; or (ii) planning, design, or construction was initiated before the date of enactment of this Act, but for which no funds, Federal or non-Federal, were obligated for planning, design, or construction of the project or separable element of the project during the current fiscal year or any of the 10 preceding fiscal years. (B) Use of comprehensive construction backlog and operation and maintenance report The Secretary may develop the preliminary list from the comprehensive construction backlog and operation and maintenance reports developed pursuant to section 1001(b)(2) of the Water Resources Development Act of 1986 ( 33 U.S.C. 579a ). (2) Preparation of proposed deauthorization list (A) Deauthorization amount The Secretary shall prepare a proposed list of projects for deauthorization comprised of a subset of projects and separable elements identified on the preliminary list developed under paragraph (1) that have, in the aggregate, an estimated Federal cost to complete that is at least $10,000,000,000. (B) Determination of Federal cost to complete For purposes of subparagraph (A), the Federal cost to complete shall take into account any allowances authorized by section 902 of the Water Resources Development Act of 1986 ( 33 U.S.C. 2280 ), as applied to the most recent project schedule and cost estimate. (C) Inclusion of deauthorization of antiquated projects The Secretary shall reduce the amount identified for deauthorization under paragraph (2)(A) by an amount equivalent to the estimated current value of each project, or separable element of a project, that is deauthorized by subsection (f). (3) Sequencing of projects (A) In general The Secretary shall identify projects and separable elements for inclusion on the proposed list of projects for deauthorization under paragraph (2) according to the order in which the projects and separable elements were authorized, beginning with the earliest authorized projects and separable elements and ending with the latest project or separable element necessary to meet the