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r , <br /> � AMBRIA <br /> October 9, 2000 <br /> Mr Michael lnfurna <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 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 /> Quarte7iy Monitoring & Sampling Summary <br /> Groundwater monitoring and well sampling for the third quarter of 2000 are summarized <br /> below <br /> o 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-]A, the <br /> offstte CalTrans irrigation well, and five offsite domestic wells on July 28, 2000 The <br /> samples were transported to Sequoia Analytical of Morgan Hill, California for chemical <br /> analyses <br /> o Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> Oakland, CA <br /> San Ramon CA data and prepared a groundwater contour map (Figure 2) for the shallow wells (wells <br /> Sonoma CA MW-2 through MW-I 1 and RW-I A) Groundwater flow is variable across the site at an <br /> Portland OR approximate hydraulic gradient ranging from 0 001 to 0 004 <br /> [ambna <br /> Enviromnental ® Groundwater samples collected from shallow wells MW-5, MW-8, and RW-lA contained <br /> Technology,Inc TPHg concentrations ranging from 18,100 to 81,100 ppb and benzene ranging from 413 <br />*01 <br /> Perkins Street <br /> to 13,500 ppb TPHg and benzene were not detected in any of the other shallow <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />