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a1 k which were analyzed are Di-isopropyl ether,Ethanol,Ethyl tert-Butyl Ether,Methanol,Methyl tert- Butyl Ether(MTBE), Tert-Amyl Methyl Ether, and Tert-Butanol Copies of the EMC Field Status Reports are presented in Appendix A, and copies of the laboratory analytical reports are contained in Appendix B The TPH-g, benzene, and MTBE isoconcentration maps are contoured in Figures 2, 3, and 4 The highest groundwater concentration of TPH-g was found in monitoring well TB-7 (59,000 ug/L), and the highest groundwater concentrations of benzene and MTBE were found to monitoring well MW- 5 (6,600 ug/L and 26,000 ug/L, respectively) No other oxygenates (other than MTBE) were detected in any of the samples analyzed Remediation Status On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation with the hour meter reading starting at 13,312 hours Presently, the remediation system is connected to soil vapor extraction wells (MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A,B), TB-11 (A,B), and TB-12 (A,B)) During this reporting period, the soil vapor extraction unit(VEU) operated approximately 2,081 hours during the Fourth Quarter 1999, and approximately 26,624 pounds of total petroleum hydrocarbons for gasoline (TPH-g) were removed (Table 2 and Appendix C) Effluent vapor samples were collected on November 9, 1999 The effluent samples were analyzed for TPH-g by EPA method 8015,and BTEX/MTBE were analyzed by using EPA method 8020 The • effluent laboratory concentration results are as follows TPH-g (37 ug/L), benzene (0 16 ug/L), and MTBE (<1 ug/L) Inlet vapor samples were collected monthly, and well head vapor samples were collected during the November and December sampling events All vapor and water samples collected at this site were sent to American Analytics for analysis A copy of the vapor well-head laboratory analytical results, and copies of vapor inletlout laboratory analytical results are presented in Appendix D A historical summary of hydrocarbons removed by vapor extraction is presented in Table 2 Field Status Reports are included in Appendix C Thrifty will continue the current groundwater monitoring and sampling program All interpretations expressed in this report are based upon review of data collected by EMC Written by Reviewed by RED 13F�� Q��►f3live, 7 Q' (;aygon' d C Friedrichsen, REAII Larry iginbot am Project Manager Registered Geologist 5F CAS-�F� Senior Hydrogeologist