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t Y <br /> First Quarter 2004 <br /> Thrifty#172 <br /> April 21, 2004 <br /> Page 3 <br /> Influent and effluent vapor samples were collected on January 20, February 12„ and March 16, <br /> 2004 In addition, vapor samples were collected on February 12, 2004, from selected well heads <br /> The well head, influent, and effluent vapor samples were analyzed for TPHg by EPA Method <br /> 8015, and BTEX/MTBE by EPA Method 8021B Field Status Reports are included in Appendix <br /> C Copies of the influent, effluent, and well head vapor sample laboratory analytical results are <br /> presented in Appendix D <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 <br /> connected to groundwater well MW-11 A down-well pneumatic pump draws water into a 150- <br /> gallon polyvinyl tank, which then transfers the water through two (2) one thousand-pound <br /> . granular activated carbon canisters in series <br /> During the reporting period, the system was shut down on the following dates January 7 and <br /> restarted on January 13, 2004 and February 3 restarted on February 12, 2004, and March 11 <br /> restarted on March 16, 2004, for carbon change out The system was down when quarterly <br /> sampling took place on February 5, 2004 A total of 97,550 gallons of water were treated and <br /> discharged during the reporting period, and 230,354 gallons had been treated and discharged <br /> since the commencement of groundwater treatment Historical groundwater system operations <br /> are reported in Table 4 and 4b, 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 <br /> 84,585 pounds of hydrocarbons have been destroyed by the vapor extraction system, and 230,354 <br /> gallons of groundwater have been treated by the groundwater system Due to declining dissolved <br /> hydrocarbon concentrations in other onsite wells, Thrifty focused groundwater cleanup efforts <br /> only on well MW-11 during the reporting period <br /> • <br />