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<br /> . Third Quarter 2004
<br /> Thrifty#171
<br /> October 19, 2004
<br /> Page 2
<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 and MTBE were found in monitonng well MW-5 (3,240 ug/L and 3,650
<br /> ug/L, respectively) The highest benzene concentration (3 3 ug/L) was detected in well TB-10
<br /> DIPE, ETBE, TAME, and TBA were not detected with the exception of TAME (31 ug/L) in well
<br /> MW-5 and TBA in well MW-5 (1,520 ug/L) Ethanol and methanol were not detected above 20
<br /> milligrams per liter
<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(50%), MW-5 (100%), and TB-3 (50%)
<br /> During this reporting period, the soil vapor extraction unit operated approximately 577 hours and
<br /> approximately 2,059 pounds of hydrocarbon as TPHg were removed this quarter as of September
<br /> 27, 2004 (Table 3) The cumulative system total as of September 27, 2004, was approximately
<br /> 30,171 hours of operation and approximately 140,582 pounds of hydrocarbon as TPHg removed
<br /> The system operated throughout the quarter except when it was shut down for quarterly water
<br /> sampling from August 16 though August 23, 2004 The system was also found to be down on
<br /> July 19, July 26, August 2, August 10, and August 30, 2004, due to mechanical problems In
<br /> each case, the system was restarted the same day The system was also off from September 8
<br /> through September 27, 2004, due to system technician vacation time off 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 July 7 and August 16,
<br /> 2004 Samples were not collected in September because the system was down for most of the
<br /> month Vapor samples from selected wells were collected on August 16, 2004 The samples
<br /> were analyzed for TPHg by EPA Method 8015M for gasoline, BTEX, and MTBE by EPA
<br /> Method 8021B
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