Calculating Cleanup Levels With Monte Carlo: Regulatory Concerns and Perspective. T. W. Simon, US EPA Region 4, Atlanta, GA
EPA recognizes two methods for determining cleanup levels from Monte Carlo risk assessments - backcalculation and iterative truncation. In spite of the controversy with backcalculation methods that is the subject of this symposium, these methods are useful for finding a starting point for the iterative truncation method. EPA would not wish to see a cleanup level developed with a probabilistic risk assessment based solely on the backcalculation method. From a regulatory perspective, a significant advantage of the iterative truncation method is that both average cleanup levels and not-to-exceed cleanup levels can be developed. With both these levels, risk managers can be certain that the site average level will be protective of chronic health effects and the not-to-exceed level will not present acute toxicity.
This work does not represent the policies of the EPA or any other agency of the Federal Government.
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