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a.. <br /> Advanced <br /> eoEnvlronmental , Inc . o <br /> 06 April 2012 RECEIVED <br /> AGE-NC Project No. 95-0184 <br /> APR 12 2012 <br /> Ms. Vicki McCartney EWRONMENTALHEALTH <br /> San Joaquin County Environmental Health Department -- <br /> 600 East Main Street <br /> Stockton, CA 95202 f <br /> f <br /> Subject: In-Situ Air Sparging Work Plan <br /> LARRY'S AUTO REPAIR <br /> 308 North Grant Street, Stockton, California <br /> Dear Ms. McCartney: <br /> At the request of Mr. Charles Skobrak, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared an updated remediation work plan for the site at 308 North Grant Street, <br /> Stockton, California. <br /> 1.0. BACKGROUND <br /> The site is located on the northeast corner of the intersection of Grant Street and Miner <br /> Avenue. The site is currently operated as Larry's Auto Repair and was formerly operated <br /> as De Rollo Mazda. The property is occupied by a single building with attached canopy and <br /> a parking area. In 1987, one 1,000-gallon gasoline underground storage tank (Tank Area <br /> #1) was removed from the northwestern corner of the site. One 1,000-gallon gasoline <br /> underground storage tank (UST) and one 1,000-gallon diesel UST (Tank Area #2) were <br /> removed from beneath the sidewalk at the southeastern corner of the site in 1990. <br /> Petroleum hydrocarbons were detected in soil samples collected beneath each UST. <br /> The upper portion of the site section consists of silty clay and clayey silt with sand lenses <br /> encountered d ri,n�,,���drilling and soil sampling (including cone penatration testing). The <br /> primary Ovate a�`ifi'Unit which can sustain ground water recharge is located at a depth <br /> of 60 feet below surface grade (bsg),the current groundwater table resides at 30 feet bsg; <br /> while the majority of the adsorbed contamination, with aromatic compounds is located '��A� <br /> within the upper section of the site. SG' .t�� t <br /> 2� <br /> The concentrations of dissolved constituents collected in southern UST area (MW-5) <br /> shallow well samples are greaterthan the intermediate and deeper monitoring wells(MW-4 <br /> / <br /> 837 Shaw Road • Stockton,CA 95215 1 T''t—109Telephone(209)467-1006 •Fax (209)467-1118 \ <br />