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ISGTH <br /> environmental SOURCE GROUP, INC. <br /> January 9, 2015 <br /> Mr. James L.L. Barton, P.G. <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Subject: Off-Site Investigation Work Plan <br /> Former Countryside Market <br /> 10848 Copperopolis Road <br /> Stockton, CA 95215 <br /> EAR: #R10-129 <br /> Dear Mr. Barton: <br /> On behalf of the California Regional Water Quality Control Board — Central Valley Region <br /> (CRWQCB) and the Department of General Services (DGS), The Source Group, Inc. (SGI) has <br /> prepared this Off-Site Investigation Work Plan (Work Plan) for the Former Countryside Market <br /> located at 10848 Copperopolis Road in Stockton, California, referred to as Emergency <br /> Abandonment and Recalcitrant (EAR) Site No. (R10-129, Site, Figure 1). This Work Plan has <br /> been prepared in response to CRWQCB electronic mail correspondence dated November 24, <br /> 2014 (Attachment A). The objective is to characterize the vertical extent of petroleum <br /> hydrocarbon impacted groundwater down-gradient of domestic well 10967, located at 10967 <br /> Copperopolis Road, Stockton, California. <br /> BACKGROUND <br /> The Site is located in eastern San Joaquin County, approximately two miles east of the city <br /> limits of Stockton, and southeast of the intersection of Copperopolis Road and Tulsa Road, The <br /> Site vicinity is primarily rural residential and agricultural. The Site is vacant with the current <br /> owner occupying a single-family residence on a separate parcel of land directly south of the <br /> Site. Countryside Market, a former gasoline service station and convenience store occupied the <br /> property until about 1993. All records indicate the property has been vacant since early 1993. <br /> In March 1993, Stockton Service Equipment Co. removed two 1,000-gallon leaded gasoline <br /> underground storage tanks (USTs) from the property. Four soil samples (TK1N, TK1S, TK2N, <br /> and TK2S) were collected from beneath the USTs at depths of approximately 7.5 feet below <br /> ground surface (bgs). The samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), ethylene dibromide (EDB), and <br /> total lead. TPHg was detected in all four samples at concentrations ranging from 770 to 6,500 <br /> 944 McCourtney Road, Suite H Telephone: (530) 272-4200 <br /> Grass Valley, California 95949 Facsimile: (530)272-4211 <br />