CFR›Title 40›Chapter I›Part 239›Subpart D ContainsSections 239.10–239.13CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart D—Adequacy Determination Procedures Sections 239.10 § 239.10 Criteria and procedures for making adequacy determinations. 239.11 § 239.11 Approval procedures for partial approval. 239.12 § 239.12 Modifications of state programs. 239.13 § 239.13 Criteria and procedures for withdrawal of determination of adequacy. Previous C Subpart C—Requirements for Adequate Permit Programs