Environmental, Health and Safety Services

Is distance alone (from a vertical wall of an excavation) adequate protection from cave-in?

Yes, provided that personnel are at least two times the height of the vertical wall from the wall.  Personnel entering the excavation must be instructed not to enter the “danger zone” and a warning system, such as roping off the area or marking it with cones, flags, or other highly visible means must be provided to prevent workers from entering the zone inadvertently.