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yr <br /> RM <br /> July 28, 1988 AGS Job No. 38012-2 <br /> Former UNOCAL Service Station, Stockton, California <br /> benzene, which is slightly above the limit of 0.0007 ppm <br /> established by the California Department of Health Services for <br /> safe drinking water. Water from monitoring well M14-3 contained <br /> levels of toluene, ethylbenzene, and total xylene isomers that <br /> were within recommended maximum concentrations. Water from <br /> monitoring well MW-2 contained 99 ppm TPH and levels of BTEX <br /> above recommended maximum concentrations. <br /> -w <br /> CONCLUSIONS AND RECOPMENDATIONS <br /> The distribution and levels of hydrocarbon contaminants <br /> encountered in sail and ground water during this investigation . <br /> suggest that contamination originated in the vicinity of the <br /> � ? former dispenser islands. No detectable soil or ground-water <br /> contamination was found in boring B-3/monitoring well MW-3, <br /> located downgradient .from the former underground tanks• <br /> s <br /> Because hydrocarbon-contaminated ground water-was found at the <br /> eastern upgradient margin of the site, it is possible that some <br /> contamination has migrated offsite. <br /> We recommend performing a soil vapor survey to identify areas <br /> - <br /> - y <br /> vapor <br /> containing elevated. levels of-hydrocarbons-in-soil.- -A A_-soil <br /> survey can provide useful information to select an efficient a.zd <br /> . 17 <br /> APPI146d C;4q0SysMe177s <br />