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CAMBRIA <br /> March 1, 2004 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Re: Groundwater Monitoring Report— Fourth Quarter 2003 <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No. 98996181 <br /> SJCEHD Site 506171 <br /> i <br /> Dear Mr. Infuma: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> requirements of 23 CCR 2652d. <br /> FOURTH QUARTER 2003 ACTIVITIES <br /> Quarterly Groundwater Monitoring: Blaine Tech Services, Inc. (Blaine) of San Jose, California <br /> gauged and sampled all site wells and prepared a summary table of field gauging data and <br /> petroleum hydrocarbon and methyl tertiary butyl ether concentrations. Cambria prepared a <br /> summary table of additional groundwater analytical data (Table 1), a site vicinity/sensitive <br /> receptor survey map (Figure 1), and groundwater contour/chemical concentration map for both <br /> shallow and deeper zones (Figures 2 and 3). Blaine's report, presenting the laboratory report, is <br /> included as Appendix A. <br /> Site Investigation: On December 15 through 19, 2003, Cambria installed two shallow-zone <br /> monitoring wells (S-5 and S-6)and one deep-zone monitoring well (5-2-85), as part of an on- <br /> going environmental investigation at the site- The installation of these wells will be documented <br /> in a future report, along with additional pending site investigation activities. In the mean time, <br /> these new wells have been incorporated into the quarterly groundwater sampling program in <br /> place for this site. <br /> Cambria <br /> Environmental <br /> Technology,Inc. <br /> Walkins Street <br /> P.O.Box 2$9 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />