the enactment of this Act. V DEPARTMENT OF HOMELAND SECURITY SECURITY, ENFORCEMENT, AND INVESTIGATIONS Coast guard OPERATIONS AND SUPPORT For an additional amount for Operations and Support for necessary expenses related to the consequences of Hurricanes Michael, Florence, and Lane, Tropical Storm Gordon, and Typhoon Mangkhut, $46,977,000, to remain available until September 30, 2020: Provided , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. PROCUREMENT, CONSTRUCTION, AND IMPROVEMENTS For an additional amount for Procurement, Construction, and Improvements for necessary expenses related to the consequences of Hurricanes Michael, Florence, and Lane, Tropical Storm Gordon, and Typhoon Mangkhut, $476,755,000, to remain available until September 30, 2023: Provided , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. ENVIRONMENTAL COMPLIANCE AND RESTORATION For an additional amount for Environmental Compliance and Restoration for necessary expenses related to the consequences of Hurricanes Michael and Florence, $2,000,000, to remain available until September 30, 2023: Provided , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. GENERAL PROVISIONS—THIS TITLE 501. (a) In General The Federal share of assistance provided for DR–4336–PR, DR–4339–PR, DR–4340–USVI and DR–4335–USVI under sections 403, 406 and 407 of the Robert T. Stafford Disaster Relief and Emergency Assistance Act ( 42 U.S.C. 5170b and 5173) shall be 100 percent of the eligible costs under such sections. (b) Applicability The Federal share provided by subsection (a) shall apply to disaster assistance applied for before, on, or after the date of