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R <br />. INTRODUCTION <br /> In response to the request of the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD), Thrifty Oil Company conducted a site assessment investigation at <br /> Thrifty Service Station 171 between December 1994 and June 1995 The site is located at 1250 <br /> North Wilson Way in Stockton, California (Figure 1) The purpose of this investigation is to <br /> further define the extent of hydrocarbon contamination found previously in the subsurface soils <br /> and groundwater The scope of work for tlus investigation was presented in Thrifty's Workplan <br /> for Additional Site Assessment dated December 5, 1994 This plan included installation of four <br /> groundwater monitoring wells, six vapor extraction wells and three soil borings at the site This <br /> plan was approved by PHS/EHD in December 1994 <br /> The site is operated as a self-service gasoline sales facility by Thrifty Oil Company and features a <br /> cashier's booth, three product dispenser islands, and three new double-walled fiberglass <br /> underground tanks (Figure 2) The new tanks were installed in November 1994 and are located <br />• near the northeastern corner of the site These tanks replaced five steel underground tanks that <br /> were located in the southwestern portion of the site The site has been operated as a service <br /> station for at least 25 years and there are no plans for alternate site uses <br /> Previous Investigations <br /> Hydrotech Consultants, Inc performed the initial investigation at the site in December of <br /> 1987 The details of this investigation are presented in the Hydrotech report titled <br /> `Limited Subsurface Investigation, Thrifty Oil Company Station No 171, 1250 N Wilson <br /> Way, Stockton, California". dated January 7, 1988 The investigation consisted of <br /> advancing four (4) exploratory borings (B 1, B2, B3, and 134) to depths of 20 feet below <br /> grade surface (bgs) near the underground storage tanks Laboratory results of selected <br /> samples indicated the presence of a maximum of 1,983 mg/kg total petroleum <br /> hydrocarbons (TPH) in one soil sample at 10 feet bgs <br /> Page 1 <br />