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1 <br /> THRIFTY OIL CO. <br /> October 13, 2004 O 50940 <br /> Mr Mike Infurna, Jr RWQCB #390652 <br /> Senior REHS Global ID #T0607700504 <br />' County of San Joaquin Confirmation #9003368377 <br /> Public Health Services/Environmental Health Division #4291780710 <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> RE Former Thrifty Oil Co. Station #172 G��C� �]�� ��' <br />' Circle K Station #2705449 OCT 18 2004 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 ENV1R0Ni,,'--j,1 Ii[AI_TH <br /> 3rd Quarter 2004, Status Report PERMIT/SERVICES <br />' Dear Mr Infurna <br /> Presented herein is the Third Quarter 2004, Status Report prepared for former Thrifty Oil Co <br />' (Thrifty) Station 4172 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 2004 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 11, 2004, is presented in Table 1. In general, <br />' groundwater occurs under the site at depths ranging from 34 97 feet below top of casing(btc) in <br /> monitoring well MW-6 to 40 38 feet btc in monitoring well MW-4 (Appendix A) A <br /> groundwater elevation contour map based upon August 11, 2004, data is presented as Figure 2 <br />' Groundwater appears to flow to the southeast at an approximate hydraulic gradient of 0 0021 <br /> feet/foot Depth to water data from well MW-6 was not used because the data appeared to be <br /> anomalous when compared to the onsite data <br /> 1 Quarterly Groundwater Sampling <br /> ' As part of the groundwater-momtonng program, groundwater samples were obtained from <br /> monitoring wells MW-3 through MW-1 I (except MW-8, which was abandoned) Groundwater <br /> samples were obtained by EMC on August 11, 2004, 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 D285 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 />