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- _ 2 <br /> 19449 Riverside Drive, Suite 80, Sn <br /> ooma, California 95476 <br /> Telephone::707.935.4850 Facsimile: 707935.6649 <br /> CONESTOGA-ROVERS _ wwvv.GR 4world.com ` <br /> &ASSOCIATES - <br /> ., June-12,2007 <br /> Ms.Lori Duncan C) <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re: Site Assessment Report <br /> Shell-branded Service Station PFS I, ' <br /> - - 2375 West Grant Line Road ' _ �` - <br /> ti Yf' `a 1.�f�, <br /> Tracy, California' <br /> SAP Code 136187 <br /> Incident No. 97471967 <br /> x SJCEHD Site Code: 0001473 <br /> Dear Ms, Duncan: <br /> Conestoga-Rovers &Associates(CRA),­formerly Cambria Environmental Technology Inc.,prepared this <br /> report at the request of Equilon Enterprises,LLC- dba-She Oil Products US (Shell) to present an- <br /> ` assessment of current site conditions'and an-evaluation of the current remedial approach. <br /> EXECUTIVE SUMMARY <br /> • Current MTBE concentrations and the MTBE mass remaining in groundwater.are.low. Based on <br /> 4. <br /> - site lithology,hydrogeology, and hwstorical groundwater monitoring data,the MTBE plume has not <br /> - and will not migrate significantly. - q <br /> • Known receptors are not threatened by MTBE at this site. Amass flux.evaluation demonstrated, <br /> that potential receptors(supply wells) are not threatened by MTBE at this site. <br /> • Current remedial activities are neither efficient nor cost-effective. Implementation of monitored. <br /> natural attenuation is appropriate - r <br /> Equal. <br /> Employment-" <br /> . - -- - OpportuniryEmployer— .. <br /> Worldwide Engineering, Environmental,Construction,and IT Services <br />