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Ems <br /> Chc%-Ton U.S.A. <br /> Page 1 <br /> 1.0 IN"RODUCTION <br /> This report summarizes Dames& Moore's observations of the soil aeration <br /> at Chevron Service Station Number 9-6155,located at Highway 99 and Morada Lane in <br /> Stockton, California(Plate 1, Vicinity Map). This report has been prepared by Dames <br /> &Moore at the request of Chevron U.S.A. <br /> 2.0 PROJECT OVERVIEW <br /> The subject property was developed as a Chevron Service Station until it was <br /> m razed in 1986. All underground piping and fuel storage tanks were removed at that <br /> time. Woodward Clyde Consultants prepared an environmental assessment report for <br /> Chevron U.S.A- dated September 2, 1988. The report concluded that shallow soil (20 <br /> and 30 feet below grade)at the site contained minor levels of petroleum constituents <br /> and that the chemical quality of the groundwater was not known. <br /> The Environmental Health Division of the San Joaquin County Health Services <br /> required that Chevron U.S.A. conduct further studies of the site to assess the extent <br /> of soil contamination by gasoline related petroleum. On behalf of Chevron U.S.A., <br /> j Dames&Moore prepared a workplan for the installation of groundwater monitoring wells <br /> — at the property, dated March 12, 1989. Upon completion of the study outlined in the <br /> work-plan,Dames& Moore released a summary report on August 31, 1989. The report <br /> concluded that residual petroleum contamination was generally limited to the upper 20 <br /> feet of the soil horizon. It was also concluded that groundwater, encountered at a <br /> - depth of about 71 feet below grade; did not contain detectable concentrations of - <br /> petroleum hydrocarbons. <br /> - 15000-250-044 - - - <br /> MOORE <br /> I <br />