40 CFR 125.56 : Protection Of Environment (§ 1.1 To Parts 1851-1899) — (Parts 100-103 To § 135.13) — Environmental Protection Agency (Continued) (Parts 100-103 To § 135.13) — Water Programs (Parts 100-103 To § 135.13) — Criteria And Standards For The National Pollutant Discharge Elimination System (§ 125.1 To § 125.139) — Criteria For Modifying The Secondary Treatment Requirements Under Section 301(H) Of The Clean Water Act (§ 125.56 To Appendix To Subpart G Of Part 125) — Scope and purpose.