; 30 U.S.C. 21 et seq.) shall be appraised in accordance with standard appraisal practices, including, as appropriate, the Uniform Appraisal Standards for Federal Land Acquisition. (7) Duration An appraisal conducted under paragraph (1) shall remain valid for 3 years after the date on which the appraisal is approved by the Secretary and the State. (b) Equalization (1) Surplus of Federal land If the final appraised value of the Federal land exceeds the final appraised value of the non-Federal land to be exchanged under this title, the value of the Federal land and non-Federal land shall be equalized— (A) by conveying additional non-Federal land in the State to the Secretary, subject to the approval of the Secretary; or (B) by using a combination of the methods described in paragraphs (2) and (3). (2) Surplus of non-Federal land If the final appraised value of the non-Federal land exceeds the final appraised value of the Federal land to be exchanged under this title, the value of the Federal land and non-Federal land shall be equalized by the State adjusting the acreage of the non-Federal land to be conveyed (3) Amount of payment Notwithstanding section 206(b) of the Federal Land Policy and Management Act of 1976 ( 43 U.S.C. 1716(b) ), the Secretary may accept a payment under paragraph (1) in excess of 25 percent of the value of the Federal land conveyed.