Remedial investigation/feasibility study risk assessments at a superfund mixed waste site

This paper presents lessons learned during EPA and DOE review of RI/FS risk assessments for the Fernald Environmental Management Project (FEMP). It was found that various sensitive issues are difficult to resolve and have the potential to slow down the approval of all RI/FS documents. Some of the major sensitive topics are: background contaminant concentrations; fate and transport model, parameters; sensitive subpopulations; future land use; institutional controls; radiation slope factors; additive tonic effects; basis for remediation goals. The topics are presented along with the current status of their resolution