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THRIFTY OIL CO. <br /> . April 22, 2004 0.45540 <br /> Mr Michael J Infurna Jr RWQCB #390187 <br /> Senior REHS Global ID #T0607700132 <br /> County of San Joaquin Confirmation #9014979124 <br /> Site Mitigation Unit IV,LOP <br /> 304 East Weber St , Fifth Floor <br /> Stockton, CA 95202 <br /> RE Former Thrifty Oil Co. Station #171 <br /> ARCO Products Company Station 49600 <br /> 1250 North Wilson Way APR 2 6 2004 <br /> Stockton, CA 95205 <br /> Ist Quarter 2004, Status Report r l 1LAL[H <br /> Ft..,,,,, /UBV10ES <br /> Dear Mr Infurna <br /> Presented herein is the First Quarter 2004, Status Report prepared for former Thnfty 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 first quarter <br /> of 2004 Thrifty has retained the services of Earth Management Company (EMC) to conduct <br /> 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 geneial, <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 bte in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon February 11, 2004, data is presented as Figure 1, <br /> and groundwater generally flows northeast under a gradient of approximately 0 0029 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, T13-1, TB-7, TB-8, and TB-10 on <br /> February 1 1, 2004 Groundwater samples were obtained by EMC and delivered in a chilled state <br /> following strict Cham-of-Custody procedures to a state certified laboratory Samples were <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 /> Q� <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670• (562) 921-3581 <br />