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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> pQ ?N Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,RENS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgmarn, REHS <br /> Mike Huggins, REHS,RDI <br /> c •.. `. .gip Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> DENIS BROWN Nov o 6 2007 <br /> SHELL OIL PRODUCTS <br /> 20945 S WILMINGTON <br /> CARSON CA 90810-1039 <br /> RE: Shell Service Station SITE CODE: 1473 <br /> 2375 Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Site <br /> Investigation Work Plan (Work Plan) dated September 28, 2007, submitted on your behalf by <br /> Conestoga-Rovers & Associates (CRA) and has the following comments. <br /> In the Work Plan CRA proposes the installation of four groundwater monitoring wells to <br /> define the lateral and vertical extent of the groundwater contaminant impact at this site. <br /> Three of the proposed wells are shallow wells located offsite in down-gradient directions; one <br /> deeper screened well is proposed onsite to confirm the results of grab groundwater samples <br /> collected from cone penetrometor test (CPT) boring SB-1. CRA is proposing to install this <br /> deep well through a conductor casing installed to 30 feet below surface grade (bsg). <br /> SJC/EHD does not approve the installation of the deep well onsite. Three grab groundwater <br /> samples collected at depths ranging between 55-82 feet bsg from boring SB-1 were reported <br /> non-detect for all constituents analyzed. <br /> SJC/EHD approves the proposed shallow groundwater wells for lateral definition of the <br /> plume, but recommends that three wells be placed on the north side of the 205 freeway, and <br /> that their locations be shifted east from the locations proposed in the Work Plan. The <br /> proposed location east of the site is approved. <br /> If you have any questions please call Lori Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel Henderso , Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, PG, CVRWQCB <br /> Mike Murphy, CRA <br />