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-0,I-J <br /> CA B R I A <br /> July 1, 2002 <br /> Mr. Sam Savig <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Re: Groundwater Monitoring Report - Second Quarter 2002 <br /> Shell-branded Service Station <br /> 341 East Main Street C:) <br /> Ripon, California N <br /> SAP Code 135816 <br /> Incident No. 98995874 <br /> SJCEHD Site Code: 506186 <br /> Dear Mr. Savig: N <br /> crN <br /> Effective March 1, 2002, Equiva Services LLC and Equilon Enterprises LLC are now doing <br /> business as (dba) Shell Oil Products US (Shell). On behalf of Shell, Cambria Environmental <br /> Technology, Inc. (Cambria) is submitting this groundwater monitoring report in accordance with <br /> the quarterly reporting requirements of 23 CCR 2652d. <br /> SECOND QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring: On April 15, 2002, Blaine Tech Services, Inc. (Blaine) of San Jose, <br /> California gauged and sampled all wells, and compiled the groundwater analytical data. Cambria <br /> prepared an area well survey map (Figure 1) and two groundwater elevation contour maps <br /> (Figures 2 and 3). Blaine's report, presenting the laboratory report and supporting field notes, is <br /> included as Appendix A. <br /> GROUNDWATER REMEDIATION <br /> Oakland, CA Interim Groundwater Remediation: Blaine began weekly purging of onsite monitoring well <br /> San Ramon, CA <br /> Sonoma, CA 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 /> Cambria <br /> Fnvirek!!m „+.i <br /> Technology, Inc. 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 /> ns <br /> P.O.Box 25 <br /> erk259 Street concentrations have been substantially reduced in wells at the site. The GWE system extracted <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />