Code of Federal Regulations Title 43. Public Lands:  Interior § 43.2743.4 Patented disposal sites

(a) Upon request by or with the concurrence of the patentee, the authorized officer may renounce the reversionary interests of the United States in land conveyed on or before November 9, 1988, and rescind any portion of any patent or other instrument of conveyance inconsistent with the renunciation upon a determination that such land has been used for solid waste disposal or for any other purpose that the authorized officer determines may result in the disposal, placement, or release of any hazardous substance.

(b) If the patentee elects not to accept the renunciation of the reversionary interests, the provisions contained in §§ 2741.6 and 2741.9 shall continue to apply.