A risk-based approach is used to evaluate potential human health risks associated with a discharge from an ash disposal site into a small stream.
The RIVRISK model was used to estimate downstream concentrations and corresponding risks.
The modeling and risk analyses focus on boron, the constituent of greatest potential concern to public health at the site investigated, in Riddle Run, Pennsylvania.
Prior to performing the risk assessment, the model is validated by comparing observed and predicted results.
The comparison is good and an uncertainty analysis is provided to explain the comparison.
The hazard quotient (HQ) for boron is predicted to be greater than 1 at presently regulated compliance points over a range of flow rates.
The reference dose (RfD) currently recommended by the United States Environmental Protection Agency (U.S. EPA) was used for the analyses.
However, the toxicity of boron as expressed by the RfD is now under review by both the U.S. EPA and the World Health Organization.
Alternative reference doses being examined would produce predicted boron hazard quotients of less than 1 at nearly all flow conditions.
Mots-clés Pascal : Pennsylvanie, Etats Unis, Amérique du Nord, Amérique, Pollution eau, Eau surface, Cours eau, Lessivat, Décharge déchet, Cendre, Devenir polluant, Phénomène transport, Bore, Modélisation, Analyse risque, Toxicité
Mots-clés Pascal anglais : Pennsylvania, United States, North America, America, Water pollution, Surface water, Stream, Leachate, Waste dumping, Ash, Pollutant behavior, Transport process, Boron, Modeling, Risk analysis, Toxicity
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0202585
Code Inist : 001D16A04C. Création : 16/11/1999.