Trust Fund are authorized to be used in accordance with paragraph (3). (7) Availability Any amount authorized to be appropriated to the Jicarilla Apache Nation Operations, Maintenance, and Replacement Trust Fund under paragraph (4) shall not be available for expenditure or withdrawal until the Jicarilla Apache Nation is responsible for payment of operation, maintenance, and replacement costs as set forth in section 10603(g). (8) Fluctuation in costs (A) In general The amounts authorized to be appropriated under paragraph (4) shall be increased or decreased, as appropriate, by such amounts as may be justified by reason of ordinary fluctuations in costs occurring after October 2022 as indicated by the Bureau of Reclamation Operation and Maintenance Cost Index. (B) Repetition The adjustment process under this subparagraph shall be repeated for each subsequent amount appropriated until the amount authorized, as adjusted, has been appropriated. (C) Period of indexing The period of indexing adjustment under this subparagraph for any increment of funding shall end on the date on which the funds are deposited into the Jicarilla Apache Nation Operations, Maintenance, and Replacement Trust Fund. (9) Management The Secretary shall manage the Jicarilla Apache Nation Operations, Maintenance, and Replacement Trust Fund in accordance with subsection (d). (10) Conditions for expenditure and withdrawal All expenditures and withdrawals by the Jicarilla Apache Nation of funds in the Jicarilla Apache Nation Operations, Maintenance, and Replacement Trust Fund must comply with the requirements of subsection (f). (d) Management The Secretary shall manage the Settlement Trust Funds, invest amounts in the Settlement Trust Funds pursuant to subsection (e), and make amounts available from the Settlement Trust Funds for distribution to the Nation and the Jicarilla Apache Nation in accordance with the American Indian Trust Fund Management Reform Act of 1994 ( 25 U.S.C. 4001 et seq. ). (e) Investment of the trust funds The Secretary shall