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Fourth Quarter 2004
<br /> Thrifty#171
<br /> January 18, 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 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 (149,000
<br /> ug/L, 15,200 ug/L, and 19,900 ug/L, respectively) D1PE, ETBE, TAME, and TBA were not
<br /> detected with the exception of TBA in wells MW-2 (253 ug/L), MW-3 (58 ug/L), MW-5 (2,220
<br /> ug/L), MW-6 (258 ug/L), T13-8 (56 ug/L), TB-9 (54 ug/L), and TB-12 (6,400 ug/L) Ethanol and
<br /> methanol were not detected above 20 milligrams per liter A trace concentration of 4 3 ug/L 1,2-
<br /> DCA was detected in well TB-10, but was not detected in the other wells
<br /> Remediation Status
<br /> iOn July 1, 1999, a Balser 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, T13-3, 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 967 hours and
<br /> approximately 1,169 pounds of hydrocarbon as TPHg were removed this quarter as of December
<br /> 27, 2004 (Table 3) The cumulative system total as of December 27, 2004, was approximately
<br /> 31,138 hours of operation and approximately 141,751 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 November 22 though November 29, 2004 The system was also found to be
<br /> down on October 11, October 18, October 25, November 8, November 22, December 13,
<br /> December 20, and December 27, due to mechanical problems In each case, the system was
<br /> restarted the same day Field records of the SVE system are provided in Appendix C
<br /> Vapor samples were collected from the system inlet and outlet ports on October 11, 2004,
<br /> November 8, 2004, and December 6, 2004 Vapor samples from selected wells were collected on
<br /> November 8, 2004 The samples were analyzed for TPHg by EPA Method 8015M for gasoline,
<br /> BTEX, and MTBE by EPA Method 8021B
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