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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> z 600 East Main Street Donna Heran,REHS <br /> U: ����� PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 <br /> 11�5G1r- Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> cq• .•��P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> F 0 R <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> February 19, 2010 <br /> Mr. Denis L. Brown <br /> Shell Oil Products US <br /> HSE — Environmental Services <br /> 20945 South Wilmington Avenue <br /> Carson, California 90810-1039 <br /> Subject Interstate Shell <br /> 620 West Charter Way <br /> Stockton, California 95206 <br /> Dear Mr. Brown: <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site <br /> Investigation Work Plan, dated December 21, 2009, prepared and submitted by <br /> Conestoga-Rovers and Associates (CRA) for the above-referenced site on your behalf. In <br /> the work plan, CRA proposes to advance five cone penetration test (CPT) borings to total <br /> depth of approximately fifty feet below surface grade (bsg) to assess the horizontal extent <br /> of petroleum hydrocarbons in soil and groundwater in Zone B (identified as forty-five to <br /> fifty feet bsg). CRA believes that prior to submitting a Corrective Action Plan, the <br /> proposed site investigation is needed in the area of soil boring CPT-4 and monitoring well <br /> MW-16-50, where significant concentrations of contaminants of concern have been <br /> detected. <br /> CRA proposes to characterize subsurface lithology and identify potentially permeable <br /> subsurface soil units using CPT technology by advancing borings CPT-19 through CPT-23 <br /> at the locations illustrated on Figure 2 of the work plan. Based on the acquired <br /> information, CRA proposes to collect a minimum of three grab groundwater samples from <br /> a boring advanced adjacent to each CPT boring at depths "just below the top of the <br /> shallow groundwater table," and at two additional depths identified as potentially course- <br /> grained zones on the CPT log. CRA also proposes to collect soil samples at ten-foot <br /> intervals from ten to fifty feet bsg. Although criteria for selecting soil and groundwater <br /> samples for chemical analysis has not been provided, CRA proposes to select soil and <br /> groundwater to be analyzed for total petroleum hydrocarbon quantified as gasoline <br /> (TPH-g); benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl tertiary-butyl <br /> ether (MTBE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), "or" ethylene <br /> dibromide (EDB). <br /> The EHD approves the work plan as submitted; however, it is not necessary to analyze <br /> samples for EDB since this compound has not been detected in soil or groundwater at this <br />