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t T <br /> C A M B R I A <br /> i 1 <br /> 2', <br /> April 27, 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 — First Quarter 2000 <br /> Shell-branded Service Station <br /> 2494 East Fremont Street 66 <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 /> • <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the first quarter of 2000 is summarized below <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels in and collected groundwater samples from wells S-1 through S-3 on <br /> February 1, 2000 Groundwater levels were also measured in wells S-1 through S-4 and <br /> groundwater samples were collected from well S-4 on February 18, 2000 Samples <br /> were transported to Sequoia Analytical of Morgan Hill and Petaluma, California for <br /> chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> Oakland CA measurement data and prepared a groundwater contour map (Figure 2) Groundwater <br /> San Ramon CA flow direction is to the southeast and the northwest, towards a hydraulic low located <br /> Sonoma CA <br /> P o r i l a n d o R between wells S-3 and S-4 The approximate hydraulic gradient ranges from 0 0002 <br /> to 0 0008 <br /> Cambria <br /> Environmental <br /> Technology,Inc 0Groundwater samples collected from wells S-2, S-3, and S-4 did not contain TPHg, <br /> 400lBox259 street benzene, or MTBE Groundwater samples collected from well S-I contained TPHg at <br /> P 0 Box 25 <br /> a concentration of 62,000 ppb and benzene at a concentration of 3,000 ppb MTBE <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)93S-6649 <br />