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THRIFTY OIL CO. <br /> July 23, 2003 RWQCB #390652 <br /> Global ID #T0607700504 <br /> Mr Mike Infurna, Jr Confirmation#6450508356 <br /> Senior RENS <br /> County of San Joaquin <br /> Public Health Services/Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> RE Former Thrifty Oil Co. Station #172 <br /> TOSCO Station #2705449 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> 2nd Quarter 2003, Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Second Quarter 2003, Status Report prepared for former Thrifty Oil Co <br /> (Thrifty) Station #172 located at 7647 Pacific Avenue, Stockton, California(Figure 1) This report <br /> presents the results of the site monitoring and remediation system operation activities conducted <br /> during the second quarter of 2003 Thrifty has retained Earth Management Co (EMC) to conduct <br /> quarterly monitoring, sampling, and remediation activities at this site <br /> Groundwater Monitoring <br /> Depth to groundwater is measured in each monitoring well on a quarterly basis Gauging data <br /> obtained from June 1991 through May 21, 2003 is presented in Table 1. In general, groundwater <br /> occurs under the site at depths ranging from 32 13 feet below ground surface (bgs) in monitoring <br /> well MW-5 to 39 47 feet bgs in monitoring well MW-11 (Appendix A) A groundwater elevation <br /> contour map based upon May 21, 2003 data is presented as Figure 2 Groundwater appears to flow <br /> radially towards a depression near groundwater monitoring wells MW-10 and MW-11 (which are <br /> also used as groundwater extraction wells, with a hydraulic gradient ranging from approximately <br /> 0 05 feet/foot to 0 14 feet/foot The groundwater extraction system was shut down on May 20, 2003 <br /> for quarterly water sampling and restarted on May 21, 2003 after the water sampling event It is <br /> apparent from the groundwater elevation data that the groundwater levels in wells MW-10 and MW- <br /> 11 remained depressed from the recent pumping activities, and had not yet rebounded to static levels <br /> Thus, the groundwater system appears to be working as designed, to draw the contaminated water <br /> i <br /> Qo <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 • (562) 921-3581 <br />