4.1 Access and egress: 4 feet and 25 feet

1 The rule: 4 feet and 25 feet

1926.651(c)(2): "A stairway, ladder, ramp or other safe means of egress shall be located in trench excavations that are 4 feet (1.22 m) or more in depth so as to require no more than 25 feet (7.62 m) of lateral travel for employees."

Four things in one sentence. It applies to trench excavations. The trigger is 4 feet or more, not 5. The means may be a stairway, ladder, ramp or other safe means — the crew does not get to substitute climbing. And the measure is 25 feet of lateral travel, which is walking distance for a person in the trench, not a straight line drawn on a plan.

"Per person" is the practical reading. On a 70-foot run with one ladder in the middle, the ends are 35 feet away and the trench is out of compliance for anyone working there. Either you add ladders or you move the one you have as the crew advances.

2 Ramps and runways: 1926.651(c)(1)

Earth ramps are common and mostly unremarkable; structural ramps have design requirements, and 1926.650(b) is explicit that "ramps made of soil or rock are not considered structural ramps."

The uniform-thickness and cleats-underneath rules exist because site-built walk boards are usually two planks of different depths with a batten nailed across the top — a trip hazard on the way out of a trench, in the dark, in the rain.

3 The ladder itself still has to be a ladder

Subpart P tells you where the ladder goes. Subpart X — 1926.1053 — governs how it is built and set. Two provisions matter most in a trench:

• Extension above the landing. 1926.1053(b)(1): when portable ladders are used for access to an upper landing surface, the side rails must extend at least 3 feet above that surface; or, where the ladder's length makes that impossible, the ladder must be secured at its top to a rigid support that will not deflect, with a grasping device such as a grabrail provided.
• Secured and stable. The ladder has to be on firm footing at the bottom and secured so it cannot slide or be knocked over — a trench floor of loose spoil and pipe is not firm footing.

In a shielded trench, the ladder belongs inside the box. 1926.652(g)(1)(iii) requires employees to be protected from cave-in hazards when entering or exiting the shielded area, and a ladder outside the box means the last step of every exit is taken in unprotected ground.

4 Measuring 25 feet honestly

Lateral travel is what a person walks. In a real trench that is longer than the plan suggests, because the floor is not clear.

1. 1
   Pace the trench, do not estimate it. Twenty-five feet is roughly ten paces; walk it from the far end to the ladder.
2. 2
   Count the obstacles: pipe on the floor, a pump, a laser, a spoil ridge, the end plate of a box. Each one adds to the real travel time.
3. 3
   Check both directions from every worker — a ladder behind a bell hole they cannot cross is not 25 feet away, it is unreachable.
4. 4
   Re-check every time the crew advances, and every time the trench is extended.
5. 5
   On long runs, put in a second ladder rather than relying on someone remembering to move the first.
6. 6
   Write the ladder position on the daily inspection record; it is one of the four most-cited paragraphs in this standard.

5 Egress is also the rescue route

The reason 25 feet exists is time. A worker who sees a wall start to move has to cover that distance and climb, in soil, wearing boots, possibly with a tool in one hand. Twenty-five feet is already generous against the speed of a collapse; fifty feet is not a rule anybody wrote down because it is not survivable.

There is a second reason. After a collapse, the ladder is how uninjured workers get out — and the fact that trained rescuers will need a way in and a shored trench to work in. In 06MI174 responders had to bring a ladder from the rescue rig and place it before the surviving worker could climb out; in 05MI084 untrained helpers entered an unprotected trench with sections of picket fence. Both reports flag those actions as exactly what a jobsite should have prevented by planning.

Which is why the emergency plan belongs in the same conversation as the ladder: who calls, what they say, who keeps people out, where the equipment is. It is a two-minute item at the tailgate, and it is the difference between one casualty and three.

6 The 30-second egress check

Four questions, asked at the edge:

• Is the trench 4 feet or deeper? Then there is a stairway, ladder or ramp in it.
• Pace it: is anyone more than 25 feet of walking distance from that means of egress?
• Is the ladder secured, on firm footing, rails 3 feet above the surface — and inside the box if there is one?
• Does everybody know who calls 911 and what they say?

If those four hold, this excavation is inside the third most-cited paragraph in Subpart P. The next chapter deals with something that cannot be seen at all: the air at the bottom.