An NSO shall be amended within three months of submission of any report required under § 57.504 so as to require additional fugitive emission control measures if such report establishes that such additional measures are necessary to assure that the NAAQS will be maintained with a reasonable degree of reliability.
source: 50 FR 6448, Feb. 15, 1985, unless otherwise noted.
cite as: 40 CFR 57.505