Trenching and Excavation Hazards
Trenching and excavation work presents significant hazards to all workers involved. Cave-ins are the most dangerous and are more likely than many other excavation-related incidents to cause fatalities. To illustrate the severity, one cubic yard of soil can weigh as much as a car.
Employers must ensure that workers enter trenches only after adequate protections are in place to prevent cave-ins.
Other Potential Hazards in Trenching Work Include:
- Falling Loads: Materials or equipment can fall into the excavation, posing a risk of injury.
- Hazardous Atmospheres: Toxic gases, low oxygen levels, or other harmful conditions may be present.
- Mobile Equipment Hazards: Excavators, forklifts, and other equipment operating near trenches can create additional risks.
All safety measures should be actively addressed to protect workers from these hazards before, during, and after excavation activities.
Excavation vs. Trench
An excavation is any man-made cut, cavity, or depression in the ground, and it can vary in size—wide, narrow, deep, or shallow.
A trench is a type of excavation that is narrow, typically 15 feet or less in width at the bottom. If forms or other structures reduce the width of an excavation to less than 15 feet at the bottom, it is also classified as a trench.
Cave-In Protection Requirements:
- Workers in excavations 5 feet deep or deeper must be protected from cave-ins.
- If a competent person trained in soil analysis determines that a cave-in hazard exists, protection is required regardless of the excavation’s depth.