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a <br /> THRIFTY OIL CO. <br /> January 9, 2004 0.42108 <br /> Mr Michael J Infurna Jr RWQCB #390187 <br /> Senior REHS Global ID #T0607700132 <br /> County of San Joaquin Confirmation#8622205555 <br /> Site Mitigation Unit IV/LOP <br /> 304 East Weber St , Fifth Floor <br /> Stockton, CA 95202 REk'9 YED <br /> RE Former Thrifty Oil Co. Station #171 JAN 14 2004 <br /> ARCO Products Company Station #9600 <br /> 1250 North Wilson Way ENVIRONMENT HEALTH <br /> Stockton, CA 95205 PERMIT/SERVICES <br /> 4th Quarter 2003, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Fourth Quarter 2003, Status Report prepared for former Thrifty Oil Co <br /> (Thrifty) Station#171 at 1250 Wilson Way, Stockton, California(Figure 1) This report <br /> presents the results of the site monitoring and remedial efforts conducted during the fourth <br /> quarter of 2003 Thrifty has retained the services of Earth Management Company(EMC) to <br /> conduct quarterly monitoring and sampling of the groundwater monitoring wells, and monthly <br /> • sampling/weekly operation and maintenance activities for the on-site soil vapor extraction (SVE) <br /> remediation system <br /> Groundwater Monitoring <br /> Depth to groundwater is measured in each monitoring well on a quarterly basis In general, <br /> groundwater occurs beneath the station at depths ranging from 49 87 feet below top of casing <br /> (btc) in monitoring well TB-10 to 51 80 feet btc in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon November 24, 2003, data is presented as Figure <br /> 1, and groundwater generally flows northeast under a variable gradient ranging from 0 004 to <br /> 0 0073 feet/foot <br /> Quarterly Groundwater Sampling <br /> As part of the groundwater-monitoring program, groundwater samples were obtained from <br /> monitoring wells MW-2, MW-3R, MW-4, MW-5, MW-6, TB-1, TB-7, TB-8, and TB-10 on <br /> November 24, 2003 Groundwater samples were obtained by EMC and delivered in a chilled <br /> state following stnct Cham-of-Custody procedures to a state certified laboratory Samples are <br /> analyzed for total petroleum hydrocarbons (TPHg) by EPA Method 8015M, and for benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX), and selected oxygenates (di-isopropyl ether(DIPE), <br /> Ethyl tert-Butyl Ether (ETBE), Methyl tert-Butyl Ether(MTBE), Tert-Amyl Methyl Ether <br /> (TAME), and Tert-Butanol (TBA)) using EPA Method 8260B Ethanol and methanol were also <br /> analyzed by ASTM Method D285 <br /> Qo <br /> 13116 Imprial Highway, Santa Fe Springs, CA 90670- (562) 921-3581 <br />