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V <br /> l l� 79449 Riverside Drive,Suite 230,Sonoma,California 95476 <br /> CONESTOGA-ROVERS Telephone: 707.935.4850 Facsimile: 707.935.6649 <br /> &ASSOCIATES www.CRAworld.com <br /> L t- �Qber 16, 2008 <br /> Ms.Margaret Lagorio �4 <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202t� �� i ���v1C'� <br />` Re: Response to Comments <br /> i' Independent Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> SAP Code 136143 <br /> Incident No. 98996183 <br /> Agency Case No. 1760 <br /> Dear Ms. Lagorio: <br /> Conestoga-Rovers & Associates (CRA) prepared this document on behalf of Equilon Enterprises LLC <br /> dba Shell Oil Products US (Shell) in response to comments made in the San Joaquin County <br /> Environmental Health Department's (SJCEHD) August 6, 2008 letter to Shell regarding our <br /> July 18, 2008 Site Investigation Work Plan for the referenced site (Figures 1 and 2). Our response is <br /> presented below. <br /> RESPONSE TO COMMENTS <br /> Additional information requested by SJCEHD staff is provided below. <br /> Well Construction Details <br /> Soil boring MW-8 will be drilled using dual cased air rotary-or rotosonic equipment or hollow-stem <br /> auger (HSA) equipment with 'conducto`r casing and will be converted to a deeper zone groundwater <br /> moni-toring well. Soil borings MW-9 and 'MW-10 will be drilled using HSA equipment and will be <br /> converted to shallow zone groundwater monitoring wells. The wells will be constructed using 4 inch <br /> diameter PVC casing. Boring and conductor casing diameters will be determined by the drilling <br /> company in accordance with regulatory and industry standards. It is anticipated that the auger diameter. <br /> for soil.borings MW-9 and MW-10 will be 10 inch. The drilling method for MW-8 will be determined <br /> based on the cosvestimate and recommendation obtained from.the selected drilling company. If HSA <br /> drilling equipment is used, the well will likely be-constructed using a 12 inch diameter conductor casing <br /> and 16 inch diameter augers will be used to drill the boring for the conductor casing. The boring will <br /> then be completed using 8 or 10 inch diameter augers. If air rotary or rotosonic drilling equipment is <br /> used,based on our experience, the drilling equipment diameter will be 10 inch. CRA will insure that the <br /> drillers use appropriate sized equipment in accordance with regulatory and industry standards. <br /> Equal <br /> Employment <br /> Opportunity Employer <br /> Worldwide_.Engineering,Environmental,Construction,and IT Services <br />