36 CFR 14.18: Restoration and reclamation.

(a) After expiration or termination of the right-of-way permit, the permittee must restore or reclaim the permitted area to standards directed and approved by the NPS.

(b) If restoration or reclamation is not completed within a reasonable time or in accordance with a schedule established in a special use permit for the restoration and reclamation activities, the permittee will be liable to the NPS for all costs of restoring and reclaiming the permitted area undertaken by the NPS, or its contractor, to the satisfaction of the NPS. This obligation will survive the termination or expiration of a right-of-way permit.