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PROTECT QUARTERLY UPDATE REPORT <br /> 7-ELEVEN STORE <br /> 9110 THORN'TON ROAD <br /> STOCKTON, CXLIFORNIA <br /> AUGUST 1989 <br /> INTRODUCTION <br /> This report presents a quarterly update of the services <br /> conducted by Groundwater Technology, Inc. (GTI) at the 7-Eleven <br /> 9110 Thornton Road in Stockton, <br /> Store No. 20680; located at <br /> e 1) . As shown on the Site Plan (Figure 2) , the <br /> California (Figur <br /> rnton Road and <br /> store is situated on the northern corner of Tho <br /> waudman Avenue in a mixed commercial and residential area. This <br /> i <br /> report summarizes work performed between April 4, 1989 and <br /> mune 27, 1989. <br /> it <br /> t BACKGROUND <br /> In April 1986, GTI was retained by Southland Corporation to <br /> conduct a subsurface investigation of a suspected unleaded <br /> - <br /> t the above-mentioned location. The unleaded- <br /> gasoline release a <br /> product system failure was detected in a precision tank system <br /> test on March 28, 1986. The unleaded-tank and dist <br /> ibution <br /> r <br /> system was then shut down April 2, 1986. On May S, 1986, excava- <br /> and <br /> icated <br /> tions at the site to expose produc5 was aapor productelinedlocated <br /> that the source of the product los <br /> beneath the cement slab adjacent to the pump islands. <br /> In order to assess the lateral and vertical-extend 1, M14-2, <br /> contamination, four groundwater-monitoring wells (MW) <br /> _. MW-3, and MW-4 were installed on May 6 and 7, 19B6. In late May <br /> GHtt!\r MER <br />