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7� T <br /> CAMBRIA ' <br /> P111 12 <br /> 00 JL <br /> July 19, 2000 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Second Quarter 2000 <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 1 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 measuredg roundwater levels in <br /> wells MW I A through MW-2A and collected groundwater samples from wells M W-1 A <br /> through MW-3A and BF-1 on May 1, 2000 Samples were transported to Sequoia <br /> Analytical of Morgan Hill, California for chemical analyses <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 /> northeast at an approximate hydraulic gradient of 0 002 <br /> Oakland, CA <br /> San Ramon CA . TPHg was detected in wells MW-lA and BF-1 at concentrations of 2,740 and 1,850 ppb, <br /> Sonoma CA <br /> P o T t I a n d OR respectively Benzene was detected only in well BF-1 at a concentration of 240 ppb <br /> MTBE (by EPA Method 8020) was reported in wells MW-IA through MW-3A and BF-1 <br /> Cambria at concentrations ranging from 9 21 to 158,000 ppb MTBE was detected by EPA <br /> Environmental Method 8260B in wells MW-1 A, MW-2A, and BF-1 at concentrations of 26,300, 265, <br /> Technology,Inc <br /> and 106,000 ppb, respectively A chemical concentration map was prepared and is <br /> *eTkins StTeet presented in Figure 2 <br /> P 0 Sox 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />