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Home My WebLink AboutGB090012_ISSSUED-GB090012-Docs-Rev.4�4 Orange.'County / Environmental / Corporate 3190 Airport Loop Drive, Suite J-1 Costa Mesa, California 92626 A+ T:714.549.8921 F:714.5714.549.1438 'Y RECEIVED MAR 2 5 2013 COUNTY OF ORANGE MR. PARVIZ SAFAEI C/O David Pierce Hohmann Architect 250 Baker Street East, Suite 200 Costa Mesa, CA 92626 PETRA past + present + future March 18,2013 it's inourscience J.N. 267-08 Engineers, Geologists Enviranmental Scientists Site Address: 21 Avalon Vista Newport Coast Subject: Geotechnical Review of Delta 4 Revision of Precise Grading Plans, Proposed Single - Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California. References: See Attached List. Dear Mr. Safaei: At the request of the project civil engineer, we have reviewed sheets 1 through 3 of the precise grading plans for the subject project. The precise grading plans were prepared by Toal Engineering, Inc. with a delta 4 revision date of March 5, 2013. Following the recommendations presented in the Petra Geotechnical, Inc. (Petra) original geoteehnical investigation report for the site (Reference No. 1), precise grading of site was completed in May 2010 with observation and testing services provided by Petra (Reference No. 4). The current plan was developed to depict revised drain inlet locations and the addition of an 18 inch high stacked wall at the southwesterly corner of the property. Based upon our review, sheets 1 through 3 of the delta 4 revised precise grading plans are considered acceptable from a geotechnical point of view. The recommendations presented in the referenced reports remain applicable with respect to precise grading and for the design and construction of the proposed residence and exterior improvements. This letter is subject to review by the controlling authorities for the subject project. If you have any questions or require additional information, please contact us at (714) 549-8921. Respectfully submitted, PETRA C;EOTECHNICAL, 3 � Don Obert, RGE 2872 Associate Engineer DO/DR/kg W:\2008\200\267-08\150\Revision No. 4 Plan Review.doc 01 DARREL L. ROBERTS Darrel Roberts, CEG 1972 NO.1972 Principal Geologist • CERTIFIED EVGINEFRINI;; N� GEOLOGIST 0 A MR. PARVIZ SAFAEI March 18, 2013 21 Avalon Vista J.N. 267-08 Page 2 REFERENCES 1. Geotechnical Investigation, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; report by Petra Geotechnical, Inc., dated September 25, 2008. 2. Geotechnical Review of Precise Grading Plans, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; letter by Petra Geotechnical; letter by Petra Geotechnical, Inc., dated February 16, 2009. 3. Response to Geotechnical Report Review Sheet by the County of Orange Planning and Development Services Department for Lot 15 of Tract 15436, 21 Avalon Vista, Pelican Crest, Newport Coast, County of Orange, California; letter by Petra Geotechnical, Inc., dated April 8, 2009. 4. Geotechnical Report of Precise Grading, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; report by Petra Geotechnical, Inc., dated May 5, 2010. 5. Geotechnical Review of Delta 1 Revision of Precise Grading Plans, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; letter by Petra Geotechnical, Inc., dated March 8, 2011. 6. Geotechnical Review of Delta 2 Revision of Precise Grading Plans, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; letter by Petra Geotechnical, Inc., dated January 24, 2012. 7. Geotechnical Review of Delta 3 Revision of Precise Grading Plans, Proposed Single -Family Residence, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; letter by Petra Geotechnical, Inc., dated May 1, 2012. 8. Final Soils Report, Foundation Observations, Utility Trench and Retaining Wall Backfill, and Slab Subgrades, Lot 15 of Tract 15346, 21 Avalon Vista, Newport Coast, County of Orange, California; report by Petra Geotechnical, Inc., dated February 19, 2013. 1 LOT 14 1 24" DRAINBOX: 1 W/ ULTRA -URBAN FILTER & SMART SPONGE MEDIA CONNECT TO - EXIST. 10" STORM DRAIN LOT J EXIST. 10"— STORM DRAIN N M 1'!' E 214Ar I I N 2Ti1W' E 1917r I I I I I LOT 18 I I0000' SCALE: 1" = 16' WQMP LEGEND WATER FEATURE LANDSCAPE AREA L� _ WATER QUALITY MANAGEMENT PLAN (WQI J RUNOFF FLOW DIRECTION REV N0. DESCRIPTION DATE BY APPVD. PROPOSED CONCRETE PAVING p ® p DRAIN INLET REVISED GRADING ZL PLAN BACKGROUND 1-12-12 B.O.R. C.R. TOAL EXISTING BUILDING = _ = PROPOSED DRAIN LINE �3ury Civil Engineers, Land Planners, Land Sf. REVISED GRADING PLAN BACKGROUND 4-24-12 B.O.R. C.R. 139 Avenida Navarro, San Clemente, Calif. n �,, _ - ., _ Tel: 949-492-8556 r___ non Ancs ocnc 1 1 0 sl 1 I I I