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5 ' <br /> d. <br /> July 8, 19Fi8 AGS Job No. 38032-2 <br /> P' UNOCAL Service Station No. 6981, Stockton, California <br /> 11726 ppm at 18 feet and 1,407 at 19 feet below grade in two <br /> separate locations with subjective indication of contamination. <br /> Soil samples collected from other locations with no subjective <br /> indication of contamination were less than Method detection <br /> r limits. <br /> ' an June 14, 1988, a geologist from Applied OeoSystems was present . <br /> a at the site to observe removal of the underground storage tanks <br /> and collect soil samples from beneath the base of the tanks. <br /> r: <br /> Samples collected from beneath the tanks indicated that <br /> hydrocarbon contamination was present within the soil. In <br /> response to these results, an excavation was conducted to remove <br /> t <br /> contaminated soil to the extent possible. Results from this <br /> excavation indicate that hydrocarbon contamination remains in the <br /> i <br /> soil in the center and the northeast corner of the excavation. <br /> The three underground gasoline storage tanks were replaced with <br /> v <br /> two new tanks, and a conductor casing was set between the tanks <br /> to allow drilling at a later date without risk of damaging the <br /> t rew tanks. <br /> ' v <br /> 4 <br /> hd <br /> Applied GeoSysteme <br />