40 C.F.R. § 60.5371c

What requirements apply to revisions to my state or Tribal plan?

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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.