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. � <br /> 19449 Riverside Drive, Suite 230, Sonoma, California 95476 <br /> CONESTOGA-ROVERS Telephone: 707.935.4850 Facsimile: 707.9356649 <br /> — - www.CRAworld .com <br /> & ASSOCIATES D - � i <br /> ZU <br /> April 1, 2009 Reference No. 240783 <br /> ENVItiOh? i'IEidf HEALTH <br /> PER Mill?/; LFIVICES <br /> Mr. Michael J. hlfuTna Jr. <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> Dear Mr. Infurna: <br /> Re: Former Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 136144 <br /> Incident No. 98996184 <br /> SJCEHD Site Code 1070 <br /> Conestoga-Rovers & Associates (CRA) prepared this letter on behalf of Equilon Enterprises LLC <br /> dba Shell Oil Products US (Shell) in response to the March 24, 2009 letter from San Joaquin <br /> County Environmental Health Department (EHD) regarding the subject site. <br /> CRA had originally submitted a drilling permit to install three pilot testing wells. Our intention <br /> in doing so was to collect the necessary soil samples for the bench scale test (BST) while drilling <br /> the well borings for these pilot testing wells. We felt this was a cost effective and expeditious <br /> approach for collecting the BST samples and installing the pilot testing wells while the drilling <br /> equipment was onsite. <br /> The EHD letter requires we do not install the pilot testing wells prior to getting the results of the <br /> BST. As such we are altering our drilling plan to include only one soil boring during the first <br /> phase of drilling. This soil boring will be used to collect the necessary samples for the BST. <br /> CRA plans to use Gregg Drilling for this work (the same drilling contractor listed on our <br /> pending permit application) . The location of the soil boring is shown on the attached site map. <br /> As requested in the EHD letter, we will submit the findings of our BST to EHD for review and <br /> approval before performing any of the other work referenced in our work plan, <br /> i' <br /> i <br /> f <br /> I <br /> t <br /> I <br /> Equal <br /> Employment <br /> Opportunity Employer <br /> Worldwide Engineering, Environmental, Construction, and IT Services <br />