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o � <br /> v <br /> San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> OPpUIN C Environmental Health Department ASSISTANT DIRECTOR <br /> '' — .0 600 East Main Street Laurie Cotulla, REHS <br /> r 2< Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Mike Huggins,REHS, RDI <br /> 0... c .a�P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> /FOR Phone: (209) 468-3420 Robert McClellan,REHS <br /> Fax: (209)464-0138 Jeff Carruesco, REHS, RDI <br /> September 25,2008 Kasey Foley,REHS <br /> Denis L Brown <br /> Shell Oil Products Us <br /> 20945 S Wilmington Ave <br /> Carson, Ca 90810 <br /> Subject: Shell Service Station,2320 N. El Dorado Street, Stockton,CA 95204 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Subsurface <br /> Investigation Work Plan and Agency Response (WP) dated December 3, 2007, submitted on your <br /> behalf by Contestoga-Rovers &Associates (CRA)and has the following comments. <br /> In the WP, CRA proposes to investigate the vertical and lateral extent of the plume of dissolved <br /> petroleum hydrocarbons by advancing three Cone Penetrometer Testing (CPT) soil borings (CPT-1 <br /> through CPT-3) to 80 feet below surface grade (bsg) and to collect groundwater samples at <br /> approximately 50, 65, and 80 feet bsg, and installation two monitoring wells, MW-7 and MW-8, <br /> with screen intervals to be approximately 5 feet above to 10 feet below first encounter groundwater. <br /> The EHD approves the advancement of the CPT borings and installation of the monitoring wells as <br /> indicated in the WP, but recommends that CPT-2 and CPT-3 be relocated to areas of known <br /> contamination. The EHD believes that CPT-2 should be advanced near MW-2 adjacent to tank pull <br /> soil sample SS-10 E @ 16 feet bsg, taken July 10, 1990, which contained 160 parts per million <br /> (ppm) total petroleum hydrocarbons quantified and gasoline (TPH-g) and CPT-3 should be <br /> advanced near the south east dispenser tank pull soil sample SS-8 taken July 10, 1990 which <br /> contained 1,200 TPH-g. The EHD recommends that the CPT borings not bottom in sand units, but <br /> penetrate into the underlying fine grained unit to ascertain the sand unit thickness. The grab water <br /> samples should be collected from permeable units identified on the CPT logs,particularly from the <br /> sand unit located approximately 65 to 75 bsg if present. Proposed monitoring wells MW-7 and <br /> MW-8 should be constructed similar to previous wells as much as possible to have comparable <br /> ground water data. <br /> Submit to the EHD a well permit application and $89.00 permit fee. Once the well permit has been <br /> approved,notify the EHD of the proposed schedule for the work. The EHD requires a minimum 48- <br /> hour notice prior to initiation of any field work on the site. The EHD directs that the proposed work <br /> be implemented by October 31, 2008. <br /> Please contactFrankGJardi at(209) 953-7868 if you have any questions. / <br /> Frank Girardi, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> C: James Barton,RWQCB, 11020 Sun Center Dr. #200,Rancho Cordova, CA 95670 <br /> Mike Murphy, CRA, 19449 Riverside Drive, Suite 230, Sonoma, CA 95476 <br />