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Y s <br /> THRIFTY OIL CC3. <br /> i <br /> April 24, 2000 <br /> r t <br /> 1 <br /> ) <br /> Mr Michael J Infurna Jr APR 01 2000 <br /> Senior REHS <br /> Site Mitigation Unit IV/LOP ENVIR0N'1\ifLj\j f'-%L HEALTH <br /> 304 East Weber St , Fifth Floor PER[dAIT/ SERVICES <br /> Stockton, CA 95202 <br /> RE Former Thrifty Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> lst Quarter 2000, Status Report <br /> Dear Mr Inform <br /> • Presented herein is the First 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 efforts conducted during the First Quarter 2000 Thrifty has <br /> retained the services of Earth Management Company (EMC) to conduct quarterly monitoring and <br /> 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 38 64 <br /> feet below ground surface(bsg)in monitoring well TB-1 to 43 56 feet bgs in monitoring well MW-6 <br /> (Appendix A) A groundwater elevation contour map based upon February 9,2000 data is presented <br /> as Figure 1, and the direction of groundwater flow is toward the east and south with a hydraulic <br /> gradient ranging from of approximately 0 02 feet/foot to 0 09 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 /> February 9, 2000 Groundwater samples were obtained by EMC and delivered in a chilled state <br /> 13539 E Foster Rd,Santa Fe Springs,CA 90670-0138•(562)923-9876 <br />