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5 <br /> bwir I <br /> it ♦ <br /> t . <br /> 4. SUMMARY AND CONCLUSIONS <br /> From the time a product line leak was identified in late 1985 <br /> generally continuous series Of site investigations has occurreda. <br /> at the site of former EXXON station 7-1050 in Stockton, <br /> California. The important and relevant conclusions of the work <br /> completed to date are: <br /> ' 1 • Ground water gradient at the site is <br /> northeast, generally to the <br /> T 2. There is no history of free <br /> at this site. Product on the water table <br /> j <br /> 3• Soils to a depth of 20 feet a f <br /> benzene, 'ppear to be Free of <br /> a characteristicallyaxylene, <br /> associated with are compounds <br /> �. contamination. gasoline <br /> f; 4- Ground-water monitoring .has documented a progressive <br /> decline in hydrocarbon constit <br /> Februar uents beneath this site. <br /> Y 1988 samples contained detectable low levels of <br /> benzene and other volatile constituents only in Mw3 <br /> i (site of the former tank field) . <br /> 1 Taken together, the SVCA and soil boring g data are evidence of <br /> y .uncontaminated soil. The declining groundwater <br /> hydrocarbons suggest that'natural degradation and dispersion <br /> f processes, coupled with initial excavation of the site has <br /> largely mitigated the previous hydrocarbon contamination. <br /> 4 <br /> 6 <br /> r <br /> wigsi - <br />