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1.0 INTRODUCTION., � <br /> 1.1 BACKGROUND 7 <br /> A 1,000-gallon unleaded gasoline underground storage tank (UST), piping and dispenser island were <br /> removed from the property at 2050 W. Fremont..Street-h 'Aucust 1992. The results of tank - removal <br /> emo al <br /> sampling were published by Kroeken;'Environniental Services in Au-ust.27, 1992. <br /> Earth Tech was not present during the .tank excavation. .removal, or subsequent sampling and <br /> assessment. The owner of the property at the time reported that the UST appeared to be in good <br /> condition_ <br /> Samples collected from the bottom of the..tank.excavation were analyzed by Twinings .Laboratory. <br /> These samples indicated residual hydrocarbons in the soil, as summarized in Table 1. <br /> TABLE 1 <br /> i <br /> Results of Soil Analysis Sampled Collected $120192 * ;. <br /> Soil Sample Sample Depth BT.EX <br /> p t p (erg/kgj TVPH-Gasoline. MTBE'(/ug/kg) <br /> (feet bgs) (ug/kg) <br /> S-1 (North Bottom) I l None Detected None Detected Not Analyzed <br /> S-2 (South Bottom) l I Benzene- ND 600 Not Analyzed <br /> Toluene - 37 <br /> Ethylbenzene - 46 . <br /> Xylenes 85 <br /> CS-1 (Stockpile) <br /> None Detected None Detected Not Analyzed- <br /> *Source: Kroeker, 1992. y <br /> 1.2 OBJECTIVES <br /> As requested by the San Joaquin Public Health ' Services/Environmental Health Division <br /> (PHS/EHD),the proposed subsurface investigation is intended to evaluate the extent of petroleum <br /> impacted soil from the former UST; to evaluate the need for.remedial action; and to provide data that ' <br /> may be used for site closure. <br /> f <br /> I <br /> 1 i <br />