University Human Resources
Part IV: General Rules
Trenching, Shoring and Excavation
OSHA citation 1926.650-652
- Barricade all open excavations and mark them with flashers.
- Excavated material must be shored or retained two feet or more from its edge. Banks of excavated material more than four feet high shall be shored or laid back to a stable slope. The sides of trenches in unstable or soft material of four feet or more in depth shall be shored to protect employees. If a trench is four feet deep or more, a ladder shall be provided for exit out of the ditch.
- If a cave-in or slide appears possible, necessary precautions must be taken to safeguard all employees.
- Check the excavation when a rainstorm or hazard-increasing incident occurs. Increase the amount of protection if necessary.