40 CFR 257.4 : Protection Of Environment (§ 1.1 To Parts 1851-1899) — (§ 190.01 To Part 259) — Environmental Protection Agency (Continued) (§ 190.01 To Part 259) — Solid Wastes (§ 239.1 To Part 259) — Criteria For Classification Of Solid Waste Disposal Facilities And Practices (§ 257.1 To Appendix Iv To Part 257) — Classification Of Solid Waste Disposal Facilities And Practices (§ 257.1 To § 257.4) — Effective date.