CFR›Title 40›Chapter I›Part 51›Subpart F ContainsSections 51.100–51.105CorpusDaily eCFRDisplayed edition2026-05-18Last updated2026-05-18 Subpart F—Procedural Requirements Sections 51.100 § 51.100 Definitions. 51.101 § 51.101 Stipulations. 51.102 § 51.102 Public hearings. 51.103 § 51.103 Submission of plans, preliminary review of plans. 51.104 § 51.104 Revisions. 51.105 § 51.105 Approval of plans. Authority42 U.S.C. 7401, 7411, 7412, 7413, 7414, 7470-7479, 7501-7508, 7601, and 7602. Previous DD Subpart DD-Requirements for Reclassified Ozone Nonattainment Areas Next G Subpart G—Control Strategy