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CAM B R 1 A , 1iS ti£ •TI 1lt-��I <br /> JG 0 PH 123 <br /> August 15, 1998 <br /> .' 'Mr. Mike Infurna <br /> San Joaquin County Public Health Services. <br /> P.O. Box 388 <br /> Stockton, California 95201 <br /> Re: Quarterly Monitoring 'Report -Second Quarter 1998 <br /> Former Shell Service Station, <br /> 1267 Country Club Boulevard ' <br /> Stockton; California <br /> WIC #204-7524-0204 <br /> Dear Mr. Infurna: <br /> This Quarterly .Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates i 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 /> l <br /> levels and collected samples from Wells S-1 through S-6 on May 6, 1998. Samples <br /> were transported to Sequoia Analytical (Sequoia) in Redwood City, California for <br /> 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 flows north to northeast at an approximate <br /> hydrauiic.gradient of 0.002.. <br /> Oakland, CA • Ground water samples-collected from Wells. S-,1 through S-6 contained TPPH at <br /> Sonoma, CA <br /> Portland, OR concentrations ranging from ND to.29,000 ppb, TEPH 'concentrations ranging from <br /> Seattle, WA N.D to 7,400 ppb, and benzene concentrations ranging from ND to 240 ppb. MTBE <br /> was not detected in ground water samples this quarter. <br /> Cambria <br /> Environmental <br /> .Technology, Inc. <br /> 7o Perkins Street <br /> k <br /> P.O. Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />