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I � <br /> f <br /> SEP 2 1 <br /> r <br /> EXECUTIVE SUMMARY P RMilTISER ICES <br /> The project site, which is the former Exxon service station at 3128 West Benjamin Holt <br /> Drive, is located in northwest Stockton, California, at the southeast corner of Grigsby <br /> PIace and West Benjamin Holt Drive, approximately 200 feet west of Interstate 5. The site <br /> is surrounded by a mixture of commercial and residential properties. The site is bounded <br /> by a shopping center and a Shell gasoline station to the north, a church and residential area <br /> to the west, a water tower, Seven-Eleven parking lot and store and residential area to the <br /> south and Interstate Highway 5 to the east. <br /> The site was an active Exxon Retail Service Station from 1968 to 1991. Three single- <br /> walled steel underground storage tanks previously containing gasoline and having a E <br /> capacity of 6,000 gallons, 8,000 gallons and 10,000 gallons are located in the northeast <br /> corner of the site. A 1,000 gallon waste oil tank is located in the southern portion of the F <br /> site, south of the station house/garage. According to a report by Engineering Science, Inc. <br /> (ESI) of Berkeley, California, all underground storage tanks on the property are original. ; <br /> PREVIOUS INVESTIGATIONS <br /> In March 1991 Engineering gineerrng Science, Inc. of Berkeley, California (ESI) drilled three soil <br /> borings at the site and converted them into 4=inch diameter groundwater monitor wells, MW_ <br /> 1, MW-2 and MW-3. Depth to groundwater was measured at approximately 14 feet below <br /> I ground surface. Groundwater flow direction is to the northeast. <br /> In June, 1991, Artesian Environmental Consultants (Artesian) conducted a Phase II <br /> subsurface investigation at the site to evaluate the vertical and lateral extent of the <br /> hydrocarbons detected in the soils in the previous investigation and the lateral extent of <br /> hydrocarbons detected in the groundwater. <br /> Four soil borings, B-4 through B-7, were drilled to a depth of 20 feet below ground surface. r <br /> Groundwater samples were collected from B-4 through B-7 using hydropunch sampling <br /> iv <br /> J, <br /> I <br /> st � t <br />