Step 4: Specify contaminants of concern (Cont.)

results. Any compound in the proposed dredged material tested under Tier III which

bioaccumulates in significantly greater amounts than a reference sediment should be

retained as a COC. Note that at the end of Tier III, the retained list of compounds

will include:

a. Contaminants for which there is no WQC.

b. Contaminants whose predicted concentrations exceed any applicable WQC.

c. Contaminants which bioaccumulate from proposed dredged materials at

concentrations significantly greater than a reference area sediments.

The product of this step is a list of contaminants of potential concern which will

be used in developing the links between contaminant sources and potential

ecological or human receptors in the conceptual model. A narrative which explains

the genesis of the list through a consideration of the results of the tiered sediment

evaluation procedures should accompany the list.

Chapter 2 Problem Formulation