; or (II) in the case of any other covered unit, to less than 50 percent of the amount of rental charges deposited in the Account from the covered unit in a fiscal year. (C) Transfer to other covered units (i) Distribution If the Secretary determines that the percentage of amounts otherwise available to a covered unit under subparagraph (A) should be reduced under subparagraph (B), the Secretary may transfer to other covered units, for allocation in accordance with clause (ii), the percentage of the amounts withheld from the covered unit under subparagraph (B), to be expended by the other covered units in accordance with paragraph (5). (ii) Criteria In determining the allocation of amounts to be transferred under clause (i) among other covered units, the Secretary shall consider— (I) the number of proposals for ski area improvements in the other covered units; (II) any backlog in ski area permit administration or the processing of ski area proposals in the other covered units; and (III) any need for services, training, or staffing in the other covered units that would improve the administration of the Forest Service Ski Area Program. (5) Authorized expenditures (A) In general Amounts distributed from the Account to a covered unit under this subsection may be used for— (i) ski area special use permit administration and processing of proposals for ski area improvement projects in the covered unit, including— (I) upgrades to, or the replacement or installation of, passenger ropeways, including tramways, funiculars, chair lifts, conveyors, and tows; (II) snowmaking improvements and new or upgraded water facilities; (III) projects relating to buildings, structures, or other facilities owned by the ski area on National Forest System land; (IV) trail, service road, or terrain change projects