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ChemSTEERChemical Screening Tool for Exposures & Environmental
Releases
Scott Prothero
US EPA
AIHCE
May 25, 2000
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What Will You Learn Today?
Background / Context Computer Requirements Premises / Methods Inputs / Outputs Applications Status / Availability
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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.
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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
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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
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How Do You Use ChemSTEER?
Choose Operations
Input Data on Chemical
Input Site Data and Info
Choose default models and parameters or other options
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What Methods Are in ChemSTEER? 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”
Current
Future
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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
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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
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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
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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
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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