; for conducting detailed studies, and plans and specifications, of such projects (including those involving participation by States, local governments, or private groups) authorized or made eligible for selection by law (but such detailed studies, and plans and specifications, shall not constitute a commitment of the Government to construction); $2,323,000,000, to remain available until expended; of which such sums as are necessary to cover the Federal share of construction costs for facilities under the Dredged Material Disposal Facilities program shall be derived from the Harbor Maintenance Trust Fund as authorized by Public Law 104–303