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THRIFTY OIL C© . <br /> January 18, 2001 <br /> Mr Michael J Infurna Jr <br /> Senior REHS <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 /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> 4th Quarter 2000, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Fourth Quarter 2000, Status Report prepared for former Thrifty Oil Co <br /> (Thrifty) Station#171 at 1250 Wilson Way, Stockton,California(Figure 1) Presented in this report <br /> are the results of the site monitoring and remedial efforts conducted during the Fourth Quarter 2000 <br /> Thrifty has retained the services of Earth Management Company (EMC) to conduct quarterly <br /> monitoring and sampling activities at this site <br /> Groundwater Monitoring <br /> Depth to groundwater is measured in each monitoring well on a quarterly basis In general, <br /> groundwater occurs under water table conditions beneath the station at depths ranging from 40 15 <br /> feet below ground surface(bsg) in monitoring well TB-1 to 48 12 feet bgs in monitoring well MW-6 <br /> (Appendix A) A groundwater elevation contour map based upon November 15, 2000 data is <br /> presented as Figure 1,and data indicates the direction of groundwater flow is radially outward from <br /> groundwater mounds near monitoring wells TB-1, TB-7, and TB-8 The hydraulic gradient ranges <br /> from approximately 0 04 feet/foot to 0 15 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 15, 2000 Groundwater samples were obtained by EMC and delivered in a chilled state <br /> following strict Chain-of-Custody procedures to a state certified laboratory and analyzed total <br /> petroleum hydrocarbons as gasoline (TPH-g) by EPA method 8015 modified and for volatile <br /> aromatic compounds of benzene, toluene, ethylbenzene, and xylenes (BTEX), using EPA method <br /> 8260B Starting in the third quarter of 1997, as required by the Central Valley Regional Water <br /> J ualzty Control Board (CVRWQCB), samples were also analyzed for oxygenates by EPA Method <br /> 13539 E Foster Rd , Santa Fe Spnngs, CA 90670-0138•(562)923-9876 <br />