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• Fourth Quarter 2005 Thrifty#171 Page 2 A summary of historical analytical sampling results for TPHg, BTEX, and MTBE is provided in Table 1, and oxygenate/alcohol results are summarized in Table 2 Copies of the EMC Field Status Reports are presented in Appendix A, and copies of the laboratory analytical reports are contained in Appendix B TPHg, benzene, and MTBE lsoconcentration maps are presented as Figures 3, 4, and 5, respectively The analytical laboratory results indicate that the highest concentration of TPHg was detected in extraction well EW-5s(36,600 ug/L) The highest concentration of benzene was detected in well MW-2 (140 ug/L) and the highest concentration of MTBE was detected in extraction well EW-5d (454 ug/L) ETBE was not detected above the detection limit DIPE was detected in wells MW-2 and TB-1 at a maximum concentration of 15 ug/L in TB-1 TAME was detected in only one well (TB-1) at 17 ug/L TBA was detected in wells MW-2 and TB-1 at a maximum concentration of 108 ug/L in TB-1 Ethanol and methanol were not detected above 20 milligrams per liter 1,2-DCA was detected at 18 ug/L in well MW-2 and at trace concentrations of 3 7J ug/L and 3 IJ ug/L in wells MW-3R and TB-10, respectively The detection limits of several compounds including DIPE, ETBE, TAME, TBA, and 1,2-DCA was elevated in wells EW-5s and EW-5d Remediation Status • On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation, to destroy vapors extracted by the SVE system Presently, the remediation system is connected to SVE wells MW-2, MW-4, TB-3, TB-4, TB-6, TB-7, TB-9 (A, B), TB-11 (A, B), and TB-12 (A, B) A map presenting the extraction well layout is shown as Figure 6 The only well operating this quarter was VE-5 (100%) ' During this reporting period, the soil vapor extraction unit operated approximately 700 hours and approximately 1,336 pounds of hydrocarbon as TPHg were removed as of September 29, 2005 (Table 3) The cumulative system total as of December 27, 2005, was approximately 33,237 hours of operation and approximately 144,252 pounds of hydrocarbon as TPHg removed Field records of the system are provided in Appendix C Effluent and influent vapor samples were collected on October 5, 2005 and on November 14, 2005 and were analyzed for TPHg by EPA Method 8015M and for BTEX, MTBE and other oxygenates by EPA Method 8021B A historical summary of hydrocarbons removed by vapor extraction is presented in Table 3, and individual well vapor concentrations are included in Table 4 The analytical results for the vapor samples are provided in Appendix D •