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' I <br /> r <br /> CAMBRIA <br /> January 31, 1999 <br /> Ms Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - Fourth Quarter 1998 <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC #204-7525-0104 <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 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 fourth quarter of 1998 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-7 and VEW-2 on <br /> November 23, 1998 Samples were transported to Sequoia Analytical in Redwood <br /> City, 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 is to the east The hydraulic gradient was <br /> calculated to be approximately 0 005 <br /> Oakland CA <br /> Sonoma CA • The concentration of TPPH in ground water samples from this site ranged from ND <br /> Portland OR <br /> s e a t t i e WA to 44,000 ppb Benzene concentrations ianged from ND to 12,000 ppb, and MTBE <br /> (by EPA Method 8020) concentrations ranged from ND to 54 ppb <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> Oerkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4B50 <br /> Fax(7o7)935-6649 <br />