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r " THRIFTY C3IL CO . <br /> January 29, 2002 RWQCB #390652 <br /> Global ID #T0607700504 <br /> Mr Mike Infurna, Jr Confirmation #7920099258 <br /> Senior REHS <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 4172 <br /> TOSCO Station #2705449 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> 4th Quarter 2001,Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Fourth Quarter 2001, Status Report prepared for former Thrifty Oil Co <br /> (Thrifty) Station#172 located at 7647 Pacific Avenue, Stockton, California (Figure 1) Presented <br /> in this report are the results of the site monitoring and remediation system operation activities <br /> conducted during the Fourth Quarter 2001 Thrifty has retained Earth Management Co (EMC) to <br /> conduct quarterly monitoring and 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 November 8, 2001 is presented in Table 1. In general, <br /> groundwater occurs under the site at depths ranging from 33 75 feet below ground surface (bgs) in <br /> monitoring well MW-5 to 40 59 feet bgs in monitonng well MWA I (Appendix A) A groundwater <br /> elevation contour map based upon November 8, 2001 data is presented as Figure 1 Groundwater <br /> flow direction beneath the site is toward a depression near well MW-11,with gradients ranging from <br /> 0 04 feet/foot to 0 08 feet/foot The groundwater depression surrounding well MW-11 is the results <br /> of it being an active groundwater pumping well <br /> Quarterly Groundwater Sampling <br /> As part of the groundwater monitoring program, groundwater samples were obtained from <br /> monitoring wells MW-3 through MW-I1, except MW-8 which was abandoned Groundwater <br /> samples were obtained by EMC on November 8, 2001 and delivered in a chilled state, in an ice <br /> • chest, following strict Cham-of-Custody procedures to a state certified laboratory These samples <br /> were analyzed for volatile aromatic compounds of benzene, toluene, ethylbenzene, and xylenes <br /> 13539 F Foster Road, Santa Fe Springs, CA 90670-0138 • (562) 923-9876 <br />