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�> <br /> C A M B R I A r <br /> A P R 012000 <br /> ENVIROi,�Ilji� SNIIAL <br /> -���P�LTH <br /> PERNOT / SERVICES April 30, 2000 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - First 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 1 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 first quarter of 2000 are summarized below <br /> + Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels in and collected groundwater samples from wells MW-1 through MW-7 and <br /> VEW-2 on February 3, 2000 Samples were transported to Sequoia Analytical of San <br /> Carlos, 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 flow direction is primarily to the east at an approximate <br /> Oakland CA hydraulic gradient of 0 004 <br /> San Ramon, CA <br /> Sonoma CA + Wells MW-1, MW-2, and MW-5 did not contain detectable levels of TPHg, benzene, <br /> Portland OR <br /> and MTBE Wells MW-4, MW-6, MW-7, and VEW-2 contained TPHg. <br /> Cambria concentrations ranging from 6,240 to 88,900 ppb Benzene was detected in wells <br /> Environmental MW-3, MW-4, MW-6, MW-7, and VEW-2 at concentrations ranging from 2 19 to <br /> Technology, Inc 6,070 ppb MTBE (by EPA Method 8020) was reported in well MW-7 at a <br /> OeTkins Street <br /> PO Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />