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42 U.S.C. 7401 et seq.
36 FR 24877, Dec. 23, 1971, unless otherwise noted.
89 FR 17140, Mar. 8, 2024, unless otherwise noted.
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(a) Any significant revision to a state or Tribal plan shall be adopted and submitted as specified in § 60.28a.
(b) A revision of a plan, or any portion thereof, shall not be considered part of an applicable plan until approved by the Administrator in accordance with this subpart and subpart Ba of this part.