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Second Quarter 2005
<br /> Thnfty#171
<br /> July 28, 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 3, 4, and 5,
<br /> respectively The analytical laboratory results indicate that the highest concentrations of TPHg
<br /> and benzene were detected in extraction well EW-5d (72,100 ug/L and 3,120 ug/L, respectively)
<br /> The highest concentration of MTBE was detected in extraction well EW-5s (924 ug/L) ETBE
<br /> and TAME were not detected above their respective detection limits RIPE was detected in wells
<br /> MW-2, TB-1, and TB-8 at a maximum concentration of 40 ug/L in well TB-1 TBA was
<br /> detected in wells TB-1, TB-7, and TB-8 at a maximum concentration of 257 ug/L in well TB-1,
<br /> Ethanol and methanol were not detected above 20 milligrams per liter 1,2-DCA was detected at
<br /> 20 ug/L in well MW-3R and at trace concentrations of 1 5J ug/L and 3 7J ug/L in wells MW-2
<br /> and TB-10, respectively
<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, TB-3, TB-4, TB-6, TB-7, TB-9 (A, B), TB-11 (A, B), and TB-12 (A, B) A
<br /> map presenting the extraction well layout is shown as Figure 6 The only wells operating this
<br /> quarter were TB-11 (50%) and TB-3 (50%)
<br /> During this reporting period, the soil vapor extraction unit operated approximately 29 hours and
<br /> approximately 23 pounds of hydrocarbon as TPHg were removed as of April 11, 2005 (Table 3)
<br /> Following well abandonment of MW-5 in March 2005, the main conveyance line was
<br /> inadvertently uncapped causing lower inlet concentrations and, therefore, the system was shut
<br /> down on April 11, 2005 GeoHydrologic Consultants, Inc (GHC) uncovered the system piping
<br /> on July 2, 2005, and connected newly installed vapor extraction well VW-5 The SVE system
<br /> was restarted on July 7, 2005 The cumulative system total as of April 11, 2005, was
<br /> approximately 32,494 hours of operation and approximately 142,901 pounds of hydrocarbon as
<br /> TPHg removed Field records of the system are provided in Appendix C
<br /> Effluent and influent vapor samples were collected on April 11, 2005 and were analyzed for
<br /> TPHg by EPA Method 8015M and for BTEX, MTBE and other oxygenates by EPA Method
<br /> 8021B A historical summary of hydrocarbons removed by vapor extraction is presented in
<br /> Table 3, and individual well vapor concentrations are included in Table 4 Due to the system
<br /> being down, vapor samples were not collected after April 11, 2005 The analytical results for the
<br /> vapor samples are provided in Appendix D
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