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RIM <br /> TABLE 3 <br /> WATER SAMPLE ANALYSIS RESULTS <br /> Sample ID Total Petroleum Benzene Toluene <br /> X le <br /> Hydrocarbons (ppm) (ppm) Y ne <br /> (ppm) (Ppm) <br /> � 1 .290 0.0058 0.0005 0.0013 <br /> MW2 .290 0.029 . 0.0005 0.00022 <br /> MW3 14.000 <br /> 7.50 2.300 <br /> I. <br /> DISCUSSION AND RECOMMENDATIONS <br /> FM <br /> The findings of this additional investigations indicate dic <br /> ate that <br /> the subsurface ' <br /> soils and <br /> groundwater beneath the former Exxon <br /> service station have been impacted by hydrocarbons. The higher <br /> dissolved hydrocarbon on concentration in monitoring well three and <br /> the presence of petroleum odor by field inspection and analysis <br /> of soils from this <br /> boring suggest that the leakage likely <br /> occurred in the vicinity of the underground storage tanks <br /> ` Limited lateral spreading .as exhibited b the The <br /> Y e Lower dissolved <br /> hydrocarbon concentrations in monitorir_g 'wells one and two <br /> Suggests the major portion of the plume is contained on site. <br /> At this time all the underground tanks and l' <br /> ;� znes which may. <br /> have contributed to the . subsurface. contamination have been i <br /> removed. The dissolved concentrations of benzene in all three { <br /> { <br /> wells .is above the action level <br /> (0. 7 'ppb, established by the <br /> California Department of Health Services. . Since all <br /> drinking <br /> r water in thecity of Stockton is considered .aui <br /> le. for <br /> drinking additonal .assessment and remediation bwill likely be <br /> n <br /> required by the regulatory a encies . <br /> g As such Groundwater <br /> g <br /> Technology recommends the following: <br /> �. - <br /> Install two additonal monitoring wells to the. northwest ' <br /> r : <br /> and southwest of the tank Pit area to aid .in defining ; <br /> the areal extent of impacted. groundwater. <br /> Lf <br /> 10 <br /> MEN :N11 <br /> Y; <br />