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i <br /> . <br /> CAMBRIA <br /> June 17,2S2 ' <br /> Ms. Lori Duncan i <br /> San Joaquin County Environmental Health Department d <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 <br /> Re: Site Investigation Work Plan <br /> Shell-branded Service Station <br /> 7910-Lower Sacramento Road <br /> Stockton, California <br /> SAP Code 136139 <br /> Incident No. 98996180 <br /> SJCE14D Site Code 1660 <br /> Dear Ms.Duncan: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this work plan on behalf of Shell <br />+� Oil Products US to provide further assessment of perched water conditions near the northwestern <br /> I dispenser island at the site referenced above as requested in San Joaquin County Environmental <br /> Health Department's (SJCEHD's)May 20, 2002 letter. The proposed scope of work presented in <br /> this document will comply with SJCEHD and Regional Water Quality Control Board guidelines. <br /> Site Location and Description <br /> The site is an operating service station located on the northeastern corner of the intersection of <br /> Lower Sacramento Road and Hammer Lane in a commercial area of Stockton, California <br /> (Figure 1). The site layout consists of a service station building, three dispenser islands, three <br /> existing underground fuel storage tanks (USTs), and a former fuel UST complex(Figure 2). <br /> Previous Work <br /> 198811989 Tank Removal: During December 1988 and January 1989, two 5,000-gallon and two <br /> i 8,000-gallon steel fuel USTs and associated piping were removed from the site. Soil samples <br /> Oakland, CA collected from beneath the former tanks contained total petroleum hydrocarbons calculated as <br /> San Ramon, CA <br /> gasoline (TPHg) at concentrations up to 4,880 parts per million (ppm) and up to 3.0 ppm <br /> Sonoma, CA <br /> benzene. Soil samples collected from beneath dispenser islands contained up to 1,510 ppm <br /> Cambria TPHg and 1.56 ppm benzene, with the highest concentrations beneath the northwestern dispenser <br /> Environmental (sample T-3). Soil samples collected from beneath the product lines and the new UST <br /> Technology,Inc. <br /> excavation did not contain detectable concentrations of TPHg or benzene. Soil data for sample <br /> 270 Perkins Street T-3 are included in Table 1 and the sample location is shown on Figure 2. Complete results of <br /> i P.O.Box 259 <br /> I Sonoma,CA 95476 <br /> J Tel(707)935-4850 <br /> Fax(707)935-6649 <br />