pay and premium pay may not be paid under this section to any individual during a calendar year so as to result in a total rate in excess of the rate of basic pay for level V of the Executive Schedule (section 5316 of such title). IV Independent agencies Appalachian regional commission For expenses necessary to carry out the programs authorized by the Appalachian Regional Development Act of 1965, and for expenses necessary for the Federal Co-Chairman and the Alternate on the Appalachian Regional Commission, for payment of the Federal share of the administrative expenses of the Commission, including services as authorized by section 3109 of title 5, United States Code, and hire of passenger motor vehicles, $170,000,000, to remain available until expended. Defense nuclear facilities safety board Salaries and expenses For expenses necessary for the Defense Nuclear Facilities Safety Board in carrying out activities authorized by the Atomic Energy Act of 1954, as amended by Public Law 100–456 , section 1441, $31,000,000, to remain available until September 30, 2021. Delta regional authority Salaries and expenses For expenses necessary for the Delta Regional Authority and to carry out its activities, as authorized by the Delta Regional Authority Act of 2000, $15,000,000, to remain available until expended. Denali commission For expenses necessary for the Denali Commission including the purchase, construction, and acquisition of plant and capital equipment as necessary and other expenses, $15,000,000, to remain available until expended, notwithstanding the limitations contained in section 306(g) of the Denali Commission Act of 1998: Provided , That funds shall be available for construction projects in an amount not to exceed 80 percent of total project cost for distressed communities, as defined by section 307 of the Denali Commission Act of 1998 (division C, title III, Public Law 105–277 ), as amended by section 701 of appendix D, title VII, Public Law 106–113 (113 Stat. 1501A–280), and an amount not to exceed 50