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r ♦ . J <br /> THRIFTY C31L.. CQ . <br /> April 16, 2002 RWQCB #390187 <br /> Global ID #T0607700132 <br /> Mr Michael J Infurna Jr Confirmation#3701686680 <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 /> ARCO Products Company Station #9600 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Ist Quarter 2002, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the First Quarter 2002, 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 First Quarter 2002 <br /> Thrifty has retained the services of Earth Management Company (EMC) to conduct quarterly <br /> monitoring and sampling,monthly sampling,and operation and maintenance activities for the on-site <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 42 80 feet below ground surface(bgs) <br /> in monitoring well MW-5 to 44 79 feet bgs in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon February 13,2002 data is presented as Figure 1,and <br /> it appears that groundwater flows toward the east with a approximate gradient ranging from 0 005 <br /> to 0 008 ft/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, T13-1, T13-7, T13-8, and TB-10 on <br /> February 13, 2002 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 analyzed <br /> for total petroleum hydrocarbons (TPH-g)by EPA method 8015M modified for gasoline, for volatile <br /> aromatic compounds of benzene, toluene, ethylbenzene, and xylenes (BTEX), with selected <br /> IF <br /> 13539 E Foster Road, Santa Fe Springs, CA 90670-0138 • (562) 923-9876 <br />