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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
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