The trustees have determined that the following natural resources have been exposed to polychlorinated biphenyls (PCB) contamination:

• Living resources, including fish, birds, mammals, amphibians, reptiles, invertebrates (insects, crabs), and plants.
• Surface water resources, including river sediments.
• Groundwater resources.
• Geologic resources, including floodplain soils.
• Air resources.

As part of the natural resource damage assessment (NRDA), the trustees have issued a damage assessment plan that provides information on the planned, current, or completed trustee-sponsored studies of natural resources exposed to PCBs.

The damage assessment plan contains three types of studies:

• Injury determination studies identify the natural resource injured by PCB exposure, how much of the resource has been injured, and the length of time the resource has been and will continue to be injured. Specific studies.

• Pathway determination studies document how PCBs move through the environment to the injured resource. Specific studies.

• Damage determination and restoration studies analyze information gathered from other studies and identify the best methods of restoring injured resources and the lost human services provided by these resources. Specific studies.