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Thrifty Oil Co. Station #172 <br /> Page3 <br /> A historical summary of hydrocarbons removed by vapor extraction is presented in Table 3, vapor <br /> sample analytical results for the individual wells sampling are presented in Table 5 <br /> Groundwater Treatment System <br /> The groundwater treatment system was started in conjunction with the vapor treatment system on <br /> April 26,2001,and the flow meter started at zero Presently,the remediation system is connected to <br /> groundwater wells MW-10 and MW-11 Two down-well pneumatic pumps(one in each well)draw <br /> water into a 150-gallon polyvinyl tank,which then transfers the water through two(2)one thousand- <br /> pound granular activated carbon canisters in series <br /> During the reporting period, the system was shut down on the following dates July 30 restarted on <br /> August 8, 2003, for a carbon change, August 18 restarted on August 21, 2003, for quarterly water <br /> sampling,and September 5 restarted on September 24,2003,for a carbon change and replacement of <br /> a water meter A total of 8,958 gallons of water were treated and discharged during the reporting <br /> period, and 106,414 gallons had been treated and discharged since the commencement of <br /> groundwater treatment Historical groundwater system operations are reported in Table 4 and 4b, <br /> and the quarterly analytical results are presented in Appendix E <br /> Summary and Recommendations <br /> The soil vapor and groundwater extraction systems were started on April 26,2001 A total of 73,850 <br /> pounds of hydrocarbons have been destroyed by the vapor extraction system,and 106,414 gallons of <br /> groundwater have been treated by the groundwater system During the reporting period, Thrifty <br /> removed well MW-10 for the groundwater treatment system due to declining hydrocarbon <br /> concentrations and is now focusing groundwater cleanup efforts only on well MW-11 <br /> Thrifty will continue quarterly groundwater monitoring, gauging, purging, and sampling of the <br /> groundwater monitoring wells, and operation of the remediation system <br /> All interpretations expressed in this report are based solely upon review of data collected by EMC <br /> and laboratory analyses by Associated Laboratories <br /> Respectfully submitted, <br /> Michael H Bowery, R G <br /> • Project Manager <br />