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I <br /> � <br /> r <br /> )! , } <br /> CAM 'BRIA <br /> D <br /> NOV <br /> 8 1999 <br /> ENVIRONMENTAL HEALTH <br /> November 2, 1999 <br /> Mr Harlin Knoll PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Third Quarter 1999 and <br /> Sensitive Receptor Survey <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures I and 2) This report was prepared to <br /> meet reporting requirements issued by the Regional Water Quality Control Board, Central <br /> Valley Region and San Joaquin County Public Health Services, Environmental Health <br /> Division <br /> Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater levels <br /> and collected groundwater samples from wells MW-IA, MW-2A, and MW-3A on <br /> August 30, 1999 Samples were transported to Sequoia Analytical of Morgan Hill, <br /> California for chemical analyses <br /> O <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a groundwater contour map (Figure 2) Groundwater flow is to the <br /> Oakland CA northeast at an approximate hydraulic gradient of 0 0006 to 0 0008 <br /> Sonoma CA <br /> Portland OR • TPPH was detected in well MW-I A at a concentration of 67 4 ppb MTBE was detected <br /> Seattle WA <br /> in wells MW-lA and MW-2A at concentrations of 14,300ppb and 125 ppb, respectively <br /> Cambria Benzene was detected in well MW-2A at a concentration of 0 927 ppb Methanol was <br /> Environmental not detected in any wells A chemical concentration map was prepared and is presented in <br /> Technology,Inc <br /> Figure 2 <br /> &rkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4850 <br /> Fax(707)935-6649 <br />