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4 . SUMMARY <br /> From the time a product line leak was identified in late 1985, a <br /> series of site investigations have been conducted at the site of <br /> former Exxon RS 7-1050 in Stockton, California. The important <br /> and relevant conclusions of the work completed to date are: <br /> I . Groundwater gradient at the site is consistently to the <br /> i' <br /> northeast. <br /> 2. 'There is no history of free product on the water table <br /> at this site. <br /> } <br /> 3. Soils to a depth of 20 feet appear to be free of ben- <br /> . , <br /> zene, toluene, and xylene, which are compounds <br /> ,cf charac <br /> teristicallY associated with gasoline contamination. - <br /> 3 <br /> x <br /> 4. Groundwater monitoring has documented a progressive <br /> decline in hydrocarbon constituents beneath this site. <br /> Since February 1988, samples of groundwater from MW3 <br /> have been the only samples to contain concentrations of <br /> benzene and other- volatile constituents. greater than the <br /> 5 <br /> detection limits (site of the former. tank field) . <br /> Taken together, the SVCA and soil boring data are evidence of <br /> relatively. uncontaminated soil . The declining groundwater hydro- <br /> carbons suggest that natural degradation and dispersion pro- <br /> cesses, 'coupled with initial excavation of the site, has largely <br /> mitigated the previous hydrocarbon.-contamination <br /> r e25/71050/txt 5 <br /> V . . <br />