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MIMI <br /> Chevron U.SA. <br /> Page 1 <br /> i <br /> ¢ 1.0 INTRODUCTION <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, Ctilalifornia(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 /> l a <br /> i The subject property was developed as a Chevron Service Station until it was <br /> t razed in 1985. All underground piping and fuel storage tanks were removed at that <br /> F; 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 /> ._ , <br /> 1 F'yy and 30 feet below grade)at the site contained minor Ievels 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 /> l ' 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 /> 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 /> workplan, Dames& Moore released a summary report on August 31, 1989. The report <br /> i concluded that residual petroleum contamination was generally limited to the upper 20 <br /> feet of the soil horizon. It was also concluded that groundwater,enecuntered at a <br /> depth of about 71 feet below grade, did not contain detectable concentrations of <br /> petroleum hydrocarbons. <br /> Mcac,riE: <br />