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:s <br /> f <br /> Exxon Conpany USA <br /> r 2021225-2745.02 <br /> August 21, 1987 <br /> TABLE 3 <br /> WATER SAMPLE ANALYSIS RESULTS <br /> (in ppb) <br /> Sample Total Volatile <br /> ID Hydrocarbons Benzene Toluene Xylene_ <br /> MW1 2750 52.2 141 . 4 772.4 <br /> r <br /> r, <br /> MW2 14.9 4 . 1 1 . 1 2.1 <br /> NfW3 8381 3078 462 .6 979.3 <br /> MW4 13. 5 2.9 1 .7 1.2 <br /> MW5 4 .2 <L.c 0.5. < 0.5 < 0.5 <br /> s>. .. <br /> s DISCUSSION AND RECOMMENDATIONS <br /> The findings of this additional investigation indicate that i <br /> the _subsurface soils and groundwater beneath the former Exxon r' <br /> service station have been impacted to some degree by hydrocarbon � <br /> components . The higher dissolved hydrocarbon concentration in ` <br /> monitoring well 3 suggests that the leakage likely occurred in <br /> y, the vicinity of the underground storage tanks . The limited <br /> rlateral extent as exhibited by the lower dissolved hydrocarbon <br /> ` concentrationa in monitoring wells 1, 2, 4 and 5 suggests the j <br /> major portion of the plume is contained ,on site: <br /> At this . time all the underground tanks and lines which MA'i <br /> have contributed to the subsurface contamination have been <br /> removed. The dissolved concentrations of benzene in monitoring <br /> wells 1 , 2 ; 3 and 4 .are above the action level ( 0 . 7 ppb ) <br /> established .by the California Department of Health Services. <br /> The benzene level (< 0. 5 ppb) in monitoring well 5 is below the <br /> s t� <br /> State action level <br /> 14 <br /> �k <br />