Work involves physical exertion and agility while performing duties such as heavy lifting (i.e., hay bales weighing in excess of 100 pounds, unloading and carrying portable panels, steel fence posts, jute, other materials, and equipment), bending, walking, standing, operating of trucks, coupling, and uncoupling of trailers and working with other equipment (e.g., torches for welding). The Department of the Interior protects and manages the Nation''s natural resources and cultural heritage; provides scientific and other information about those resources; and honors its trust responsibilities or special commitments to American Indians, Alaska Natives, Native Hawaiians, and affiliated Island Communities.