In order to assure that the policies of the National Environmental Policy Act of 1969 [42 U.S.C. 4321 et seq.] and other provisions of law which further the purposes of such Act (as specified in regulations issued by the Secretary) are most effectively implemented in connection with the expenditure of funds under this subchapter, and to assure to the public undiminished protection of the environment, the Secretary may, under such regulations, in lieu of the environmental protection procedures otherwise applicable, provide for the release of funds for projects or activities under this subchapter, as specified by the Secretary upon the request of a public housing agency under this section, if the State or unit of general local government, as designated by the Secretary in accordance with regulations, assumes all of the responsibilities for environmental review, decisionmaking, and action pursuant to such Act, and such other provisions of law as the regulations of the Secretary may specify, which would otherwise apply to the Secretary with respect to the release of funds.