Easement; quiet title; cloud upon title; Federal Energy Regulatory Commission License; FERC license; fee simple; contract; easement agreement; easement appurtenant; easement in gross; excessive use; Restatement of Property; third-party property rights; interlocutory appeal; summary judgment; scope of authority under easement; eminent domain; navigability; navigable waters; navigable-in-fact; riparian rights; public trust doctrine; artificial waters