shall be allocated for this fiscal year, excluding the amount of any fees appropriated, not less than the amount of appropriations for that program project for fiscal year 2014. Hazardous Waste Electronic Manifest System Fund For necessary expenses to carry out section 3024 of the Solid Waste Disposal Act ( 42 U.S.C. 6939g ), including the development, operation, maintenance, and upgrading of the hazardous waste electronic manifest system established by such section, $8,000,000, to remain available until expended: Provided , That the sum herein appropriated from the general fund shall be reduced as offsetting collections under such section 3024 are received during fiscal year 2020, which shall remain available until expended and be used for necessary expenses in this appropriation, so as to result in a final fiscal year 2020 appropriation from the general fund estimated at not more than $0: Provided further , That to the extent such offsetting collections received in fiscal year 2020 exceed $8,000,000, those excess amounts shall remain available until expended and be used for necessary expenses in this appropriation. Office of inspector general For necessary expenses of the Office of Inspector General in carrying out the provisions of the Inspector General Act of 1978, $48,514,000, to remain available until September 30, 2021. Buildings and facilities For construction, repair, improvement, extension, alteration, and purchase of fixed equipment or facilities of, or for use by, the Environmental Protection Agency, $39,553,000, to remain available until expended. Hazardous substance superfund (including transfers of funds) For necessary expenses to carry out the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), including sections 111(c)(3), (c)(5), (c)(6), and (e)(4) ( 42 U.S.C. 9611 ), and hire, maintenance, and operation of aircraft, $1,214,648,000, to remain available until expended, consisting of such sums as are available in the Trust Fund on September 30, 2019, as