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a <br /> C A M B R I A <br /> E i <br /> January 15, 1999 <br /> Margaret Lagorio <br /> San Joaquin County Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report — Fourth Quarter 1998 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> WIC 4204-7524-0808 <br /> Dear Ms Lagorio <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates 1 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 /> Ground water monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water <br /> levels and collected samples from Wells MW-1 through MW-3 on November 10, <br /> 1998 Samples were transported to Sequoia Analytical (Sequoia) in Redwood City, <br /> California for chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour/chemical concentration map <br /> (Plate 2) Ground water appears to flow easterly at an approximate hydraulic <br /> gradient of 0 004 <br /> Oakland CA Ground water samples collected from Wells MW-1 through MW-3 contained non- <br /> Sonoma CA <br /> Portland OR detectable (ND) levels of TPPH and benzene except for MW-2 which contained <br /> Seattle WA benzene at a concentration of 0 67 ppb MTBE was present in Well MW-1 at a <br /> concentration of 36 ppb <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> z7o Perkins Street <br /> 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />