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consumption to the receptor intake model. The MEPAS human health impacts module estimates
health impacts from inhalation, ingestion, or dermal contacts as either cancer incidences or hazard
index as appropriate for the contaminant of concern.
Dredging Scenario. The dredging scenario includes the processes associated with the short-term
disturbance caused by the dredging action as well as the processes present in the no-action
alternative. Dredging impacts are limited to those associated with the loss of solids and associated
contaminants from the dredging operation. The scenario does not include the effects of the physical
disturbance or entrainment by the dredge on the organisms. The resuspended material will be
transported from the dredging site and dispersed in a plume. The size of the plume where significant
increases in contaminant concentrations occur is usually small and may not include the entire depth
of the water column. Contaminants from the resuspended material will distribute between the water
and solids phases. Solids from the resuspended material plume will settle and deposit on the bottom,
changing the contaminant concentration in the surficial sediments. Significant deposition occurs
only in the immediate vicinity of the dredge, and the effects of deposition are generally small.
The conceptual model for the dredging scenario is shown in Figure 9. The sources of the
contaminants are resuspended material, sediment, and water column. Interactions between the

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