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i <br /> Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT Y IRVINE O HOUSTON • BOSTON 0 SACRAMENTO b CULVER CITY i SAN JOSE <br /> June 30, 1989 <br /> 0324SEPP <br /> AGS 86091-6 <br /> Mr. Steve Epperson <br /> Beacon oil Company <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Letter report of quarterly ground-water monitoring for <br /> 1st Quarter, 1989, at Beacon Station No. 1-502, 35 <br /> North Cherokee Lane, Lodi, California. <br /> Mr. Epperson: <br /> At the request of Beacon Oil Company (Beacon) , we are presenting <br /> this letter report summarizing the methods and results of the <br /> quarterly ground-water monitoring performed by Applied GeoSystems <br /> at 1_1�sacon Station No. 1-502 , 35 North Cherokee Lane, Lodi, <br /> California. The site is located on the southwest corner of the <br /> intersection of North Cherokee Lane and Elm Street in Lodi, as <br /> shown on the Site Vicinity Map (Plate P-1) . This work was <br /> performed as part of an ongoing environmental investigation <br /> Aoutlined in Applied GeoSystems' Work Plan No. 86091-3 , <br /> November 7, 1986. <br /> Several previous environmental investigations have been performed <br /> at this site. At the request of Beacon, Applied Geosystems <br /> conducted an initial subsurface Environmental Investigation at <br /> the site in response to a failed precision leak test of a 10,000- <br /> gallon tank formerly used to store diesel. (AGS Report No. <br /> 86091-^-3, October 28, 1986) . That tank was replaced in September <br /> 1986; two existing 10,000-gallon gasoline tanks were lined and <br /> remained in place. During a subsequent investigation, Applied <br /> GeoSystems installed four ground-water monitoring wells (MW-1 <br /> through MW-4) at the site, and selected soil and ground-water <br /> samples were analyzed for hydrocarbon contamination (AGS Report <br /> No. 86091--3, dated November 7, 1986) . The results of laboratory <br /> analyses of soil samples indicated that hydrocarbon contamination <br /> was limited to the area immediately adjacent to and below the <br /> tank cavity. Laboratory analyses of ground-water samples <br /> indicated that ground water underlying the site had been affected <br /> by gasoline contamination. In March 1987, an additional <br /> monitoring well (MW-5) was installed downgradient to evaluate <br /> further the extent of the contamination (AGS Report No. 86091-6, <br />