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' THRIFTY C3IL CO . <br /> April 10, 2001 <br /> Mr Michael J Infurna Jr <br /> Senior REHS <br /> County of San Joaquin <br /> Site Mitigation Unit IVILOP <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 /> 1st Quarter 2001, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the First Quarter 2001, 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 2001 <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 39 61 <br /> feet below ground surface(bsg)in monitoring well MW-5 to 42 17 feet bgs in monitoring well TB-8 <br /> (Appendix A) A groundwater elevation contour map based upon February 14, 2001 data is <br /> presented as Figure 1, and data indicates that groundwater flows towards a groundwater depression <br /> in the area of well TB-8 <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-b, TB-1, TB-7, TB-8, and TB-10 on <br /> 13539 E Foster Road, Santa Fe Springs, CA 90670-0138 • (562) 923-9876 <br />