subsection (c) and subject to valid existing rights, the Secretary shall manage each potential wilderness area designated by subsection (a) (referred to in this section as a potential wilderness area ) as wilderness until the date on which the potential wilderness area is designated as wilderness under subsection (d). (c) Ecological restoration (1) In general For purposes of ecological restoration (including the elimination of nonnative species, removal of illegal, unused, or decommissioned roads, repair of skid tracks, and any other activities necessary to restore the natural ecosystems in a potential wilderness area and consistent with paragraph (2)), the Secretary may use motorized equipment and mechanized transport in a potential wilderness area until the date on which the potential wilderness area is designated as wilderness under subsection (d). (2) Limitation To the maximum extent practicable, the Secretary shall use the minimum tool or administrative practice necessary to accomplish ecological restoration with the least amount of adverse impact on wilderness character and resources. (d) Wilderness designation A potential wilderness area shall be designated as wilderness and as a component of the National Wilderness Preservation System on the earlier of— (1) the date on which the Secretary publishes in the Federal Register notice that the conditions in the potential wilderness area that are incompatible with the Wilderness Act ( 16 U.S.C. 1131 et seq. ) have been removed