; or (ii) the date that is 5 years after the date of enactment of the Rich Hole and Rough Mountain Wilderness Additions Act. (B) Management Except as provided in subparagraph (C), the Secretary shall manage the wilderness area designated under subparagraph (A) in accordance with the Wilderness Act ( 16 U.S.C. 1131 et seq.). (C) Water quality improvement activities (i) In general To enhance natural ecosystems within the Rich Hole Addition by implementing certain activities to improve water quality and aquatic passage, as set forth in the Forest Service document entitled Decision Notice for the Lower Cowpasture Restoration and Management Project and dated December 2015, the Secretary of Agriculture may use motorized equipment and mechanized transport in the Rich Hole Addition under subparagraph (A) until the date on which the Rich Hole Addition is incorporated into the Rich Hole Wilderness under that subparagraph. (ii) Requirement In carrying out clause (i), the Secretary of Agriculture, to the maximum extent practicable, shall use the minimum tool or administrative practice necessary to carry out that clause with the least amount of adverse impact on wilderness character and resources. .