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U.S. Environmental Protection Agency

Missouri Water Science Center

Summary of the Ecological Risk Assessment for the Riverfront Superfund Site:

An Ecological Risk Assessment was conducted during 2002 for all Operable Units at the Riverfront Superfund Site. The objective of the Ecological Risk Assessment was to evaluate existing sampling data to assess the risk that contamination from the Riverfront Site poses to the environment. Surface soil, stream sediment, surface water, and vegetation sampling results were evaluated from locations (all operable units) across the Riverfront Site. Volatile organic compounds (VOCs) were the contaminants that were used to calculate the risks to the environment. The risk calculations found that contamination of the surface soils and stream sediment at the Riverfront Site does not pose any significant risks to wildlife. Surface waters in most streams on the Riverfront Site were found to pose no significant risks to the environment. However, two sample locations on a tributary of Boeuf Creek (referred to as the 500 tributary) were contaminated with tetrachloroethene (PCE) at concentrations above safe levels for wildlife. This creek is about 1,500 feet southwest of OU2, which is the probable origin of the contamination. Tree-core sampling results showed that although VOCs are present in plant tissue at many locations across the Riverfront Site, the contamination is not present at levels that would harm any herbivores. The report concluded that no further ecological studies are necessary at this time.

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