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r. <br /> r Ap���ed �s@D.rIJ/S�B/77S 4191-E Power 'nn Road, Sacramento, CA 95826 (916) 452-2901 <br /> O FREMONT e COSTA MESA O SACRAMENTO Y HOUSTON <br /> August 3 , 1988 <br /> 0728SEPP <br /> AGS Job No. 86091-6 <br /> Mr. Steve Epperson <br /> Beacon Oil Company <br /> 525 Third Street <br /> Hanford, California 93230 <br /> Subject: Letter Report of installation of vapor-recovery wells <br /> at Beacon Station No. 1-502, 35 North Cherokee Lane, <br /> Lodi, California. <br /> Mr. Epperson: <br /> A geologist from our office was present at the site referenced <br /> above on September 11 and 15, 1987, to drill four soil borings <br /> and install vapor-recovery wells. The work was implemented as <br /> part of Applied GeoSystems' environmental investigation outlined <br /> in our Work Plan (AGS Report 8691-6, dated May 26, 1987) . <br /> The site is located on the southwest corner of the intersection <br /> of North Cherokee Lane and Elm Street in Lodi, California. The <br /> site Vicinity Map, Plate P-1, shows the location of the service <br /> station. The tank cavity at the site contains one 10, 000-gallon <br /> and two 12,000-gallon underground storage tanks. The central <br /> tank failed a precision leak test and was subsequently replaced. <br /> Previous work indicated that soil immediately adjacent to and <br /> below the tank cavity is contaminated with hydrocarbons. Data <br /> obtained during installation of monitoring wells MW-1 through <br /> MW-5 suggest that soil contamination is limited to the area <br /> immediately adjacent to and below the tank cavity. <br /> Four vapor--recovery wells were installed at the site during this <br /> phase of work. As depicted on the Generalized Site Plan, Plate <br /> P-2, two wells were installed within the tank cavity and two <br /> wells were installed in native soil to the north and east of the <br /> tank cavity. The wells were installed in soil borings drilled by <br /> Datum Exploration, Inc. , of Pittsburg, California, using 8-inch- <br /> diameter, continuous-flight, hollow-stem augers. The augers were <br /> steam-cleaned prior to use in each hole to minimize the <br /> possibility of downhole or crosshole contamination. The drilling <br />