Research In Support of Refined Risk Assessments To Evaluate Ecological Risk
Ingrid M. Sunzenauer and the EFED Implementation Team
On this Page
- Overview of Presentation
- Why Revise the Ecological Assessment Process?
- How Did We Begin?
- What Does This New Assessment Scheme Look Like?
- What Did We do Next?
- Where Are The Models Now?
- Highlights of the Terrestrial Model
- Terrestrial Exposure Distributions
- Example of Terrestrial Results
- Looking to the Future
- Some Research Area Ex's: Terrestrial Exposure Model
- Some Aquatic Research Area Ex's
- Proposed Approach to Address Uncertainties
- Current Efforts
- Options to Further Address Research Areas
- Next Steps
- Implementation Team
- Web Site
Overview of Presentation
Highlights of Terrestrial Refined risk Assessments Level II Model
Some Examples of Research Areas
Options to Address Research Areas
Why Revise the Ecological Assessment Process?
Provide answers to risk management questions that could not be addressed in the past --
Magnitude and probability of effects
Certainty of assessment predictions
How Did We Begin?
Formed a stakeholder workgroup (ECOFRAM, 1997)
Held peer review workshops to review recommendations (1999)
Formed EPA Implementation Team
Developed implementation plan based on 4 levels of refinement
Strongly supported by SAP (2000)
What Does This New Assessment Scheme Look Like?
Level I: Screening level assessment
Level II: Preliminary assessment of probability and magnitude of effects
Levels III and IV: More refined assessments, representing increasingly focused biological and exposure scenarios
What Did We do Next?
Developed pilot aquatic and terrestrial models to address acute risk to non- target species - Level II+
Address probability and magnitude of effects and provide a measure of uncertainty
Peer reviewed by SAP as generic case study and supported as "state-of- the-art" (2001)
Where Are The Models Now?
Finalizing Level II models, Version 2.0, based on SAP comments and own ideas
|Complete development||Dec 2002|
|Beta-test||Spring / Winter 2003|
|Sap review||July 2003|
|"Finalize" models and implement||Fall 2003|
|Continue model development|
to address repro effects, pop impacts, etc.
Highlights of the Terrestrial Model
Provides estimate of probability, magnitude, and certainty of risk
Acute mortality to generic avian species
Orally from food and water
Inhalation and dermal routes
Single treated field
At and following a single application
Inter-species variability addressed through distribution-based approach
Intra-species variability based on the D/R curve
Exposure distributions based on residue and biological variables
Effects and exposure distributions combined using Monte Carlo sampling techniques
Terrestrial Exposure Distributions
Application rate and method
Distribution of residues and degradation rate
What, how much, and where the bird eats
How much and where the bird drinks
How much the bird breathes
How much foliage the bird contacts
Example of Terrestrial Results
Looking to the Future
Research is needed to reduce the uncertainty currently associated with terrestrial and aquatic model predictions.
Some Research Area Ex's: Terrestrial Exposure Model
Dietary behavior of birds
Estimation of residues on and in insects
Use of poisoned insects as food source
Estimates of water consumption by birds from dew, puddles, streams, and other sources
Residues in drinking water sources
Crop canopy air concentrations
Dermal transfer rates and uptake
Exposure through preening
Exposure from soil ingestion
Dermal contact and inhalation
Estimates of contribution of these exposure routes
Some Aquatic Research Area Ex's
Develop exposure modeling capability to reflect environmental variability, such as soil aerobic and anaerobic half-lives
Develop and validate random curve number generator runoff model that provides a more transparent and faster computational approach
Proposed Approach to Address Uncertainties
Partner with stakeholders!
Avoid duplication of effort
Working with ORD
Funding extramural projects
Further involving Canadians
Collaborating with EUFRAM
Options to Further Address Research Areas
Establish a steering committee to track research
Develop a Cooperative Research and Development Agreement
Begin discussion with stakeholders!
|Chair||Ingrid Sunzenauer, M.S.|
|Aquatic Team||Donna Randall, M.S. (Lead)|
James Lin, Ph.D.
Tim Bargar, Ph.D.
|Terrestrial Team||Ed Fite, M.S. (Lead)|
Ed Odenkirchen, Ph.D.
|Additional Supporting Team Members||Tim Barry, Sc.D. (Office of the Administrator)|
Dirk Young, Ph.D.
Douglas Urban, M.S.
Stephanie Irene, Ph.D.
David Farrar, M.S.
|Former Team Members||Kathryn Gallagher, Ph.D. |
Les Touart, Ph.D.
|Tech Team Members|