CFR›Title 30›Chapter I›Part 57›Subpart B›Subject Group Precautions—Surface and Underground ContainsSections 57.3400–57.3401CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Sections 57.3400 § 57.3400 Secondary breakage. 57.3401 § 57.3401 Examination of ground conditions. Previous 57.3000 § 57.3000 Definitions. Next Precautions—Surface Only Precautions—Surface Only