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CAMBRIA <br /> January 22, 2004 <br /> Ms Victoria McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 JAN 2 2004 <br /> Re Groundwater Monitoring Report ort - Fourth Quarter 2003 ENVIRONMENT HEALTH Shell-branded Service Station PERMIT/SERVICES <br /> 620 West Charter Way <br /> Stockton, California <br /> SAP Code 136147 <br /> Incident No 98996187 <br /> SJCEHD Site Code 1058124 <br /> Dear Ms McCartney <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 /> Groundwater Mondoring Blame Tech Services, Inc (Blaine) of San Jose, California gauged <br /> and sampled all site wells and prepared a summary table of field gauging data and petroleum <br /> hydrocarbon and methyl tertiary butyl ether (MTBE) concentrations Cambria prepared a table <br /> of oxygenate data (Table 1), a site vicinity/well survey map (Figure 1), and a groundwater <br /> contour/chemical concentration map(Figure 2) Blaine's report, presenting the laboratory report, <br /> is included as Appendix A <br /> As requested by San Joaquin County Environmental Health Department in a November 6, 2003 <br /> telephone conversation, groundwater samples were analyzed for fuel oxygenates (MTBE, tertiary <br /> butyl alcohol, di-isopropyl ether, ethyl tertiary butyl ether, and tertiary amyl methyl ether) and <br /> lead scavengers (1,2-dichloroethane and ethylene dibromide) These analyses will continue <br /> quarterly <br /> Oakland CA <br /> San Ramon CA <br /> Sonoma CA Groundwater Remediation Periodic groundwater extraction (GWE) from monitoring wells <br /> MW-8 and MW-9 was implemented on November 24, 2003 as an interim remedial measure <br /> cambna Dedicated flexible hose stingers were used to extract groundwater The vacuum truck was <br /> Environmental <br /> Technology,Inc provided by Onyx Industrial Services of Benicia, California Extracted groundwater was <br /> transported to Shell's Martinez Refinery for recycling <br /> WrIcins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />