EPA, , lead exposures were evaluated for one population only, the child recreators, exposed to lead through incidental ingestion of sediment. OE I 1 16 9 70 3 3E-I0 4. The RME scenario is defined as the highest exposure that could reasonably be expected to occur for a given exposure pathway at a site, and accounts for both uncertainty in the contaminant concentration and variability in the exposure parameters. More detailed calculation results are presented in Appendix D. Because of differences between the exposures that are the basis for these criteria and exposures evaluated in this HHRA, these criteria may under- or overestimate, but most likely overestimate, actual risks to people from exposure to lower concentrations in environmental media. For several chemicals detected in sediment, appropriate surrogate values were not identified; consequently, these chemicals could not be quantitatively evaluated in the HHRA. The HHRA indicates that fish consumption is the primary pathway for contaminant exposure in the Lower Ottawa River and for potential adverse health effects, and that PCBs are the primary contaminant of concern in fish. A typical or average level of a chemical in the environment.
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