Transcript Conceptual Site Model

Ecotoxicology
1. Evaluate the current research studies in this area, are they relevant,
sufficient, and pertinent in helping TVA assess and evaluate the
environment implications of the fly ash spill?
2. Identify the major research gaps in the current monitoring and
assessment studies that apply to this particular functional workshop
area?
3. What are the major obstacles or challenges associated with each of
these identified research gaps?
4. Are all the major pathways related to implications of the ash spill to
human health currently being addressed?
5. What factors should TVA consider in its prioritization of resources to
address issues in this functional area?
Identifying and Prioritizing
Data Gaps
1. What are criteria for determining priority
data gaps?
2. What are data gaps?
3. What should we drop / what are the
technical obstacles?
4. All members of discussion group will
prioritize the data gaps.
5. Results presented today, written white
paper (due 3/26).
Criteria
• Absence or conflicting data
• Thresholds vs exposure context of existing
data
• Quality of existing data and its intended
use
• Temporal aspect of data
• Existing data represent dynamic system
• Long term versus short term effects
Criteria
• Used right animals for tests
• Matrix tested
• Quality of existing test data, relevance or
appropriateness
• Assumptions of standard bioassays
• Non-detects for existing and new data –
how handled
Group Demographics
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Academic – 6
State Agencies – 2
Federal Agencies – 4
Private Industries – 6
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Data Requirements
Top 6 Data Gaps
1.
2.
Uptake in biofilms, phytoplankton, plants
Good reference site
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3.
What contaminants of concern should move forward?
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4.
temporal, lentic/lotic, dynamic system
Need for reproductive and other sublethal endpoints
(reptiles, amphibians)
Food chain modeling – what is needed
5.
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6.
In context of other contributors to system (foundry, pulp mill,
DOE, WWTP)
Reference envelope
Dietary exposure parameters
Changes in ash over time – mixing with sediment
Notes to consider
• Need to ID process for determining data gaps, what data
do we already have? What process to determine quality?
• Database, how will it be organized, how will database be
communicated to investigators? Need for investigators to
provide data
• Don’t just focus on selenium, but know differences in how
to assess the coc’s
• Group not in a position to say what we don’t need, some
examples: tree swallows, mayfly emergence, water levels
(political realities)