; (B) to improve management of inherently governmental functions through enhanced communication; and (C) to seek additional ways to reduce overall costs for the Hualapai Water Project. (9) Authorization to construct (A) In general Subject to subparagraph (B), beginning on the day after the enforceability date, the Secretary may construct the Hualapai Water Project. (B) Preconstruction activities (i) In general Notwithstanding subparagraph (A) and subject to clause (ii), on or before the enforceability date, the Secretary may use not more than $15,233,000 of the amounts deposited in the Hualapai Water Project Account under subsection (b)(6) to carry out, for the Hualapai Water Project— (I) preconstruction activities; and (II) necessary environmental studies. (ii) Fluctuation in costs The amount described in clause (i) shall be increased or decreased, as appropriate, by such amounts as may be justified by reason of fluctuations in applicable engineering cost indices occurring after February 29, 2016. (b) Hualapai Water Project Account (1) Establishment (A) In general There is established in the Treasury of the United States an account, to be known as the Hualapai Water Project Account , for use in constructing the Hualapai Water Project. (B) Administration The Hualapai Water Project Account shall be administered by the Secretary. (C) Composition The Hualapai Water Project Account shall consist of the amounts deposited in the account under paragraph (6), together with any interest accrued on those amounts. (2) Management (A) In general The Secretary shall manage the Hualapai Water Project Account in a manner that is consistent with— (i) the American Indian Trust Fund Management Reform Act of 1994 ( 25 U.S.C. 4001 et seq.); and (ii) this subsection. (B) Investments The Secretary shall invest amounts in the Hualapai Water Project Account in accordance with— (i) the Act of April 1, 1880 (21 Stat. 70, chapter 41; 25 U.S.C. 161 ); (ii) the first section of the Act of June 24, 1938 (52 Stat. 1037, chapter 648