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RECE MED <br /> C A M B R I A AUG 2 9 2003 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> August 28,2003 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street,Third Floor <br /> Stockton,California 95202 <br /> Re: Revised Site Investigation Work Plan <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton,California <br /> SAP Code 136141 <br /> © Incident 181 <br /> Site <br /> 5061 <br /> SJCPHS Site 506171 <br /> Dear Mr. Infurna: <br /> Cambria Environmental Technology, Inc. (Cambria)prepared this revised work plan on behalf of <br /> Equilon Enterprises, LLC dba Shell Oil Products US (Shell). San Joaquin County <br /> Environmental Health Department (EHD) directed Shell, in their July 18, 2003 letter, to prepare <br /> a revised work plan to delineate the vertical and lateral extent of methanol and 1,2- <br /> dichloroethane (1,2-DCA)beneath the site. The original due date for this work plan was August <br /> 19, 2003, but EHD extended the due date to August 29, 2003. The work plan presented below is <br /> written to comply with EHD and Regional Water Quality Control Board(RWQCB)guidelines. <br /> As discussed during the July 28, 2003 meeting with EHD, Shell, RWQCB, and Cambria, EHD's <br /> original request to investigate the extent of methanol was based on a one-time detection (in two <br /> wells) of methanol. EHD agreed that further assessment for methanol is not warranted at this <br /> time based on the one-time detection. Shell has altered the groundwater sampling program at the <br /> site to include methanol analysis for groundwater samples from all monitoring wells on a <br /> quarterly basis. <br /> SITE DESCRIPTION AND BACKGROUND <br /> Oakland, C A The subject property is located on the southwest comer of the intersection of East Fremont Street <br /> San Ramon, CA and Filbert Street in Stockton, California (Figure 1). The site is an operating Shell-branded <br /> Sonoma. CA service station with two underground gasoline storage tanks, one underground waste oil tank, <br /> Cambria four dispenser islands, and a station building(Figure 2). A complete site background for this site <br /> Environmental is contained in the site investigation report issued March 6, 2003. <br /> Technology, Inc. <br /> 210 Perkins Street <br /> P.O.Boz 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />