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CAMBRIA <br /> October 22, 1999 <br /> Mr Mike 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 - Third Quarter 1999 <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 136144 <br /> Incident No 98996184 <br /> i <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 third quarter of 1999 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 July 27, 1999 The <br /> samples were transported to Sequoia Analytical of San Carlos and Morgan Hill, California <br /> for chemical analysis <br /> Oakland CA . Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> Sonoma CA data and prepared a groundwater contour map (Figure 2) for the shallow wells (wells <br /> Portland OR <br /> S e a t t l e WA MW-2 through MW-I I and RW-1 A) The groundwater flow direction varies across the <br /> site at an approximate hydraulic gradient ranging from 0 003 to 0 013 <br /> Cambria <br /> Environmental <br /> Enviroment l • Groundwater samples collected from shallow wells MW-5, MW-8, and RW-lA contained <br /> Techn101kmsStreet <br /> TPHg concentrations ranging from 27,600 to 638,000 ppb and benzene concentrations <br /> ranging from 800 to 17,400 ppb Methanol was detected in wells MW-8 and RW-1A at <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />