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4 [ <br /> MD <br /> CAMBRBA <br /> SEP 19 2002 <br /> ENVIRONMENT HEALTH September 16,2002 <br /> PERMIT/SERVICES <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,3rd Floor 4 f <br /> Stockton, California 95202 <br /> Re: Groundwater Monitoring Report - Third Quarter 20021 <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. Lagorio: <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 /> iwith the quarterly reporting requirements of 23 CCR 2652d. <br /> THIRD QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring: Blaine Tech Services, Inc. (Blaine) of San Jose, California gauged <br /> and sampled all wells, and prepared a summary table of field gauging data and laboratory <br /> analytical data. Cambria prepared an area well survey map (Figure 1) and two groundwater <br /> elevation contour maps (Figures 2 and 3). Blaine's report, presenting the laboratory report and <br /> supporting field notes, is 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 /> Oakland, CA continued until the groundwater extraction (GWE) system was started during March 2000. <br /> San Ramon, CA <br /> Sonoma, CA <br /> Groundwater Remediation System Operation: Cambria installed a GWE system at this site <br /> Cambria which began operation in March 2000 and was shut down in July 2001. Hydrocarbon and methyl <br /> Environmental <br /> Technology,Inc. tertiary butyl ether (MTBE) concentrations have been substantially reduced in wells at the site. <br /> Orkins Street The GWE system extracted groundwater from well EW-1 at approximately five gallons per <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />