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45 E Harding Way, Stockton, California March 14, 1994 <br /> Chevron USA Products Company Page 1 <br /> 1.0 INTRODUCTION <br /> This report Is submitted by Groundwater Technology, Inc on behalf of Chevron U S A Products <br /> Company (Chevron) to summarize the methods and results of additional soil and groundwater <br /> assessment and to document the results of the most recent quarterly groundwater monitoring and <br /> sampling event conducted at the former Chevron service station #9-1918 located at 45 East Harding <br /> Way in Stockton, California (Figures 1 and 2) The scope of work included drilling and sampling five soil <br /> bonngs, groundwater monitoring well installation in two of the borings, groundwater monitoring and <br /> sampling, and preparation of this report Five soil borings were drilled to achieve the following <br /> objectives <br /> ■ Three confirmation sod borings drilled and sampled in the vicinity of the former <br /> underground storage tanks (Figure 2) to determine the effectiveness of the former vapor <br /> extraction system on remediation of hydrocarbon-impacted soil <br /> ■ One boring/groundwater monitoring well (MW-2R) to replace MW-2, which has been <br /> dry since June 1990 <br /> ■ One boring/monitoring well (MW-14) to further define the downgradient boundary of <br /> hydrocarbon-impacted groundwater <br /> The work described in this report was completed at the site from December 13, 1993 through <br /> January 26, 1994, according to the work scope outlined in Groundwater Technology's Work Plan for <br /> Additional Sod and Groundwater Assessment dated October 11, 1993 accepted by the San Joaquin <br /> i <br /> County Public Health Services, Environmental Health Division (SJCPHS-EHD) <br /> ❑❑� GROUNDWATER <br /> 48955UM RPT ❑❑❑ TECHNOLOGY . <br />