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#A THRIFTY OIL CO. <br /> x <br /> • July 21, 2005 0.58865 <br /> Mr Mike Infurna, Jr RWQCB #390652 <br /> Senior REHS Global ID #T0607700504 <br /> County of San Joaquin Confirmation#8944886565 <br /> Public Health Services/Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor n������ <br /> Stockton, CA 95202 R1] <br /> D I <br /> RE Former Thrifty Oil Co. Station #172 JUL 2 5 2005 <br /> Circle K Station #2705449 ENVIRONMENI HEALTH <br /> 7647 Pacific Avenue PERMIT/SERVICES <br /> Stockton, CA 95207 <br /> 2nd Quarter 2005, Status <br /> Dear Mr Infurna <br /> Presented herein is the Second Quarter 2005, Status Report prepared for former Thrifty Oil Co <br /> (Thrifty) Station#172 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 second quarter of 2005 Thrifty has retained Earth Management Co <br /> (EMC) 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 May 11, 2005, is presented in Table 1. In general, <br /> groundwater occurs under the site at depths ranging from 33 36 feet below top of casing (btc) in <br /> monitoring well MW-5 to 35 10 feet bte in monitoring well MW-11 (Appendix A) A <br /> groundwater elevation contour map based upon May 11, 2005, data is presented as Figure 2 <br /> Groundwater appears to flow to the northwest and northeast at an approximate hydraulic gradient <br /> ranging from 0 0096 to 0 0135 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 May 11, 2005, and delivered in a chilled state, in an ice chest, <br /> following strict Chain-of-Custody procedures to a state certified laboratory These samples were <br /> analyzed for volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX) <br /> and selected oxygenates (including MTBE) by EPA Method 8260B, and for total petroleum <br /> hydrocarbons as gasoline (TPHg) by EPA Method 8015M Ethanol and methanol were analyzed <br /> by ASTM Method 8015M EMC field sampling forms are provided in Appendix A. <br /> Qo <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670• (562) 921-3581 <br />