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CAMBRIA <br /> 57 April 19, 2000 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - First Quarter 2000 <br /> Shell-branded Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> SAP Code 136142 <br /> Incident No 98996182 <br /> SJCPHS Site Cade 1785 <br /> Dear Mr Knoll <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 <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter is summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels in wells MW-1 through MW-4, VEW-1, and VEW-2 and collected samples <br /> from wells MW-I through MW-4, and VEW-1 on February 10, 2000 Well VEW-2 <br /> had insufficient water for sampling Samples were transported to Sequoia Analytical <br /> (Sequoia) of San Carlos, California for chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> Oakland, CA (Figure 2) Groundwater flows to the northeast at an approximate hydraulic gradient <br /> San Ramon CA of 0 004 <br /> Sonoma CA <br /> Portland OR <br /> • No TPHg, benzene, or MTBE were detected in any of the wells sampled this quarter <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> 0)Perklns Street <br /> P 0 Bax 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />