Cook, R. B.. Oak Ridge National Laboratory, cookrb@ornl.gov
Suter, G. B.. Environmental Protection Agency, SUTER.GLENN@epamail.epa.gov
Sample, B. E.. Oak Ridge National Laboratory, samplebe@ornl.gov
Jones, D. S.. Oak Ridge National Laboratory, jonesds@ornl.gov
Efroymson, R. A.. Oak Ridge National Laboratory, efroymsonra@ornl.gov

 
WEIGHING MULTIPLE LINES OF EVIDENCE TO ASSESS RISKS IN A RIVER-RESERVOIR ECOSYSTEM
 
The U.S. Department of Energy recently completed a remedial investigation of the Watts Bar Reservoir and Clinch River Superfund Site. This site, located in eastern Tennessee near Oak Ridge, consists of 70 river kilometers and 40 km2 of surface area. The purpose of this investigation was to evaluate the nature and extent of contamination, perform ecological and human health risk assessments, and evaluate possible remedial alternatives. The ecological risk assessment was conducted for fish, piscivorous and insectivorous wildlife, and benthic invertebrate communities. Measures of exposure and effects included biological surveys, reproductive success, media toxicity, tissue concentrations, media concentrations, population models, and biological indicators of stress. The risk characterization for each assessment endpoint was performed by evaluating each line of evidence separately and then weighing the evidence using an ecoepidemological approach. The assessment represents a difficult problem in risk characterization because there were no clearly affected areas, no contaminants occurred at clearly toxic levels, and there were no suitable uncontaminated upstream reaches to serve as references.
 
Day: Friday, Feb. 5
Time: 09:00 - 09:15am
Location: Hilton of Santa Fe
 
Code: SS11FR0900H