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TrophicTrace is an executable program that can be used to calculate, with inputs provided by users, potential human health and ecological risks due to bioaccumulation of sediment-associated contaminants. The implemented model estimates expected concentrations in fish using a sediment-based food-web model for organic compounds, via trophic transfer factors from invertebrates to fish for certain metals, and via bioconcentration factors from water to fish for the remaining metals and hydrophilic organic compounds. Risks are calculated following USEPA and USACE risk assessment guidance (USEPA, 1989; 1997a; USEPA/USACE, 1998; Cura et al., 1999). TrophicTrace allows users to characterize the uncertainty associated with risk estimates using trapezoidal fuzzy numbers. Uncertainties can be propagated using fuzzy arithmetic principles that provide risk estimates in the form of trapezoidal fuzzy numbers. Example data sets are provided within TrophicTrace for demonstration purposes only. Use of TrophicTrace to evaluate the risks posed by a specific sediment or site must be based on appropriate, site-specific inputs.
Two items are provided for download: The TrophicTrace setup file (includes the executable and Users Manual) and a Management Guide that provides program-specific guidance to Corps dredged material managers.
Users are invited to provide feedback to the POC on any aspect of TrophicTrace and its functionality. This input will be considered during development of future updates.
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Webdate: February 5, 2003
Updated: June 30, 2006