; grants to the Government of the Virgin Islands , as authorized by law; grants to the Government of Guam, as authorized by law; and grants to the Government of the Northern Mariana Islands , as authorized by law ( Public Law 94–241 ; 90 Stat. 272); and (2) $9,430,000 shall be available until September 30, 2020, for salaries and expenses of the Office of Insular Affairs: Provided , That all financial transactions of the territorial and local governments herein provided for, including such transactions of all agencies or instrumentalities established or used by such governments, may be audited by the Government Accountability Office, at its discretion, in accordance with chapter 35 of title 31, United States Code: Provided further , That Northern Mariana Islands Covenant grant funding shall be provided according to those terms of the Agreement of the Special Representatives on Future United States Financial Assistance for the Northern Mariana Islands approved by Public Law 104–134 : Provided further , That the funds for the program of operations and maintenance improvement are appropriated to institutionalize routine operations and maintenance improvement of capital infrastructure with territorial participation and cost sharing to be determined by the Secretary based on the grantee’s commitment to timely maintenance of its capital assets: Provided further , That any appropriation for disaster assistance under this heading in this Act or previous appropriations Acts may be used as non–Federal matching funds for the purpose of hazard mitigation grants provided pursuant to section 404 of the Robert T. Stafford Disaster Relief and Emergency Assistance Act ( 42 U.S.C. 5170c ). Compact of free association For grants and necessary expenses, $3,363,000, to remain available until expended, as provided for in sections 221(a)(2) and 233 of the Compact of Free Association for the Republic of Palau