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ChemSTEER Chem ical S creening T ool for E xposures & E nvironmental R eleases

ChemSTEER Chem ical S creening T ool for E xposures & E nvironmental R eleases. Scott Prothero US EPA AIHCE May 25, 2000. What Will You Learn Today?. Background / Context Computer Requirements Premises / Methods Inputs / Outputs Applications Status / Availability.

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ChemSTEER Chem ical S creening T ool for E xposures & E nvironmental R eleases

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  1. ChemSTEERChemical Screening Tool for Exposures & Environmental Releases Scott Prothero US EPA AIHCE May 25, 2000

  2. What Will You Learn Today? Background / Context Computer Requirements Premises / Methods Inputs / Outputs Applications Status / Availability

  3. What does ChemSTEER do? In the absence of exposure data… Estimates potential inhalation, dermal exposures to workers Estimates potential releases to air, water, land ... for a chemical in industrial and commercial operations.

  4. Why Did EPA Develop ChemSTEER? • Initially developed for use in EPA New Chemicals Program risk screening process • Computerizes established methods and models • Tool for non-EPA use

  5. What Do You Need to Run ChemSTEER? • Technical info and data on chemical and operation(s) • Understanding of methods • IBM- compatible computer • 10 MB storage, 16 MB RAM • Windows 95 or newer

  6. How Do You Use ChemSTEER? • Choose Operations • Input Data on Chemical • Input Site Data and Info • Choose default models and parameters or other options

  7. What Methods Are in ChemSTEER? Current Vapor Generation Models for filling, open pools of liquid “Box Model” for Inhalation Dermal models Container/ equip. residuals Non-ideal behavior Established exposure limits Industry- specific “generic scenarios” Future

  8. What Are Some Example Inputs? Volume Handled or Produced Operation Types (Uses) Molecular Weight, Vapor Pressure Weight Fractions Numbers of Sites, Workers Release Sources/Worker Activities Ventilation Rates Container Volumes

  9. What Are Some Example Outputs? Exposures LADD & mg/day inhaled, available for absorption through skin Releases kg/day, kg/year to air, water, land, incineration

  10. What Are Its Applications? Prevent Pollution / Reduce Exposure & Risk Identify & Prioritize Process “Problems” (esp. pre-design) Examine Tradeoffs: Occupational & Non-occupational Impacts Link to E-FAST: Tool for Non-occupational Exposures beyond Plant Boundaries

  11. What is Its Status & Availability? Use now for Demos only User-defined operations only Release Goal: Summer 2000 Add industry-specific operations, methods, user manual, user friendliness, peer review in 2000-01

  12. EPA Exposure Homepage: www.epa.gov/opptintr/exposure General info on ChemSTEER and other tools related to human and environmental exposures, fate, and risks Describes the exposure assessment process Download available tools

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