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f <br /> C A M B R I A <br /> January 22, 2003 <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report- Fourth Quarter 2002 and <br /> Analytical Reduction Recommendation <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 136144 <br /> Incident No 98996184 <br /> Dear Mr Infurna <br /> Cambria Environmental Technology, Inc (Cambna) 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 2002 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled the wells and <br /> prepared a summary table of field gauging data and analytical data Cambria compiled the <br /> additional oxygenate analytical data (Table 1), prepared a site vicinity map (Figure 1), and a <br /> groundwater contour/cheinical concentration map (Figure 2) Blaine's report, presenting the <br /> laboratory report, is included as Appendix A <br /> REMEDIATION <br /> From March through June 1999, weekly groundwater extraction (GWE) was performed on well <br /> RW-IA From July 1999 to June 2000, GWE occurred bi-monthly Beginning June 2000 the <br /> GWE occurred weekly During each GWE event, approximately 5,000 gallons of water was <br /> Oakland CA purged by a vacuum truck and transported to the Martinez Refining Company for recycling On <br /> San Ramon, CA <br /> Sonoma CA August 22, 2000 a pump was installed in RW-lA, which pumped into a Baker tank A vacuum <br /> truck emptied the tank and recycled the water as described above During mid-March 2001, the <br /> Cambna Baker tank was removed and a vacuum truck was employed to extract groundwater directly from <br /> Environmental RW-lA on a bi-weekly basis Vacuum truck events were discontinued after the July 17, 2001 <br /> Technology,Inc <br /> event A permanent GWE and treatment system now removes groundwater, treats it, and <br /> Orkin$Street discharges it directly into the sewer system GWE system analytical data and GWE system mass <br /> P 0 Box 259 <br /> Sonoma GA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />