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M B R I A ,`: ` � ,- <br /> ,f s� <br /> 12 1 <br /> AI } January 24, 2000 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services s <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202, <br /> Re: Quarterly Monitoring Report — Fourth Quarter 1999 <br /> Shell-branded Service Station <br /> 2494 Fremont Street . <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No. '98996181 <br /> Dear Mr. Infurna: <br /> This report describes the recently completed ' activities associated with -groundwater <br /> monitoring and sampling at the referenced site (Figures l and 2). This report was prepared to <br /> meet quarterly reporting requirements issued by the Regional Water Quality Control, Board, <br /> Central Valley Region and San Joaquin County Public Health Services (SJCPHS). <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the fourth quarter of 1999 .is summarized below: <br /> • Blaine Tech Services, -Inc. (Blaine), of San Jose, California measured groundwater <br /> levels and collected groundwater samples in wells S-1 through S-3 on <br /> November.22, 1999. Samples.were transported to Sequoia Analytical of Morgan Hill <br /> California, for chemical analyses. <br /> • Cambria Environmental Technology, Inc. (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour map (Figure 2). Groundwater <br /> flow direction is to the southeast at an approximate hydraulic gradient of 0.002. <br /> oak I and, CA Groundwater samples collected from wells S-2 and S-3 did not contain TPH.g, <br /> Sonoma, CA benzene, or MTBE. Groundwater samples collected from well S-1 contained TPHg at <br /> Portland, OR i <br /> 5 e a t t I e, w A' a concentration of 120,000 ppb, benzene. at a concentration of 2,700 ppb, and <br /> MTBE (by EPA Method 8020) at .a concentration of 2,300 ppb. MTBE was not <br /> Cambria. detected in well S-1 by the EPA Method ,8260A analysis, however the laboratory <br /> Environmental <br /> i <br /> Technology,Inc. detection limit was elevated (<200 ppb). Well S-1 did not contain detectable levels of <br /> fuel oxygenates. A chemical concentration map is presented on Figure 2. <br /> z Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(7o7)935-485o I <br /> Fax(707)935-6649 } <br /> f — � <br />