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Jason Gunter (R7 Life Scientist)
Venessa Madden (R7 Ecological Risk Assessor)
Sediment Quality Guidelines (SQGs) Sediments at Mining Sites in Region 7
McDonald Numbers (EPA SQGs)
Chemical benchmarks developed from sediment toxicity tests.
Intended to define the concentration of contaminants associated with high or low effects on biota (MacDonald and Ingersoll 2002).
Help determine whether contaminants are present in amounts that could cause or contribute adverse effects.
Site conditions could be unique, reducing the predictive ability of SQGs.
Whenever possible, decisions regarding the management of contaminated sediments should be made using a weight of evidence approach, which includes sediment chemistry and other relevant data.
Table 1. aquatic community assessmentContingency table for assessing impacts of contaminated sediments on
aquatic life based on four separate indicators of sediment quality (Ingersoll et al., 2001)
S.C. T.T B.C. T.C. Possible Conclusions
S.C. = Sediment Chemistry T.T. = Toxicity Test B.C. = Benthic Community T.C. = Tissue Chemistry