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CAMBRIA <br /> 12 1: 9 <br /> October 31, 1998 <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 - Third 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 third 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 July <br /> 29, 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 ranges from easterly to northerly <br /> The hydraulic gradient was calculated to range from 0 002 to 0 003 <br /> Oakland CA <br /> Sonoma O <br /> Portland OR The concentration of TPPH in ground water samples from this site ranged from ND <br /> Seattle WA to 23,000 ppb Benzene concentrations ranged from ND to 8,800 ppb, and MTBE <br /> concentrations ranged from ND to 1,200 ppb <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> 0o Perkins Sired <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />