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<br /> Second Quarter 2004
<br /> Thrifty#171
<br /> July 20, 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 monitoring well MW-5 (5,430 ug/L and 7,980
<br /> t ug/L, respectively) The highest benzene concentration(1 4 ug/L) was detected in well TB-8
<br /> DIPE, ETBE, TAME, and TBA were not detected with the exception of TAME (18 ug/L) and
<br /> TBA (1,730 ug/L) in well MW-5 Ethanol and methanol were not detected above 20 milligrams
<br /> per liter
<br /> Remediation Status
<br /> On Jul 1 1999 a Baker Furnace Thermal Oxidizer Unit was laced into operation, to destroy
<br /> Y P P � Y
<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, T13-9 (A, B), TB-11 (A, B), and TB-12
<br /> (A, E) 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 1,121 hours
<br /> and approximately 1,161 pounds of hydrocarbon as TPHg were removed this quarter as of June
<br /> 24, 2004 (Table 3) The cumulative system total as of June 24, 2004, was approximately 29,594
<br /> hours of operation and approximately 138,523 pounds of hydrocarbon as TPHg removed The
<br />' system operated throughout the quarter except when it was shut down for quarterly water
<br /> sampling from May 10 though May 18, 2004 The system was also found to be down on April 5,
<br /> April 26, May 3, 2004, and June 14 through June 24, 2004, due to mechanical problems In each
<br />' case, the system was restarted the same day with the exception of the blower motor that was
<br /> repaired in June 2004 Field records of the SVE system are provided in Appendix C
<br />' Vapor samples were collected from the system inlet and outlet ports on April 5, May 10, and
<br /> June 7, 2004 Vapor samples from selected wells were collected on May 10, 2004 The samples
<br /> were analyzed for TPHg by EPA Method 8015M for gasoline, BTEX, and MTBE by EPA
<br />' 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
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