; or (iii) the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.). (h) Payment of costs of conveyance (1) Payment of costs required The Director concerned or the Regional Forester concerned shall require the purchaser to cover the costs to be incurred, or to reimburse the Director concerned or the Regional Forester concerned for costs incurred, to carry out the conveyance, including survey and appraisal costs, costs for environmental documentation, and any other administrative costs related to the conveyance. (2) Refund of excess If amounts are collected from the purchaser in advance of the Director concerned or the Regional Forester concerned incurring the actual costs, and the amount collected exceeds the costs actually incurred by the Director concerned or the Regional Forester concerned to carry out the conveyance, the Director concerned or the Regional Forester concerned shall refund the excess amount to the purchaser. (3) Treatment of amounts received Amounts received as reimbursement under paragraph (1) shall be credited to the fund or account that was used to cover those costs in carrying out the conveyance. Amounts so credited shall be merged with amounts in such fund or account, and shall be available for the same purposes, and subject to the same conditions and limitations, as amounts in such fund or account. (i) Time for conveyance It is the intent of the Congress that the conveyance of an eligible Federal lands parcel under this section, from selection of the parcel for conveyance through completion of the sale, should take no more than 18 months. (j) Categorical exclusion Because the scope of a conveyance is limited and excluded from any exceptional resource, a conveyance of an eligible Federal lands parcel under this section is categorically excluded from the requirement to prepare an environmental assessment or an environmental impact statement under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.). (k) Additional authority The conveyance authority provided