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C A M B R I A <br /> APR S R 2005 <br /> Aril 8,2005 r �' <br /> ENVIRONMENT HEALTH p <br /> Ms Vicki McCartney PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report- First Quarter 2005 <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon,California <br /> SAP Code 135816 <br /> Incident No 98995874 <br /> SJCEHD Site Code 506186 <br /> Dear Ms McCartney <br /> Cambria Environmental Technology, Inc (Cambria) is submitting this groundwater monitoring <br /> report on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) in accordance <br /> with the quarterly reporting requirements of 23 CCR 2652d <br /> FIRST QUARTER 2005 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled selected wells <br /> and prepared a summary table of field gauging and laboratory analytical data Cambria prepared <br /> an area well survey map (Figure 1) and a groundwater contour/chemical concentration map for <br /> the deep zone (Figure 2) and for the shallow zone (Figure 3) Blaine's report, presenting the first <br /> quarter 2005 laboratory report, supporting field notes, and the additional December 2004 and <br /> February 2005 monthly sampling results for well MW-6A are included as Appendix A <br /> GROUNDWATER REMEDIATION <br /> Interim Groundwater Remediation: Blaine began weekly purging of onsite monitoring well <br /> MW-1 on November 10, 1998 and onsite extraction well EW-1 on March 11, 1999 This practice <br /> continued until the groundwater extraction (GWE)system was started during March 2000 <br /> Groundwater Remediation System Operation. Cambria installed a GWE system at this site <br /> which began operation in March 2000 and was shut down in July 2001 Hydrocarbon and MTBE <br /> Cambria I . ,. ..�T�,- <br /> Emironmental (.0nl.ClllYAU0ilS IId YC DCCII WDSLdIIUdlly 1CULIL,CU 1.11 gIL)UIIlWdlC1 MilUddi U1C SCLC '111G uYrl. <br /> nology,inc system extracted groundwater from well EW-1 at approximately five gallons per minute An <br /> estimate of contaminant mass removed by the GWE system is summarized in the following table <br /> 270 Perkins Street <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />