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THRIFTY OIL CO. <br /> • July 20, 2004 0.48331 <br /> Mr Michael J infurna Jr RWQCB #390187 <br /> Senior REHS Global ID #T0607700132 <br /> County of San Joaquin Confirmation #992529833 <br /> Site Mitigation Unit TV/LOP <br /> 304 East Weber St , Fifth Floor <br /> Stockton, CA 95202 RECUVE <br /> RE Former Thrifty Oil Co. Station #171 <br /> ARCO Products Company Station #9600 0L1 2044 <br /> 1250 North Wilson Way ENV€R+iIENT HEALTH <br /> Stockton, CA 95205 PERMr[15ERVK:ES <br /> 2nd Quarter 2004, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Second Quarter 2004, Status Report prepared for former Thnfty Oil Co <br /> (Thrifty) Station 9171 at 1250 Wilson Way, Stockton, California (Figure 1) This report <br /> presents the results of the site monitoring and remedial efforts conducted during the second <br /> quarter of 2004 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 45 87 feet below top of casing <br /> (btc) in monitoring well TB-10 to 47 86 feet btc in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon May 12, 2004, data is presented as Figure 1, and <br /> groundwater generally flows northeast under a gradient of approximately 0 0037 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 May <br /> 12, 2004 Groundwater samples were obtained by EMC and delivered in a chilled state <br /> following strict Chain-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 /> i <br /> Q© <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 - (562) 921-3581 <br />