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CAMBRIA L } " <br /> July l5, 19 8 <br /> Mr Alex Perez <br /> Equilon Enterprises, LLC <br /> P O Box 8080 <br /> Martinez, California 94553 <br /> Re Quarterly Monitoring Report - Second Quarter 1998 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> WIC 4204-7524-0808 <br /> Dear Mr Perez <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 May 21, 1998 <br /> Samples were transported to Sequoia Analytical (Sequoia) in Redwood City, California <br /> 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 flow direction appears to flow southwest, at an approximate <br /> Oakland CA hydraulic gradient of 0 002 <br /> Sonoma CA <br /> Portland OR <br /> Seattle WA & Ground water samples collected from Wells MW-1 through MW-3 contained ND <br /> levels of TPPH and benzene MTBE was present only in Well MW-3, at a <br /> Cambria concentration of 51 ppb by EPA Method 8020 <br /> Environmental <br /> Technology, Inc <br /> i*Perkins Street <br /> 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel (707)935-4850 <br /> Fax(707)935-6649 <br />