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,CAMBIA <br /> M <br /> MAY 2 8 2004 May 25, 2004 <br /> Mr Mike Infurna ENVIRONMENT HLALTH <br /> San Joaquin County Environmental Health DepartmentpERMIT/SERVICES <br /> 304 East Weber Street,Third Floor <br /> Stockton,California 95202 <br /> Re Groundwater Monitoring Report — First Quarter 2004, <br /> Preliminary Findings of Offsite Research, <br /> Work Plan Approval Response Letter <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 /> Dear Mr Infurna <br /> Cambria Environmental Technology, Inc (Cambria) prepared this document on behalf of <br /> Equilon Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly <br /> reporting requirements of 23 CCR 2652d This document also includes preliminary findings of <br /> research conducted to determine if there are any nearby properties that may have environmental <br /> issues associated with them In addition, we have included a response to the San Joaquin County <br /> Environmental Health (SJCEHD) September 22, 2003 correspondence, which conditionally <br /> approves Cambria's August 29,2003 Revised Site Investigation Work Plan <br /> FIRST QUARTER 2004 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 and laboratory <br /> analytical data Cambria prepared a site vicinity/sensitive receptor survey map (Figure 1), and <br /> groundwater contour/chemical concentration map for both shallow and deeper zones (Figures 2 <br /> and 3) Blaine's report,presenting the laboratory report, is included as Appendix A <br /> Site Investigation Status- We have installed three new wells (MW-5, MW-6, and MW-2-85) <br /> and have incorporated these wells into the quarterly monitoring program in place for this site <br /> We initiated our interim remedial action mass removal event on March 29, 2004 and continued - <br /> cambria into the early part of April Groundwater was extracted from two onsite wells in the vicinity of <br /> Environmental the northern dispenser island The extracted water was temporarily contained in a Baker tank <br /> Technology,Inc <br /> and then transported to the Shell Martinez refinery for recycling The findings of these pumping <br /> Weykins Street activities will be documented under separate cover - <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />