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Risk Assessment

Freshwater Sediment Screening Benchmarks

Hierarchy for Selection of Freshwater Sediment Benchmarks

  • Preference was given to benchmarks based on chronic direct exposure, non-lethal endpoint studies designed to be protective of sensitive species
  • Values derived by statistical- or consensus-based evaluation of multiple studies were given first priority
  • Equilibrium partitioning values were selected for contaminants with 2.0< log Kow <6.0 if empirical values based on multiple studies were not available
  • Absent consensus or equilibrium partitioning values, single study toxicity values were selected
  • Marine values were used for freshwater only if a suitable freshwater value did not exist

Author: Bruce Pluta (Region 3)
Date: August 2006
Description: Screening benchmarks for freshwater sediment in Region 3
Keywords: freshwater, sediment, screening benchmarks, risk assessment, Superfund, Region 3, water, ERAGS, SLERA


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