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THRIFTY OIL CO. <br /> 1 <br /> ' July 14, 2004 0.48103 <br /> Mr Mike Infnrna, Jr RWQCB #390652 <br /> ' Senior REHS Global ID #T0607700504 <br /> County of San Joaquin Confirmation #3633576810 <br /> Public Health Services/Environmental Health Division <br /> ' 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 n <br /> ' RE Former Thrifty Oil Co. Station #172 �o c <br /> TOSCO Station #2705449 0 <br /> 7647 Pacific Avenue <br /> ' Stockton, CA 95207 Jv <br /> 2nd Quarter 2004, Status Report > Q <br /> Dear Mr Infurna <br /> ' Presented herein is the Second Quarter 2004, 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 2004 Thrifty has retained Earth Management Co <br /> 10 (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 5, 2004, is presented in Table 1. In general, groundwater <br /> occurs under the site at depths ranging from 35 02 feet below top of casing (btc) in monitoring <br /> well MW-5 to 37 52 feet btc in monitoring well MW-9 (Appendix A) A groundwater elevation <br />' contour map based upon May 5, 2004, data is presented as Figure 2 Groundwater appears to <br /> flow to the southeast at an approximate hydraulic gradients of 0 003 feet/foot Depth to water <br /> data from wells MW-6 and MW-9 was not used because the data appeared to be anomalous when <br />' compared to the onsite data <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 5, 2004, and delivered in a chilled state, in an ice chest, <br /> following strict Cham-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 D285 <br /> Qo <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670 •(562) 921-3581 <br />