Five-Foot Trench, No Competent Person, and a Foreman in a Hurry
A four-person crew is installing 30-inch storm drain in a 5-foot-deep, 30-inch-wide trench cut through sandy silt. It rained the night before and water is seeping into the trench bottom. The excavator is stockpiling spoil about 2 feet back from the trench edge, and the pile is roughly 4 feet high. The nearest ladder is 30 feet down the run. A backhoe is working 8 feet away and swinging its bucket over the trench. The crew's competent person left the site at noon for another job. The foreman tells the newest worker to "hop in and hand-shovel the bell end before the water gets worse." It is 94°F and the worker has been on site since 6 a.m.
1. List the conditions that make entry unsafe right now, and state what must happen before anyone goes into the trench.
Read the worked answer
Stop the work and keep everyone out. Each condition below is a separate reason, not a detail:
- Depth (5 ft). At 5 feet, a protective system - sloping, benching, shoring, or a trench box - is required unless a competent person has classified the soil as stable rock. Sandy silt is not stable rock.
- Water. Seepage after rain means the soil is saturated and the walls can slump without warning. The trench must be dewatered and re-inspected.
- Spoil pile. Two feet from the edge is only the bare minimum setback; a 4-foot-high pile that close surcharges the wall and can roll back in. Move it back and keep it low.
- Access/egress. A ladder is required within 25 feet of lateral travel for anyone in a trench 4 feet or deeper. This one is 30 feet away.
- No competent person on site. No one is qualified to inspect the excavation, classify the soil, or approve entry. Until a competent person inspects and authorizes entry, entry is prohibited.
- Equipment. The backhoe is swinging over an occupied trench; nobody enters a swing radius.
The answer is not "enter carefully" - it is "do not enter."
2. The foreman repeats the order and says the job will not wait. What should the worker do, and what protections apply?
Read the worked answer
The worker should decline, clearly and in front of a witness, and escalate.
- Refuse the entry. Stepping into an unprotected 5-foot trench with saturated walls is an imminent-danger situation. No schedule pressure converts that into a safe task.
- Escalate up the chain, not sideways. Notify the superintendent and the company safety representative, and ask that the competent person be brought back or another one designated. Also stop the rest of the crew - if the foreman will order one worker in, he will order another.
- Know the protection. Employers must provide a workplace free of recognized hazards, and workers who in good faith refuse to perform a task they reasonably believe is imminently dangerous are protected from retaliation; that protection extends to reporting the hazard to a regulator. This is the legal backing for the refusal, not a reason to argue about it in the trench.
- Document. Note the time, the conditions, who gave the order, and who was notified. If the foreman overrides the refusal and someone is injured, that record matters.
A worker who enters because a supervisor insisted has not been protected - the hazard has simply been accepted.
3. Suppose the competent person returns, classifies the soil, and authorizes entry. What controls would you expect to see before the crew goes back in?
Read the worked answer
Authorization is the start of the controls, not the end of them. Expect:
- A protective system in place and inspected - sloping or benching to the angle the competent person specifies for that soil, or a properly installed trench box, with the box set so the top is above the trench lip.
- Dewatering - a pump running, with the discharge routed away from the trench so it does not run back in or undercut the walls.
- Spoil relocated - well back from the lip (not at the 2-foot minimum) and kept low so it cannot surcharge the wall.
- Access at both ends of the work area - a ladder within 25 feet of lateral travel, secured and extending 3 feet above the top of the trench.
- Traffic and swing control - the excavator's swing radius barricaded or a spotter assigned, and no worker under a suspended load.
- Re-inspection - after rain, after any wall movement, and at the start of each shift; a trench that was fine at 7 a.m. may not be at 1 p.m.
- Heat controls - shade, water, and rotation, since the worker has been out since 6 a.m. in 94°F.
The competent person's authorization is time-stamped to those conditions, not to the rest of the day.