CFR›Title 40›Chapter I›Part 261›Appendix Appendix IV to Part 261 [Reserved for Radioactive Waste Test Methods] CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Appendix IV to Part 261 [Reserved for Radioactive Waste Test Methods] Previous Appendix I to Part 261 Appendix I to Part 261—Representative Sampling Methods Next Appendix IX to Part 261 Appendix IX to Part 261—Wastes Excluded Under §§ 260.20 and 260.22