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l <br /> Page 3 <br /> 2 . BACKGROUND <br /> 2. 1 SITE SETTING <br /> The project site is located in northwest Stockton, California at the southeast corner of <br /> Grigsby Place and West Benjamin Holt Drive,approximately 200 feet west of Interstate 5. <br /> The site is surrounded by a mixture of commercial and residential properties. The site is <br /> bounded by a shopping center and a Shell gasoline station to the north, a church and <br /> residential area to the west,a water tower,Seven-Eleven parking lot and store and <br /> residential area to the south and Interstate Highway 5 to the east. <br /> The site was an active Exxon Retail Service Station from 1968 to I99I. Three single- <br /> walled steel underground storage tanks containing gasoline and having a capacity of 6,000 <br /> gallons, 8,004 gallons and 10,000 gallons are located in the northeast corner of the site <br /> • (Figure 2). A 1,000 gallon waste oil tank is located in the southern portion of the site, <br /> 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 /> 2.2 PREVIOUS INVESTIGATIONS <br /> In March, 1991,Engineering Science,Inc. of Berkeley, California(ESI)drilled three soil <br /> borings at the site and converted them into 4-inch diameter groundwater monitor wells, <br /> MW-1, MW-2 and MW-3. Figures, tables and well Iogs from the ESI April, 1991 report <br /> are included in Appendix A. Soil and groundwater samples were analyzed for total <br /> petroleum hydrocarbons (TPH-g)as gasoline and benzene, toluene,ethylbenzene and <br /> xylenes (BTEX). TPH-g were detected in a soil sample from MW-I at a depth of I 1 feet at <br /> concentrations of 12 pans per million (ppm). TPH-g,ethylbenzene and xylenes were <br /> detected in a soil sample from MW-2 collected at 14 feet at concentrations of 1,500 ppm, <br /> 2,000 parts per billion (ppb)and 6,000 ppb,respectively. BTEX were detected in the <br /> groundwater san7ple from MW-2 at concentrations of 760 ppb,40 ppb, 50 ppb and 110 <br /> ppb,respectively. All other analytes were not detected. Depth to groundwater on the site <br />