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• oxygenates using EPA method 8260B, and for ethanol and methanol by method D285
<br /> The oxygenates that were analyzed are Di-isopropyl ether (DIPS), Ethyl tert-Butyl Ether(ETBE),
<br /> Methyl tert-Butyl Ether (MTBE), Tert-Amyl Methyl Ether (TAME), and Tert-Butanol (TBA) A
<br /> summary of historical analytical sampling results for TPH-g, BTEX, and MTBE are provided in
<br /> Table 1, and oxygenate/alcohol results are summarized in Table 3 Copies of the EMC Field Status
<br /> Reports are presented in Appendix A, and copies of the laboratory analytical reports are contained
<br /> in Appendix B
<br /> The TPH-g, benzene, and MTBE isoconcentration maps are presented as Figures 2, 3, and 4 The
<br /> analytical laboratory results indicate that the highest groundwater concentrations of TPH-g,
<br /> benzene, and MTBE were in monitoring well MW-5 101,000 ug/L, 7,260 ug/L, and 23,800 ug/L,
<br /> respectively All oxygenates (except MTBE) were below laboratory detection limits, except for a
<br /> DIPE concentrations of 2 5 ug/L (TB-8) and 12 ug/L (TB-1), TBA concentrations of 53 ug/L (MW-
<br /> 3R), 103 ug/L (TB-1), 8 6 ug/L (TB-8), 78 ug/L (TB-10), and 6,400 ug/L (TB-12) All alcohols
<br /> were below laboratory detection limits,except Methyl Alcohol (Methanol) concentration of 4 6 ug/L
<br /> (TB-12) (Appendix B)
<br /> Remediation Status
<br /> On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation with the hour
<br /> meter reading starting at 13,312 hours Presently, the remediation system is connected to soil vapor
<br /> extraction wells MW-2, MW-4, MW-5, TB-3, T134, TB-6, TB-7, TB-9 (A,B), TB-11 (A,B), and
<br /> TB-12 (A,B) A map showing the extraction well layout is shown as Figure 5 During this quarter
<br /> the only wells operating were TB-3, T13-4, TB-6, and T13-9 (A,B)
<br /> During this reporting period, the soil vapor extraction unit (VEU) operated approximately 1,536
<br /> hours and approximately 2,083 pounds of TPH-g were removed this quarter as of March 26, 2002
<br /> (Table 2 and Appendix C) The cumulative system total to date is approximately 15,002 hours of
<br /> operation, and approximately 62,941 pounds of TPH-g removed The system was shut down for an
<br /> aquifer characterization test from March 14 to March 19, 2002 While the system was shut down
<br /> the hour meter was changed out and the new meter started at 0000 (zero)
<br /> Vapor samples were collected from the system's inlet and outlet ports on January 15, February 27,
<br /> March 12, 2002, and the inlet, outlet (ports), and selected site wells (Table 4) on February 7, 2002
<br /> (Figure 5) The samples were analyzed for TPH-g by EPA method 8015M for gasoline, and
<br /> BTEX/MTBE by EPA method 8021B The effluent vapor laboratory results for March 12, 2002
<br /> indicated that TPH-g concentration was 44 ug/L,and with benzene, and MTBE concentrations below
<br /> the method detection limit A copy of the vapor well-head laboratory analytical results, and copies
<br /> of vapor inlet/outlet laboratory analytical results are presented in Appendix D A historical summary
<br /> of hydrocarbons removed by vapor extraction is presented in Table 2 Field Status System Reports
<br /> are presented in Appendix C
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