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+ n <br /> Ms Lori Duncan <br /> • Page 5 of 5 <br /> The dichlorinated ethanes and ethenes detected in the groundwater sample may be degradation <br /> products of TCA and PCE although 1,1-DCA has also been used as a gasoline additive. 1,1-DCA <br /> and cis-1,2-DCE were present at concentrations above their respective MCLS, but only by factors <br /> of two or three. <br /> The 46 ppb of MTBE detected in the groundwater sample exceeds the primary MCL of 13 ppb. <br /> RECOMMENDATIONS <br /> We recommend conducting a government database search and an agency file review of adjacent <br /> and nearby properties which may have had unauthorized releases of hazardous materials. <br /> Please contact Ground Zero at your convenience if you have any questions or comments regarding this <br /> report. <br /> Respectfully, <br /> Ground Zero ysis Inc. <br /> �IEpaP0 . <br /> can ey, ,�� 0 <br /> Staff ologist ��' <br /> STAII <br /> to `� <br /> No. 5023 <br /> Gregory P. Stahl, G 5023 <br /> CA Certified Hydrogeologist No. 264 `rlgjF OF CALkk���@ <br /> Attachments <br /> M. Mr. Ed Niemann, North Stockton Auto Service <br /> Mr. Marty Hartzell, RWQCB <br /> osauto/reports/addsubsurEsum.doc <br />