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R <br /> �. • rr� F�^t <br /> INTRODUCTION <br /> This report presents the results of Groundwater Technology's <br /> hydrocarbon investigation at the Exxon Service Station in <br /> Stockton, California. The site is located on the northwest <br /> corner of the intersection of Hammer bane and Lower Sacramento <br /> Road (See Figure 1, Site Loc <br /> pr anon Map) . <br /> i Three 8,000allon <br /> g underground stowage tanks, the oldest of <br /> which was installed in 1967, served the station. On November 13, <br /> 1535, a Red Jacket Line Leak Detection system was installed to <br /> f monitor the fuel lines running between the storage tanks and the <br /> PUMP islands. On November 27, 1985, the .station owner reported <br /> ; <br /> �F problems with priming the fuel pumps in the mornings, indicating ; <br /> a .potential pressure leak. The fuel lines were tested on <br /> December 3 through. 5, 1986 and failed. It was.at this :time that , <br /> I Exxon Company, U.S.A. closed the station and initiated an ti`I <br /> investigation of the problem. On December 17, 1985; Groundwater <br /> Technology was retained by Exxon to investigate the possibility. a <br /> of groundwater contamination by hydrocarbons leaking from the <br /> underground fuel lines at the service station. In January of ' <br /> 1986, the scope of work was modified to include soil sample <br /> } <br /> collection and analysis in order to meet the site closure ' <br /> ! requirements .of the San Joaquin Local Health District. <br /> WORK PERFORMED <br /> To date, Groundwater Technologyhas <br /> provided the following <br /> services: <br /> A brief hydrogeologic 'survey .of the site has been <br /> conducted. <br /> $ ° Two monitoring wells were installed. . <br /> It <br /> �j <br /> MMM <br />