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CAMBRIA <br /> t <br /> October 15, 1998 <br /> Ms Mary Meays <br /> San Joaquin County Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Third Quarter 9998 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> WIC 1204-7524-0808 <br /> Dear Ms Meays <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates I and 2) This report <br /> was prepared to meet reporting requirements issued by the Regional Water Quality Control <br /> Board, Central Valley Region and the San Joaquin County Environmental Health Division <br /> Quarterly Monitoring & Sampling Summary <br /> I <br /> Ground water monitoring and sampling for this quarter are summarized below <br /> i <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water <br /> I <br /> levels and collected samples from Wells MW-1 through MW-3 on July 28, 1998 <br /> Samples were transported to Sequoia Analytical (Sequoia) in Redwood City, California <br /> for chemical analysis <br /> i <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour/chemical concentration map <br /> I <br /> (Plate 2) Ground water appears to flow north, at an approximate hydraulic gradient <br /> of 0 003 <br /> Oakland CA Ground water samples collected from Wells MW-1 through MW-3 contained ND <br /> Sonoma CA <br /> Portland OR levels of TPPH and benzene except for MW-1 which contained benzene in a <br /> Seattle WA concentration of 0 72 ppb MTBE was present in Wells MW-1, MW-2, and MW-3 <br /> Cambria at concentrations of 2 9, 2 5, and 49 ppb, respectively <br /> Environmental <br /> Technology, Inc <br /> Perkins Street <br /> C Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4850 <br /> Fax(707)935-6649 <br />