Standard Considerations for Trench Rescue Safety and Health Topics Trenching and Excavation In Focus Hurricane Recovery Hot Topics Excavating is recognized as one of the most hazardous construction operations. OSHA recently revised Subpart P, Excavations, of 29 CFR 1926.650, 29 CFR 1926.651, and 29 CFR 1926.652 to make the standard easier to understand, permit the use of performance criteria where possible, and provide construction employers with options when classifying soil and selecting employee protection methods. The following questions link to information relevant to trenching and excavation in the workplace. Information related to the construction industry is covered by a separate topic page. What OSHA standards cover trenching and excavation? Standards | Directives What are the potential hazards and possible controls associated with trenching and excavation?