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<br /> • A summary of historical analytical sampling results for TPHg, BTEX, and MTBE is provided in
<br /> Table 1, and oxygenate/alcohol results are summarized in Table 2 Copies of the EMC Field
<br /> Status Reports are presented in Appendix A, and copies of the laboratory analytical reports are
<br /> contained in Appendix B
<br /> TPHg,benzene, and MTBE isoconcentration maps are presented as Figures 2, 3, and 4,
<br /> respectively The analytical laboratory results indicate that the highest groundwater
<br /> concentrations of TPHg,benzene, and MTBE were found in monitoring well MW-5 (179,000
<br /> ug/L, 6,630 ug/L, and 11,600 ug/L, respectively) The selected oxygenate concentrations were
<br /> below laboratory detection limits, however, the method detection limits were elevated for DIPE,
<br /> ETBE,TAME, and TBA in well MW-5
<br /> Ethanol and methanol were not detected above laboratory detection limits in any of the wells
<br /> with the exception of ethanol at 62 ug/L in well MW-5 It has been over one year without
<br /> detecting methanol in the groundwater samples Therefore, Thrifty respectfully repeats its
<br /> request for cessation of the requirement for methanol analysis at this site
<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
<br /> wells MW-2, MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A, B), TB-11 (A, B), and TB-12
<br /> (A, B) A map presenting the extraction well layout is shown as Figure 5 The only wells
<br /> operating this quarter were TB-11 wtr, MW-5, and TB-3
<br /> During this reporting period, the soil vapor extraction unit operated approximately 1,737 hours
<br /> and approximately 3,558 pounds of hydrocarbon as TPHg were removed this quarter as of
<br /> December 15, 2003 (Table 3) The cumulative system total as of December 15, 2003, was
<br /> approximately 26,470 hours of operation and approximately 134,187 pounds of hydrocarbon as
<br /> TPHg removed The system operated throughout the quarter except when it was shut down for
<br /> quarterly water sampling from November 18 though November 25, 2003 Field records of the
<br /> SVE system are provided in Appendix C
<br /> Vapor samples were collected from the system inlet and outlet ports on October 10, October 14,
<br /> November 18, and December 8, 2003 The samples were analyzed for TPHg by EPA Method
<br /> 8015M for gasoline, BTEX, and MTBE by EPA Method 8021B
<br /> A copy of the vapor well-head laboratory analytical results and copies of vapor inlet/outlet
<br /> laboratory analytical results are presented in Appendix D A historical summary of
<br /> hydrocarbons removed by vapor extraction is presented in Table 3, and individual well vapor
<br /> concentrations are included in Table 4 Field Status System Reports are presented in Appendix
<br /> C
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