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i <br /> CAM BRIA <br /> June 6, 2000 <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 - Second Quarter 2000 <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 136144 <br /> Incident No 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 second 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-lA, the <br /> offsite CalTrans irrigation well, and five offsite domestic wells on April 18, 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 CA data and prepared a groundwater contour map (Figure 2) for the shallow wells (wells <br /> San Ramon, CA <br /> Sonoma CA MW-2 through MW-1 l and RW-I A) Groundwater flows predominately to the south at <br /> Portland OR an approximate hydraulic gradient ranging from 0 01 to 0 07 <br /> Cambna . Groundwater samples collected from shallow wells MW-5, MW-8, and RW-IA contained <br /> Environmental <br /> nology,Inc TPHg concentrations ranging from 10,800 to 80,700 ppb Benzene was detected in wells <br /> MW-5, MW-8, and RW-lA at concentrations ranging from 256 to 14,400 ppb TPHg <br /> 270 Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br /> L <br />