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THRIFTY OIL CO. <br /> October 22, 2003 RWQCB #390187 <br /> Global ID #T0607700132 <br /> Mr Michael J Infurna Jr Confirmation #5483966827 <br /> Senior REHS <br /> County of San Joaquin <br /> Site Mitigation Unit TV/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 #9600 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> 3rd Quarter 2003, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Third 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 third quarter <br />• of 2003 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 general, <br /> groundwater occurs beneath the station at depths ranging from 48 04 feet below ground surface <br /> (bgs) in monitoring well TB-10 to 50 12 feet bgs in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon August 12, 2003 data, is presented as Figure 1, <br /> and it appears that groundwater flows northeast under a variable gradient ranging from 0 0073 to <br /> 0 015 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 /> 14, 2003 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 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(131PE), <br /> Q© <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 - (562) 921-3581 <br />