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THRIFTY OIL CO. <br /> i <br /> July 23, 2003 RWQCB #390187 <br /> Mr Michael J Infurna Jr Global ID #T0607700132 <br /> Senior REHS Confirmation #8227693915 <br /> County of San Joaquin <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 #9600 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> 2nd Quarter 2003, Status Report <br /> Dear Mr Inf tma <br /> Presented herein is the Second Quarter 2003, Status Report prepared for former Thnfly Oil Co <br /> (Thrifty) Station#171 at 1250 Wilson Way, Stockton, California(Figure 1) This report presents <br /> the results of the site monitoring and remedial efforts conducted during the second quarter of 2003 <br /> Thrifty has retained the services of Earth Management Company (EMC) to conduct quarterly <br /> monitoring and sampling of the groundwater monitoring wells, and monthly sampling/weekly <br /> operation and maintenance activities for the on-site soil vapor extraction(SVE) 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 44 03 feet below ground surface (bgs) <br /> in monitoring well MW-5 to 46 11 feet bgs in monitoring well MW-6 (Appendix A) A groundwater <br /> elevation contour map based upon May 14, 2003 data is presented as Figure 1, and it appears that <br /> groundwater flows northeast under a gradient of approximately 0 005 R/ft <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 following <br /> strict Chain-of-Custody procedures to a state certified laboratory Samples are analyzed for total <br /> petroleum hydrocarbons (TPH-g) by EPA method 8015M modified for gasoline, and for benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX), 1,2 dichloroethane, and selected oxygenates (di- <br /> isopropyl ether(DIPE), Ethyl tert-Butyl Ether(ETBE), Methyl tert-Butyl Ether(MTBE), Tert-Amyl <br /> Qo <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 • (562) 921-3581 <br />