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C A M B R f A l(CE <br /> �crai_i14 <br /> `u0 ! 03 <br /> September 30, 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 - Third Quarter 1998 <br /> Shell-branded.Service Station <br /> 2494 Fremont Street <br /> Stockton, California <br /> WIC 4204-7524-1806 <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 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 in Wells S-1 through S-3 and collected ground water samples in Wells S-2 and <br /> S-3 on August 13, 1998. Ground.water samples were collected from Well S-1 on <br /> August-19, 1998 after. the well had been developed. Samples were transported to <br /> Sequoia Analytical Redwood City, California for chemical analysis. <br /> .• Cambria Environmental Technology, -Inc. (Cambria) evaluated water-level . <br /> measurement data and prepared a ground water contour map using the August 13, <br /> 1998 water level data (Plate 2).' Ground water flow' Arection is to the southeast at an <br /> Oakland. CA <br /> Sonoma, CA approximate hydraulic gradient of 0.002. <br /> Portland, OR <br /> Seattle, WA . Ground water samples collected from Wells S-2 and S-3 were ND for TPPH, benzene <br /> Cambria and MTBE. Ground water samples collected from Well S-I contained TPPH and <br /> Environmental benzene concentrations of.200;000 ppb and 5,000 ppb respectively. MTBE was not <br /> Technology, Inc. detected in the ground water sample from S-1, however the detection limit was <br /> ;�Perkins Street elevated (<2500). A chemical concentration map is presented on Plate 2. <br /> �a 0. Box 259 <br /> Sonoma, CA 95476 <br /> Tel(707)935-4850 <br /> j Fax(707)935-6649 <br /> f <br />