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significantly contaminated in the future. If possible, significance of contamination should be based on the results of an assessment that compares screening of measured contaminant concentrations against ecotoxicological benchmarks and background concentrations.
Alternatively, modeled concentrations may be screened in the same way. In the absence of measured or modeled concentrations, expert judgment should be conservatively applied. A medium should be included in the model if any chemical in the medium is retained by the screening process or any chemical is judged to potentially be present at significant concentrations.
In
some cases, the contaminated medium is also the waste (i.e., the source of the contaminant chemicals). This would also be the case for any waste sumps that are treated as receptor ecosystems rather than as sources. In such cases, the source box is
simply combined with the soil, water, or sediment box.
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