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` (DIPS), Ethyl tert-Butyl Ether(ETBE), Methyl tert-Butyl Ether (MTBE), Tert-Amyl Methyl Ether
<br /> (TAME), and Tert-Butanol (TBA)) using EPA method 8260B Ethanol and methanol were also
<br /> analyzed by ASTM method D285
<br /> I
<br /> A summary of historical analytical sampling results for TPH-g, BTEX, and MTBE is provided in
<br /> Table 1, and oxygenate/alcohol results are summarized in Table 2 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 1 so concentration maps are presented as Figures 2, 3, and 4,
<br /> respectively The analytical laboratory results indicate that the highest groundwater concentrations
<br /> of TPH-g, benzene, and MTBE were found in monitoring well MW-5 (166,000 ug/L, 12,700 ug/L,
<br /> and 40,400 ug/L, respectively) The selected oxygenate concentration were below laboratory
<br /> detection limits, except for DIPE, TAME, and TBA The DIPE concentrations was 1 1 ug/L, in well
<br /> MW-3R, TAME concentrations were 10 ug/L, 9 6 ug/L, 9 5 ug/L, 16 ug/L and 1 3 ug/L in wells
<br /> MW-2, TB-1, TB-5, TB-8, and TB-10, respectively The TBA concentrations were 189 ug/L, 1,750
<br /> ug/L, 112 ug/L, 38 ug/L, 26 ug/L and 40 ug/L, in wells MW-2, MW-5, T13-1, TB-7, TB-8, and TB-
<br /> 10, respectively All alcohol concentrations were below laboratory detection limits (Appendix B)
<br /> Remediation Status
<br /> On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation, to destroy
<br /> vapors extracted by the SVE system Presently, the remediation system is connected to SVE wells
<br /> MW-2, MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A, B), TB-II (A, B), and TB-12 (A, B) A
<br /> map presenting the extraction well layout is shown as Figure 5 At the beginning of the quarter the
<br /> only wells operating were TB-3, TB-4, TB-6, and TB-9 (A, B) Subsequently, wells, MW-5 and TB-
<br /> 7 were also included into the operation on October 29 and November 5, 2002, respectively Wells
<br /> T13-9 (A B), TB-4 TB-6, and TB-3 were subsequently shut down, and extraction was focused on
<br /> wells MW-5 and TB-7 during the latter portion of the quarter
<br /> During this reporting period, the soil vapor extraction unit (VEU) operated approximately 2,287
<br /> hours and approximately 20,706 pounds of TPH-g were removed this quarter as of December 31,
<br /> 2002 (Table 3 and Appendix C) The cumulative system total to date is approximately 19,354 hours
<br /> of operation, and approximately 87,538 pounds of TPH-g removed The system operated throughout
<br /> the quarter
<br /> Vapor samples were collected from the system inlet and outlet ports on October 9, November 14,
<br /> and December 11, 2002, and also from selected site wells on November 14, 2002 The samples were
<br /> analyzed for TPH-g by EPA method 8015M for gasoline, BTEX, and MTBE by EPA method
<br /> 8021 B The effluent vapor laboratory results for October 9, 2002 indicated that TPH-g concentration
<br /> was 30 ug/L The effluent vapor laboratory results for October 9, and November 14, 2002 indicated
<br /> that benzene concentrations were 0 10 ug/L, and 0 03 ug/L The effluent air sample results are within
<br /> the San Joaquin Valley Air Pollution Control District requirements
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