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+r , THRIFTY OIL CC3 . January 5, 2000 Mr Mike Infurna, Jr Senior REHS County of San Joaquin Public Health Services/Environmental Health Division 304 East Weber Avenue, 3rd Floor Stockton, CA 95202 RE Former Thrifty Oil Co. Station #172 7647 Pacific Avenue Stockton, CA 95207 41h Quarter 1999,Status Report Dear Mr Infurna Presented herein is the Fourth Quarter 1999, Status Report prepared for Former Thrifty Oil Co (Thrifty) Station#172 located at 7547 Pacific Avenue, Stockton, California(Figure 1) Presented in this report are the results of the site monitoring efforts conducted during the Fourth Quarter 1999 Thrifty has retained Earth Management Co (EMC) to conduct quarterly monitoring and sampling activities at this site GROUNDWATER MONITORING Depth to groundwater is measured in each monitoring well on a quarterly basis Gauging data obtained from June 1991 through November 10, 1999 is presented in Table 1. In general, groundwater occurs under water table conditions beneath the station at depths ranging from 35 46 feet below ground surface(bgs)in monitoring well MW-5 to 37 51 feet bgs in monitoring well MW- 4 (Appendix A) A groundwater elevation contour map based upon November 10, 1999 data is presented as Figure 1 Groundwater flow direction beneath the site ranges from 0 01 feet/foot to the west to 0 02 feet/foot to the west and northwest Quarterly Groundwater Sampling As part of the groundwater monitoring program, groundwater samples were obtained from monitoring wells MW-3 through MW-11, except MW-8 which was abandoned Groundwater samples were obtained by EMC and delivered in a chilled state, in an ice chest, following strict Chain-of-Custody procedures to a state certified laboratory and analyzed for volatile aromatic compounds of benzene,toluene, ethylbcnizene, and xylenes by EPA method 8020 and for total VEAVQ—j 13539 E Foster Rd, Santa Fe Springs, CA 90670-0138•(562)923-9876