Within one year after December 27, 1974, the Secretary shall submit, in writing, to the Committees on Interior and Insular Affairs and to the Committees on Appropriations of the United States Congress a detailed plan which shall indicate:

It is the express intent of the Congress that the Secretary should substantially complete the land acquisition program contemplated by this subchapter within six years after December 27, 1974.

(Pub. L. 93–555, § 3, Dec. 27, 1974, 88 Stat. 1786; Pub. L. 106–291, title I, § 149(c)(2), Oct. 11, 2000, 114 Stat. 956.)