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I <br /> SECOR 90,1 j Kilgore koad Sulte 100 <br /> INTERNATIONAL Rancho Comm,CA 95670 <br /> S E C O R INCORPORATED 916.661-0400 rn <br /> 916.661-0480 FAK <br /> October 18, 2005 <br /> !° v <br /> Mr. Mike infurna 9 ph <br /> San Joaquin County Environmental Health Division OIL d <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> RE: Work Plan for Additional Site Assessment <br /> 76 (Former BP)Service Station No.11192 <br /> 1403 West Country Club Boulevard <br /> Stockton, California <br /> SECOR Job No. 77CP.60192.02.0004 <br /> Dear Mr. Infurna: <br /> On behalf of ConocoPhillips, SECOR International Incorporated (SECOR) has prepared <br /> this work plan for the installation of three off-site shallow zone groundwater monitoring wells <br /> (MW-14, MW-15, and MW-16), two off-site intermediate zone groundwater monitoring wells <br /> (MW-17 and MW-18), and one on-site deep zone groundwater monitoring well (MW-19) at <br /> and in the vicinity of the site referenced above (Figure 1). The purpose of the work is to <br /> further define the vertical and lateral extent of dissolved fuel oxygenate impacts beneath <br /> and in the vicinity of the site. A brief discussion of site background, proposed scope of <br /> work,and schedule are presented below. <br /> SITE BACKGROUND <br /> The site is located at 1403 West Country Club Boulevard in Stockton, California, and is <br /> currently an operating 76 service station. The operating facility consists of a station <br /> building, a car wash, an auto service bay, an oil change building, four dispenser islands, a <br /> canopy, three double-walled, 10,000-gallon gasoline underground storage tanks (USTs), <br /> one 2,500-gallon waste oil UST(operated by others), and associated product lines. <br /> The site was operated as a gasoline service station by Mobil Oil Company(Mobil), following <br /> the installation of two 10,000-gallon unleaded gasoline USTs, one 10-000-gallon leaded <br /> gasoline UST, three 3,000-gallon motor oil USTs, and one 3,000-gallon used oil UST, <br /> associated piping and dispensers, and other facility structures in 1976. The site was <br /> purchased by BP Oil (BP) in May 1989. The site was operated under BP ownership until <br /> Tosco Corporation(now ConocoPhillips)assumed operations In 1994. <br /> Properties in the site vicinity are primarily residential and commercial developments. A <br /> former Shell Service Station was located across Pershing Avenue, east of the site (1267 <br /> Country Club Boulevard). <br />