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THRIFTY OIL CO. <br /> • October 25, 2005 0.61415 <br /> Mr Mike Infurna, Jr RWQCB #390652 <br /> Senior REHS Global ID #T0607700504 <br /> County of San Joaquin Confirmation#2529243230 <br /> Public Health Services/Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 Cg NE D <br /> RE Former Thrifty Oil Co. Station #172 2005 <br /> Circle K Station #2705449 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 C , <br /> 3rd Quarter 2005, Status <br /> Dear Mr Infurna <br /> Presented herein is the Third Quarter 2005, Status Report prepared for former Thrifty Oil Co <br /> (Thnfty) Station 9172 located at 7647 Pacific Avenue, Stockton, California(Figure 1) This <br /> report presents the results of the site monitoring and remediation system operation activities <br /> conducted during the third quarter of 2005 Thrifty has retained Earth Management Co (EMC) <br /> to conduct 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 August 24, 2005, is presented in Table 1. In general, <br /> groundwater occurs under the site at depths ranging from 33 94 feet below top of casing(btc) in <br /> monitoring well MW-5 to 36 50 feet btc in monitoring well MW-6 (Appendix A) A <br /> groundwater elevation contour map based upon August 24, 2005, data is presented as Figure 2 <br /> Groundwater appears to flow to the northeast at an approximate hydraulic gradient ranging from <br /> 0 0108 to 0 0333 feet/foot <br /> Quarterly Groundwater Sampling <br /> As part of the groundwater-monitoring program, groundwater samples were obtained from <br /> monitoring wells MW-3 through MW-11 (except MW-8, which was abandoned) Groundwater <br /> samples were obtained by EMC on August 24, 2005, and delivered in a chilled state, in an ice <br /> chest, following strict Chain-of-Custody procedures to a state certified laboratory These <br /> samples were analyzed for volatile aromatic compounds benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) and selected oxygenates (including MTBE)by EPA Method 8260B, and for <br /> total petroleum hydrocarbons as gasoline (TPHg)by EPA Method 8015M Ethanol and <br /> methanol were analyzed by ASTM Method 8015M EMC field sampling forms are provided in <br /> Appendix A. <br /> Qo <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 • (562) 921-3581 <br />