CFR›Title 10›Chapter II›Part 503›Subpart C ContainsSections 503.20–503.25CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart C—Temporary Exemptions for New Facilities Sections 503.20 § 503.20 Purpose and scope. 503.21 § 503.21 Lack of alternate fuel supply. 503.22 § 503.22 Site limitations. 503.23 § 503.23 Inability to comply with applicable environmental requirements. 503.24 § 503.24 Future use of synthetic fuels. 503.25 § 503.25 Public interest. Previous B Subpart B—General Requirements for Exemptions Next D Subpart D—Permanent Exemptions for New Facilities