIR No. 267 is incorporated by reference herein, and the pertinent material is summa- rized in Chapter 2.0 of the EIR/EIS. Phase I Alignment Alternatives In addition to the non -alignment alternatives to the Corridor, alternative locations for the Corridor and alternative routes within the Corridor were evaluated in the EIR No. 267. These route alternatives were located in an approximately three mile wide corridor roughly bisecting the undeveloped area between I-5 and the Pacific Coast Highway. Initially, however, Corridor loca- tions farther north or south were also considered. These locations are deemed not practicable because they do not achieve the overall purposes of the project and would have significant adverse environmental consequences. Potential Corridor alternatives to the north would cross existing residential communities including Turtle Rock, Rossmoor Leisure World, and Nellie Gail Ranch.. Corridor alternatives to the south are not practicable because of the impact of the proposed construction on the recreational, scenic .and environmental resources �. of the coastal zone, including Wood Canyon and Crystal Cove State Park. In addition, these southerly alignment alternatives would adversely impact the communities of Laguna Niguel, Harbor View Knoll and adjacent residential areas in Newport Beach. Route Alternatives Specific to Wetlands. Alternative alignments that would impact wetland areas were also analyzed in EIR No. 267. The following is a brief summary of impacts resulting from these alignment alternatives. The Corridor was divided into four sectors (west, central, east central, and east) for evaluation of alternative alignments in Phase I. 'Within these sectors, potential alignments were identified and analyzed. The geometric and design standards that guided the development, of these alternative alignments are summarized in Table 2.8.0 in Chapter 2.0 of the EIR/EIS. Four potential alignments were rejected in Phase I as not practicable. These were a southerly line through Laurel Canyon in the central sector, a southerly line around the existing federal General Services Administration Facility in the east central sector, and two northerly lines north of Crown Valley Parkway in the east sector. Each of the alternative alignments fail in one or more material ways to achieve the overall purposes of the project prima- rily improved traffic circulation and minimization of impacts on existing development. Furthermore, two (the southerly line through Laurel Canyon and one of the northerly lines north of Crown Valley Parkway) have serious adverse environmental consequences. These alternatives are discussed in greater detail in Chapter 2.0 of the EIR/EIS. EIR No. cluding: 267 analyzed 28 route segments in the four sectors in detail in- Nine in the west sector (Segments 1-9); Nine in the central sector (Segments 10-28);' Four in the east central sector (Segments 19-22); and Six in the east sector (Segments 23-28). t1 3 A discussion and comprehensive evaluation of the transportation service, costs, community and environmental impacts of each individual alternative is contained in EIR No. 267. These impacts are summarized in Tables 2.8.0 through 2.8.E of Chapter 2.0 of the EIR/EIS. An area by area analysis of the Phase I route alternatives for wetland areas is provided below. Bonita Creek/San Diego Creek Channel. All of the alternative align- ments evaluated in EIR No. 267 would have the same environmental effect on the Bonita Creek and -San Diego Creek channels. The proposed alignment, as with all other alternatives analyzed, would require realignment of Bonita Creek. Drain- age is to the north and west via San Diego Creek and Bonita Creek, discharging into Upper Newport Bay. Special controls would need to be implemented to prevent potential erosion during the temporary grading and construction work on the Corridor. Increased amounts of sediment would be transported by storm runoff to local watercourses, coastal beaches, and Newport Bay. Bonita Canyon Reservoir. Alternative alignments evaluated in EIR No. 267 would either impact the reservoir more directly and significantly or would turn north or south to bypass the reservoir. The alternatives which would avoid the Reservoir entirely would infringe on UC Irvine property and known cultural resources to the north, with significant grading impacts. Alternative alignments to the south would pass near to existing residential development at Harbor View Knoll and nearby communities. Harbor View Knoll is at least 500 feet away from any of the nearest alternative alignments studied in that area. Projected Leq noise levels in existing residential areas will not exceed ap- proximately 67dBA and would be less than the County 65 CNEL standard. These alternative alignments are considered to have much greater environmental impacts and related costs than the proposed project alignment. Pelican Hill Road. Identical impacts to intermittent riverine streambed wetland resources at the Pelican Hill Road/Culver Drive interchange would be created by all but one of the Phase I alternative alignments. One alternative was proposed south of this area largely in the Coyote Canyon Sani- tary Landfill and closer to Harbor Ridge and Spyglass Hill. Relocation of this alternative closer to Harbor Ridge and Spyglass Hill makes it not practicable due to views of the Corridor from these communities. There are views from homes in the Harbor Ridge Community which look across the Bonita Canyon Valley in the eastern Bonita Canyon area. Both residential communities of Harbor Ridge and Spy Glass Hill would have views of a portion of a few alternative alignments across San Joaquin Reservoir at a distance of 2,200 feet or more. The alternative proposed in the Coyote Canyon Sanitary Landfill would disturb a greater portion of the landfill compared to other alternatives and, therefore, would not be practicable due to the costs of implementing the neces- sary mitigation measures, i.e. soil testing and analysis to determine quanti- ties, types and extent of waste materials with emphasis on possible hazardous waste; removal and transport of hazardous wastes; and air quality/ hazardous waste study to address issues such as possible leakage of lethal or cancer causing gases. 4 11 Laguna Canyon Road. Impacts to the wet meadow located along Laguna Canyon Road would be avoided by certain alternative alignments considered in EIR No. 267. These alternatives, though, would intersect the Laguna ridgeline and open space areas identified in the Orange County General Plan. Such alter- native alignments would be in close proximity to the Laguna Lakes and would intersect planned open space in the City of Laguna Beach. The proposed project alignment utilizes a narrow right-of-way between the large Laguna Laurel Dedi- cation Areas north and south of the proposed Corridor. By following such ,an w alignment, the Corridor greatly minimizes impacts on open space areas. s' El -Toro Road. Phase I project alternatives are located in Upper E1 Toro Canyon closer to Leisure World and residential development planned for Sycamore Hills. Location of the Corridor in the northern portions of the E1 Toro drainage would impact larger wetland riparian areas of greater quality than those which would be impacted in the stretches of E1 Toro Canyon under the proposed project alignment. Aliso Creek. The various Phase I alternative alignments of the Cor- ridor would create similar impacts at Aliso Creek as those of the proposed alignment. All alignments would use a bridge to span Aliso Creek. Therefore, long-term impacts to wetland areas would generally be avoided. Oso Creek. Impacts to the Oso Creek wetland resources would not have varied under the Phase I alternatives. Three alternatives in EIR No. 267 were proposed for the Oso Creek area. One of the alignments would cross Paseo De Colinas further to the west and enter San Juan Capistrano south of Avery Park- way. Oso Creek would be bridged as the. Corridor transitions into' I=5. This alignment would directly impact residential areas. The other alignment which was selected as the, preferred alternative crosses Crown Valley Parkway on the north, and gradually approaches I-5 parallel to the existing adjacent residen- tial development, Oso Creek and Camino Capistrano. Oso Creek is bridged in this alternative similar to the other possible alignment further south. A third alternative would cross Oso Creek farther north, but south of Crown Valley Parkway. Oso Creek would be bridged. Commercial properties in the vicinity would be heavily impacted. Phase II Alignment Alternatives The Phase II alternatives consist of refinements of the Phase I alignment. These alternatives which were analyzed in DEI'R No. 494 consist of various mixes of travel lanes, slow lanes, truck usage and climbing lanes. In addition, modifications of the alignment in the Bonita Canyon/Ford Road area were eval- uated which would 1) minimize impacts on Bonita Canyon Reservoir and wetlands within and adjacent to Bonita Creek (Alternative R), or 2) would align the Corridor more southerly into the reservoir to minimize encroachment onto UCI property (Alternative U). The preferred project alignment as analyzed in DEIR No. 494 involved the discharge of fill material in wetlands at the following locations: Bonita Creek, Bonita Canyon Reservoir-, an unnamed creek northeast of the Pelican Hill Road/Culver Drive interchange, wet meadows near Laguna Canyon Road and E1 Toro Road, and Oso Creek. The Corridor bridges San Diego and Aliso Creeks so that �I discharges of fill material into wetlands in these areas would be avoided, however, the shade created by the bridge structures may prevent successful growth of plant materials underneath. La Paz Road and Moulton Parkway Interchanges. DEIR No. 494 also analyzed potential effects of interchange locations at La Paz Road and/or Moulton Park- way, however, neither interchange is near to or affects identified wetland resources. Replacement Site Requirements. Plant communities are classified by the United States Fish and Wildlife Service (USFWS) as a particular Resource Cate- gory having certain habitat value. Moreover, the value of the habitat type is reflected in the mitigation goal and extent of mitigation that is required. The wetland riparian areas are considered to be Resource Category 2 by the USFWS. The applicable mitigation goal required by USFWS is as follows: No net loss of in -kind habitat value. Principal mitigation in Resource Category 2 areas specifies avoidance or minimization of all significant impacts by modify- ing the project. Given the proposed project, complete avoidance is not considered feasible and wetlands impacts are, therefore, unavoidable. Alternative designs for the Corridor cross section as evaluated in DEIR No. 494 would provide narrower medians than those currently proposed and were considered for reduction of impacts to wetlands areas. However, it was determined that the overall benefit from these design alterations would be marginal in terms of wetlands savings. The majority of Resource Category 2 habitat is associated with the Bonita Canyon Reservoir. For example, adjacent to Bonita Canyon Reservoir, a narrower median could provide a savings of a 16 foot -wide section of wetlands, a savings of less than 0.5 acres. The reduced median width would not meet the project objectives for traffic flow and safety operations on the proposed Corridor. Potential Mitigation Areas Eliminated From Further Consideration. There are a few areas along the Corridor route that were initially considered for wetland compensation. However, due to extensive grading, proximity to the Corridor or other reasons, they were eliminated from further consideration. These areas include: a. Upper Laurel Canyon does not contain significant watershed to provide a wetland condition. Additionally, obtaining credit for high value habitat (i.e., significant ecotone) conversion may not be productive, regardless of watershed limitations. b. The area west of Coyote Canyon Road and south of the proposed Corri- dor could potentially be developed as a wetland mitigation area (see Figure 4.7.5 of the current EIR/EIS), however it should not be devel- oped in that manner for the following reasons. The creation and/or expansion of an arroyo willow riparian woodland in this area would require moderate grading in order to widen the existing channel. This proposed grading would require the creation of a larger "wetted section" of channel to allow for the establishment of the willow thickets. This area has been determined to be a poor candidate for 0 sale by the land owner. This area has subse subsequently been dropped from q pP further mitigation analyses. C. Availability of water remains the limiting factor in establishing a larger forested wetland (Salix-dominated) in the lower portion of Laurel Canyon. It appears that a much larger contributing watershed is necessary to provide the necessary soil. moisture reservoir neces- sary to establish and maintain an arroyo willow woodland. d. There is a small low area, along the east side of Laguna Canyon Road near the Corridor which has some potential to establish new wetland. Water from Laguna Creek could,be diverted through the area.. Peren- nial flows are expected to increase as the .upstream areas along Laguna Canyon develop under an already approved plan. However, this area may be impacted by the proposed Laguna Canyon Road and the abil- ity to direct water to the site. e.. Another site considered but rejected is located -along an unnamed drainage running from the Spyglass Hill residential' development down to Bonita Canyon Road. The realignment of Ford Road provides an area between the realignment and the housing that will remain undeveloped. The potential expansion of the drainage in the° undeveloped area was reviewed. The drainage is deeply incised through a hilly area. The site would have to be graded extensively in order to provide sufficient area to expand the existing wetland in the drainage. Based on the expected grading requirements and subsequent land modi- fication, this site was judged to be unsuitable as a mitigation area.. _j Potential Wetland Mitigation Areas Selected For Further Consideration Potential wetland mitigation/compensation sites have been identified along the Corridor. These areas are shown in Figures 4.7.1 through 4.7.5 in Sect ion 4.7 of the EIR/EIS along with the estimated acreage of each area. Figure 4.7.5 specifically depicts areas near Bonita Canyon Reservoir which were considered but judged unsuitable due to the heavy grading required and associated cost., or isolation from other existing wetlands (i..e., within the loop ramp area of the Ford Road interchange). Specific actions that would help to compensate for the wetland losses on - site (i.e. Bonita Canyon) are discussed below. Bonita Creek/San Diego Creek. The agricultural area downstream of Bonita Canyon Reservoir appears to be very promising as an -off -site. -compensation area for unavoidable losses of wetlands at Bonita Canyon (see -Figure 4.'7.4.,) This area is made up of approximately 8.4 acres, includes good substrate for revegetation, is in proximity to the Bonita wetland system and can act as a sediment trap for the Newport Back Bay. A question remains as to whether there is ample water to saturate the system for a duration suitable to support hydrophyte vegetation (i.e., bulrush; willow, mulefat). The growth profile of forested wetland in Bonita Canyon Reservoir provides evidence that there is adequate water which in combination with increased low flow runoff from future urbanization upstream will provide additional available water to this riparian 1 system. Grading adjustments at Bonita Creek can be directed through the area to form a wider low area. The proposed embankment for Bison Avenue will pro- vide a means to control flows to pond or retain surface flows for longer peri- ods. The hydrologic regime after construction needs to be carefully evaluated to determine water availability and drainage setting. Although not as extensive, there is an estimated 2.2 acres available for mitigation just below the Bonita Canyon Reservoir structure (see Figure 4.7.4). The existing stream channel below the dam would need to be expanded to the west and/or have the water back-up to create more significant saturated soil condi- tions for appropriate hydrophytes. This concept expands upon the wetland corridor between Bonita Canyon Reservoir and San Diego Creek. Other areas for potential mitigation within this reach include approxi- mately 1.6 acres along Bonita Canyon Creek at its northerly terminus at Univer- sity Drive (Figure 4.7.4). This area would require grading and a temporary irrigation system to expand upon the willow dominated forested wetland at this site. Although this narrow riparian strip is surrounded by sterile biotic conditions, a continuous wetland condition between San Diego Creek and Bonita Canyon Reservoir helps to create a wetland corridor in that area. Another site in the San Diego Creek area that may be an acceptable mitiga- tion site is along the south side of San Diego Creek channel, south of Bonita Creek. This mitigation site would be close to the existing 0.9 acre site on the northern side of Bonita Creek. The additional site would be approximately 0.4 acre. The additional habitat, though small would enhance the overall habitat in this section of Bonita Creek and augment the potential for wildlife movement. Aliso Creek.. Another suitable area for wetland compensation/mitigation is adjacent to Aliso Creek. Three sites totalling 11.5 acres would expand the arroyo willow woodland along the Creek. A critical depth control device (drop structure, dam, or overflow) could be installed to create a retention area, or impoundment behind the structure. This technique would expand the "wetted section" of channel capable of supporting the willow thickets. Of particular concern in recommending establishment of expanded riparian woodland in flood control areas by this method is consideration of stream dynamics, which not only include water movement in storm events, but sediment transport, and the potential for new erosion as a result of structures placed in the channel. Periodic maintenance of the floodway would also be required (i.e., removing of vegetation). Oso Creek. A 4.8 acre site adjacent to and east of the unimproved natural portion of Oso Creek is a potential area for mitigation of Conventional Alter- native impacts to this wetland area. Development of the mitigation area would include grading the site down to the level of the existing stream channel. In addition, creek flow should be diverted from the impacted wetlands area onto the mitigation site. Stream flow from the mitigation site would them be redi- rected to the improved Oso Creek channel downstream. 0 11 I SPRING 1990 BIOLOGICAL SURVEY RESULTS SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR I L t PREPARED BY LSA ASSOCIATES, INC. 1 PARK PLAZA, SUITE 500 IRVINE, CA 92714 (714) 553-0666 LSA PROJECT #TCA901A July 17, 1990 1 U SPRING 1990 BIOLOGICAL SURVEY RESULTS SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR INTRODUCTION Presented here are the results of spring biol.ogical surveys conducted along the proposed San Joaquin Hills Corridor route in Orange County in 1990. These data are intended to supplement the information provided by P&D Technolo- gies (1988a,-1988b) METHODS The corridor route was surveyed on 24 partial days from May 16 to July 11. Five' people accounted for a total of over 90 person hours in the field. Most work was done in the morning (0600 on), but visits extended nearly throughout the daylight hours (to 1900). Complete details are provided in the appendix. Primary emphasis was on sensitive species, in particular many - stemmed dudleya (Dudleya multicaulis), Orange County Turkish rugging (Chorizanthe staticoides chrysacantha), southwestern pond' turtle (Clemmys marmorata pallida), California gnatcatcher (Polioptila califbrnica), and least Bell's vireo (Vireo bellii pusillus). FINDINGS Special Concern Species Many -stemmed dudleya (Dudleya multicaulis) This is a federal Category 2 Candidate species (indicates the probable appropriateness of listing as rare or endangered, but sufficient information to biologically support a proposed rule is not presently available), and is on the CNPS List 1B. Three areas on the corridor route with known populations of this species were visited. The patches southwest.of the Bonita Canyon Reservoir dam were readily found but separate patches on two knolls northeast of the Bonita Canyon Reservoir dam could not be relocated. New populations were found in seven general areas. About 20 plants were approximately 1,000 feet west of the Laguna Canyon Road interchange on a hill- side overlooking the Canyon. About 15 plants were approximately one mile east of the Sand Canyon Avenue crossing. The largest population found included five 07/19/90(TCA901A\SPRING.RPT) 1 11 n groups totaling about 300 plants immediately north of station 9905, approxi- mately 2,700 feet east of the Sand Canyon Avenue crossing. Two groups totaling about 15 plants were found approximately 500 feet east of the San Canyon Avenue crossing; two groups totaling about 70 plants were at the proposed Sand Canyon Road crossing; about 60 plants were south southwest of Station 9943, 1,000 feet west of Sand Canyon Avenue; and about 20 plants were found among the Chorizanthe population at Station 9957. Orange County Turkish rugging (Chorizanthe staticoides chrysacantha) This species is a Federal Category 2 Candidate Species for threatened/ endangered listing. It is on List lb of the California Native Plant Society. Orange County Turkish rugging is essentially endemic to the San Joaquin Hills. Four new patches of rugging were found this year. The largest group, _ containing hundreds of plants associated with Dudleya multicaulis, was between the Sand Canyon Avenue and San Joaquin Hills Road crossing. The population is located on a slope approximately 2,400 feet west of Sand Canyon Avenue. Sixty more plants were between the Sand Canyon Avenue and San Joaquin Hills Road crossing. The population is located on a knoll approximately 3,000 feet west of Sand Canyon Avenue. The remaining two patches were on the knoll across the road from the Bonita Canyon Reservoir dam. Thirty plants were near the road and about 100 were clustered nearer the peak of the knoll. Monarch butterfly (Danaus plexippus) This species is included on the California Department of Fish and Game Natural Diversity Data Base list of special animals. Monarchs congregate in large numbers in certain areas on the wintering grounds. Favored locations are therefore of particular importance. A the monarch seen near proposed Sand Canyon Avenue crossing on May 25 was part of no such congregation and is of little significance. Southwestern pond turtle (Clemmys marmorata pallida) The southwestern pond turtle is listed as a Category 2 species by the federal government and a Species of Special Concern by the California Depart- ment of Fish and Game. Only one turtle was found, just below the Bonita Canyon Reservoir dam on June 12. 07/19/90MA901A\SPRING.RPT) 2 U I 1 Black -shouldered kite (Elanus caeruleus) This is a California Fully Protected Species. This raptor occurs at lower elevations where it breeds in sites with riparian trees such as oaks, willows, and cottonwoods. Two juveniles at Bonita Canyon Reservoir on July 1 were the first on noted along the corridor route. Where these young were raised'is unknown. A bird of unknown age was soring near the reservoir on July 11. Cooper's hawk (Accipiter cooperi) This medium-sized hawk is listed by'the California Department of Fish and Game as a species of special concern, second priority. . It is an uncommon winter resident of the region, and a rare summer breeder, preferring lower elevation woodlands composed of such tree species as willow, cottonwood, syca- more or oak. An adult was seen at Bonita Canyon Reservoir on July y i it is unlikely this bird nested at the reservoir because no hawks were seen in May and June r despite considerable coverage there. Northern harrier (Circus cyaneus) This hawk is also a second priority species of special concern, indicat- ing that this species is declining in a significant portion of its range within the State, although the threat of extinction or extirpation is less imminent. It is an uncommon and declining wintering species in Southern California and a rare nesting species in summer. A pair of harriers seen between E1 Toro Road and Laguna Canyon Road, on May 18 may have been in the vicinity of a nest. A single bird near the proposed Sand Canyon Avenue crossing on May 25 seemed only to be passing through. Willow flycatcher (Empidonax traillii) This small flycatcher is listed on the first priority list of species of special concern to the California Department of Fish and Game. It occurs throughout coastal Southern California as an uncommon spring, migrant and fairly common fall migrant, generally in riparian areas. Nesting is rare and very local in the region, and extensive willow -riparian woodlands are required. 07/19/90MA90IMSPRING.RPT) 3 i 1 1 Formerly, the species bred extensively throughout the region. Major declines in its preferred breeding habitat and brood parasitism by brown -headed cowbird are believed to have precipitated its rapid decline this century. One on May 29 and two on May 30 at Bonita Canyon Reservoir were consid- ered migrants, despite occasional singing by one bird on May 30 and the pres- ence of seemingly suitable nesting habitat. None were seen on subsequent visits to the area. Cactus wren (Campylorhynchus brunneicapillus) While listed not as rare or endangered, the CDFG has proposed a study of coastal California populations in order to determined their status. These populations are declining at an unknown rate as a result of coastal sage scrub habitat loss. In Southern California this species is resident in coastal sage scrub containing prickly pear cactus. The species is included on the list of special animals being monitored by the California Department of Fish and Game's Natural Diversity Data Base. These wrens were widespread in suitable habitat from the ridge between E1 Toro Road and Laguna Canyon Road to about station 9990, in the canyon northeast of the proposed Culver Drive crossing, and in the vicinity of Bonita Canyon Reservoir. California gnatcatcher (Polioptila californica) This species is a federal Category 2 Candidate species and a second priority species on the California Department of Fish and Game Species of Special Concern list. It is found in San Diego, Riverside and Orange Counties, in coastal sage scrub habitat which generally contains California sagebrush and/or brittlebush as a dominant component. The USFWS is currently compiling new and existing information on this species for a possible listing package in the coming year. Gnatcatchers were found at eight sites along the proposed corridor route. The greatest concentration was observed on the north and west sides of Bonita Canyon Reservoir, an area more intensively covered by us than anywhere else along the route. Up to seven birds were observed there from May 16 to July 1. In addition, single birds were found in typical habitat near stations 9892-9895 on May 21, south southwest of station 9910 on May 22, northeast of station 10,000 on May 25, and near stations 10,117-10,118 on May 29. One bird south- west of station 10,082 on May 29 was in an extensive area of mulefat and a male at the Pelican Hill Road mitigation site south of Bonita Canyon Reservoir 07/19/90MA901AWRING.RPT) 4 [I n W on 17 and 21 May was in a small area of coastal sage scrub being graded for wetland mitigation. Two birds foraging together in ruderal vegetati-on (sweet fennel (Foeniculum vulgare), Australian saltbush (Atriplex semibaccata), Russian thistle (Salsola iberica), sweet clover (Melilotus albus), etc.) near MacArthur Boulevard on July 11 were possibly dispersi-ng juveniles. Least Bell's vireo (Vireo bellii pusillus) This small passerine is listed as endangered by federal and state agen- cies. It breeds in dense riparian habitat with understory and structural diversity. A singing male was observed at Bonita Canyon Reservoir near the dam on May 16. Despite considerable coverage of the area from May 17 to July 1, the bird was never found again. This fits the pattern established in Orange County_ in recent years where no birds have been found to linger for any length of time. Yellow warbler (Dendroica etechia P ) This is a California Department of Fish and Game species of special concern, second priority listing because breeding populations throughout the state have declined markedly. The species remains common as a migrant however. Single birds were seen on May 21, 22,' 25, 29, and 30 along much of the corridor route. All are considered migrants and only those on May 29 and 30 were in potential riparian nesting habitat at Bonita Canyon Reservoir and along Bonita Creek. None were seen on subsequent visits in June and July. Yellow -breasted chat (Icteria vixens) The chat is another second priority listing on the California Department of Fish and Game Species of Special Concern list. Breeding populations are restricted to riparian areas and have declined throughout much of lowland California, especially southern California. Chats were observed at Bonita Canyon Reservoir on May 17 and 29, June 15-, and July 1 and 11. This is a known nesting area for this species 'and it is estimated that one or two pairs were present in 1990. I07/19/90(TCA901A\SPRING.RPT) 5 VASCULAR PLANTS OBSERVED Legend * taxa noted by previous investigators only (see P&D 1988a & 1988b for more detail) + exotic species ° Literature Search PTERIDOPHYTAE Sel agi nel I aceae Selaginella bigelovii Aspidiaceae Dryopteris argutta Polypodiacea Polypodium californicum Adiantaceae * Adiantum jordani * Cheilanthes californica * Notholaena newberryi * Pellaea andromedaefolia * Pellaea mucronata * Pityrogramma triangularis Dennstaedtiaceae * Pteridium aquilinum DICOYTLEDONAE Amaranthaceae + Amaranthus albus + Introduced * P&D Report ° Literature Search 07/19/90MA901A\SPRING.RPT) 6 PTERIDOPHYTES Club -moss Family Bigelow club -moss Wood Fern Family Wood fern Polypody Family California polypody Lip Fern Family Maidenhair fern Lace fern Cotton fern Coffee fern Birds -foot fern Goldenback fern Bracken Fern Family Western bracken fern DICOTYLEDONES Amaranth Family Tumbling pigweed I 1 I Anacardiaceae Rhus integrifolia Malosma laurina + Sch i nus mop e Toxicodendron diversilobum Apiaceae + Apium graveolens * Barula erecta * Bowlesia incana * Caucalis microcarpa + Conium maculatum * Daucus pusillus + Foeniculum vulgare * Osmorhiza brachypoda * Sanicula crassicaulis * Sanicula arguta Apocynaceae *+ Nerium oleander Asclepiadaceae Asclepias californica Asclepias eriocarpa * Asclepias fascicularis Asteraceae Ambrosia psilostachya *+ Anthemis cotula Artemisia californica Artemisis douglasiana Baccharis glutinosa Baccharis pilularis * Brickellia californica * Calycadenia tenella + Centurealmelitensis *+ Centurea repens * Chaenactis glabriuscula + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) Sumac Family Lemonadeberry Laurel sumac Pepper -tree Poison oak Carrot Family Celery Cut -leaved water Bowlesia California hedge Poison -hemlock Rattlesnake weed Sweet fennel Sweet cicily Pacific sanicle Purple sanicle. Dogbane Family Oleander parsnip parsley Milkweed Family California milkweed Indian milkweed Mexican milkweed Sunflower family Western ragweed Mayweed Coastal sagebrush California mugwort Mulefat Coyote bush California brickelbush Rosin weed Tocalote Napa thistle Yellow chaenactis 1 1 * Chaetopappus aurea * Cirsium occidentale + Cirsium vulgare + Conyza canadensis Corethrogyne filaginifolia *+ Cotula australis Cotula coronopifolia + Cynara cardunculus Encelia californica * Erigeron foliosus Eriophyllum confertiflorum * Filago californica *+ Filago gallica * Gnaphalium bicolor Gnaphalium californicum * Gnaphalium chiiense Gnaphalium microcephalum * Gnaphalium palustre Grindelia robusta * Haplopappus palmeri Haplopappus pinifolius Haplopappus squarrosus Haplopappus venetus Helianthus annuus * Hemizonia australis * Hemizonia fasciculata Hemizonia ramosissima Heterotheca grandiflora *+ Hypochoeris glabra *+ Lactuca serriola * Lasthenia chrysostoma * Matricaria matricariodes * Micropus californicus * Microseris )inearifolia * Perezia microcephala *+ Picris echioides * Rafinesquia californica * Senecio californicus + Introduced * P&D Report ° Literature Search Golden chaetopappa Cobweb thistle Bullthistle Horseweed Common corethrogyne Australian brass -buttons Common brass -buttons Cardoon Bush sunflower Leafy daisy Golden yarrow California fluffweed Narrow -leaved fluffweed Bicolored -leaf cudweed California everlasting Cotton batting plant White everlasting Lowland cudweed Gum -plant Palmer's goldenbush Pine goldenbush Saw-toothed goldenbush Coastal goldenbush Common sunflower Southern spikeweed Fascicled tarweed Slender tarweed Telegraph weed Smooth cat's-ear Prickly lettuce Goldfields Pineapple weed California cottonweed Uropappus Sacapellote Bristly ox tongue California chickory California butterweed 1 n 1 1 17, LI C� fl a I 1 1 07/19/90 MA901A\SPRING.RPT) 8 1 1 I *+ Silybum marianum Milk thistle *+ Solidago californica California goldenrod' + Sonchus asper Prickly sow thistle *+ Sonchus oleraceus Common sow thistle * Stephanomeria virgata Tall stephanomeria *+ Xanthium spinosum Spiny clotbur *+ Xanthium strumarium Cocklebur Boraginaceae Borage family Amsinckia intermedia Common fiddleneck Cryptantha intermedia White forget-me-not * Cryptantha muricata Prickly cryptantha Heliotropium curassavicum Salt heliotrope * Pectocarya Iinearis Slender pectocarya * Plagiobothrys californicus California popcorn flower * Plagiobothrys nothofulvus Popcorn flower Brassicaceae Mustard Family + Brassica campestri.s Field mustard + Brassica geniculata, Short -podded mustard + Brassica nigra Black mustard *+ Capsella bursa-pastoris Sheperd's purse Lepidium nitidum Common peppergrass * Lepidium virginicum Virginia peppergrass + Raphanus sativa Wild radish * Rorippa nasturtium-aquaticum Water -cress *+ Sisymbrium officinale Hedge mustard * Thelypodium lasiophylum California mustard Cactaceae Cactus Family *+ Opuntia ficus-indica Indian fig *+ Opuntia occidentalis Western prickly pear Opuntia littoralis Coastal prickly pear * Opuntia oricola Oracle cactus Opuntia prolifera Coast cholla + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 9 1 Campanulaceae * Triodanis biflora Capparaceae Isomeris arborea Caprifoliaceae Sambucus mexicana * Symphoricarpos mollis Caryophyllaceae * Cardionema ramosissimum + Silene gallica Silene laciniata *+ Spergularia villosa + Stellaria media Ceratophyllaceae * Ceratophyllum demersum Chenopodiaceae + Atriplex semibaccata *+ Beta vulgaris + Chenopodium album *+ Chenopodium ambrosiodes * Chenopodium californicum *+ Chenopodium murale + Salsola iberica Cistaceae Helianthemum scoparium Convolvulaceae Calystegia macrostegia *+ Convolvulus arvensis * Dichondra occidentalis + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 10 Bellflower Family Venus looking -glass Caper Family Bladderpod Honeysuckle Family Mexican elderberry Creeping snowberry Pink Family Sand mat Windmill pink Fringed Indian pink Villous sand-spurrey Common chickweed Hornwort Family Hornwort Goosefoot Family Australian saltbush Sugar beet Lamb's -quarters Mexican tea California goosefoot Nettle -leaved goosefoot Russian thistle Rock -Rose Family Common rock -rose Morning-glory Family Western bindweed Field bindweed Western dichondra E 1 i Crassulaceae * Crassula erecta Dudleya lanceolata Dudleya multicaulis Dudleya pulverulenta * Dudleya stolonifera Cucurbitaceae Cucurbita foetidissima Marah macrocarpus Elatinaceae * Elatine sp. Euphorbiaceae Eremocarpus setigerus Euphorbia albomarginata *+ Euphorbia maculata *+ Euphorbia peplus + Ricinus communis Fabaceae *+ Lotus corniculatus * Lotus hamatus * Lotus purshianus * Lotus scoparius Lupinus bicolor * Lupinus densiflorus * Lupinus hirsutissimus * Lupinus longifolius * Lupinus sparsiflorus * Lupinus succulentus * Lupinus •truncatus *+ + Medicago polymorpha Melilotus albus + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 11 Stonecr,op Family Dwarf stonecrop Lance -leaved dudleya Many -stemmed dudleya Chalk lettuce Laguna Beach dudleya Gourd Family Calabazilla Wild cucumber Waterwort Family Waterwort Spurge Family Dove weed Rattlesnake weed Spotted spurge Petty spurge Castor -bean Pea Family Bird's -foot trefoil San Diego hosackia Spannish clover Deerweed Lindley's annual lupine Dense -flowered platycarpos Nettle annual lupine Watson's bush -lupine Loosely -flowered annual lupine Succulent annual lupine Nuttall's annual lupine Bur -clover White sweet -clover 1 + Melilotus indicus * Trifolium tridentatum Yellow sweet -clover Tomcat clover Fagaceae Beech Family Quercus agrifolia Coast live oak Quercus hybrid (dumosa X engelmanii "Scrub" oak X lobata X wislizenii) Frankeniaceae * Frankenia grandifolia Geraniaceae *+ Erodium botrys + Erodium cicutarium *+ Erodium moschatum * Geranium carolinianum Hydrophyllaceae * Eucrypta chrysanthemifolia Phacelia circutaria * Phacelia distans Phacelia parryi Phacelia ramosissima * Pholistoma auritum Lamiaceae + Marrubium vulgare Salvia apiana * Salvia columbariae Salvia mellifera * Stachys rigida * Tricostema lanceolatum Lythraceae * Lythrum hyssopifolia * Lythrum californicum + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 12 Frankenia Family Alkali heath Geranium Family Board -lobed filaree Red -stemmed filaree White -stemmed filaree Carolina geranium Waterleaf Family Common eucrypta Caterpillar phacelia Wild heliotrope Parry's phacelia Branching phacelia Blue fiesta flower Mint Family Horehound White sage Chia Black sage Rigid hedge -nettle Vinegar weed Loosetrife Family Grass poly California loosetrife I Malvaceae Mallow family * Malacothamnus fasciculatus Mesa bushmallow + Malva parviflora Cheeseweed * Sida leprosa Alkali -mallow Moraceae Mulberry family + Morus alba White mulberry Myrtaceae Myrtle Family + Eucalyptus globulus Blue gum Nyctaginaceae Four-o'clock Family * Mirabilis californica Wishbone bush Onagraceae Evening -primrose Family Camissonia bistorta Southern sun -cup * Clarkia purpurea * Epilobium adenocaulon Winecup clarkia California cottonweed * Zauschneria californica California fuchsia Paeoniaceae Peony Family, * Paeonia californica California peony Papaveraceae Poppy Family Eschscholzia californica California poppy Plantaginaceae Plantain Family Plantago erecta California plantain *+ Plantago lanceolata English plantain *+ Plantago major Common plantain Platanaceae Sycamore Family Platanus racemosa California sycamore Polemoniaceae Phlox Family * Eriastrum sapphirinum Sapphire eriastrum * GiH a angelensis Angelen gilia * Linanthus dianthiflorus Ground -pink + Introduced * P&D Report ° Literature Search I07/19/90(TCA901A\SPRING.RPT) 13 F1 Polygonaceae * Chorizanthe coriacea * Chorizanthe procumbens Chorizanthe staticoides * Eriogonum elongatum Eriogonum fasciculatum * Eriogonum gracile * Polygonum avicultare * Polygonum lapathifolium * Pterostegia drymarioides + Rumex crispus * Rumex salicifolius Claytonia perfoliata *+ Portulaca oleracea Primulaceae + AnagalTis arvensis * Dodecatheon clevelandii Ranunculaceae * Ranunculus californicus Rhamnaceae Rhamnus ilicifolia Rosaceae Adenostoma fasciculatum * Cercocarpus betu)oides Heteromeles arbutifolia * Potentilla glandulosa Rosa californica * Rubus ursinus Rubiaceae * Galium angustifolium *+ Galium aparine * Galium nutta7lii + Introduced * P&D Report ° Literature Search 07/19/90 MA90IMSPRING APT) 1 1 1 Buckwheat family Lastarriaea Prostrate spineflower Orange County Turkish rugging Long-stemmed eriogonum California buckwheat Slender wooly eriogonum Common knotweed Nodding smartweed Pterostegia Curly dock Willow dock Miner's -lettuce Purslane Primrose Family Scarlet pimpernel Shooting star Crowfoot Family California buttercup Buckthorn Family Holly -leaved redberry Rose Family Chamise Mountain-mohogany Toyon Sticky cinquefoil Wild rose California blackberry Madder Family Narrow -leaved bedstraw Goose grass Nuttall's bedstraw 14 1 Salicaceae Salix gooddingii * Salix lasiandra Salix lasiolepis Saururaceae * Anemopsis californica Saxifragaceae * depsonia parryi * Lithophragma affine Ribes speciosum Scrophulariaceae Antirrhinum nuttallianum Castil)eja affinis * Keckiella cordifolia + Kicksia elatine * Linaria canadensis Mimulus aurantiacus Mimulus guttatus * Mimulus pilosus * Mimulus puniceus Orthocarpus purpurascens Scrophularia californica Solanaceae Datura meteloides * Nicotiana bigelovii Nicotiana glauca Solanum douglasii + Solanum nodiflorum * Solanum umbelliferum Tamaricaceae MK *+ Tamarix aphylla + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 15 Willow Family Black willow Golden willow Arroyo willow Lizard -tail Family Yerba mansa Saxifrage Family Mesa saxifrage Woodland -star Fuchsia -flowered gooseberry Figwort Family Nuttall's snapdragon Coast Indian paint -brush Climbing penstemon Fluellin Smaller blue toad -flax Orange bush monkey -flower Yellow monkey -flower Downy mimetanthe Red bush monkey -flower Owl's -clover California bee plant Nightshade Family Jimson weed Indian tobacco Tree tobacco Douglas' nightshade Small -flowered nightshade Blue witch Tamarisk Family Athel 1 Urticaceae * Parietaria floridana Urtica holosericea *+ Urtica wrens Verbenaceae Verbena lasiostachys Violaceae * Viola pedunculata Viscaceae * Phoradendron tomentosum + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 16 Nettle Family Pellitory Creek nettle Dwarf nettle Vervain Family Western verbena Violet Family Johnny jump-up Mistletoe Family Greenleaf mistletoe L I MONOCOTYLEDONAE MONOCOTYLEDONES Alismataceae Water-plantai-n Family * Echinodorus berteroi Upright bur -head Amaryllidaceae Amaryllis Family * Allium praecox Bloomeria crocea Spring wild onion Golden stars Dichelostemma pulchella Blue dicks Cyperaceae Sedge Family * Carex praegracilis Clustered field sedge Cyperus eragrostis Umbrella sedge * Eleocharis macrostachya Common spike-rush * Eleocharis montevidensis Slender creeping spike-rush * Scirpus americanus * Scirpus californicus American three -square Tule * Scirpus olneyi Olney bulrush * Scirpus robustus Alkali bulrush * Scirpus validus Soft -stemmed bulrush Iri'daceae Iris Family Sisyrinchium bellum Blue -.eyed grass Juncaceae Rush Family * Juncus balticus * Juncus bufonius Wire rush Toad rush * Juncus mextcanus Mexican rush * Juncus rugulosus Wrinkled rush * Juncus xiphioides Iris-leaved.rush Lemnaceae Duckweed Family i * Lemna minor Water lentil + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 17 1 I 1 L7 Liliaceae Lily Family Calochortus catalinae Catalina mariposa lily * Calochortus splendens Lilac mariposa lily * Calochortus weedii Weed's mariposa lily Chlorogalum pomeridianum Soap plant Najadaceae Water -nymph Family * Najas guadalupensis Common water -nymph Poaceae Grass Family * Agrostis diegoensis Leafy bentgrass * Aristida purpurea Purple three -awn + Arundo donax Giant reed + Avena barbata Slender wild oat + Avena fatua Common wild oat * Bothriochloa barbinodis Beard -grass *+ Brachypodium distachyon Brachypodium + Bromus diandrus Ripgutgrass + Bromus mollis Soft chess + Bromus rubens Red brome *+ Cynodon dactylon Bermudagrass Distichlis spicata Saltgrass *+ Echinochioa crusgalli Watergrass Elymus condensatus Giant wild rye * Elymus triticoides Alkali wild rye Festuca megalura Foxtail fescue *+ Gastridium ventricosum Nitgrass + Hordeum vulgare Common barley * Koeleria micrantha June grass *+ Lamarckia aurea Goldentop * Leptochloa uninervia Sprangletop + Lolium multiflorum Italian ryegrass * Melica imperfecta Small flowered melica * Muhlenbergia microsperma Annual muhlenbergia * Oryzopsis miliacea Millet mountain -rice * Paspalum distichum Knotgrass + Pennisetum setaceum Fountain grass *+ Phalaris aquatica Harding grass + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 18 , L\ I L *+ Phalaris minor Canary -grass * Poa scabrella Malpais bluegrass + Polypogon monspeliensis Rabbit's -foot grass *+ Polypogon semiverticillatus Waterbent + Schismus barbatus Schismus grass *+ Setaria geniculata Perennial brist.Tegrass * Stipa coronata Crested needlegrass * Stipa lepida Foothill needlegrass Stipa pulchra Purple needlegrass Potamogetonaceae Pondweed Family * Potamogeton pectinatus Fennel -leaved pondweed 1 Typhaceae Cattail Family * Typha angustifolia Narrow -leaved cat -tail * Typha domengensis Southern cat -tail Typha latifolia Broad-leaved cat -tail Nomenclature follows Munz (1974); common names are from Abrams (1940-60), when unavailable in Munz + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 19 ANIMALS OBSERVED Legend * taxa noted by previous investigators only (see P&D 1988a & 1988b for more detail; winter wren and northern waterthrush fide D.R. Willick) + exotic species LEPIDOPTERAE BUTTERFLIES Papilionidae Swallowtails and Parnassians Papilio eurymedon Pale swallowtail Papilio rutulus Western tiger swallowtail Papilio zelicaon Anise swallowtail Pieridae Anthocaris sara + Pieris rapae Danaidae Danaus plexippus Satyridae Coenonympha california Nymphalidae Cynthia annabella Cynthia cardui Euphydryas chalcedona Nymphalis antiopa * Precis Lavinia * Vanessa atalanta Riodinidae Apodemia mormo + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 20 Whites and Sulphurs Sara orange -tip Cabbage butterfly Milkweed Butterflies Monarch Satyrs and Wood Nymphs California ringlet Brush -footed Butterflies West coast lady Painted lady Chalcedon checkerspot Morning cloak Buckeye Red admiral Metalmarks Mormon metalmark E i Lycaenidae Brephidium exilis Incisa-lia augustinus Leptotes marina Plebejus acmon Strymon melinus Hesperiidae. species unknown PISCES Cyprinidae + Pimephales promelas + Notropis lutrensis Poeciliidae + Gambusia affin-is 'AMPHIBIA Pl'ethedontidae * Aneides lugubris * Batrachoseps attenuatus Bufonidae * Bufo boreas Hylidae * Hyla regilla Ranidae *+ Rana catesbeiana Pipidae + Xenopus laevis + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 21 Gossamer -winged Butterflies Pygmy blue Western elfin Marine blue Acmon blue Common hairstreak True Skippers Skipper FISH Minnows Fathead minnow Red shiner Livebearers Mosquitofish AMPHIBIANS Lungless Salamanders Arboreal salamander California slender salamander True Toads Western toad Treefrogs and Allies Pacific treefrog True Frogs Bullfrog Tongueless Frogs African clawed frog 1 REPITILIA Emydidae Clemmys marmorata Iguanidae Sceloporus occidentalis * Uta stansburiana * Phrynosoma coronatum Scincidae * Eumeces skiltonianus Tei i dae * Cnemidophorus hyperythrus Cnemidophorus tigris Anguidae * Gerrhonotus multicarinatus Leptotyphlopidae * Leptotyphlops humilis Colubridae * Diadophis punctatus * Coluber constrictor Masticophis flagellum * Masticophis lateralis Pituophis melanoleucus * Lampropeltis getulus * Rhinochei1us lecontei * Thamnophis sirtalis * Tantilla planiceps * Trimorphondon biscutatus + Introduced * P&D Report ° Literature Search 07/19/90(TCA901MSPRING.RPT) 22 REPTILES Box and Water Turtles Southwestern pond turtle Iguanids Western fence lizard Side -blotched lizard San Diego horned lizard Skinks Western skink Whiptails and Allies Orange -throated whiptail Western whiptail Alligator Lizards and Allies Southern alligator lizard Slender Blind Snakes Western blind snake Col ubrids Ringneck snake Racer Coachwhip California whipsnake Gopher snake Common kingsnake Long -nosed snake Common garter snake California black -headed snake Lyre snake 1 Viperidae * Crotalus ruber * Crotalus mitchelli * Crotalus viridis AYES Ardeidae * Ardea herodias * Butorides striatus Anatidae * Anas platyrhynchos Cathartidae Cathartes aura Acciptridae Elanus caeruleus Circus cyaneus * Accipiter striatus Accipiter cooperii * Buteo ]ineatus Buteo jamaicensis * Buteo regaiis * Aquila chrysaetos Falconidae Falco sparverius * Falco mexicanus Phasianidae Callipepla californica Rall'idae * Rallus limicola * Porzana carolina + Introduced * P&D Report ° Literature Search 07/19/90MA901A\SPRING APT) 23 Vipers Red diamond rattlesnake Speckled rattlesnake Western rattlesnake BIRDS Bitterns and -Herons Great blue heron Green -backed heron Swans, Geese and Ducks Mallard American Vultures Turkey vulture Kites, Hawks, Eagles and Allies Black -shouldered kite Northern harrier Sharp -shinned hawk Cooper's hawk Red -shouldered hawk Red-tailed hawk Ferruginous hawk Golden eagle Caracaras and Falcons American kestrel Prairie falcon Quails, Partidges and Pheasants California quail Rails, Gallinules and Coots Virginia rail Sora 1 Charadriidae Charadrius vociferous Scolopacidae * Totanus melanoieucus * Galinaga gallinago Columbidae + Columba livia Zenaida macroura Cuculidae Geococcyx californianus Tytonidae Tyto alba Strigidae Bubo virginianus Caprimulgidae * Phalaenoptilus nuttallii Apodidae Aeronautes saxatalis Trochilidae Archilochus alexandri Calypte anna Calypte costae Selasphorus sasin Alcidinidae * Ceryle alcyon + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 24 Plovers and Lapwings Killdeer Sandpipers, Phalaropes and Allies Greater yellowlegs Common snipe Pigeons and Doves Rock dove Mourning dove Cuckoos, Roadrunners and Anis Greater roadrunner Barn Owls Barn owl Typical Owls Great horned owl Goatsuckers Common poorwill Swifts White -throated swift Hummingbirds Black -chinned hummingbird Anna's hummingbird Costa's hummingbird Allen's hummingbird Kingfishers Belted kingfisher I Picidae Melanerpes formicivorus * Sphyrapicus ruber (formerly varius in part) Picoides nuttalli Picoides pubescens * Colaptes auratus Tyrannidae Contopus sordidulus Empidonax traillii * Empidonax hammondii Empidonax difficilis Sayornis nigricans * Sayornis saya Myarchus cinerascens Tyrannus vociferans Tyrannus verticalis Alaudidae Eremophila alpestris Hirundinidae * Tachycineta bicolor * Tachycineta thalassina Stelgidopteryx serripennis Hirundo pyrrhonota Hirundo rustica Corvidae Aphelocoma coerulescens * Corvus brachyrhynchos Corvus corax 1 + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 25 Woodpeckers Acorn woodpecker Red -breasted sapsucker Nuttall's woodpecker Downy woodpecker Northern flicker Tyrant flycatchers Western wood -pewee Willow flycatcher Hammond's flycatcher Pacific -slope flycatcher Black phoebe Say's phoebe Ash -throated flycatcher Cassin's kingbird Western kingbird Larks Horned lark Swallows Tree swallow Violet -green swallow Northern rough -winged swallow Cliff swallow Barn swallow Jays, magpies and crows Scrub jay American crow Common raven 1 1 Paridae Titmice and Chickadees Parus inoratus Plain titmouse Aegithalidae Bushtits Psaltriparus minimus Bushtit Troglodytidae Wrens Campylorhynchus brunneicapillus Cactus wren * Salphinctes obsoletus Rock wren Catherpes mexicanus Canyon wren Thryomanes bewickii Bewick's wren Troglodytes aedon House wren * Troglodytes troglodytes Winter wren * Cistothorus palustris Marsh wren Muscicapidae Muscicapids * Regulus calendula Ruby -crowned kinglet * Polioptila caerulea Blue -gray gnatcatcher Polioptila californica California gnatcatcher * Sialia mexicana Western bluebird Catharus ustuiatus Swainson's thrush * Catharus guttatus Hermit thrush * Turdus migratorius American robin * Ixoreus naevius Varied thrush Chamaea fasciata Wrentit Mimidae Mimic thrushes Mimus polyglottos Northern mockingbird * Oreoscoptes montanus Sage thrasher Toxostoma redivivum California thrasher Motacillidae Wagtails and Pipits * Anthus spinoletta Water pipit Bombycilidae Waxwings * Bombycilla cedrorum Cedar waxwing + Introduced * P&D Report ° Literature Search 1 1 1, l [71 1 07/19/90(TCA901A\SPRING.RPT) 26 1 1 li L I F 1 I 1 Ptilogonatidae Phainopepla nitens Laniidae Lanius ludovicianus Sturnidae + Sturnus vulgaris Vireonidae Vireo bellii Vireo solitarius Vireo huttoni Vireo gilvus Emberizidae Vermivora celata * Vermivora ruficapilla Dendroica petechta * Dendroica coronata * Dendroica nigrescens Dendroica townsendi * Dendroica occidentalis * Mniotilta varia * Seiurus noveboracensis Oporornis tolmiei Geothlypis trichas Wilsonia pusilla Icteria virens * Piranga ludoviciana Pheucticus melanocephalus Guiraca caerulea * Passerina amoena Pipilo erythrophthalmus Pipilo crissalis Aimophila ruficeps + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 27 Sil-ky flycatchers Phainopepla Shrikes Loggerhead shrike Starlings European starling Vireos Least Bell's vireo - Solitary vireo Hutton's vireo Warbling -vireo Emberizids Orange -crowned warbler Nashville warbler Yellow warbler Yellow-rumped warbler Black -throated Gray warbler Townsend',s warbler. Hermit warbler Black -and -white warbler Northern waterthrush MacGillivray's warbler Common yellowth.roat Wilson's warbler Yellow -breasted chat Western tanager Black -headed grosbeak Blue grosbeak Lazuli bunti-ng Rufous -sided towhee California towhee Rufous -crowned sparrow ,7 u * Spizella passerina Chondestes grammacus * Passercuius sandwichensis * Ammodramus savannarum * Passerella iliaca Melospiza melodia * Melospiza lincolnii * Zonotrichia atricapilla * Zonotrichia leucophrys * Junco hyemalis Agelaius phoeniceus * Agelaius tricolor Sturnel)a neglecta Euphagus cyanocephalus Molothrus ater Icterus cucul)atus Icterus galbula Fringillidae Carpodacus mexicanus * Carduelis pinus Carduelis psaltria * Carduelis ]awrencei Carduelis tristis Passeridae *+ Passer domesticus MAMMALIA Didelphidae *+ Didelphis virginia Soricidae * Sorex ornatus * Notiosorex crawfordi + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 28 Chipping sparrow Lark sparrow Savannah sparrow Grasshopper sparrow Fox sparrow Song sparrow Lincoln's sparrow Golden -crowned sparrow White -crowned sparrow Dark -eyed junco Red -winged blackbird Tricolored blackbird Western meadowlark Brewer's blackbird Brown -headed cowbird Hooded oriole Northern oriole Finches House finch Pine siskin Lesser goldfinch Lawrence's goldfinch American goldfinch Old World Sparrows House sparrow MAMMALS Opossums Opossum Shrews Ornate shrew Desert shrew 1 Leporidae * Sylvilagus bachmani Sylvilagus aububonii * Lepus californicus Sciuridae Spermophilus.beecheyi Geomyidae * Thomomys bottae Heteromyidae * Perognathus longimembris * Perognathus fallax * Dipodomys agilis Cricetidae * Reithrodontomys megalotis * Peromyscus eremicus ' * Peromyscus californicus * Peromyscus maniculatus * Peromyscus boylii * Neotoma lepida * Neotoma fuscipes * Microtus californicus Muridae *+ Mus musculus Canidae Canis latrans * Urocyon cinereoargenteus Bassariscidae * Bassariscus astutus + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 29 Hares and Rabbits Brush rabbit Desert cottontail Black -tailed hare Squirrels Beechey ground squirrel Pocket Gophers Botta pocket gopher Pocket Mice, Kangaroo Mice,, and Kangaroo Rats Little pocket mouse San Diego pocket mouse Pacific kangaroo rat Mice, Rats, Lemmings-, and Voles Western harvest mouse Cactus mouse California mouse Deer mouse Brush mouse Desert woodrat Dusky -footed woodrat California vole Old World Rats and Mice House mouse Dogs, Wolves, and Foxes Coyote Gray fox RingtaiIs Ringtail 1 Procyonidae * Procyon lotor Mustelidae * Mustela frenata * Taxidea taxus * Spilogale gracilis * Mephitis mephitis Felidae Lynx rufus Equidae *+ Equus caballus Bovidae + Bos taurus Cervidae Odocoileus hemionus + Introduced * P&D Report ° Literature Search 07/19/90(TCA901A\SPRING.RPT) 30 Raccoons and Coatis Raccoon Weasels, Skunks, and Allies Long-tailed weasel Badger Spotted skunk Striped skunk Cats Bobcat Horses, Burros, and Zebras Horse Cattle, Sheep, Old World Antelopes, and Goats Domestic cattle Elk, Moose, Caribou, and Deer Mule deer I LITERATURE CITED I Abrams, L. 1940-60. Illustrated Flora of the Pacific States, in four volumes. Stanford Univ. Press, Stanford, California. ' Munz, P.A. 1974. A Flora of Southern California. Univ. of California Press, Berkeley. P&D Technologies. 1988a. San Joaquin Hills Transportation Corridor, Biological Resource Analysis. P&D Technologies. 1988b. San Joaquin Hills Transportation Corridor, Spring 1988 Biological Survey Results. 1 1 1 L I 1 07/19/90MA901A\SPRING.RPT) 31 1 APPENDIX The corridor route was surveyed in May, June, and July 1990 by Richard Erickson (RE), Robert Fisher (RF), Robb Hamilton (RH), Glenn Kerns (GK), and Bill O'Connell (BO) as indicated below. 16 May brief visit (45-60 min. in early afternoon) to Bonita Canyon Reservoir dam and vicinity - RE,RH,BO 17 May incidental observations made in the vicinity of Bonita Canyon Reservoir (1030-1300, 1500-1730) - BO brief search (1815-1830) for least Bell's vireo at Bonita Canyon Reservoir - RE,RH 18 May surveyed from El Toro Road crossing to about station 9860 (1000-1800) - RE,RH,BO 19 May brief search (30 minutes in late morning) for least Bell's vireo at Bonita Canyon Reservoir - RE, Brian Daniels, Loren Hays 21 May surveyed from about station 9860 to about station 9900 (1200-1730) - RE incidental observations in the vicinity of Bonita Canyon Reservoir (1230-1430) - BO surveyed the proposed Culver Drive crossing (1430-1730) - BO 22 May surveyed from about station 9900 to the proposed Sand Canyon Avenue crossing (1000-1530) - RE incidental observations in the vicinity of Bonita Canyon Reservoir (1030-1130) - BO 25 May surveyed from the proposed Sand Canyon Avenue crossing to the proposed Pelican Hill Road crossing (0600-1400) - RE 29 May surveyed from the proposed Pelican Hill Road crossing to MacArthur Boulevard (0900-1430) - RE 07/19/90(TCA901A\SPRING.RPT) 32 I incidental observations in the vicinity of Bonita Canyon Reservoir (1100-1300) - BO 30 May least Bell's vireo search and incidental observations at Bonita Canyon Reservoir (0730-1100) - RE 1 June southwestern pond turtle survey and incidental observations on Bonita Creek (1400-1530) - BO 5 June surveyed nesting birds between Bonita Canyon Reservoir and MacArthur Boulevard (1300-1500) - BO 6 June surveyed nesting birds near MacArthur Boulevard (1815-1845) - BO 8 June least Bell's vireo search and incidental observations at Bonita 1 Canyon Reservoir (0630-0930) - RE surveyed nesting birds near MacArthur Boulevard (0930-1300) - RE,BO ' 10 June southwestern pond turtle survey and incidental observations on Bonita Creek (1200-1900) - RF,GK 11 June southwestern pond turtle survey and incidental observations -on Bonita Creek (0800-1730) - RF,GK ' 12 June southwestern pond turtle survey and incidental observations on Bonita Creek (1200-1900) - RF,GK,BO 15 June least Bell's vireo search and incidental observations at Bonita Canyon Reservoir (0630-0730) - RE incidental observations in the vicinity of Bonita Canyon Reservoir (0800-0900) - BO 19 June incidental observations in the vicinity of Bonita Canyon Reservoir (1030-1100) - BO 20 June surveyed nesting birds near MacArthur Boulevard (0615-0700) - BO 26 June incidental observations near MacArthur Boulevard (0745-0900 & 1000-1100) - BO 1 07/19/90(TCA901A\SPRING.RPT) 33 1 July incidental observations at Bonita Canyon Reservoir (0800-0900) - RE, Tom Schulenberg 3 July surveyed nesting birds near MacArthur Boulevard (0800-0900 & 1000- 1030) - BO 10 July surveyed nesting birds near MacArthur Boulevard (0755-0855 & 1000- 1015) - BO ' 11 July surveyed nesting birds near MacArthur Boulevard (0730-0830) - RE, BO least Bell's ' vireo search and incidental observations at Bonita Canyon Reservoir (0835-0915) - RE,BO 07/19/90(TCA901A\SPRING.RPT) 34 11 [I J [1 'J L I'l