; (B) merged with amounts in the fund or account to which the amounts were credited under subparagraph (A); and (C) available for the same purposes as, and subject to the same conditions and limitations applicable to, amounts in the fund or account to which the amounts were credited under subparagraph (A). (d) Description of Federal land and non-Federal land The exact acreage and legal description of the Federal land and non-Federal land to be exchanged under this section shall be determined by surveys that are determined to be satisfactory by the Secretary and the Post. (e) Conveyance agreement The exchange of Federal land and non-Federal land under this section shall be— (1) carried out through a quitclaim deed or other legal instrument; and (2) subject to such terms and conditions as are mutually satisfactory to the Secretary and the Post, including such additional terms and conditions as the Secretary considers to be appropriate to protect the interests of the United States. (f) Valid existing rights The exchange of Federal land and non-Federal land authorized under this section shall be subject to valid existing rights. (g) Title approval Title to the Federal land and non-Federal land to be exchanged under this section shall be in a form acceptable to the Secretary. (h) Treatment of acquired land Any non-Federal land and interests in non-Federal land acquired by the United States under this section shall be administered by the Secretary as part of the Gulf Islands National Seashore. (i) Modification of boundary On completion of the exchange of Federal land and non-Federal land under this section, the Secretary shall modify the boundary of the Gulf Islands National Seashore to reflect the exchange of Federal land and non-Federal land.