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S <br /> 1� <br /> Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> y • FREMONT • IRVINE • HOUSTON • BOSTON • SACRAMENTO • CULVER CITY • SAN )OSE <br /> I <br /> i <br /> October 4, 1989 <br /> 0817rphi <br /> AGS 87048-2 <br /> y Mr. Robert Phillips <br /> Sharbob, Inc. j <br /> 11490 Alpine Road <br /> Stockton, California 95212 <br /> Subject: Letter report of quarterly ground-water monitoring at Beacon Service Station <br /> No. 22-1, 13975 Highway 88-E, Lockeford, California. <br /> Mr. Phillips: <br /> This report summarizes results of the most recent ground-water monitoring that Applied <br /> ry GeoSystems is conducting at Beacon Station No. 22-1 in Lockeford, California. The site <br /> is 3 blocks east of Tully Road and Highway 88 as shown on the Site Vicinity Map (Plate <br /> P-1). The approximate configuration of the station facilities, including three underground <br /> product-storage tanks, is depicted on the Generalized Site Plan (Plate P-2). The tanks are <br /> labeled T-1 through T-4. We understand from Beacon Oil Company personnel that the two <br /> western tanks, T-1 and T-2, each 8,000 gallons, store premium unleaded and regular <br /> unleaded gasoline. The two eastern tanks each store 5,000 gallons of regular leaded <br /> gasoline. It is our understanding from Mr. Phillips that the underground tanks have passed !, <br /> annual precision tests. i <br /> Shell Oil Company (Shell) operated the station until 1983. Mr. and Mrs. Robert Phillips <br /> (Sharbob Inc.) purchased the property from Shell in 1983. Beacon Oil Company currently <br /> leases the property from Sharbob and operates the service station. At the request of <br /> Sharbob, Applied GeoSystems installed four 2-inch-diameter ground-water wells in June <br /> 1987. This phase of work indicated the presence of hydrocarbon contamination in the <br /> ground water (Applied GeoSystems Report 87048-1, July 13, 1987). On June 16, 1987, the <br /> ground water flow direction was evaluated to be to the southeast. The results of laboratory <br /> analyses indicated a benzene level of 0.0432 part per million (ppm) in well MW-3 and 0.147 <br /> ppm benzene in well MW-2 which is downgradient from MW-3. <br /> At that time, two dry wells shown on Plate P-2, were present on the southern and eastern <br /> corners of the site and served as catch basins for station runoff. These wells may have <br /> served as conduits extending from the surface to the ground water, and allowed <br /> contaminated water to reach ground water. The asphalt on the surface of the property <br /> f <br />