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Background <br /> The site includes three 12, 000 gallon steel underground storage <br /> tanks . Presently, the tanks store regular unleaded, super <br /> unleaded, and premium unleaded gasoline. The station has three <br /> service islands, each with a vapor recovery system. <br /> USA Gasoline Corporation has installed 10 monitor wells in the <br /> course of the investigation of this site. Six of these wells are <br /> located within the USA property boundaries and four wells are <br /> located to the south in a downgradient direction (see Figure 3) . <br /> After the existing wells were in place (excluding MW8) , a Problem <br /> Assessment Report was prepared December 5, 1989 . This report was <br /> included in Appendix A of the Quarterly Monitoring Report of <br /> September 24 , 1991 . It presented Soil Boring analysis, Ground <br /> water analysis, Ground water flow direction, Aquifer test data <br /> with an estimate of transmissivity and hydraulic conductivity, <br /> and an evaluation of the zero line of contamination. <br /> On February 8, 1993 , MW8 was installed eight feet southeast of <br /> the tank field. This location was in a hydraulic downgradient <br /> direction from the tank field (see Figure 3) . A Limited Drilling <br /> Report was prepared on February 25, 1993 to document the methods <br /> and procedures used to construct the well . That report was <br /> included as Appendix C of the May 4, 1993 Quarterly Monitoring <br /> Report . The well was sampled for the first time on March 31, <br /> 1993 . <br /> Western Geo-Engineers was contracted by USA Gasoline Corporation <br /> to perform a one day Vapor Extraction Feasibility Test . On March <br /> 14 , 1995 four monitor wells were tested, MW4, S1, S2 and MW8; the <br /> results from this limited test suggests that Vapor Extraction <br /> (V. E. ) is a viable mitigation technique for this site . The <br /> findings are presented in the 'Results of Pilot Test for Vapor <br /> Extraction' report dated April 17, 1995 . <br /> GEOLOGY <br /> The deposits under the site are Recent to Pleistocene age <br /> alluvium and consist of lenticular silt, sand, gravel and clay <br /> representing a heterogeneous fluvial environment . The Problem <br /> Assessment Report for this site (Appendix A of the Quarterly <br /> Monitoring Report for September 24, 1991) details the local and <br /> regional geology and hydrogeology. The soil samples and drill <br /> cuttings from MW8 indicated similar lithologies to those <br /> presented in the Problem Assessment Report . <br /> 2 USA 65 Mar. 195 Qtr Rpt <br /> Lr <br />