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b <br /> PROJECT QUARTERLY UPDATE REPORT <br /> _ <br /> 7-ELEVEN STORE <br /> 9110 THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> MAY 5, 19B9 <br /> INTRODUCTION <br /> This report presents a quarterly update of the services <br /> conducted by Groundwater Technology, Inc. (GTI) at the 7-Eleven <br /> Store No. 20680, located at 9110 Thornton Road in Stockton, <br /> California (Figure 1) . As shown on the Site Plan (Fig,:.e 2) , the <br /> store is situated on the northern corner of Thornton Road and <br /> Waudman Avenue in a mixed commercial and residential area. This <br /> report summarizes work performed between January 19, 1989 and <br /> March 28, 1989. <br /> BACKGROUND <br /> In April 1986, GTI was retained by Southland Corporation to <br /> conduct a subsurface investigation of a suspected unleaded- <br /> gasoline release at the above-mentioned location. The unleaded- <br /> product system failure was detected in a precision tank system <br /> test on March 28, 1986. The unleaded-tank and distribution <br /> system was then shut down April 2, 1986. On May 5, 1986, <br /> excavations at the site to expose product and vapor lines <br /> indicated that the source of the product loss was a product line <br /> located beneath the cement slab adjacent to the pump islands. <br /> In order to assess the lateral and vertical-extent of <br /> contamination, four groundwater-monitoring wells (MW) MW-1, MW-2, <br /> MW-3, and MW-4 were installed on May 6 and 7, 1986. In late May <br /> C:R�il'ti USI;ITF.It <br /> i Tl:c►��l�l.rlc v,lac. <br />