The U.S. Army Corps of Engineers Research and Development Center recently completed an innovative 2-year, multiphase study tracking the residency of the common carp and determining if tagged carp could help assess where polychlorinated biphenyls (PCBs) exposure areas are within the area of concern (AOC) in the Manistique River and Harbor, near Manistique, Michigan. This study was conducted because despite sediment remediation from 1995-2000 and navigational dredging in 2010, PCB concentrations in fish remain elevated.