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i <br /> _ CAMBRIA NOV 182002 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> November 14,2002 <br /> Mr. Harlin'Knoll r <br /> San Joaquin County Environmental Health Department <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Re: Groundwater Monitoring Report—Third Quarter 2002 and <br /> Water Well Viedo Logging Report <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> { Tracy, California <br /> SAP Code 136186 <br /> Incident No. 98996222 <br /> t <br /> Dear Mr. Knoll: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this report on behalf of Equilon <br /> j <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> ' requirements of 23 CCR 2652d. <br /> THIRD QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring: Blaine Tech Services, Inc. (Blaine) of San Jose, California gauged <br /> 'f and sampled all site wells and prepared a summary table of field gauging data and laboratory <br /> analytical results. These activities were coordinated with the Chevron service station located at <br /> 37755 Tracy Boulevard. Cambria prepaved a site vicinity/well survey map (Figure 1), and a <br /> .groundwater contour/chenucal concentration map (Figure 2). Cambria also prepared a graph <br /> ' (Figure 3) which is a plot of MTBE concentration in monitoring well MW-IA versus time. <br /> a <br /> Cumulative mass removed is, also shown on the graph. Blaine's report, which includes the. <br /> laboratory report, is included as Appendix A. Available well gauging data for the Chevron <br /> d station is included in Appendix B. <br /> Groundwater Remediation: Monthly groundwater extraction (GWE) using a vacuum truck <br /> Oakland, CA began February 7, 2000. During June 2001 the frequency of GWE was increased to twice 'a <br /> San Ramon, CA <br /> s o n o m a, CA month. During September 2002, the frequency was reduced to monthly. Between June 24, 2002 <br /> .and September 16, 2002, a total of 14,640 gallons of groundwater was removed from well MW- <br /> Camhria IA. A summary of the volume of groundwater extracted at the site and an estimate of the amount <br /> ' Environmental <br /> Technology,Inc. of total purgeable hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether <br /> { j[ (MTBE)removed is presented in Table 1. <br /> IY�Verkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />