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EPA Presentation to Moffett RAB on TCE July 17, 2008

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Steve Williams
Steve Williams

EPA presentation to the Moffett Field Restoration Advisory Board on July 17, 2008, regarding TCE.

TechnologyHealth & Medicine
1 of 17
TCE Update Former NAS Moffett Field Restoration Advisory Board Meeting July 17, 2008 Stan Smucker - Toxicologist U.S. EPA Region 9
Tonight’s Topics ,[object Object],[object Object],[object Object]
What is TCE? ,[object Object]
TCE - Current EPA Practices ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],TCE Toxicity Assessment Update
What Type of Adverse Health Effects are Associated with TCE? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Non-Cancer Cancer ,[object Object],[object Object],NASA Graphic Interaction with HAP
TCE Exposure Guidelines ,[object Object],[object Object]
 
Preliminary Remediation Goal TCE in Indoor Air (Residential) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Interim Guideline = 1 ug/m 3 TCE
2008 Update to EPA Region 9 Preliminary Remediation Goals (PRG) Table ,[object Object],[object Object],[object Object]
What’s New in the 2008 PRG Table ,[object Object],[object Object],[object Object]
Impact of new EPA Inhalation Guidance on Decision-making at MEW and Moffett ,[object Object],[object Object],[object Object]
“ Old” Equation (RAGS 1989) Target Risk x Body Weight x Averaging Time x 1000 ug/mg Inhalation SF x Inhalation Rate x Exposure Frequency x Exposure Duration = 2.7 micrograms per cubic meter TCE New vs. Old PRG Equation for Indoor Workers “ New” Equation (RAGS 2008) Target Risk x Averaging Time Inhalation UR x Exposure Time x Exposure Frequency x Exposure Duration = 5.2 micrograms per cubic meter TCE
Questions / Comments?
TCE Breakdown Products in Subsurface (Anaerobic Conditions) TCE cis-1,2-DCE trans-1,2-DCE Vinyl Chloride Ethene
TCE is transformed in the atmosphere by the action of sunlight and the main degradation products are represented by dichloroacetyl chloride, formyl chloride and phosgene. Other, but less important reactions, are direct photolysis and reaction with ozone. ATSDR Tox Profile for TCE 1997 TCE Breakdown Products in Air
More Questions / Comments?

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EPA Presentation to Moffett RAB on TCE July 17, 2008

  • 1. TCE Update Former NAS Moffett Field Restoration Advisory Board Meeting July 17, 2008 Stan Smucker - Toxicologist U.S. EPA Region 9
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  • 13. “ Old” Equation (RAGS 1989) Target Risk x Body Weight x Averaging Time x 1000 ug/mg Inhalation SF x Inhalation Rate x Exposure Frequency x Exposure Duration = 2.7 micrograms per cubic meter TCE New vs. Old PRG Equation for Indoor Workers “ New” Equation (RAGS 2008) Target Risk x Averaging Time Inhalation UR x Exposure Time x Exposure Frequency x Exposure Duration = 5.2 micrograms per cubic meter TCE
  • 15. TCE Breakdown Products in Subsurface (Anaerobic Conditions) TCE cis-1,2-DCE trans-1,2-DCE Vinyl Chloride Ethene
  • 16. TCE is transformed in the atmosphere by the action of sunlight and the main degradation products are represented by dichloroacetyl chloride, formyl chloride and phosgene. Other, but less important reactions, are direct photolysis and reaction with ozone. ATSDR Tox Profile for TCE 1997 TCE Breakdown Products in Air
  • 17. More Questions / Comments?