The URL can be used to link to this page

Home My WebLink AboutN2013-0258• Legend Work areas within Public Utilities Easement f' + i' ✓ CR�S1 C1R / r P OR Disclaimer: Every reasonable effort has been made to assure the accuracy of the data Newport 0 40 80 provided, however, The City of Newport Beach and its employees and Beach M agents disclaim any and all responsibility from or relating to any results us Feet obtained in its use. GAS Imagery: 2009-2011 photos provided by Eagle Imaging www.eagleaerial.com 7/5/2013 Owner: Canyon Crest Estates Homeowners Association Page 1 of 2 N2013-0258 Address: Canyon Crest Estates Tract No. 8406 Exhibit "A" o�`'�WPOR a Newport 0 40 80 Beach " a GIS Feet C,O Fn R r r r Legend Work areas within Public Utilities Easement Disclaimer: Every reasonable effort has been made to assure the accuracy of the data provided, however, The City of Newport Beach and its employees and agents disclaim any and all responsibility from or relating to any results obtained in its use. Imagery: 2009-2011 photos provided by Eagle Imaging www.eagleaerial.com 7/5/2013 Owner: Canyon Crest Estates Homeowners Association Page 2 of 2 N2013-0258 Address: Canyon Crest Estates Tract No. 8406 Exhibit "A" CXU GEOTECHNICAL, INC. May 9, 2011 Ms. Gloria Hickman Vice President WET SIGNATURE 23241 Arroyo Vista Rancho Santa Margarita CA 92688 voice: 949,888.6513 fax 949.888.1380 web: www.gmugeo.com CANYON CREST ESTATES HOMEOWNERS ASSOCIATION 4 Canyon Lane Corona del Mar, CA 92625 _ GMU Project 11-058-00 Subject: Limited Geotechnical investigation and Design Services - New Interlocking Pavers for the Canyon Crest Estates Homeowners Association, -Canyon -Crest Drive, Crest Circle, and Canyon Lane, Corona del Mar, City of Newport Beach, California. References: (1) Canyon Crest Estates Homeowners Association Site Plan, provided by PCM via e-mail on January 18, 2011. (2) Our "Updated Proposal for Providing Limited Geotechnical Investigation and Design Services - New Interlocking Pavers for the Canyon Crest Estates Homeowners Association, Canyon Crest Drive, Crest Circle, and Canyon Lane, Corona del Mar, City of Newport Beach, California, " dated March 7, 2011 (GMU Proposal P-11008). Dear Ms. Hickman: We are pleased to submit this letter report presenting the results of our limited geotechnical investigation and design services for the subject new interlocking pavers for the Canyon Crest Estates Homeowners Association, Canyon Crest Drive, Crest Circle, and Canyon Lane, Corona del Mar,. in.- the City of Newport Beach, California. The location- map- for the subject site is attached to this letter report as Plate 1. GMU Geotechnical, Inc. has utilized the reference site plan for our geotechnical map, attached as Plate 2 to this letter report. Per the scope of our reference (2) proposal, Mr. David Atkinson of GMU Geotechnical Inc. (GMU) performed a site reconnaissance of the subject area and later marked our drill hole locations for underground service alert clearance and to schedule the subsurface investigation. GMU performed a subsurface investigation on April 15, 2011, consisting of three hand -augured drill holes cored through the existing stamped concrete driveway areas adjacent to #24 Crest Circle, #11 Canyon Crest Drive,. and in front of # 25- Canyon., rest Drive. Bulk samples of the subgrade soil materials were obtained in each of the drill hole locations to a maximum depth of 5.0 feet. The estimated locations of the drill holes are shown on the attached Geotechnicat"Map, Plate 2. At each drill hole location, a visual classification of the soil subgrade materials were determined and samples were obtained for R-value laboratory testing. Ms. Gloria Hickman, CANYON CREST ESTATES HOMEOWNERS ASSOCIATION Interlocking Pavers for the Canyon Crest Estates Homeowners Association, Corona del Mar GEOTECHNICAL FINDINGS The subgrade soil materials in the top four feet were sampled at each drill hole location and were visually classified- as sandy clay (CL) or clayey sand (SC). No groundwater was encountered during our exploration. Three representative samples of the subgrade soil materials were tested per ASTM D2844 with results of our laboratory tests indicating that the R-values ranged from a high value of 9 to the lowest R-value of 5. We have assumed an R-value of 5 for our recommendations. CONCRETE INTERLOCKING PAVERS We understand that the drive areas for the Canyon Crest Estates Homeowners Association in -Corona del Mar will utilize 80 mm. vehicular concrete interlocking pavers manufactured by Olsen Pavingstone placed on a section of 1-inch-thick bedding sand. These entry pavers are planned to replace the existing stamped concrete PCC drive areas throughout the development. In order to support fire department vehicle access capable of supporting 72,000 pounds of imposed loading, GMU recommends that once the existing. stamped concrete drive .areas ar.e- demolished and cleared of debris, the on -site soil subgrade in each area should be scarified to a depth of 6 inches, moisture conditioned to at least 4% above the optimum moisture content, and compacted to at least 90% relative compaction. A geotextile fabric such as Tencate Mirafi RS580i or equivalent should be placed on top of the compacted subgrade across the entire subject drive interlocking paver areas. Based upon the on -she soils having a lowest R-value of 5, a 12-inch-thick layer of Crushed Miscellaneous Base (CMB) or Class 2 aggregate base (AB) should be moisture conditioned to at least optimum moisture and compacted to at least 95% relative compaction in order to support the interlocking pavers. CONCRETE PAVING Any concrete bands planned adjacent to the vehicular interlocking pavers, which also provide fire department vehicle access capable of supporting 72,000 pounds of imposed Ioading, should consist of a design section of 8 inches of PCC over at least 6 inches of AB or equivalent, moisture conditioned to at least optimum moisture, and 'compacted to at least 95% relative compaction. GMU recommends that prior to the installation of the subject concrete bands, the on -site soil subgrade should be scarified to a depth of six inches,_ moisture conditioned to at least 4% above the optimum moisture content, and compacted to at least 90% relative compaction. A 67inch-thick layer of Class 2 aggregate base (AB) or equivalent should then be placed on top of the soil subgrade, moisture conditioned to at least optimum moisture, and compacted to at least 95% relative compaction. We recommend the 8-inch-thick section of Portland cement concrete utilize a #4 bar placed in the center of the concrete band. Joint spacing should be considered - every 5 to 1.0 feet. We recommend utilizing Type II/V, 560-C-3250 Portland cement concrete. May 9,2011 2 GMU Project 11-058-00 Ms. Gloria HickmaA CANYON CREST ESTATES HOMEOWNERS ASSOCIATION Interlocking Pavers for the Canyon Crest Estates Homeowners Association, Corona del Mar CONCLUSIONS AND LE IITATIONS It is our opinion that the recommendations contained in this letter report provide for fire department vehicle access capable of supporting 72,000 pounds of imposed loading and that the subject construction is feasible from a geotechnical standpoint. All parties reviewing or utilizing this report should recognize that the findings, conclusions, and recommendations presented represent the results of our professional geotechnical engineering efforts and judgments. We have exercised a degree of care comparable to the standard of .practice presently maintained by other professionals in the fields of geotechnical engineering, and believe that our findings present a reasonably representative description of geotechnical conditions and their probable influence on the subject improvements. Please do not hesitate to call if you have any questions or comments regarding this letter report. Respectfully submitted, GMU GEOTECHNICAL, INC. c �-- David R. Atkinson b. /Vio�`cc�'. Senior Engineer/Project Manager I CE No. 25ao Exp. 06-30-11 ``B. Moscrop, M.Sc., 2540 Principal Geotecluucal tngineer (Four {4) wet signature copies submitted) Attachments: Plate 1- Site Location Map Plate 2 - Geotecbnical Map Appendix - Geotechnical Drill Hole Logs cc: Mr. Michael Clayton (One (1) copy) Professional Community Management (PCM) Attn: Ms. Debbie Stinson (Two (2) wet signature copies) dra/11-058-OOL (5-9-11) May 9, 2011 3 GMU Project 11-058-00