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DEC 2 0 2004 <br /> C A M B R I A <br /> s <br /> December 17, 2004 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> 7 <br /> Re: Site Investigation Work Plan � <br /> Shell-branded Service Station <br /> 3011 West Benjamin Holt Drive <br /> Stockton,California <br /> © SAP Code <br /> Incident No.. 9899 98996188 <br /> SJCPHS Site 1883 <br /> Dear Mr. Infuma: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this work plan on behalf of <br /> Equilon Enterprises LLC dba Shell Oil Products US (Shell) to further assess the extent of <br /> gasoline constituents in groundwater northwest of the site as requested in San Joaquin County <br /> Environmental Health Department (SJCEHD) letter dated September 7, 2004. In addition to the <br /> request for additional assessment, SJCEHD is requiring a change to the quarterly groundwater <br /> analytical program for the site. The proposed scope of work presented in this document will <br /> comply with SJCEHD and Regional Water Quality Control Board guidelines. <br /> SITE BACKGROUND <br /> Site Description: The site is located at the northwest corner of the intersection of West <br /> Benjamin Holt Drive and Interstate 5 in a commercial area of Stockton, California (Figures 1 <br /> and 2). The site is an inactive service station with a layout including a station building, and two <br /> dispenser islands. The underground fuel storage tanks (USTs) were removed from this site <br /> during November 2004. Cambria is currently preparing a report documenting these UST <br /> removal activities. <br /> Site History: Details of previous investigation activities performed at this site are documented in <br /> Cambria's August 16,2004 site investigation report. <br /> SAMPLING/ANALYTICAL PROGRAM <br /> Cambria <br /> Environmental <br /> Technology,Inc. SJCEHD specified changes to the existing sampling and analytical program for this site in order <br /> to verify Cambria's conclusion that methyl tertiary butyl ether (MTBE) is undergoing <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />