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BOS/SOB 209-4PS-3694 p. 2 <br /> CAMBRIA <br /> Mr, Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Quarterly Monitoring Report - First Quarter 2000 <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> © SAP Code 1 <br /> Incident No.. 989 98996184 <br /> Dear Mr. Infurna: <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures 1 and 2). This report was prepared to <br /> meet quarterly reporting guidelines issued by the Regional Water Quality Control Board, <br /> Central Valley Region and San Joaquin County Public Health Services. <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and well sampling for the first quarter of 2000 are summarized <br /> below: <br /> • Blaine Tech Services, Inc. (Blaine) of San Jose, California measured groundwater levels <br /> and collected groundwater samples from wells MW-2 through MW-14, RW-IA, the <br /> offsite CalTrans irrigation well, and five offsite domestic wells on January 28, 2000. The <br /> samples were transported to Sequoia Analytical of Morgan Hill, California for chemical <br /> analyses. <br /> • Cambria Environmental Technology, Inc. (Cambria) evaluated water-level measurement <br /> Oakland, C A data and prepared a groundwater contour map (Figure 2) for the shallow wells (wells <br /> Sonoma, CA <br /> Dortland, 09 MW-2 through MW-II and RW-IA). Groundwater flows predominately to the <br /> Seattle, WA southwest at an approximate hydraulic gradient of 0.003. <br /> Cambria • Groundwater samples collected from shallow wells MW-5, MW-8, and RW-IA contained <br /> Environmetal <br /> Technology Inc, TPHg concentrations ranging from 6,500 to 97,800 ppb. Benzene was detected in wells <br /> 27o Perkins Street <br /> MW-2, MW-5, MW-8, and RW-]A at concentrations ranging from 5.26 to 17,300 ppb- <br /> P.O. <br /> pb.PO •xRECEIVED <br /> Sonoma.CAA 95476 <br /> Tel(707)935-4850 <br /> PoMAR 9 2000 <br /> Pox(707)935-6649 <br /> BOARD OF SUPERVISORS <br />