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Home My WebLink About20210406_WQHP_3-25-2021Lot 8, Block E Water Quality and Hydrology Plan PRELIMINARY (WQHP) Project Name: STEIN RESIDENCE Prepared for: 6th Street Ventures, LLC Contact: Steve Stein 6501 & 6503 Seashore Drive Newport Beach, CA 92663 Tel: (714) 681-5003 Prepared by: Toal Engineering, Inc. 139 Avenida Navarro San Clemente, CA 92672 Tel: (949) 492-8586 ______________________ Adam L. Toal R.C.E 59275 Date Prepared: 03/25/21 JN 21032 PA2021-078 Stein Residence Page i 21032-WQHP.doc This Water Quality and Hydrology Plan (WQHP) has been prepared for Steve Stein by Toal Engineering, Inc. The WQHP is intended to comply with the requirements of the City of Newport Beach Municipal Code Section 21.35.050 requiring the preparation of the plan. The undersigned, while it owns the subject property, is responsible for the implementation of the provisions of this plan , including the ongoing operation and maintenance of all best management practices (BMPs), and will ensure that this plan is amended as appropriate to reflect up-to-date conditions on the site consistent with the current Orange County Drainage Area Management Plan (DAMP) and the intent of the non-point source NPDES Permit for Waste Discharge Requirements for the County of Orange, Orange County Flood Control District and the incorporated Cities of Orange County within the Santa Ana Region. Once the undersigned transfers its interest in the property, its successors-in-interest shall bear the aforementioned responsibility to implement and amend the WQHP. An appropriate number of approved and signed copies of this document shall be available on the subject site in perpetuity. Owner: Title Steve Stein Company 6th Street Ventures, LLC. Address 6501 & 6503 Seashore Dirve, Newport Beach, CA 92663 Email N/A Telephone #714-681-5003 I understand my responsibility to implement the provisions of this WQHP including the ongoing operation and maintenance of the best management practices (BMPs) described herein. Owner Signature Date Project Owner’s Certification Planning Application No. (If applicable)N/A Grading Permit No. N/A Tract/Parcel Map and Lot(s) No. Lot 8 Block E Seashore Colony Tract Building Permit No. N/A Address of Project Site and APN (If no address, specify Tract/Parcel Map and Lot Numbers) 6501 & 6503 Ocean Front, Newport Beach APN 045-092-03 4/5/2021~ ~ ~ ~ ~ /__,/ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Page ii 21032-WQHP.doc Contents Page No. Section I Permit(s) and Water Quality Conditions of Approval or Issuance ........... 1 Section II Project Description .................................................................................. 3 Section III Site Description ...................................................................................... 7 Section IV Best Management Practices (BMPs) ...................................................... 10 Section V Inspection/Maintenance Responsibility for BMPs ................................. 29 Section VI BMP Exhibit (Site Plan) ......................................................................... 35 Section VII Educational Materials ............................................................................ 38 Attachments Attachment A . .........................................................................................BMP Fact Sheets Attachment B . ................................................................................. Educational Materials Attachment C . .............................................................................................. Location Map Attachment D . .................................................................. Operation & Maintenance Plan Attachment E . ..................................................... Kristar Flogard Filter Insert Spec Sheet PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section I 21032-WQHP.doc Page 1 Section I Permit(s) and Water Quality Conditions of Approval or Issuance Project Information Permit/Application No. (If applicable) N/A Grading or Building Permit No. (If applicable) N/A Address of Project Site (or Tract Map and Lot Number if no address) and APN 6506 Ocean Front, Newport Beach, CA 92663 Lot 4 Block E, Seashore Colony Tract APN 045-092-07 Water Quality Conditions of Approval or Issuance Water Quality Conditions of Approval or Issuance applied to this project. (Please list verbatim.) Water Quality and Hydrology Plan required by Section 21.35.010.B.2 of the Newport Beach Municipal Code states: Water Quality and Hydrology Plan. A Water Quality and Hydrology Plan (WQHP; see Section 21.35.050) shall be required for development that requires a coastal development permit, has the potential for adverse water quality or hydrologic impacts to coastal waters, and is a development of water quality concern (see Section 21.35.050(A)). Developments of water quality concern are specified categories of development that have a greater potential for adverse water quality and hydrologic impacts due to the development’s size, type of land use, and/or proximity to coastal waters. The WQHP shall be prepared by a qualified licensed professional, and shall include a polluted runoff and hydrologic site characterization, a sizing standard for BMPs, use of a low impact development (LID) approach to retain the design storm runoff volume on site, and documentation of the expected effectiveness of proposed BMPs. Additional plan components that may be required include an alternatives analysis, and a description of the treatment control and/or runoff control BMPs the development will implement to minimize potential post- development water quality and hydrologic impacts. (Ord. 2016-19 § 9 (Exh. A)(part), 2016) PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section I 21032-WQHP.doc Page 2 Conceptual WQHP Was a Conceptual Water Quality and Hydrology Plan previously approved for this project? No. Watershed-Based Plan Conditions Provide applicable conditions from watershed - based plans including WIHMPs and TMDLS. The project site is located in the Newport Beach Watershed, located in the Santa Ana region. At the time of this report, a WIHMP for the "Newport Bay- Newport Coast" Watershed has not been approved. TMDL information is provided in Section III.3. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section II 21032-WQHP.doc Page 3 Section II Project Description II.1 Project Description Description of Proposed Project Development Category (From WQHP, Section 21.35.050): 1. A WQHP shall be required for a development of water quality concern that requires a coastal development permit and has the potential for adverse water quality or hydrologic impacts to coastal waters, including development that entails construction or entails activities or changes in land use other than construction. 2. Seventy-Five (75) Percent Impervious Surface Area. Development where seventy-five percent or more of the sites surface area will be impervious surfaces. Project Area (ft2): 3,331SF Number of Dwelling Units: 1 SIC Code: 1521 Project Area Pervious Impervious Area (acres or sq ft) Percentage Area (acres or sq ft) Percentage Pre-Project Conditions 173 SF 0.004 ACRES 5.2% 3,158 SF 0.073 ACRES 94.8% Post-Project Conditions 88 SF 0.002 ACRES 3.3% 3,243 SF 0.074 ACRES 96.7% Drainage Patterns/Connections The Site runoff currently flows to the front alley (Ocean Front Alley) which diverts water to the city storm drain system and ultimately the Pacific Ocean. Narrative Project Description: The project consists of the following: (1) demolition of the existing residence, associated hardscape, and walls excluding those designated to remain. (2) construction of two new single family residences with appurtenant hardscape, walls, and drainage improvements. All the roof runoff and surface runoff have been directed to flow through filter inserts as pre-treatment device. One of the roof drains will be treated by downspout filter and discharged to the sidewalk along Sea shore drive. The other roof drains will be discharged to the infiltration trench at the front yard area as described and designed in Section IV of this report. Run-off from high intensity storm events will overflow the infiltration trench, gravity flow to the alley front, then enter the city storm drain system and ultimately the Pacific Ocean. The Plot Plan in Section VI shows the site improvements to scale. I ················································. ······································································r················································· . . . . . . . . . . . . ················································~···························································r··········•················································· . . . . . . . . . . . . : ······························r·························••: ·······························r··························· . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ···············································································-···························································-··························· ...............................................•........................................................................................................................ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section II 21032-WQHP.doc Page 4 II.2 Potential Stormwater Pollutants Pollutants of Concern Pollutant Check One for each: E=Expected to be of concern N=Not Expected to be of concern Additional Information and Comments Suspended-Solid/ Sediment E N From Roof and hardscape areas Nutrients E N No proposed landscape areas Heavy Metals E N Not expected for residential development Pathogens (Bacteria/Virus) E N Living organisms Pesticides E N From undesired pest presence Oil and Grease E N Vehicles and other mechanical devices Toxic Organic Compounds E N Not expected for residential development Trash and Debris E N From typical human occupancy ~ □ ~ ~ □ ~ ~ □ ~ □ ~ □ □ ~ ~ □ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section II 21032-WQHP.doc Page 5 II.3 Hydrologic Conditions of Concern Determine if streams located downstream from the project area are potentially susceptible to hydromodification impacts. No. Yes Runoff enters lined city storm drain catch basin and storm drain system along Seashore Drive. See image below showing that the city storm drain pipe carries the runoff north directly to the Pacific Ocean. Per the Orange County Watershed Susceptibility map, the site is not within potential areas of erosion. site ecS'os 6qo, I .... " ~ I ,l /' I ~ ~~ WKID: 4326 L.aVLong .a. / 6s,, I Lat 33.62~:; Lon: 117.95 West Newport Park ~ .. ~ 0-9~ ~ ~ .._;- ,:"' .,, ~ I -11 I PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section II 21032-WQHP.doc Page 6 II.4 Post Development Drainage Characteristics The site drainage system is designed to treat and partially retain runoff via INF-2 Infiltration Trench prior to discharge in order to eliminate direct discharge into the Pacific Ocean. Drain inlets will be provided in site areas to collect excess runoff and not allow surface water to accumulate and result in standing water/ponding situations. All the roof runoff has been directed to flow through filter inserts as pre-treatment device before being directed to the infiltration trench. One of the roof drains will be discharged to the sidewalk along Sea shore drive. Drainage from paved areas shall be directed to flow away from the building foundation prior to collection by the proposed area drain system. The small site and limited available deck areas does not allow for impervious area dispersion. The proposed BMPs will remove sediment and pollutants through volume reduction before the runoff enters the City drainage system. In large storms, overflows of clean runoff will overflow and bypass the BMPs and flow directly to the curb and gutter across the street on Beacon Bay where it enters the existing city storm drain system and ultimately into the Pacific Ocean. Refer to the WQHP Plot Plan located in Section VI II.5 Property Ownership/Management The property is a single family private residence and will be owned and maintained by Mr. Stein. Maintenance contractors may be hired by the owner to perform maintenance duties. However, all storm water facilities will remain the responsibility of the homeowner. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section III 21032-WQHP.doc Page 7 Section III Site Description III.1 Physical Setting Name of Planned Community/Planning Area (if applicable) N/A Location/Address 6501 & 6503 Ocean Front, Newport Beach, CA General Plan Land Use Designation RT Two-Unit Residential Zoning R-2 Acreage of Project Site 0.0765 ac. Predominant Soil Type Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the soils report titled “Geotechnical Investigation” by R McCarthy, Inc. dated January 25, 2021 indicates: “The site surface exposed a thin layer of shallow sandy fill soils (Af) below the hardscape and within the planters over Marine deposits (Qm). The dense sands and gravels below depth of 10 feet may also include alluvial deposits from the Santa Ana River. Marine deposits generally consisted of tan, brown and gray sand ranging from fine to medium grained. The deposits were loose the dense with density increasing with depth. Subsurface soils included scattered shells, pebbles and gravel. Groundwater was present at a depth of approximately 8 feet in Boring B-1. The on-site soils near surface soils are predominantly granular sands that are non-plastic and non- expansive. Bedrock was not encountered to the maximum depth explored of 16.5 feet. Based on a review of collected documents, the depth to bedrock is estimates to be at least 20 to 400 feet bgs.” PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section III 21032-WQHP.doc Page 8 III.2 Site Characteristics Site Characteristics Precipitation Zone 0.70" (per the Orange County Public Works GIS website Topography The rectangular-shaped lot currently is the site of a single-family residence with hardscape features. The site currently slopes towards the front alley with an average slope of ~4%. The back rear slopes towards the beach with an average slope of ~6%. Drainage Patterns/Connections Existing drainage patterns. The project site is located in the Newport Beach Watershed, located in the Santa Ana region. Site runoff currently sheet flows the front alley where it is directed to the city storm drain system which ultimately flows to the Pacific Ocean. Proposed drainage patterns: The proposed drainage plan will collect runoff in a series of drain inlets and drain pipes, which will flow into a filter as a pre- treatment devise and an infiltration trench towards the front of the property. All roof run-off will flow through pre-treatment filter inserts prior to flowing into the infiltration trench as described and designed in Section IV of this report. Run-off from high intensity storm events will overflow the infiltration trench, and discharge to the existing front alley which will divert water to the curb and gutter of Seashore Drive where it enters the City storm drain system and ultimately into the Pacific Ocean. Soil Type, Geology, and Infiltration Properties Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the O.C. Hydrology manual, Soil Type A have high infiltration rates. Also, per the soils report, on-site water infiltration is allowable and a minimum setback of 3’ from the nearest foundation is recommended for large volume runoff. Hydrogeologic (Groundwater) Conditions Per soils report “Groundwater was encountered at a depth of approximately 8 feet on November 17, 2020. On-site groundwater conditions may additionally be affected by tidal conditions and fluctuate daily in conjunction with the incoming and outgoing tides. Collected reports generally indicate groundwater observed at depths of 9 to 10 feet bgs in the vicinity.” Geotechnical Conditions (relevant to infiltration) The site is underlain by Soil Type A which have high infiltration rates. The soils report has indicated groundwater 8 feet below existing surface which puts it at an at an elevation of approximately 4.5 feet. This will put the bottom of the trench approximately 5.5 feet above the groundwater level. All roof runoff will be pre-treated with filter inserts prior to discharge to city storm drain or entering the trench. The filter inserts are sized to filter small and large storm events. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section III 21032-WQHP.doc Page 9 Off-Site Drainage None. Utility and Infrastructure Information None. The proposed system includes inlets and drain pipes to collect runoff, BMPs for treatment. III.3 Watershed Description Receiving Waters Newport Beach 303(d) Listed Impairments Newport Beach is 303(d) listed by the State Water Resources Control Board for no impairments. Applicable TMDLs Total Maximum Daily Loads (TMDLs) are not established for any pollutants Pollutants of Concern for the Project Please see page 5. Environmentally Sensitive and Special Biological Significant Areas Newport Beach is an ESA, as it is a waterbody listed on the CW Section 303(d) list of impaired waters. Site runoff will be treated prior to off-site discharge. See section IV for BMP sizing. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 10 Section IV Best Management Practices (BMPs) IV. 1 Project Performance Criteria (NOC Permit Area only) Is there an approved WIHMP or equivalent for the project area that includes more stringent LID feasibility criteria or if there are opportunities identified for implementing LID on regional or sub-regional basis? YES NO If yes, describe WIHMP feasibility criteria or regional/sub-regional LID opportunities. N/A. Project Performance Criteria If HCOC exists, list applicable hydromodification control performance criteria (Section 7.II-2.4.2.2 in MWQHP) Per section II.3 of this report, HCOC’s do not exist for this project. List applicable LID performance criteria (Section 21.35.050 WQHP) • Priority Projects must infiltrate, harvest and use, evapotranspirate, or biotreat/biofilter, the 85th percentile, 24-hour storm event (Design Capture Volume). • A properly designed biotreatment system may only be considered if infiltration, harvest and use, and evapotranspiration (ET) cannot be feasibly implemented for the full design capture volume. In this case infiltration, harvest and use, and ET practices must be implemented to the greatest extent feasible and biotreatment may be provided for the remaining design capture volume. List applicable treatment control BMP performance criteria (Section 7.II-3.2.2 from MWQHP) • If treatment control BMPs can treat all of the remaining unmet volume and have a medium to high effectiveness for reducing the primary POCs, the project is considered to be in compliance. • If the cost of providing treatment control BMPs greatly outweighs the pollution control benefits they would provide, a waiver of treatment control and LID requirements can be requested and alternative compliance approaches must be used to fulfill the remaining unmet volume. □ ~ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 11 Calculate LID design storm capture volume for Project. Per Worksheet B Below V= 170 cubic feet PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 12 Worksheet B: Simple Design Capture Volume Sizing Method Step 1: Determine the design capture storm depth used for calculating volume 1 Enter design capture storm depth from Figure III.1, d (inches) d= 0.70 inches 2 Enter the effect of provided HSCs, dHSC (inches) (Worksheet A) dHSC= - inches 3 Calculate the remainder of the design capture storm depth, dremainder (inches) (Line 1 – Line 2) dremainder= 0.70 inches Step 2: Calculate the DCV 1 Enter Project area tributary to BMP (s), A (acres) A= 0.0765 acres 2 Enter Project Imperviousness, imp (unitless) imp= 0.967 3 Calculate runoff coefficient, C= (0.75 x imp) + 0.15 C= 0.875 4 Calculate runoff volume, Vdesign= (C x dremainder x A x 43560 x (1/12)) Vdesign= 170 cu-ft Step 3: Design BMPs to ensure full retention of the DCV Step 3a: Determine design infiltration rate 1 Enter measured infiltration rate, Kmeasured (in/hr) (Appendix VII) Kmeasured= In/hr 2 Enter combined safety factor from Worksheet H, Sfinal (unitless) Sfinal= 3 Calculate design infiltration rate, Kdesign = Kmeasured / Sfinal Kdesign= In/hr Step 3b: Determine minimum BMP footprint 4 Enter drawdown time, T (max 48 hours) T= Hours 5 Calculate max retention depth that can be drawn down within the drawdown time (feet), Dmax = Kdesign x T x (1/12) Dmax= feet 6 Calculate minimum area required for BMP (sq-ft), Amin = Vdesign/ dmax Amin= sq-ft PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 13 IV.2. Site Design and Drainage Overview The ultimate plan of development for the proposed project is shown on the pWQHP Site Plan in Section VI of this report. The project Preliminary Grading Plan shows the proposed site improvements necessary for construction of the proposed residential building. Site Design Practices The project incorporates Site Design practices as follows: • Preserve Existing Drainage Patterns and Time of Concentration – The ultimate points of discharge are the same for the pre- and post-project conditions. Time of concentration will be similar, since pre-and post-project flow path lengths will be similar. Drainage Management Areas (DMAs) The site has three Drainage Management Areas, DMA-1, DMA-2 and DMA-3. Drainage from DMA-1 and DMA-2 discharge into the front Alley (Ocean Front). The alley diverts water to Walnut street, which diverts to a storm drain inlet located across Seashore Drive, which flows water north and discharges into the Pacific Ocean. The exact locations of the drain lines are unknown. Drainage from DMA-3 discharges into pre-treatment device (Downspout filter) which discharges to sea Shore Drive and diverts to a storm drain inlet located across this street and ultimately into the Pacific Ocean. DMA-1 DMA-2 DMA-3 Total Area (ac) .027 0.028 0.021 Total Area (sf) 1,191 1,211 930 Impervious Area (sf) 1,191 1,123 930 Pervious Area (sf) 0 88 0 imp 1.0 0.93 1 C 0.90 0.85 0.90 d (in) 0.70 0.70 0.70 DCV (cf) 62 60 48 PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 14 IV.3 LID BMP Selection and Project Conformance Analysis Each sub-section below documents that the proposed design features conform to the applicable project performance criteria via check boxes, tables, calculations, narratives, and/or references to worksheets. IV.3.1 Hydrologic Source Controls (HSCs) Name Included? Localized on-lot infiltration Impervious area dispersion (e.g. roof top disconnection) Street trees (canopy interception) Residential rain barrels (not actively managed) Green roofs/Brown roofs Blue roofs Impervious area reduction (e.g. permeable pavers, site design) Other: The entire DCV is being treated/retained with the use of an infiltration trench with pretreatment Media filters. □ □ □ □ □ □ □ □ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 15 IV.3.2 Infiltration BMPs Name Included? Bioretention without underdrains Rain gardens Porous landscaping Infiltration planters Retention swales Infiltration trenches Infiltration basins Drywells Subsurface infiltration galleries French drains Permeable asphalt Permeable concrete Permeable concrete pavers Other: Other: The sizing has been done per the City of Newport Beach’s prescriptive requirements of “One 15’ long French drain per maximum of 2,000 sf of impervious area”. Therefore the sizing for this lot is: Gravel Volume within City’s 15’ Long Trench Drain = 15’L x 12”W x 12”D = 15 c.f. DMA-1: Sizing for infiltration trench = 1,191 s.f. x (15 c.f./2,000 s.f.) = 8.9 c.f. (minimum volume) French drain. The provided French drain for this project is 15’L x 12”W x 12”D = 15 c.f. > 8.9 c.f. …………ok DMA-2: Sizing for infiltration trench = 1,211 s.f. x (15 c.f./2,000 s.f.) = 9 c.f. (minimum volume) French drain. The provided French drain for this project is 15’L x 12”W x 12”D = 15 c.f. > 9 c.f. …………ok Please see Infiltration Feasibility worksheet on following pages. □ □ □ □ □ ~ □ □ □ □ □ □ □ □ □ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 16 Table 2.7: Infiltration BMP Feasibility Worksheet Infeasibility Criteria Yes No 1 Would Infiltration BMPs pose significant risk for groundwater related concerns? Refer to Appendix VII (Worksheet I) for guidance on groundwater-related infiltration feasibility criteria. X 2 Would Infiltration BMPs pose significant risk of increasing risk of geotechnical hazards that cannot be mitigated to an acceptable level? (Yes if the answer to any of the following questions is yes, as established by a geotechnical expert): The BMP can only be located less than 50 feet away from slopes steeper than 15 percent The BMP can only be located less than eight feet from building foundations or an alternative setback. A study prepared by a geotechnical professional or an available watershed study substantiates that stormwater infiltration would potentially result in significantly increased risks of geotechnical hazards that cannot be mitigated to an acceptable level. X . 3 Would infiltration of the DCV from drainage area violate downstream water rights? X There are no downstream water right holders since the site and the existing storm drain system is adjacent to the ocean. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 17 Table 2.7: Infiltration BMP Feasibility Worksheet (continued) Partial Infeasibility Criteria Yes No 4 Is proposed infiltration facility located on HSG D soils or the site geotechnical investigation identifies presence of soil characteristics which support categorization as D soils? X Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the O.C. Hydrology manual, Soil Type A have high infiltration rates. 5 Is measured infiltration rate below proposed facility less than 0.3 inches per hour? This calculation shall be based on the methods described in Appendix VII. X Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the O.C. Hydrology manual, Soil Type A have high infiltration rates. 6 Would reduction of over predeveloped conditions cause impairments to downstream beneficial uses, such as change of seasonality of ephemeral washes or increased discharge of contaminated groundwater to surface waters? X Prefilter will address groundwater contamination. Ephemeral washes are not applicable to this project that is adjacent to the ocean. 7 Would an increase in infiltration over predeveloped conditions cause impairments to downstream beneficial uses, such as change of seasonality of ephemeral washes or increased discharge of contaminated groundwater to surface waters? X PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 18 Table 2.7: Infiltration BMP Feasibility Worksheet (continued) Groundwater contamination is not a concern due to the use of prefilters. Ephemeral washes are not applicable to this project that is adjacent to the ocean. Infiltration Screening Results (check box corresponding to result): 8 Is there substantial evidence that infiltration from the project would result in a significant increase in I&I to the sanitary sewer that cannot be sufficiently mitigated? (See Appendix XVII) Provide narrative discussion and supporting evidence: The existing sanitary sewer main runs along the alley and would not be affected by the infiltration trench. 9 If any answer from row 1-3 is yes: infiltration of any volume is not feasible within the DMA or equivalent. Provide basis: 10 If any answer from row 4-8 is yes, infiltration is permissible but is not presumed to be feasible for the entire DCV. Criteria for designing biotreatment BMPs to achieve the maximum feasible infiltration and ET shall apply. Provide basis: Summarize findings of infeasibility screening 11 If all answers to rows 1 through 10 are no, infiltration of the full DCV is potentially feasible, BMPs must be designed to infiltrate the full DCV to the maximum extent practicable. X PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 19 IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs Name Included? All HSCs; See Section IV.3.1 Surface-based infiltration BMPs Biotreatment BMPs Above-ground cisterns and basins Underground detention Other: Other: Other: Since the project is fully treated using Hydrologic Source Controls and Infiltration BMPs, utilization of Evapotranspiration and/or Rainwater Harvesting BMPs is not required. □ □ □ □ □ □ □ □ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 20 IV.3.4 Biotreatment BMPs Biofiltration BMPs to be used for this project are indicated in the table below. Implementation of said controls is discussed in the text that follows. Name Included? Bioretention with underdrains Stormwater planter boxes with underdrains Rain gardens with underdrains Constructed wetlands Vegetated swales Vegetated filter strips Proprietary vegetated biotreatment systems Wet extended detention basin Dry extended detention basins Other: Pretreatment Media Filters Other: Since the project is fully treated using Hydrologic Source Controls and Infiltration BMPs, utilization of Biofiltration BMPs is not required. The entire DCV is treated/retained via an infiltration trench with pre- treatment Media filters. □ □ □ □ □ □ □ □ □ IZI □ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 21 IV.3.5 Hydromodification Control BMPs Hydromodification Control BMPs are not required. See Section II.3 of this WQHP. Hydromodification Control BMPs BMP Name BMP Description IV.3.6 Regional/Sub-Regional LID BMPs Regional/Sub-Regional LID BMPs N/A - This project will not participate in any Regional or Sub-Regional LID BMPs PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 22 IV.3.7 Treatment Control BMPs Treatment Control BMPs BMP Name BMP Description PRE-2 Catch Basin Filter Oldcastle Precast Flogard +Plus Trench Drain Filter (model FG-TDOf8) for removal of gross solids, trash and debris, and petroleum hydrocarbons. Used for filtration of roof and parking lot runoff prior to entering trench drain. PRE-2 Catch Basin Filter BioClean Downspout Filter (media type) (Model BC-DF4) for removal of TSS, hydrocarbons, metals, nutrients, and bacteria. Use and Location: Inlet filtration devices will be used as pre-treatment for infiltration BMPs or /and for proposed roof drains that cannot be routed to an infiltration BMP. Locations of proposed treatment control BMPs are shown on the BMP exhibit in Section VI. Performance: See specification sheets in Attachment D. Sizing: See Worksheet D (Capture Efficiency Method for Flow-Based BMPs) for pretreatment device capacity calculations at the end of this section. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 23 Worksheet D: Capture Efficiency Method for Flow-Based BMPs Step 1: Determine the design capture storm depth used for calculating volume 1 Enter the time of concentration, Tc (min) (See Appendix IV.2) Tc= 5 2 Using Figure III.4, determine the design intensity at which the estimated time of concentration (Tc) achieves 80% capture efficiency, I1 I1= 0.26 in/hr 3 Enter the effect depth of provided HSCs upstream, dHSC (inches) (Worksheet A) dHSC= - inches 4 Enter capture efficiency corresponding to dHSC, Y2 (Worksheet A) Y2= - % 5 Using Figure III.4, determine the design intensity at which the time of concentration (Tc) achieves the upstream capture efficiency(Y2), I2 I2= - 6 Determine the design intensity that must be provided by BMP, I- design= I1-I2 Idesign= 0.26 Step 2: Calculate the design flowrate 1 Enter Project area tributary to BMP (s), A (acres) A= See supporting Calculations 2 Enter Project Imperviousness, imp (unitless) imp= 3 Calculate runoff coefficient, C= (0.75 x imp) + 0.15 C= 4 Calculate design flowrate, Qdesign= (C x idesign x A) Qdesign= Supporting Calculations Filter Type † A idesign i100 imp C Qdesign Qfiltered1 Q100 Qoverflow1 ID sf ac in/hr in/hr gpm gpm gpm gpm DMA-1 B 1,191 0.0273 0.26 - 1 0.9 3 224 - - DMA-2 B 1,211 0.0278 0.26 - 0.93 0.85 3 224 - - DMA-3 A 930 0.0213 0.26 6.19 1 0.9 2 30 48 145 † Filter Type legend: A = BioClean media type downspout filter Model BC-DF4 B = Oldcastle Precast Flogard +Plus Trench Drain Filter Model FG-TDOF8 1 Filtered and overflow capacity provided by manufacturer. Provide time of concentration assumptions: Tc of 5-minutes is the minimum allowed and provides the most conservative design. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 24 TECHNICAL GUlDANCE DOCUMENT APPENDICES Figure 111.4. Capture Efficiency Nomograph for Off-line Flow-based Systems in Orange County 100% 90% >-u C: 80% <II u :E 70% w <II ... 60% ::::, -c.. Cl:! 50% u ro ::::, 40% C: C: <{ 30% <II OI Cl:! ... 20% <II > <{ 10% 0% 0.00 0.05 0.10 I ;...-:--,===¥~· I --Tc >= 60 minutes I ---Tc= 30 minutes I --Tc= 20 minutes Tc= 10 minutes Tc<= 5 minutes Extrapolated Data 0.15 0.20 0.2~ 0.30 0.35 0.40 Design Intensity, in/hr) g Ill-13 December 20, 2013 PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 25 IV.3.8 Non-structural Source Control BMPs Non-Structural Source Control BMPs Identifier Name Check One If not applicable, state brief reason Included Not Applicable N1 Education for Property Owners, Tenants and Occupants See Attachment A N2 Activity Restrictions N/A for residential construction N3 Common Area Landscape Management See attachment B N4 BMP Maintenance N/A for residential construction N5 Title 22 CCR Compliance (How development will comply) N/A for residential construction N6 Local Industrial Permit Compliance N/A for residential construction N7 Spill Contingency Plan No underground storage tanks N8 Underground Storage Tank Compliance No bulk storage of hazardous materials N9 Hazardous Materials Disclosure Compliance N/A for residential construction N10 Uniform Fire Code Implementation N/A for residential construction N11 Common Area Litter Control N/A for residential construction N12 Employee Training N/A for residential construction N13 Housekeeping of Loading Docks N/A for residential construction N14 Common Area Catch Basin Inspection Covered under N3 for SFR N15 Street Sweeping Private Streets and Parking Lots Street sweeping performed by City of Newport Beach N16 Retail Gasoline Outlets N/A for residential construction IZI □ □ IZI , .................... , ........................................................................... , .................................................................. . IZI □ , ................................................................................................................................................................. . IZI □ □ IZI , .................... , ........................................................................... , .................................................................. . □ IZI ............................................................................. ······o······ ········IZI········· ............................................. . , ................................................................................................................................................................. . □ IZI □ IZI , .................... , ........................................................................... , .................................................................. . □ IZI □ IZI , .................... , ........................................................................... , .................................................................. . □ IZI □ IZI , ................... I ..................................................................... 1 ................................................................ .. IZI □ □ IZI , .................... , ........................................................................... , .................................................................. . □ IZI PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 26 N1 – Education: The Owner must understand purpose of all BMPs and how they work. The contractor who installs the BMP shall educate the owner and the owner shall share the information with any maintenance personnel. Additionally, the owner shall keep a copy of this WQHP, as well as the Operations and Maintenance Plan. Practical information materials shall be provided to the first residents /occupants/tenants on general housekeeping practices that contribute to the protection of stormwater quality. These materials will be initially developed and provided to first residents/occupants/tenants by the developer. N3 – Common Area Landscape Management: The Owner shall keep garden areas clean, planted, and weed free. The Owner shall verify that landscape activities are consistent with those in the County Water Conservation Resolution (or city equivalent) that include fertilizer and/or pesticide usage consistent with Management Guidelines for Use of Fertilizers (DAMP Section 5.5). N4 – BMP Maintenance: The owner shall be responsible for each non-structural BMP and scheduled cleaning and/or maintenance of all structural BMP facilities. Visual inspection shall be performed by the owner or contracted personnel. More thorough inspection should be required if ponding water sits for more than 48 hours N14 – Common Area Catch Basin Inspection: The owner is required to have at least 80 percent of drainage facilities inspected, cleaned and maintained on an annual basis with 100 percent of the facilities included in a two year period. Cleaning should take place in the late summer/early fall prior to the start of the rainy season. Drainage facilities include catch basins (storm drain inlets), detention basins, retention basins, sediment basins, open drainage channels and lift stations. Records should be kept to document the annual maintenance. Drain inlets and catch basins shall be inpspected and inlet covers shall be kept clean. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 27 IV.3.9 Structural Source Control BMPs Fill out structural source control check box forms or provide a brief narrative explaining if structural source controls were not used. Structural Source Control BMPs Identifier Name Check One If not applicable, state brief reason Included Not Applicable S1 Provide storm drain system stenciling and signage All drain inlets are on private property S2 Design and construct outdoor material storage areas to reduce pollution introduction No outdoor material storage areas S3 Design and construct trash and waste storage areas to reduce pollution introduction S4 Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control S5 Protect slopes and channels and provide energy dissipation No slopes present Incorporate requirements applicable to individual priority project categories (from SDRWQCB NPDES Permit) Santa Ana region project S6 Dock areas Single family residential project S7 Maintenance bays Single family residential project S8 Vehicle wash areas Single family residential project S9 Outdoor processing areas Single family residential project S10 Equipment wash areas Single family residential project S11 Fueling areas Single family residential project S12 Hillside landscaping Single family residential project S13 Wash water control for food preparation areas Single family residential project S14 Community car wash racks Single family residential project I C=r=J □ ~ □ ~ ~ □ ~ □ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 28 S3 – Trash Enclosures: The Owner shall keep trash storage areas clean and orderly to reduce pollutant introduction. All trash container areas shall be paved with an impervious surface, designed not to allow run-on, screened or walled to prevent off-site transport of trash, and be provided with a roof or awning to prevent direct precipitation. S4 – Efficient Irrigation: Owner or contracted maintenance personnel shall ensure that sprinklers are working properly and minimize unnecessary irrigation.Projects shall design the timing and application methods of irrigation water to minimize the runoff of excessive irrigation water into the municipal storm drain system. Additionally, owner shall: Employ rain shutoff devices, design irrigation systems to each landscape areas specific requirements, use flow reducers, group plants with similar water requirements together. IV.4 Alternative Compliance Plan (If Applicable) The DCV is being fully treated/retained with the aforementioned Infiltration and filter insert BMPs. Alternative compliance is not required. IV.4.1 Water Quality Credits No water quality credits are applicable. Description of Proposed Project Project Types that Qualify for Water Quality Credits (Select all that apply): Redevelopment projects that reduce the overall impervious footprint of the project site. Brownfield redevelopment, meaning redevelopment, expansion, or reuse of real property which may be complicated by the presence or potential presence of hazardous substances, pollutants or contaminants, and which have the potential to contribute to adverse ground or surface WQ if not redeveloped. Higher density development projects which include two distinct categories (credits can only be taken for one category): those with more than seven units per acre of development (lower credit allowance); vertical density developments, for example, those with a Floor to Area Ratio (FAR) of 2 or those having more than 18 units per acre (greater credit allowance). -□ --□ --□ PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 29 Mixed use development, such as a combination of residential, commercial, industrial, office, institutional, or other land uses which incorporate design principles that can demonstrate environmental benefits that would not be realized through single use projects (e.g. reduced vehicle trip traffic with the potential to reduce sources of water or air pollution). Transit-oriented developments, such as a mixed use residential or commercial area designed to maximize access to public transportation; similar to above criterion, but where the development center is within one half mile of a mass transit center (e.g. bus, rail, light rail or commuter train station). Such projects would not be able to take credit for both categories, but may have greater credit assigned Redevelopment projects in an established historic district, historic preservation area, or similar significant city area including core City Center areas (to be defined through mapping). Developments with dedication of undeveloped portions to parks, preservation areas and other pervious uses. Developments in a city center area. Development s in historic districts or historic preservation areas. Live-work developments, a variety of developments designed to support residential and vocational needs together – similar to criteria to mixed use development; would not be able to take credit for both categories. In-fill projects, the conversion of empty lots and other underused spaces into more beneficially used spaces, such as residential or commercial areas. Calculation of Water Quality Credits (if applicable) None. -□ □ □ -□-----------------------------------------□ □ □ □ 1----------,~--~----'---------------------------------------------~-----I PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section IV 21032-WQHP.doc Page 30 IV.4.2 Alternative Compliance Plan Information N/A PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 31 Section V Inspection/Maintenance Responsibility for BMPs The responsible party for this property will be the homeowner: Mr. CHRIS BRIGANDI. Additionally, a funding mechanism has been established to maintain the BMPs as stated in this WQHP for the life of the project (or transfer/sale of property). BMP Inspection/Maintenance BMP Reponsible Party(s) Inspection/ Maintenance Activities Required Minimum Frequency of Activities INF-2 Infiltration Trench Owner or contracted maintenance personnel Visual Inspection, keep free of debris, perform more thorough inspection after storm events. Media (Gravel) Replacement Twice yearly and immediately following each storm event. Every 10 years as required TRT-2 Filter Insert (Treatment) Owner via maintenance contractors • Filter Insert Replacement/Rotation • Once a year. Refer to Manufacturer’s O&M plan on pages 36-39 for details. • Remove Sediment and debris. • Three times per year and after storm events. Refer to Manufacturer’s O&M plan on pages 36-39 for details. N11 – Common Area Litter Control Owner or contracted maintenance personnel Keep site clean of litter. Weekly N14 – Common Area Catch Basin Inspection Owner or contracted maintenance personnel Inspect drain inlets and catch basins. Keep inlet covers clean. Weekly PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 32 S1 – Storm Drain Stenciling Owner or contracted maintenance personnel Ensure that all catch basins are stencilled “No Dumping – Drains To Ocean.” Once, and as required when stencilling becomes illegible over time S3 – Trash & Waste Storage Area Owner or contracted maintenance personnel Keep trash storage areas clean and orderly. Weekly S4 – Efficient Irrigation Owner or contracted maintenance personnel Ensure that sprinklers are working properly and minimize unnecessary irrigation. Weekly PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 33 SCOPE: GENERAL SPECIFICATIONS FOR MAINTENANCE OF FLOGARD® LOPRO TRENCH DRAIN FILTERS Federal, State and Local Clean Water Act regulations and those of insurance carriers require th at storm water filtration systems be maintained and serviced on a recurring basis. The intent of the regulations is to ensure that the systems, on a continuing basis, efficiently remove pollutants from stormwater runoff thereby preventing pollution of the nation's water resources. These Specifications apply to the FloGard® LoPro Trench Drain Filter. RECOMMENDED FREQUENCY OF SERVICE: Drainage Protection Systems (DPS) recommends that installed FloGard® LoPro Trench Drain Filters be serviced on a recuITing basis. Ultimately, the frequency depends on the amount of runoff, pollutant loading and interference from debris (leaves, vegetation, cans, paper, etc.); however, it is recommended that each in stallati on be serviced a minimum of three times per year, with a change of filter medium once per year. DPS technicians are available to do an on-site evaluation, upon request. RECOMMENDED TIMING OF SERVICE: DPS guidelines for the timing of service are as follows: I. For areas with a definite rainy season: Prior to, during and following the rainy season. 2. For areas subject to year-roun d rainfall: On a recurring basis (at least three times per year). 3. For areas with winter snow and summer rain: Prior to and just after the snow season and during the summer rain season. 4. For installed devices not subject to the elements (wash racks, parking garages, etc.): On a recurring basis (no less th an three times per year). SERVICE PROCEDURES: I. The trench drain grate(s) shall be removed and set to one side. 2. The service shall commence with collecti on and removal of sediment and debris (litter, leaves, papers, cans, etc.) 3. The trench drain shall be visually inspected for defects and possible illegal dumping. If illegal dumping has occurred, the proper authorities and property owner representative shall be notifi ed as soon as practicable. 4. Using an industrial vacuum, the collected materials shall be removed from the filter liner. (Note: DPS uses a truck-mounted vacuum for servicing FloGard® LoPro Trench Drain Filters.) 5. When all of the collected materials have been removed, the filter assembly shall be removed from the drainage inlet. The outer filter liner shall be removed from the filter assembly and filter medium pouches shall be removed by unsnapping the tether from the interior ring and set to one side. The filter liner, PVC body and fittings shall be inspected for continued serviceability. Minor damage or defects found shall be corrected on the spot and a notation made on the Maintenance Record. More extensive deficiencies that affect the efficiency of the filter (torn liner, etc.), if approved by the customer representative, will be corrected and a quote submitted to the representative along with the Maintenance Record. 6. The filter liner and filter medium pouches shall be inspected for defects and continued serviceability and repl aced as necessary and the pouch tethers re-attached to th e PVC body interior ring. 7. The grate(s) shall be replaced. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 34 REPLACEMENT AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS The frequency of filter medium pouch exchange will be in accordance with the existing DPS-Customer Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the appropriate service, or if so determined by the service technician during a non-scheduled service, the filter medium pouches will be replaced. Once the exposed pouches and debris have been placed in the container, DPS has possession and must dispose of it in accordance with local, state and federal agency requirements. DPS also has the capability of servicing all types of catch basin inserts and catch basins without inserts, underground oil/water separators, stormwater interceptors and other treatment devices. All DPS personnel are highly qualified technicians and are confined space trained and cet·tified. Call us at (888) 950-8826 for further information and assistance. 04/07 PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 35 Section VI Site Plan and Drainage Plan VI.1 SITE PLAN AND DRAINAGE PLAN Include a site plan and drainage plan sheet set containing the following minimum information: • Project location • Site boundary • Land uses and land covers, as applicable • Suitability/feasibility constraints • Structural BMP locations • Drainage delineations and flow information • Drainage connections • BMP details VI.2 ELECTRONIC DATA SUBMITTAL The minimum requirement is to provide submittal of PDF exhibits in addition to hard copies. Format must not require specialized software to open. PA2021-078 2 STORY BUILDINGBUILDINGT/SLAB=13.33PAD=11.83T/SLAB=13.33PAD=11.83GARAGEGARAGE139 Avenida NavarroSan Clemente, CA 92672949.492.8586www.toalengineering.comCIVIL ENGINEERINGLAND SURVEYINGSTORMWATER QUALITYDETAILBOTTOMLESS CONCRETE CHANNEL DRAINW/ INFILTRATION TRENCHDETAILCONCRETE CHANNEL DRAINWQMP LEGENDPROPOSED BUILDINGPROPOSED LANDSCAPEPROPOSED HARDSCAPERUNOFF FLOW DIRECTIONDETAILPRE TREATMENT DEVICECHANNEL DRAIN W/ FILTER INSERTDETAILPRE TREATMENT DEVICEDOWNSPOUT FILTERBMP TABLEINLET/ CHANNEL DRAININFILTRATION TRENCH, DOWNSPOUT FILTERDOWNSPOUTDRAINAGE SYSTEMPA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VII 21032-WQHP.doc Page 38 Section VII Educational Materials Refer to the Orange County Stormwater Program (ocwatersheds.com) for a library of materials available. Please only attach the educational materials specifically applicable to this project. Other materials specific to the project may be included as well and must be attached. Education Materials Residential Material (http://www.ocwatersheds.com) Check If Applicable Business Material (http://www.ocwatersheds.com) Check If Applicable The Ocean Begins at Your Front Door Tips for the Automotive Industry Tips for Car Wash Fund-raisers Tips for Using Concrete and Mortar Tips for the Home Mechanic Tips for the Food Service Industry Homeowners Guide for Sustainable Water Use Proper Maintenance Practices for Your Business Household Tips Other Material Check If Attached Proper Disposal of Household Hazardous Waste Recycle at Your Local Used Oil Collection Center (North County) Recycle at Your Local Used Oil Collection Center (Central County) Recycle at Your Local Used Oil Collection Center (South County) Tips for Maintaining a Septic Tank System Responsible Pest Control Sewer Spill Tips for the Home Improvement Projects Tips for Horse Care Tips for Landscaping and Gardening Tips for Pet Care Tips for Pool Maintenance Tips for Residential Pool, Landscape and Hardscape Drains Tips for Projects Using Paint PA2021-078 ATTACHMENT A (BMP FACT SHEET) PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-24 December 20, 2013 INF-2: Infiltration Trench Fact Sheet An infiltration trench is a long, narrow, rock-filled trench with no outlet other than an overflow outlet. Runoff is stored in the void space between stones and infiltrates through the bottom and sides of the trench. Infiltration trenches provide the majority of their pollutant removal benefits through volume reduction. Pretreatment is important for limiting amounts of coarse sediment entering the trench which can clog and render the trench ineffective. Note: if an infiltration trench is “deeper than its widest surface dimension,” or includes an assemblage of perforated pipes, drain tiles, or other similar mechanisms intended to distribute runoff below the surface of the ground, it would probably be considered a "Class V Injection Well" under the federal Underground Injection Control (UIC) Program, which is regulated in California by U.S. EPA Region 9. A UIC permit may be required for such a facility (for details see http://www.epa.gov/region9/water/groundwater/uic-classv.html). Feasibility Screening Considerations x Infiltration trenches shall pass infeasibility screening criteria to be considered for use x Infiltration trenches, particularly deeper designs, may not provide significant attenuation of stormwater pollutants if underlying soils have high permeability; potential risk of groundwater contamination. x The potential for groundwater mounding should be evaluated if depth to seasonally high groundwater (unmounded) is less than 15 feet. Opportunity Criteria x Soils are adequate for infiltration or can be amended to provide an adequate infiltration rate. x Drainage area area is ≤ 5 acres and has low to moderate sediment production. x 2-3 percent of drainage area available for infiltration (generally requires less surface area than infiltration basins and bioretention areas without underdrain). x Space available for pretreatment (biotreatment or treatment control BMP as described below). x Potential for groundwater contamination can be mitigated through isolation of pollutant sources, pretreatment of inflow, and/or demonstration of adequate treatment capacity of underlying soils. x Infiltration is into native soil, or depth of engineered fill is ≤ 5 feet from the bottom of the facility to native material and infiltration into shallow fill is approved by a geotechnical professional. x Tributary area land uses include open areas adjacent to parking lots, driveways, and buildings, and roadway medians and shoulders. OC-Specific Design Criteria and Considerations □Must comply with local, state, and federal UIC regulations if applicable; a permit may be required. Also known as: ¾French Drains ¾Rock Trenches ¾Exfiltration Trenches ¾Soak-aways ¾Soakage Trenches Infiltration Trench Source: www.dot.ca.gov PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-25 December 20, 2013 □ Placement of BMPs should observe geotechnical recommendations with respect to geological hazards (e.g. landslides, liquefaction zones, erosion, etc.) and set-backs (e.g., foundations, utilities, roadways, etc.) □ For facilities with tributary area less than 1 acre and less than 3 foot depth, minimum separation to mounded seasonally high groundwater of 5 feet shall be observed. □ For facilities with tributary area greater than 1 acre or deeper than 3 feet, minimum separation to mounded seasonally high groundwater of 10 feet shall be observed. □ Minimum pretreatment should be provided upstream of the infiltration trench, and water bypassing pretreatment should not be directed to the infiltration trench. □ Infiltration trenches should not be used for drainage areas with high sediment production potential unless preceded by full treatment control with a BMP effective for sediment removal. □ Ponded water should not persist within 1 foot of the surface of the facility for longer than 72 hours following the end of a storm event (observation well is needed to allow observation of drain time). □ Energy dissipators should be provided at inlet and outlet to prevent erosion. □ An overflow device must be provided if basin is on-line. □ A minimum freeboard of one foot should be provided above the overflow device (for an on-line basin) or the outlet (for an off-line basin). □ Longitudinal trench slope should not exceed 3%. □ Side slopes above trench fill should not be steeper than 3:1. Simple Sizing Method for Infiltration Trenches If the Simple Design Capture Volume Sizing Method is used to size an infiltration trench, the user calculates the DCV and then designs the geometry required to draw down the DCV in 48 hours. The sizing steps are as follows: Step 1: Determine Infiltration Basin DCV Calculate the DCV using the Simple Design Capture Volume Sizing Method described in Appendix III.3.1. Step 2: Determine the 48-hour Effective Depth The depth of water that can be drawn down in 48 hours can be calculated using the following equation: d48 = KDESIGN × SACF × 48 hours Where: d48 = trench effective 48-hour depth, ft KDESIGN = basin design infiltration rate, in/hr (See Appendix VII) SACF = Surface Area Correction Factor = ranges from 1.0 (sides insignificant or not accounted) to 2.0 (sides plus bottom are 2 times the surface area of the bottom at mid depth) to account for the ratio of infiltration through the sides of the trench to the bottom footprint of the trench; should be based on anticipated trench geometry and wetted surface area at mid-depth. This is the maximum effective depth of the trench below the overflow device to achieve drawdown in 48 hours. PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-26 December 20, 2013 Step 3: Determine the Trench Ponding Depth and Trench Depth The depth of water stored in the ponding depth (i.e. above the trench fill) and within the trench itself should be equal or less than d48. Determine the ponding depth and the trench fill depth such that: d48 ≥ (nT × dT + dP) Where: d48 = trench effective 48-hour depth, ft (from Step 2) nT = porosity of trench fill; 0.35 may be assumed where other information is not available dT = depth of trench fill, ft dP = ponding depth, ft (should not exceed 1 ft) Step 4: Calculate the Required Infiltrating Area The required footprint area can be calculated using the following equation: A = DCV/ ((nT × dT) + dP) Where: A = required trench footprint area, sq-ft DCV = design capture volume, cu-ft (see Step 1) nT = porosity of trench fill; 0.35 may be assumed where other information is not available dT = depth of trench fill, ft dP = ponding depth, ft Capture Efficiency Method for Infiltration Trenches If BMP geometry has already been defined and deviates from the 48 hour drawdown time, the designer can use the Capture Efficiency Method for Volume-Based, Constant Drawdown BMPs (Appendix III.3.2) to determine the fraction of the DCV that must be provided to manage 80 percent of average annual runoff volume. This method accounts for drawdown time different than 48 hours. Step 1: Determine the drawdown time associated with the selected trench geometry DD = ((nT × dT) + dP) / (KDESIGN × SACF) × 12 Where: DD = time to completely drain infiltration basin ponding depth, hours nT = porosity of trench fill; 0.35 may be assumed where other information is not available dT = depth of trench fill, ft dP = ponding depth, ft SACF = Surface Area Correction Factor = ranges from 1.0 (sides insignificant or not accounted) to 2.0 (sides plus bottom are 2 times the surface area of the bottom at mid depth) to account for the ratio of infiltration through the sides of the trench to the bottom footprint of the trench; should be based on anticipated trench geometry and wetted surface area at mid-depth. KDESIGN = basin design infiltration rate, in/hr (See Appendix VII) Step 2: Determine the Required Adjusted DCV for this Drawdown Time Use the Capture Efficiency Method for Volume-Based, Constant Drawdown BMPs (Appendix III.3.2) to calculate the required fraction of the DCV the basin must hold to achieve 80 percent capture of average annual stormwater runoff volume based on the trench drawdown time calculated above. PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-27 December 20, 2013 Step 3: Determine the Trench Infiltrating Area Needed The required footprint area can be calculated using the following equation: A = DCV / ( (nT × dT) + dP) Where: A = required trench footprint area, sq-ft DCV = design capture volume, cu-ft (see Step 1) nT = porosity of trench fill; 0.35 may be assumed where other information is not available dT = depth of trench fill, ft dP = ponding depth, ft If the area required is greater than the selected trench area, adjust surface area or adjust ponding and/or trench depth and recalculate required area until the required area is achieved. Configuration for Use in a Treatment Train x Infiltration trenches may be preceeded in a treatment train by HSCs in the drainage area, which would reduce the required volume of the trench. x Infiltration trenches must be preceeded by some form of pretreatment which may be biotreatment or a treatment control BMP; if an approved biotreatment BMP is used as pretreatment, the overflow from the infiltration trench may be considered “biotreated” for the purposes of meeting the LID requirments x The overflow or bypass from an infiltration trench can be routed to a downstream biotreatment BMP and/or a treatment control BMP if additional control is required to achieve LID or treatment control requirements Additional References for Design Guidance x CASQA BMP Handbook for New and Redevelopment: http://www.cabmphandbooks.com/Documents/Development/TC-10.pdf x SMC LID Manual (pp 141): http://www.lowimpactdevelopment.org/guest75/pub/All_Projects/SoCal_LID_Manual/SoCalL ID_Manual_FINAL_040910.pdf x Los Angeles County Stormwater BMP Design and Maintenance Manual, Chapter 6: http://dpw.lacounty.gov/DES/design_manuals/StormwaterBMPDesignandrainage areaintenance.pdf x City of Portland Stormwater Management Manual (Soakage Trenches, page 2-82) http://www.portlandonline.com/bes/index.cfm?c=47954&a=202883 x San Diego County LID Handbook Appendix 4 (Factsheet 1): http://www.sdcounty.ca.gov/dplu/docs/LID-Appendices.pdf PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-74 December 20, 2013 TRT-2: Cartridge Media Filter Cartridge media filters (CMFs) are manufactured devices that consist of a series of modular filters packed with engineered media that can be contained in a catch basin, manhole, or vault that provide treatment through filtration and sedimentation. The manhole or vault may be divided into multiple chambers where the first chamber acts as a pre- settling basin for removal of coarse sediment while another chamber acts as the filter bay and houses the filter cartridges. A variety of media types are available from various manufacturers which can target pollutants of concern. Feasibility Screening Considerations x Not applicable Opportunity Criteria x Intended for use when retention and biotreatment options are infeasible. x Recommended for drainage area with limited available surface area or where surface BMPs would restrict uses. x For drainage areas with significant areas of non-stabilized soil, permanent soil stablization must be achieved before before cartridge media filters are installed and put on line to minimize risk of clogging. x Depending on the number of cartridges, maintenance events can have long durations. Care should be exercised in siting these facilities so that maintenance events will not significantly disrupt businesses or traffic. OC-Specific Design Criteria and Considerations □ Cartridge media filter BMP vendors should be consulted regarding design and specifications. □ Filter media should be selected to target pollutants of concern. A combination of media may be appropriate to remove a variety of pollutants. □ If CMF are integrated with a vault for equalization, the system should be designed to completely drain the vault within 96 hours of storm event or otherwise protect against standing water and mosquito breeding concerns. Computing Sizing Criteria for Cartridge Media Filters The required design flowrate should be calculated based on the Capture Efficiency Method for Flow- based BMPs (See Appendix III.3.3). Additional References for Design Guidance x Los Angeles County Stormwater BMP Design and Maintenance Manual, Chapter 9: http://dpw.lacounty.gov/DES/design_manuals/StormwaterBMPDesignandMaintenance.pdf Cartridge Media Filter Source: Contech Stormwater Solution, Inc. Also known as: ¾Manufactured Media Filters PA2021-078 TECHNICAL GUIDANCE DOCUMENT APPENDICES XIV-75 December 20, 2013 x SMC LID Manual: http://www.lowimpactdevelopment.org/guest75/pub/All_Projects/SoCal_LID_Manual/SoCalL ID_Manual_FINAL_040910.pdf x Western Washington Stormwater Management Manual, Volume V, Chapter 12: http://www.ecy.wa.gov/pubs/0510033.pdf PA2021-078 ATTACHMENT B (EDUCATION MATERIAL) PA2021-078 Did You Know? ■ ~Ion people bcliC\'C that the largest source of,,-.. ucr pollution in urban areas comes rrom SJJt·cific sources !!olldl as factu1ll's .and st•W'dgt· trcauucnt planlS. In fact, Lhc largest source of water pollution comes from city st.reelS, neighborhoods, construction sites and parking lot.s. This type ofpollu1ion is sometimes called "non•poim .source" polhnion. ■There are two types of non-point source pollmion: stormw-ater and urban runoff pollmion. ■Stonnwatcr nmoIT rcsuhs from rainfall. When rainstom1s cause large \'Olumcs of water to 1insc the urban landscape. picking up pollu:ants along 1.he way. ■Urban runoff can happen any time of the year when cxccssh·c water use from irrigation, vehicle washing and 01her sources carries 1rash, lawn clippings and other urban pollur.anu into 5tonn drains. Where Does It Go? ■Anything we uie out11ide home!, vebjcle! and businesses -like motor oil, paint, pesticides, fertilizers and cleaners -can be blown or washed into stonn drains. ■A little w:ater from a garden hose or rain can also send mat.criah into .nonn drains. ■Stonn drains arc separate fmrn our sanitary sewer !)'SleJru; unlike water in sanitary sewers (from sinks or toilcu)i water in storm drains is not treated before eni.eri.ng our waten\"3.)"S. UI O .J • 's: p ;) l( S .l ~ l P. ,'\\ :, 0 " ,\\ ,\\ }',\ uu0J llop.icw:bH UD1qwd uo~nnod .Dlll'!i\,\ ~U!tD-O (<<>L•L69-LLl!-ll Tllds-69-LLll-l :.u!Pl)H Bu1u~ t={qOJJ U0!11'1lJ0d .1:.1"',\\ .1no1ttt .Quno::, :dub() S~tL·L6S (LU) · · • • · • · 1iwlo.ld nll"jt,LWO}S Muno::, ~twJO 81.ll:196 (Ht)· Suµ))U~U] Tpun CQ-JOA 9t+J: 111."'968 (f'IL) ' •.• Ju~»u~u3/'1.1l'IA\)!IC't1'd J;,lfU'!U.OA,\\ OOn-866 (t,lt)' ' ' . " • ' " •.. !uj.1))U,!u3 '.1J~ !:Ill.A o,;;1i'i:Li; (tCl) · ' · ' · ·iuµ:.:>u~UJ/qJ0,A\)!fClfld Ufl"U. ►!)XX i1,g&'6,Li; (tlL) ' •••• ''1;J0,\\3flql\J UOltmS LI~ L7.S7.·t~'t (t9!i) ' . ' .. ' j~~UJIOJ ~ (e:,S Qij\'.1,, ... l.t9 (tit.)'.... . V':IJ0M>nqnJl!:UVQU~ S: I ~'7; (6t,6) . ' . . . . ... llu!,J:1:IU~U] OU'E.fll!{I'() u1:nr lll!S S:H9"t9• 0091~,g ~Vii.8't66 08t'9-t£'S ~ltt::·M'9 911ffl:1ll'1 st~·m OSli:·1911 000>6"9 tc,1,.69£ OC196·l0l 8lt0-l61 0 1"1)6') 66L6-';i06 !ilW-NiL ltl"!i-9f;~ 9%S-ll•L $</89il$L IVM.-S:6~ Mi~S:ilN, 01>!9"(;;.~ ttt~+~t. 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(ML)· · ·s:>;>!,U~ .>!lqnJ llY.)I\! t.1So:J (tld · • f1JO,\\ :>!IcII\J '''"d t:u.-.119 (ML)· · · · · ·Supa:,u!~u3 ~J\l (l•ld · · · · · · • • n.t0f1"..1:;"HIQ \"llJO,\\ )!lflllJ wp111:uv Sources of No11-Poi11t Sow·ce Pollution ■Automoth·e leaks and spills. ■ Improper disposal of used oil ;md other engine Ouids. ■ Metals found in \'Chicle exhaust, weathered paim, nist, metal plating and tires. ■ Pesticides and fertilizers from lawns. gardc1ls a11d famlS. ■ Improper disposal of cleaners, paint and paint rcmo"crs. ■Soil erosion and chm debris from landscape and constn1ction activities. ■ Liner, lawn clippinE,rs, animal waste. and other organic matter. ■Oil stains on parking lots and paved s11rfaces. wOO'fP::i11i.a~...,,.,:,n·1111au!nfoJu,...:.l~n1on Ol lflt'XI:, ft pu.,t :>ft:llld 'l'!I ~tp lf!Of Ol. ·nu::un:14:, nl"C-ISrudJn 11np'1u2nt:111dw1 :.qi p•~lJ()llnJ ucqm pU't J)lf."'UUOIS Ol ~lll!l)J PJdo, pu1: 11:)1'1"11noq1: u:;im ~! luomt p.:,p! ~ln!lf)D pur f'IJO!}Pnb :ll'Jl"-1 •1uori"Q!unmwo:i, :llflffi,e,J 01 lf!I Bum,w )!DQ.ll»)~ m: Ql't.l~pom pUY p;tlt).t:, fflf anuSoJJ J::r!~CUJClS Altmo:) :lilllll'JO :1iu, wO:)·it1,1:t):)n·MM.M \!f!.\.JO 9"91-80L (J,IL) aumoa »0.>pn~ .J~lffPJ ~fi WO)''qOOfllJlnlldUJqV·M..lf'..\\ 11£!1'. ,aooqpmff ~p:>'IJd 10:.waJ•osw: lNU ,1a1eM.1DJ0lS WOYWWoolieJO'M.M.M l!lfAJO OOIL·Ltt (t,ll) .UDO~ ~(lUµlv ':)'0 uo~anol ;)lft."'-P!101 pm: ua1u";11:> Xu1pb;u •u~,ua:, U0!-')):)110) :)lS'EM, fflOP-Jl?ttq p10,pmo4 uo UOf)ElWOJlf! 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The Effect on. the Ocean Non-point source pollution can ha.·c a serious impact on water quality in Orange County. Pollur.ant.s from Lhe ____ <_, __ _.J storm drain S}'Jtem can harm marine life as well as c:oa.nal and wetland habitats. They can also degradr. recreation areas .such aJ beaches, harbors and bays. Stormwater quality management programs ha\'e been de\·eloped throughout Orange County to educate and encourage the public to protect water quality, monitor runoff in the storm drain ~'Stem, inw,,tigaie illegal dumping and maintain stonn druins. Support from Orange County re!ident., and bwinesses i! needed to imprm•e water quality and reduce urban runoffpollucion. Proper use and di,po,al of material, will help <top pollution before it reache! the ~tonn drain and the ocean. - ~ -. -----~. -_ .. -._,., ·-. -. ,- PA2021-078 FolJow these simplcslcps to help reduce water pollution: Household Activities ■ Do not rinse spills with water. Use dry cleanup methods such as applying cat liner or another absorbcm material, sweep and dispose of in the trash. Take iu:ms such as used or excess baucrics, oven cleaners, automotive nuids, painting producu and cathode ra)' IUbcs, like TVs and compu1ei· monito1-s, to a J louschold Ha,ardous Waste Collec,ion Center ( 111 IWCC). ■For a III IWCC near )'OU call (7141 83+-6752 o,· visi1 ww,,.ocla,1dfiils.coo1. ■ Oo not hose clown your dri\'cway, sidewalk or patio 10 1hc s1rec1, gutter or storm drain. Sweep up debris and dispose ofiL in the LraSh. Automotive ■·lake your vchiclelO a commctcial car ,'lash ,vhcnever-p<>Ssiblc. lryou ,va3h your \'Chicle at home, <hoosc soaps, cleaners, or dctcrgems labeled norHox.ic, phosphat<. ... free or biodegradable. Vegetable and citrus•bascd products arc typically safest for the environment. ■ Do not allow washwatcr from vehicle washing to drain inlO 1hc street, guucr or stonn dr.1in. Excess washw·a1crshould be disposed ofin the sanitary se,•:cr (through a sink or toilet) or-onto an absorbent surface like your lawn. ■Monitor your vehicles for leaks and place a pan under leaks. Keep your vehicles well maintained to stop and prevent leaks. ■ Never pour oil or anti.freeze in the street, gutter- or storm drain. Recycle these substances at a service statioo, a waste oil collection center-or used oil rcqdii"'lgcemcr. 1-.. or the nearest Used Oil Collcc,ion Center call 1-800.CLEA:--IL'l' or visit Mn-.,.1800dc;.inup.org. Pool Mai11te11a11ce ■ Pool and spa water must be dechlorinated and free of excess acid, alkali or color to be allowed in the street, guuer or stor'lll drain. ■When 11 is not raining, drain dechlorinated pool and spa water directly into the sanitary sewer. ■Some cities may ha,·e ordinances that do 1101 allow pool \\later to be disposed or in the stonn drain. Check ,,ith your city. Landscape and Garde11i11g ■ Do not over-water. Water your lawn and garden by hand to control the amount of water you use or set irriga1ion srstems to rdlec1 seasonal ,v-,11c1 needs. If ,vatc1· nows off yout yard onto you1 driveway 01 sidewalk. your system is ovcM,,.ucring. Pc,iodically in:spcc1 cmd fi;\. kal,..,, .:md 1oi.:idi1cuc-d :sp1iu1Jcu. ■ Do not rake or blow lca"es, clippings or pruning wasLc into the street, guucr or Slonn drai11. hutead. dispose of wasLc by compoSLi1lg, hauling it to a pc1111itu•d lan<lfill, or as 1-!r,•c·n wa!t1c~ 1hrn11gh ynm city"s recycling program. ■ follow directions on pesticides and fertilizer, (measure, do not estimate amounts) ;md do not use if rain is predicted within 48 hours. ■Take unwamed pesticides to a l·ll lWCC to be rec)'clccl. For locations and hours of 1-1 HWCC, call (714) 8346752 or visit ww,\.ocla11clfills.corn. Trash ■Place trash and liner that cannot be recycled in securel)' covered lrash cans. ■Whenever possible, buy recycled products. ■ Remember: Reduce, Reuse, ReC)'clc. Pet Care ■Ah,m)'S pick up after your pet. Flush waste down the toilet or dispose ofiL in the 1rash. Pct waste, if left outdoors, can wash imo the street, gutter or stonn drain. ■If possible, bathe )'Our pets indoors. If you must bathe your pct outside, wash ii on your lawn or another absorbent/penneable .surface to keep the wash water from emering the street, gutter or storm drain. ■ Follow dircclions for use of pct. care products and di.spo5~ of any um15ed producu at a I-II-IWCC. PA2021-078 For more informatio n, please call the Orange County Stormwater Program a t 1-877-89-SPILL (1-877-897-7455) or visit www.ocwatersheds.com To Report Illegal Dumping of Household Hazardous Waste call 1-800-69-TOXIC To report a spill, call the Orange County 24-Hour Water Pollution Problem Reporting Hotline 1-877-89-SPILL (1-877-897-7455). For emergencies, dial 911. ' RCCYCLE USED O il. () P1i11tcd on Recycled Paper 'our .t'ront Uoor PROJECT Po33wt,on PREVENTION PA2021-078 Leftover household products that contain corrosive, toxic, ignitable, or reactive ivt 1/:A ' POSS/BU~. l !Sf:' .VO.V-1 l,\'/AR/)Ol IS OU 1.r:ss-11'\ '/Jlf U JOl 1s PRO/Jl '(,"IS. ingredients are considered to be "household hazardous waste" or "HHW." HHW can be found throughout your home, including the bathroom, kitchen, laundry room and garage. Disposal of HHW down the drain, on the ground, into storm drains, or in the trash is illegal and unsafe. Proper disposal of HHW is actually easy. Simply drop them off at a Household Hazardous Waste Collection Center (HHWCC) for free disposal and recycling. Many materials including anti-freeze, latex- based paint, motor oil and batteries can be recycled. Some centers have a "Stop & Swap" program that lets you take partially used home, garden, and automobile products free of charge. There are four HHWCCs in Orange County: Anaheim: .................. 1071 N. Blue Gum St Huntington Beach: ......... 17121 Nichols St Irvine: ............................ 6411 Oak Canyon Sanjuan Capistrano: ... 32250 La Pata Ave Centers are open Tuesday-Saturday, 9 a.m.- 3 p.m. Centers are closed on rainy days and major holidays. For more information, call (714) 834-6752 or visit www.oclandfills.com. Common househoul hazardous wastes ■ Batteries ■ Paint and paint products ■ Adhesives ■ Drain openers ■ Household cleaning products ■ Wood and metal cleaners and polishes ■ Pesticides ■ Fungicides/wood preservatives ■ Automotive products (antifreeze, motor oil, fluids) ■ Grease and rust solvents ■ Fluorescent lamps ■ Mercury (th ermometers & thermostats) ■ All forms of electronic waste including computers and microwaves ■ Pool & spa chemicals ■ Cleaners ■ Medications ■ Propane (camping & BBQ) ■ Mercury-containing lamps ■ Television & monitors (CRTs, flatscreens) Tips for household hazardous waste ■ Never dispose of HHW in the trash, street, gutter, storm drain or sewer. ■ Keep these materials in closed, labeled containers and store materials indoors or under a cover. ■ When possible, use non-hazardous products. ■ Reuse products whenever possible or share with family and friends. ■ Purchase only as much of a product as you'll need. Empty containers may be disposed of in the trash. ■ HHW can be harmful to humans, pets and the environment. Report emergencies to 911. PA2021-078 For more information, please call the Orange County Stormwater Program at 1-877-89-SPILL (1-877-897-7455) or visit www.ocwatersheds.com UCCE Master Gardener Hotline: (714) 708-1646 To report a spill, call the Orange County 24-Hour Water Pollution Problem Reporting Hotline 1-877-89-SPILL (1-877-897-7455). For emergencies, dial 9 11. The tips contained in this brochure provide usefnl information to help prevent water pollution while landscaping or gardening. lf you have other suggestions, please contact your city's stormwater representatives or call the O range County Stormwater Program . • # .. ... .., Printed on Recycled Paper at Your Front D R O J I C Po33tttio: PA2021-078 Never allow gardening products or polluted water to enter the street, gutter or storm drain. General Landscaping Tips ■ Protect stockpiles and materials from wind and rain by storing them under tarps or secured plastic sheeting. ■Prevent erosion of slopes by planting fast-growing, dense ground covering plants. These will shield and bind the soil. ■Plant native vegetation to reduce the amount of water, fertilizers, and pesticide applied to the landscape. ■Never apply pesticides or fertilizers when rain is -- predicted within the next 48 hours. Garden & Lawn Maintenance ■Do not overwater. Use irrigation practices such as drip irrigation, soaker hoses or micro spray systems. Periodically inspect and fix leaks and misdirected sprinklers. ■ Do not rake or blow leaves, clippings or pruning waste into the street, gutter or storm drain. Instead, dispose of green waste by composting, hauling it to a permitted landfill, or recycling it through your city's program. ■ Use slow-release fertilizers to minimize leaching, and use organic fertilizers. ■ Read labels and use only as directed. Do not over-apply pesticides or fertilizers. Apply to spots as needed, rather than blanketing an entire area. ■ Store pesticides, fertilizers and other chemicals in a dry covered area to prevent exposure that may result in the deterioration of containers and packaging. ■ Rinse empty pesticide containers and re-use rinse water as you would use the product. Do not dump rinse water down storm d rains. Dispose of empty containers in the trash. ■When available, use non-toxic alternatives to traditional pesticides, and use pesticides specifically designed to control the pest you are targeting. For more information, visit www.ipm.ucdavis.edu. ■ If fertilizer is spilled, sweep up the spill before irrigating. If the spill is liquid, apply an absorbent material such as cat litter, and then sweep it up and dispose of it in the trash. ■ Take unwanted pesticides to a Household Hazardous Waste Collection Center to be recycled. Locations are provided below. PA2021-078 For more infor mation , please call the Orange County Stormwater Program at 1-877-89-SPILL (1-877-897-7455) or visit www.ocwatersheds.com To report a spill, call the Orange County 24-Hour Water Pollution Reporting Hotline 1-877-89-SPILL (1-877-897-7455). For emergencies, dial 911. The rips contained in this brochure provide useful information to help prevent water pollution while maintaining your pool. If you have other suggestions, please contact your city's stormwater representatives or call the Orange County Stormwater Program. rTlie Ocean Begins at Your Front Door PR o ,J E CT PoJi~t,on P R E V E N T-1 0 N PA2021-078 Many pools are plumbed to allow the pool to drain directly to the sanitary sewer. If yours is not, follow these instructions for disposing of pool and spa water. Acceptable and Preferred Method of Disposal When you cannot dispose of pool water in the sanitary sewer, the release of dechlorinated swimming pool water is allowed if all of these tips are followed: ■ The residual chlorine does not exceed 0.1 mg/1 (parts per million). ■The pH is between 6.5 and 8.5. ■The water is free of any unusual coloration, dirt or algae. ■ There is no discharge of filter media. ■There is no discharge of acid cleaning wastes. ■ Some cities may have ordinances that do not allow pool water to be disposed into a storm drain. Check with your city. How to Know if You're Following the Standards You can find out how much chlorine is in your water by using a pool testing kit. Excess chlorine can be removed by discontinuing the use of chlorine for a few days prior to discharge or by purchasing dechlorinating chemicals from a local pool supply company. Always make sure to follow the instructions that come with any products you use. ~~~~ * +-:"-·--""i-. --~1 . . . . __ • . J_ ·- Doing Your Part By complying with these guidelines, you will make a significant contribution toward keeping pollutants out of Orange County's creeks, streams, rivers, bays and the ocean. This helps to protect organisms that are sensitive to pool chemicals, and helps to maintain the health of our environment. Pll:OJl<T Po~!ut,0 11 PRIVENTION •◄◄ PA2021-078 ATTACHMENT C (LOCATION MAP) PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence 21032-WQHP.doc Figure VI.1. Vicinity Map. PA2021-078 Water Quality Hydrology Plan (WQHP) 6501 & 6503 Seashore Drive Stein Residence Section VI 21032-WQHP.doc Page 37 Figure VI.2. Aerial Image. Source: maps.google.c SITE PA2021-078 ATTACHMENT D (OPERATION & MAINTENANCE) PA2021-078 ATTACHMENT D Operations and Maintenance (O&M) Plan for STEIN RESIDENCE 6501 & 6503 Seashore Drive Newport Beach, California 92663 APN 045-092-03 Overall Responsible Party/Owner: 6th Street Ventures, LLC STEVE STEIN 6503 Seashore Drive, Newport Beach, California 92663 714-681-5003 PA2021-078 Exhibit B, Operations and Maintenance Plan BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Non-Structural Source Control BMPs Yes N1. Education for Property Owners, Tenants and Occupants Practical information materials will be provided to the first residents/occupants/tenants on general housekeeping practices that contribute to the protection of stormwater quality. These materials will be initially developed and provided to first residents/occupants/tenants by the developer. Owner shall keep up to date with BMP requirements, and be responsible for educating maintenance personnel; As required. Owner No N2. Activity Restrictions Yes N3. Common Area Landscape Management Identify on-going landscape maintenance requirements that are consistent with those in the County Water Conservation Resolution (or city equivalent) that include fertilizer and/or pesticide usage consistent with Management Guidelines for Use of Fertilizers (DAMP Section 5.5). Statements regarding the specific applicable guidelines must be included in the project WQMP. Keep garden areas clean, planted, and weed free. Weekly. Owner or contracted maintenance personnel Yes N4. BMP Maintenance The project WQMP shall identify responsibility for implementation of each non-structural BMP and scheduled cleaning and/or maintenance of all structural BMP facilities. Visual Inspection, perform more thorough inspection if ponding water sits for more than 48 hours. Twice yearly and immediately following each storm event. Owner or contracted maintenance personnel No N5. Title 22 CCR Compliance No N6. Local Water Quality Permit Compliance No N7. Spill Contingency Plan No N8. Underground Storage Tank Compliance No N9. Hazardous Materials Disclosure Compliance No N10. Uniform Fire Code Implementation PA2021-078 Exhibit B, Operations and Maintenance Plan Page 2 of 7 BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Yes N11. Common Area Litter Control The owner may contract with their landscape maintenance firms to provide this service during regularly scheduled maintenance, which should consist of litter patrol, emptying of trash receptacles in common areas, and noting trash disposal violations by tenants/homeowners or businesses and reporting the violations to the owner/POA for investigation. Keep site clean of litter. Weekly. Owner or contracted maintenance personnel No N12. Employee Training No N13. Housekeeping of Loading Docks Yes N14. Common Area Catch Basin Inspection The owner is required to have at least 80 percent of drainage facilities inspected, cleaned and maintained on an annual basis with 100 percent of the facilities included in a two year period. Cleaning should take place in the late summer/early fall prior to the start of the rainy season. Drainage facilities include catch basins (storm drain inlets), detention basins, retention basins, sediment basins, open drainage channels and lift stations. Records should be kept to document the annual maintenance. Inspect drain inlets and catch basins. Keep inlet covers clean. Weekly. Owner or contracted maintenance personnel No N15. Street Sweeping Private Streets and Parking Lots Structural Source Control BMPs Yes S1. Provide Storm Drain System Stenciling and Signage Provide stenciling or labeling of all storm drain inlets and catch basins, constructed or modified, within the project area with prohibitive language and/or graphical icons, which discourage illegal dumping. Ensure that all catch basins are stencilled “No Dumping – Drains To Ocean.” Owner or contracted maintenance personnel No S2. Design Outdoor Hazardous Material Storage Areas to Reduce Pollutant Introduction PA2021-078 Exhibit B, Operations and Maintenance Plan Page 3 of 7 BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Yes S3. Design Trash Enclosures to Reduce Pollutant Introduction Design trash storage areas to reduce pollutant introduction. All trash container areas shall be paved with an impervious surface, designed not to allow run-on, screened or walled to prevent off-site transport of trash, and be provided with a roof or awning to prevent direct precipitation. Keep trash storage areas clean and orderly. Weekly. Owner or contracted maintenance personnel Yes S4. Use Efficient Irrigation Systems and Landscape Design Projects shall design the timing and application methods of irrigation water to minimize the runoff of excessive irrigation water into the municipal storm drain system. Additionally, permittee shall: Employ rain shutoff devices, design irrigation systems to each landscape areas specific requirements, use flow reducers, group plants with similar water requirements together. Ensure that sprinklers are working properly and minimize unnecessary irrigation. Weekly. Owner or contracted maintenance personnel No S5. Protect Slopes and Channels No S6. Loading Dock Areas No S7. Maintenance Bays and Docks No S8. Vehicle Wash Areas No S9. Outdoor Processing Areas No S10. Equipment Wash Areas No S11. Fueling Areas No S12. Site Design and Landscape Planning No S13. Wash Water Controls for Food Preparation Areas No S14. Community Car Wash Racks PA2021-078 Exhibit B, Operations and Maintenance Plan Page 4 of 7 BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Low Impact Development BMPs Infiltration trench (INF-2) • Visual Inspection, keep free of debris, perform more thorough inspection after storm events. • Media (Gravel) Replacement • Filter Fabric Replacement • Twice yearly and immediately following each storm event. • Every 10 years as req’d • Once a year as req’d Owner via maintenance contractors Filter Insert. (TRT-2) • Filter insert Replacement/Rotation • Remove Sediment and Debris • Once a year. Refer to Manufacturer’s O&M plan on pages 36-38 for details. • Three times per year and after storm events. Refer to Manufacturer’s O&M plan on pages 6 and 7 for details. Owner via maintenance contractors PA2021-078 Exhibit B, Operations and Maintenance Plan Attachments PA2021-078 EXCHANGE AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS The frequency of filter medium pouch exchange will be in accordance with the existing DPS-Custom er Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the appropriate service, or if so determined by the service technician during a non-scheduled service, the filter medium pouches will be replaced with new pouches and the exposed pouches placed in the DOT approved container, along with the exposed debris. Once the exposed pouches and debris have been placed in the container, DPS has possession and must dispose of it in accordance with local, state and federal agency requirements. Note: As the generator, the landuwner is ultimately responsible for the proper disposal of the exposed jilter medium and debris. Because the materials likely contain petroleum hydrocarbons, heavy metals and other harmful pollutants, the materials must be treated as an EPA Class 2 Hazardous Waste and properly disposed of DPS relieves the landowner of the actual disposal task, and provides certification of its completion in accordance with appropriate regulations. DPS also has the capability of servicing all manner of catch basin inserts and catch basins without inserts, underground oil/water separators, stormwater interceptors and other such devices. All DPS personnel are highly qualified technicians and are confined space trained and certified. Call us at (888) 950-8826 for further information and assistance. PA2021-078 Required Permits This section must list any permits required for the implementation, operation, and maintenance of the BMPs. Possible examples are: • Permits for connection to sanitary sewer • Permits from California Department of Fish and Game • Encroachment permits If no permits are required, a statement to that effect should be made. Forms to Record BMP Implementation, Maintenance, and Inspection The form that will be used to record implementation, maintenance, and inspection of BMPs is attached. Recordkeeping All records must be maintained for at least five (5) years and must be made available for review upon request. PA2021-078 RECORD OF BMP IMPLEMENTATION, MAINTENANCE, AND INSPECTION Today’s Date: Name of Person Performing Activity (Printed): Signature: BMP Name (As Shown in O&M Plan) Brief Description of Implementation, Maintenance, and Inspection Activity Performed PA2021-078 ATTACHMENT (filter insert spec. sheet) E PA2021-078 GENERAL SPECIFICATIONS FOR MAINTENANCE OF FLOGARD® LOPRO TRENCH DRAIN FILTERS SCOPE: Federal, State and Local Clean Water Act regulations and those of insurance carriers require that stormwater filtration systems be maintained and serviced on a recurring basis. The intent of the regulations is to ensure that the systems, on a continuing basis, efficiently remove pollutants from stormwater runoff thereby preventing pollution of the nation’s water resources. These Specifications apply to the FloGard® LoPro Trench Drain Filter. RECOMMENDED FREQUENCY OF SERVICE: Drainage Protection Systems (DPS) recommends that installed FloGard® LoPro Trench Drain Filters be serviced on a recurring basis. Ultimately, the frequency depends on the amount of runoff, pollutant loading and interference from debris (leaves, vegetation, cans, paper, etc.); however, it is recommended that each installation be serviced a minimum of three times per year, with a change of filter medium once per year. DPS technicians are available to do an on-site evaluation, upon request. RECOMMENDED TIMING OF SERVICE: DPS guidelines for the timing of service are as follows: 1. For areas with a definite rainy season: Prior to, during and following the rainy season. 2. For areas subject to year-round rainfall: On a recurring basis (at least three times per year). 3. For areas with winter snow and summer rain: Prior to and just after the snow season and during the summer rain season. 4. For installed devices not subject to the elements (wash racks, parking garages, etc.): On a recurring basis (no less than three times per year). SERVICE PROCEDURES: 1. The trench drain grate(s) shall be removed and set to one side. 2. The service shall commence with collection and removal of sediment and debris (litter, leaves, papers, cans, etc.) 3. The trench drain shall be visually inspected for defects and possible illegal dumping. If illegal dumping has occurred, the proper authorities and property owner representative shall be notified as soon as practicable. 4. Using an industrial vacuum, the collected materials shall be removed from the filter liner. (Note: DPS uses a truck-mounted vacuum for servicing FloGard® LoPro Trench Drain Filters.) 5. When all of the collected materials have been removed, the filter assembly shall be removed from the drainage inlet. The outer filter liner shall be removed from the filter assembly and filter medium pouches shall be removed by unsnapping the tether from the interior ring and set to one side. The filter liner, PVC body and fittings shall be inspected for continued serviceability. Minor damage or defects found shall be corrected on the spot and a notation made on the Maintenance Record. More extensive deficiencies that affect the efficiency of the filter (torn liner, etc.), if approved by the customer representative, will be corrected and a quote submitted to the representative along with the Maintenance Record. 6. The filter liner and filter medium pouches shall be inspected for defects and continued serviceability and replaced as necessary and the pouch tethers re-attached to the PVC body interior ring. 7. The grate(s) shall be replaced. PA2021-078 REPLACEMENT AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS The frequency of filter medium pouch exchange will be in accordance with the existing DPS-Customer Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the appropriate service, or if so determined by the service technician during a non-scheduled service, the filter medium pouches will be replaced. Once the exposed pouches and debris have been placed in the container, DPS has possession and must dispose of it in accordance with local, state and federal agency requirements. DPS also has the capability of servicing all types of catch basin inserts and catch basins without inserts, underground oil/water separators, stormwater interceptors and other treatment devices. All DPS personnel are highly qualified technicians and are confined space trained and certified. Call us at (888) 950-8826 for further information and assistance. 04/07 PA2021-078 Installation & Maintenance Guide FLOGARD® DOWNSPOUT FILTER DRAINA G E P R OTECTION SY ST E MSA division of Oldcastle Precast PA2021-078 INSTALLATION GUIDELINES: 1. Install 4 to 6 feet above the ground or ﬂ oor in a readily accessible location 2. Firmly secure ﬁ lter housing to wall using U-bolts or other mounting brackets. 3. Connect ﬁ lter pipe stubs to downspout pipes using banded no-hub ﬂ exible couplers. MAINTENANCE GUIDELINES: Federal, State and Local Clean Water Act regulations and those of insurance carriers require that stormwater ﬁ ltration systems be maintained and serviced on a recurring basis. The intent of the regulations is to ensure that the systems, on a continuing basis, efﬁ ciently remove pollutants from stormwater runoff thereby preventing pollution of the nation’s water resources. These Speciﬁ cations apply to the FloGard® Downspout Filter. RECOMMENDED FREQUENCY OF SERVICE: Drainage Protection Systems (DPS) recommends that installed FloGard Downspout Filters be serviced on a recurring basis. Ultimately, the frequency depends on the amount of runoff, pollutant loading and interference from debris (leaves, vegetation, cans, paper, etc.); however, it is recommended that each installation be serviced a minimum of three times per year, with a change of ﬁ lter medium once per year. DPS technicians are available to do an on-site evaluation, upon request. RECOMMENDED TIMING OF SERVICE: DPS guidelines for the timing of service are as follows: 1. For areas with a deﬁ nite rainy season: Prior to, during and following the rainy season. 2. For areas subject to year-round rainfall: On a recurring basis (at least three times per year).3. For areas with winter snow and summer rain: Prior to and just after the snow season and during the summer rain season. 4. For installed devices not subject to the elements (washracks, parking garages, etc.): On a recurring basis (no less than three times per year). SERVICE PROCEDURES: 1. The FloGard Downspout Filter shall be visually inspected for defects and possible leakage. 2. The Downspout Filter access door shall be opened. The ﬁ lter tray shall be carefully pulled out using the handle and set on the ﬂ oor over a drop cloth.3. The collected materials in the upper ﬁ lter shall be inspected, and then removed from the liner using an industrial vacuum or by dumping into an appropriate DOT approved container. 4. When all of the collected materials have been removed from the upper ﬁ lter, it shall be removed to allow access to the lower ﬁ lter medium.5. The ﬁ lter liner, gaskets, stainless steel frame and mounting brackets, etc., shall be inspected for continued serviceability. Minor damage or defects found shall be corrected on the spot and a notation made on the Maintenance Record. More extensive deﬁ ciencies that affect the efﬁ ciency of the ﬁ lter (torn liner, door gasket damage, etc.), if approved by the customer representative, will be corrected and an invoice submitted to the representative along with the Maintenance Record.6. The ﬁ lter medium shall be inspected for defects and continued serviceability and replaced as necessary. See below for disposal. 7. The ﬁ lter components and tray shall be replaced in the housing and the door closed and secured. 2 A. Smaller 4” and 6” downspout ﬁ lters do not come with any mounting hardware or brackets. They are mounted in-line on the downspout pipes with a no-hub coupler like a Fernco. B. Larger 8” and 10” units come with all required mounting hardware and brackets. PA2021-078 3 REPLACEMENT AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS The frequency of ﬁ lter medium exchange will be in accordance with the existing DPS-Customer Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the appropriate service, or if so determined by the service technician during a non-scheduled service, the ﬁ lter medium will be replaced with new material. Once the exposed pouches and debris have been removed, DPS has possession and must dispose of it in accordance with local, state and federal agency requirements. DPS also has the capability of servicing all manner of storm drain ﬁ lters, catch basin inserts and catch basins without inserts, underground oil/water separators, stormwater interceptors and other such devices. All DPS personnel are highly qualiﬁ ed technicians and are conﬁ ned space trained and certiﬁ ed. Call us at (888) 950-8826 for further information and assistance. PA2021-078 www.oldcastlestormwater.com 800-579-8819 BUILDING STRUCTURES OUR MARKETS TRANSPORTATION WATER ENERGYCOMMUNICATIONS FLOGARD® DOWNSPOUT FILTER PA2021-078