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The results of this additional subsurface investigation found evidence of benzene and 1, 2- <br /> dichloropropane exceeding MCLs for drinking water in groundwater beneath the septic system <br /> area. <br /> The impact found to the groundwater by benzene and 1,2-DCP was not delineated to the west <br /> or south of the septic system. The concentrations of benzene decrease substantially to the <br /> northwest. The concentrations of 1,2-DCP do not appear follow this pattern; rather, the <br /> concentration is highest in the farthest north portion of the investigated septic system area. <br /> Due to discovery of a release on the subject property, the results of this assessment are <br /> required to be provided to the San Joaquin County Department of Environmental Health <br /> (SJVDEH) and the Regional Water Quality Control Board (RWQCB) for their evaluation and <br /> regulatory review. <br /> Addendum to Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. <br /> 248 Industrial Avenue,Stockton,CA 95206 Page 11 <br />