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CAMBRIA <br /> July 15, 2000 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report — Second Quarter 2000 <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> SJCPHS Site 506171 <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 requirements issued by the Regional Water Quality Control Board, <br /> Central Valley Region and San Joaquin County Public Health Services (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the second quarter of 2000 is summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected groundwater samples from wells S-1 through S-4 on May 3, 2000 <br /> Samples were transported to Sequoia Analytical of Morgan Hill, California for <br /> chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour map (Figure 2) Groundwater <br /> flow direction is to the southeast and the northwest, outward from a hydraulic high <br /> Oakland CA located between wells S-3 and S-4 The approximate hydraulic gradient ranges from <br /> San Ramon CA 0 001 to 0 002 <br /> Sonoma, CA <br /> Portland OR Groundwater samples collected from wells S-1 and S-3 contained TPHg <br /> Cambria concentrations of 135,000 and 61 0 ppb, respectively Well S-1 contained a benzene <br /> Environmental concentration of 2,670 ppb None of the other wells contained benzene MTBE (by <br /> Technology,Inc EPA Method 8020) was not reported in any of the wells sampled A chemical <br /> *0 Perkins Street concentration map is presented on Figure 2 <br /> P o Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />