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� til Advanced GeoEnvironmental , Inc . -; - 07 June 2012 RECEIVED AGE-NC Project No. 95-0184 JUN 18 2012 Ms. Vicki McCartney 6WIR0NINEW,4LHEALTH Mr. Nuel Henderson PERMR/SE San Joaquin County Environmental Health Department RVICES 1868 East Hazelton Avenue Stockton, CA 95205 Subject: In-Situ Air Sparging/Soil Vapor Extraction Remediation Work Plan LARRY'S AUTO REPAIR 308 North Grant Street, Stockton, California Dear Ms. McCartney: At the request of Mr. Charles Skobrak, Advanced GeoEnvironmental, Inc. (AGE) has prepared an updated remediation work plan for the site at 308 North Grant Street, Stockton, California. 1.0. BACKGROUND The site is located on the northeast corner of the intersection of Grant Street and Miner Avenue. The site is currently operated as Larry's Auto Repair and was formerly operated as De Rollo Mazda. The property is occupied by a single building with attached canopy and a parking area. In 1987, one 1,000-gallon gasoline underground storage tank (Tank Area #1) was removed from the northwestern corner of the site. In 1990, one 1,000-gallon gasoline UST and one 1 ,000-gallon diesel UST (Tank Area #2) were removed from beneath the sidewalk at the southeastern corner of the site. Petroleum hydrocarbons were detected in soil samples collected beneath each UST. The upper portion of the site section consists of silty clay and clayey silt with sand lenses encountered d rin drilling and soil sampling (including cone penatration testing). The primary water bWhanit which can sustain ground water recharge is located at a depth of 60 feet below surface grade (bsg), the current ground water table resides at feet bsg; while the majority of the adsorbed contamination, with aromatic compounds is located within the upper section of the site. 837 Shaw Road• Stockton, CA 95215 Telephone(209)467-1006 • Fax (209)467-1 1 1 8