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PROJECT UUARTHRLY UPDATE REPORT <br /> 7—ELEVEN STORE <br /> 9110 THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> NW4FJOER 2, 1989 <br /> IN'T`RODUCTION <br /> This report presents a quarterly update of the services <br /> -° conducted by Groundwater Technology, Inc. (GTI) at 7-Eleven Store <br /> No. 20680, located at 9110 Thornton Road in Stockton, California <br /> (Figure 1) . As shown on the Site plan (Figure 2) , the store is <br /> situated on the northern corner of Thornton Road and Waudman <br /> Avenue in a mixed commercial and residential area. This report <br /> summarizes work performed between July 6, 1989 and <br /> September 26, 1989. <br /> s=s BACKGROUND <br /> In April 1986, GTI was retained by Southland Corporation to <br /> E.; 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 /> c <br /> test on March 28, 1986• The unleaded-tank and distribution <br /> system was then shut down April 2, 1986. On May <br /> 5, 1986, excava- <br /> d vapor lines indicated <br /> tions at the site to expose product an <br /> that the source of the product loss was a product line located <br /> s ' beneath the concrete slab adjacent to the pump islands. <br /> i., In order to assess the lateral and vertical-extent of NSi�1�2► <br /> contamination, four groundwater-monitoring wells (MW) MW-1, <br /> 1986. In late May <br /> MW-3, and MW-4 were installed on May 6 and 7, <br /> Gxa�nx.crt:rc <br /> "" Fi11\Ui 061.IN <br />