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S <br /> ' I <br /> Onsite and Offsite Assessment Report 7 <br /> The Southland Corporation,2725 Countty Club Boulevard Stockton California November 34 1998 <br /> The majority of the dissolved hydrocarbon plume has been identified to lie in the vicinity of the former <br /> underground storage tank area,and is not laterally extensive downgradient(northeast) of the <br /> hydrocarbon source area. There do not appear to be chlorinated hydrocarbons present in groundwater <br /> beneath the site,with the exception of species normally associated with gasoline. Dissolved MTBE was <br /> not detected in the Southland tank pit areas during this investigation, and was only found in water from <br /> borings collected near the edge of the property line shared with the LISAlExxon site. <br /> Local utilized wells within 2,000 feet of this site do not appear to be at risk due to dissolved <br /> hydrocarbons, as most identified are perforated at depths starting at more than 100 feet below grade, <br /> and the plume appears to be confined primarily to the immediate tank vicinity. Furthermore,dissolved <br /> MTBE levels were very low in all the water samples collected (less than 25 ug/L). <br /> I <br /> I <br /> r <br /> i <br /> S <br /> 14117sar.rpt <br /> ra <br /> FLUOR DANIEL GTI <br /> } <br /> { <br />