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0 Thrifty Oil Co. Station #172 Page3 effluent, and sample well-head vapor laboratory analytical results are presented in Appendix D A historical summary of hydrocarbons removed by vapor extraction is presented in Table 3 The Field Status Reports are included in Appendix C Groundwater Treatment System The groundwater treatment system was started in conjunction with the vapor treatment system on April 26, 2001, and the flow meter started at zero Presently, the remediation system is connected to groundwater wells MW-10 and MW-1 I Two-down well pneumatic pumps (one in each well), draws water into a 150 gallon polyvinyl tank which then transfers the water through(2)one thousand pound canisters with activated carbon, using an air compressor During this reporting period, the groundwater extraction system treated and discharged approximately 33,775 gallons as of October 4, 2001, for a total of 61,382 gallons The groundwater remediation system influent and effluent streams were sampled on July 5, and September 12, 2001 for TPH-g by EPA method 8015, BTEX/MTBE by EPA method 8021B EPA method 8260B was used to confirm MTBE concentrations for only the samples collected on September 12, 2001 Field status reports are presented in Appendix C, and laboratory analytical results for the groundwater samples are included in Appendix E Historical groundwater system operations are reported in Table 4 Summary and Recommendations The vapor remediation was started on April 12, 2001, and the groundwater remediation was started on April 26, 2001 for temporary operations A total of 27,183 pounds of hydrocarbons have been destroyed by the vapor extraction system, and 33,775 gallons of groundwater treated by the groundwater system Thrifty requests that the oxygenates sampling scheduled for this site be changed from a quarterly 54 event to an annual event The proposed annual oxygenate sampling event would take place during the 1 st quarter of each year, unless otherwise directed by the County of San Joaquin Public Health Services (CSJPHS) This request is the follow up to a telephone conversation between Mr Raymond C Fnednchsen(Thrifty representative)and Mr Mike Infurna, Jr on December 14, 2000 Thrifty is still awaiting a response from the CSJPHS office Thrifty will continue quarterly groundwater monitoring, gauging, purging and sampling of all is groundwater monitoring wells, and operation of the remediation system