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139 South Center Street, Stockton, California June 28, 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 assessment conducted at <br /> the4e;=r Chevron service station #"557 located at 139 South Center Street in Stockton, California <br /> (Figures 1 and 2). The scope of work Included drilling and sampling five soil borings, and preparation of <br /> this report. Specifically, the five soil borings were drilled to achieve the following objectives: <br /> ■ One boring (SB-1) was drilled to determine the extent of hydrocarbon-impacted soil <br /> immediately to the south of the pump island farthest from the service station building <br /> (Figure 2). <br /> ■ Three borings (SB-2, 3, and 4) were drilled to further define the horizontal and vertical <br /> extent of impacted soil in the vicinity of former underground storage tanks (USTs) <br /> located south of the station building. <br /> X An additional boring, SB-5, was drilled to investigate soil beneath the former used-oil <br /> tank located near the northwest corner of the station building. <br /> The work described in this report was completed at the site on May 12 and 13, 1994, according to the <br /> work scope outlined in Groundwater Technology's Work Pian for Additional Soil Assessment, dated <br /> April 12, 1994, and accepted by the San Joaquin County Public Health Services-Environmental Health <br /> Division (SJCPHS-EHD). <br /> GROUNDWATER <br /> 5039SUM.F;Frr , ._ TECHNOLOGY <br />