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The objective of this study is to assess the fate, bioavailability and transport of metals and metalloids in dredge spoils applied to wetlands. Specifically, we will examine six of the Chesapeake Bay Program Toxics of Concern (Cu, Pb, Cd, Cr, Hg, As) in a restored marsh that has previously received dredge spoils (Kenilworth Marsh) and in a control marsh (Dueling Creek) within the Anacostia River. We will also examine two metals that serve as models for particular modes of redox cycling (Fe, Mn).