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, <br /> ' App/!ed GeOSlvsIems 4191-E P-11e, Inn Ro,id, S.rcr nwnlo,CA 95826 (916)452-2901 <br /> • FREMONT i IRVINE • HOUSTON • IIOSTON i SACRAMENTO @ CULVER CITY O SAN JOSE <br /> October 4, 1989 <br /> 0817rphi <br /> AGS 87048-2 <br /> Mr. Robert Phillips <br /> Sharbob, Inc. <br /> 11490 Alpine Road <br /> Stockton, California 95212 <br /> Subject: Letter report of quar!4rly groundwater monitoring at Beacon Service Station <br /> No. 22-1, 13975 1.14ghway 88-E, Lockeford, California. <br /> Mr. Phillips: <br /> This report summarizes results of the most recent groundwater monitoring that Applied <br /> Geo5ystems 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 (PIate <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. <br /> Shell Oil Company (Shell) operated the station unti11983. 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 operaies 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 contaminationin the <br /> ground water (Applied Geo5ystems Report 87048-1,July 13, 1987). On June lb, 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, iwn,dry wells shown on Plate P-2,,were present_on the soothe:n and'eastern <br /> corners.of the site and served'as ch.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. =Tlieasphalton the surface of the.property <br />