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CAMBRIA - sir <br /> July 31, 1998 <br /> Ms Karen Petryna <br /> Equilon Enterprises, LLC <br /> Equiva Services, LLC <br /> 108 Cutting Boulevard <br /> Richmond, California 94804 <br /> Re Quarterly Monitoring Report - Second Quarter 1998 <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC #204-7525-0104 <br /> (9 1 <br /> Dear Ms Petryna <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 quarterly reporting requirements issued by the Regional Water Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services <br /> (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the second quarter of 1998 are surnmarized 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-7 and VEW-2 on May <br /> 20, 1998 Samples were transported to Sequoia Analytical 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 flow direction at the site is westerly to southeasterly The <br /> Oakland CA hydraulic gradient varied across the site ranging. from 0 0005 to 0 013 <br /> Sonoma CA <br /> Portland OR <br /> Seatife WA The concentration of TPPH in ground water samples from this site ranged from ND <br /> to 120,000 ppb Benzene concentrations ranged from ND to 17,000 ppb, and MTBE <br /> Cambria <br /> Environmental concentrations ranged from ND to 730 ppb <br /> Technology, Inc <br /> 0,Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> T0007)935-4850 <br /> Fax(707)935-6649 <br />