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D <br /> -5 7T 717-us 3330 Cameron Park Drive, Ste 550 <br /> ENVIRONMENTAL,iNC. Cameron Park, California 95682 <br /> (530)676-6004-Fax:(530)676-6005 <br /> September 21, 2005 <br /> Project No. U6100-15-1 <br /> AP 2 5 2005 <br /> :T"I )NMENTHEALIN <br /> FERMI?/SERVICES <br /> Mr.Nuel Henderson, P.G. <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Additional Site Assessment Work Plan <br /> Former ARCO Service Station No. 6100 <br /> 25775 Patterson Pass Road <br /> Tracy, California <br /> Dear Mr. Henderson: <br /> On behalf of Atlantic Richfield Company (ARCO, a BP-affiliated company), Stratus <br /> Environmental, Inc. (Stratus) has prepared this Additional Site Assessment Work Plan <br /> (Work Plan) for former ARCO Service Station No. 6100 (the site), located at 25775 <br /> Patterson Pass Road, Tracy, California (Figure 1). In a letter dated August 11, 2005, San <br /> Joaquin County Environmental Health Department (SJCEHD) requested a work plan to <br /> further investigate the extent of subsurface petroleum hydrocarbon impact adjacent to the <br /> service station property. The August 11, 2005 letter directed that the lateral extent of free <br /> phase liquid hydrocarbon (free product) be further investigated, and that additional wells <br /> be installed downgradient of the site to allow for additional monitoring and sampling of <br /> groundwater. <br /> Stratus is proposing to complete an additional subsurface investigation in two phases. <br /> The initial phase involves advancing five continuously cored exploratory soil borings to <br /> enable collection of soil samples and further characterization of soil conditions. <br /> Following completion of the borings, and a review of analytical data, a network of <br /> appropriately screened monitoring wells will be installed. Details associated with <br /> completing the proposed site assessment activities are described in the following <br /> subsections of this Work Plan. <br /> SITE DESCRIPTION <br /> The site is currently an active 76-branded service station (formerly operated as ARCO <br /> Service Station No. 6100) located approximately 700 feet west of the intersection of <br /> Patterson Pass Road and Interstate 580 near Tracy, California. The facility configuration <br /> KABp-Arco for URS\6100\Work Plans\arco6100-workplan 09-2005.doc <br />