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First Quarter 2005
<br /> Thn fly#171
<br /> April 13, 2005
<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 i so concentration 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 (118,000
<br /> ug/L, 18,200 ug/L, and 22,100 ug/L, respectively) DIPE, ETBE, TAME, and TBA were not
<br /> detected with the exception of DIPE in wells MW-2 (2 9 ug/L), TB-1 (41 ug/L), and TB-8 (5
<br /> ug/L), TAME in well MW-2 (21 ug/L), and TBA in wells MW-2 (215 ug/L), MW-5 (1,520
<br /> ug/L), TB-1 (144 ug/L), TB-8 (24 ug/L), and TB-10 (28 ug/L) Ethanol and methanol were not
<br /> detected above 20 milligrams per liter A trace concentration of 4 6J ug/L 1,2-DCA was detected
<br /> in well TB-10, but was not detected in the other wells
<br /> Remediation Status
<br /> MOn 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, T13-4, TB-6, TB-7, T13-9 (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 1,334 hours
<br /> and approximately 1,127 pounds of Hydrocarbon as TPHg were removed this quarter as of March
<br /> 21, 2005 (Table 3) The cumulative system total as of March 21, 2005, was approximately
<br /> 32,472 hours of operation and approximately 142,878 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 February 7 though February 14, 2005 The system was also found to be down on
<br /> March 21, 2005, due to mechanical problems The system was restarted the same day Field
<br /> records of the SVE system are provided in Appendix C
<br /> Vapor samples were collected from the system inlet and outlet ports on February 7, 2005 and
<br /> March 7, 2005 Vapor samples from selected wells were collected on February 7, 2005 The
<br /> samples were analyzed for TPHg by EPA Method 8015M for gasoline, BTEX, and MTBE by
<br /> EPA Method 8021B
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