Periodically, but not less than every 4 years after the approval of any State program under section 302301 of this title, the Secretary, in consultation with the Council on the appropriate provisions of this division, and in cooperation with the State Historic Preservation Officer, shall evaluate the program to determine whether it is consistent with this division.

If, at any time, the Secretary determines that a major aspect of a State program is not consistent with this division, the Secretary shall disapprove the program and suspend in whole or in part any contracts or cooperative agreements with the State and the State Historic Preservation Officer under this division, until the program is consistent with this division, unless the Secretary determines that the program will be made consistent with this division within a reasonable period of time.

The Secretary, in consultation with State Historic Preservation Officers, shall establish oversight methods to ensure State program consistency and quality without imposing undue review burdens on State Historic Preservation Officers.