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p N <br /> CAMBRIA <br /> April 30, 1999 <br /> Ms Margaret Lagorlo <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - First Quarter 1999 <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> Incident #98996189 <br /> SAP 4136149 <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 first quarter of 1999 are summarized below <br /> G 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 /> February 24, 1999 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 flows In a predominantly eastern direction The hydraulic <br /> Oakland CA <br /> Son �a C A gradient was calculated to be approximately 0 002 <br /> Portland OR <br /> I <br /> 5 e a t t I e WA , The concentration of TPPH in ground water samples from this site ranged from ND <br /> to 75,000 ppb Benzene concentrations ranged from ND to 12,000 ppb, and MTBE <br /> Cambria <br /> Environmental (by EPA Method 8020) concentrations ranged from ND to 1,400 ppb <br /> Technology,Inc <br /> Orkms Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Te!(707)935-4850 <br /> Fax(7a7)935-6649 <br />