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C A M B R I A <br /> J July 31,t 2000 <br /> e � <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services N <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Second Quarter 2000 <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> SAP Code 136149 <br /> Incident No 98996189 <br /> SJCPHS Site Code 1223 <br /> Dear Ms Duncan <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 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 second quarter of 2000 are summarized below <br /> ® Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected groundwater samples from wells MW-1 through MW-7 and <br /> VEW-2 on May 15, 2000 Samples were transported to Sequoia Analytical of <br /> Morgan Hill, California for chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> (Figure 2) Groundwater appears to flow outward from a hydraulic ridge located <br /> 0 a k I a n d CA between wells MW-1 and MW-3 The approximate hydraulic gradient ranges from <br /> San Ramon CA 0 006 to 0 017 <br /> Sonoma CA <br /> Portland, OR <br /> • Wells MW-4 through MW-7, and VEW-2 contained TPHg concentrations ranging <br /> Cambria from 161 to 112,000 ppb Benzene was detected in wells MW-I, MW-3, MW-4 <br /> Environmental through MW-7, and VEW-2 at concentrations ranging from 0 534 to 4,130 ppb <br /> Technology,Inc MTBE (by EPA Method 8020) was reported in wells MW-4 and MW-7 at <br /> OeTkins Street concentrations of 660 and 220 ppb, respectively MTBE by EPA Method 8260A <br /> PO Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />