; (ii) to improve the cost-effectiveness of the delivery of Colorado River water; and (iii) to ensure that the Hualapai Water Project will be constructed using only the amounts made available pursuant to subsection (b)(6). (4) Applicability of ISDEAA On request of the Hualapai Tribe and in accordance with the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5301 et seq.), the Secretary shall enter into one or more agreements with the Hualapai Tribe to carry out this subsection. (5) Operation and maintenance (A) In general In accordance with subsection (c) and subject to the availability of appropriations, during the period beginning on the enforceability date and ending on the date on which title to the Hualapai Water Project is transferred to the Hualapai Tribe pursuant to paragraph (6), the Secretary, acting through the Commissioner, in consultation with the Hualapai Tribe, shall operate, maintain, and replace the Hualapai Water Project. (B) Authorization of appropriations (i) In general There is authorized to be appropriated to the Secretary to carry out the activities described in subparagraph (A) $5,000,000, to remain available until expended. (ii) Unexpended funds Any funds that remain unexpended on the date on which title to the Hualapai Water Project is transferred to the Hualapai Tribe pursuant to paragraph (6) shall revert to the Treasury. (iii) Prohibition The Secretary shall not use any amounts from the Hualapai Water Project Account or the Hualapai OM&R Trust Account to carry out the activities described in subparagraph (A). (6) Title to Hualapai Water Project (A) In general The Secretary shall convey to the Hualapai Tribe title to the Hualapai Water Project on the date on which the Secretary issues a notice including— (i) a certification that the infrastructure constructed is capable of storing, diverting, treating, transmitting, and distributing a supply of water as generally set forth in the final project design described in paragraph (3)