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{
<br /> . "Methyl Ether(TAME), and Tert-Butanol (TBA))using EPA method 8260B Ethanol and methanol
<br /> were also analyzed by ASTM method D285
<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 isoconcentration 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 (17,800 ug/L, 213 ug/L, and
<br /> 21,700 ug/L, respectively) The selected oxygenate concentrations were below laboratory detection
<br /> limits, except TBA in well MW-5 (974 ug/L)
<br /> Concentrations of methanol and ethanol were not detected above laboratory detection limits in any
<br /> of the wells sampled this quarter It has been over one year without detecting these analytes in the
<br /> groundwater samples Therefore, Thnfty respectfully requests for cessation of the requirement for
<br /> methanol and ethanol analysts 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 wells
<br /> MW-2, MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A, B), TB-1 I (A, B), and TB-12 (A, B) A
<br /> map presenting the extraction well layout is shown as Figure 5 The only wells operating this
<br /> quarter were TB-I 1 wtr, MW-5, and T13-3
<br /> During this reporting period, the soil vapor extraction unit (VEU) operated approximately 1,612
<br /> hours and approximately 1,541 pounds of TPH-g were removed this quarter as of June 24, 2003
<br /> (Table 3 and Appendix C) The cumulative system total as of June 24, 2003 is approximately
<br /> 22,636 hours of operation, and approximately 129,589 pounds of TPH-g removed The system
<br /> operated throughout the quarter
<br /> Vapor samples were collected from the system inlet and outlet ports on April 8, May 13, and June
<br /> 17, 2003, and also from selected site wells on May 13, 2003 The samples were analyzed for TPH-g
<br /> by EPA method 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 hydrocarbons
<br /> removed by vapor extraction is presented in Table 3, and individual well vapor concentrations are
<br /> included in Table 4 Field Status System Reports are presented in Appendix C
<br />
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