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Lo � %%./ <br /> 1.0 INTRODUCTION <br /> 1.1 BACKGROUND <br /> A 1,000-gallon unleaded gasoline underground storage tank (UST), piping and dispenser <br /> island were removed from the property at 2050 W. Fremont Street in August 1992. The <br /> results of tank closure and soil sampling were published by Kroeker Environmental Services <br /> on August 27, 1992. <br /> ,. Earth Tech was not present during the excavation, tank removal, and subsequent sampling. <br /> The owner of the property at the time reported that the tank appeared to be in good <br /> condition. <br /> low <br /> Samples collected from the bottom of the tank excavation by Twinings Laboratory <br /> indicated residual hydrocarbons in the soil, as summarized in Table 1 . <br /> .,► TABLE 1 <br /> Results of Soil Analysis Sampled Collected 8120192* <br />�. SOIL SAMPLE DEPTH BTEX (,ug/kg) TVPH-GASOLINE MTBE (,ug/kg) <br /> 11 (FEET) (ug/kg) <br /> S-1 (North Bottom) 11 None Detected None Detected Not Analyzed <br /> S-2 (South Bottom) 11 Benzene - ND 600 Not Analyzed <br /> Toluene - 37 <br /> Ethylbenzene - 46 <br /> Xylenes - 85 <br /> CS-1 (Stockpile) None Detected None Detected Not Analyzed <br /> "Source: Kroeker, 1992 <br />�* 1.2 SCOPE OF WORK <br /> The San Joaquin Public Health Services/Environmental Health Division (PHS/EHD) requested <br />+� a subsurface investigation be performed to evaluate the extent of petroleum impacted soil <br /> from the former UST, evaluate the need for remedial action, and to provide data that may <br /> be used for site closure. <br /> A detailed scope of work was presented in Earth Tech's Work Plan for Additional <br /> Subsurface Investigation in the Vicinity of the Former 1,000-gallon Gasoline Tank at the <br /> AM' National Advertising Company Facility, 2050 W. Fremont Street, Stockton, CA 95205, <br /> included in Appendix A. The proposed scope of work was approved by the PHS/EHD on <br /> February 12, 1998. <br /> 1 <br />