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Lann ersville school District <br /> 202/799-8221 <br /> July 28, 1987 <br /> TABLE 2 <br /> LABORATORY ANALYSIS FOR GROUNDWATER <br /> ( in ppb) <br /> June 22, 1987 <br /> Well Total Volatile <br /> ID Beazene Toluene Ethylbenzene XA cne H ydrocarbons <br /> MW1 664 .0 493.8 298. 8 1132 .0 4923.0 <br /> MW2 67 .8 407 . 1 535 . 1 2893. 0 6958 .0 <br /> MW3 4 . 5 4 . 8 2 . 5 20.7 200. 9 <br /> MW.4 1 . 3 4 .8 < 0. 5 5. 1 32.5 <br /> MW5 4 .9 3 .5 2. 7 4.2 33.3 <br /> DISCUSSION AND RECOMMENDATIONS <br /> Tlie findings of this investigation indicate that the <br /> subsurface groundwater beneath the Lammersville School site has <br /> been impacted by hydrocarbons . The higher dissolved hydrocarbon <br /> concentrations in wells 1 and 2 and the presence of petroleum <br /> odors by field inspection and analysis suggest that leakage has <br /> occurred in the vicinity of the pump island and/or tank pit . The <br /> limited lateral extent , as exhibited by lower dissolved <br /> the surrounding monitoring wells , <br /> hydrocarbon concentrations in <br /> suggests the major portion of the plume is contained on site. <br /> - The dissolved concentrations of benzene in the five wells is <br /> above the drinking water action level of 0.7 ppb established by <br /> the California Department of Health Services . Since all <br /> _ groundwater in the city of Tracy is considered suitable for <br /> drinking, additional assessment and remediation will likely be <br />