Trench and Excavation Safety

Why it matters

A cubic yard of soil weighs as much as a pickup truck. When a trench wall lets go, there is no outrunning it, and rescue almost never comes in time. Every trench 5 feet or deeper needs protection before anyone steps in, and the competent person decides what kind.

Hazards

• ⚠ Cave-ins from unprotected or poorly sloped walls
• ⚠ Spoil piles and equipment loading the trench edge
• ⚠ Water accumulation softening the walls
• ⚠ Struck-by from buckets and materials swinging overhead
• ⚠ Underground utilities: gas, electric, water
• ⚠ Bad air in deeper trenches near contamination sources

Controls and safe practices

• ✓ Protective system required at 5 feet: slope it, bench it, shore it, or shield it with a trench box.
• ✓ The competent person inspects the trench daily and after every rain before entry.
• ✓ Keep spoil piles and equipment at least 2 feet back from the edge.
• ✓ Ladder, ramp, or steps within 25 feet of every worker in trenches 4 feet or deeper.
• ✓ Call 811 and verify utility locates before digging. Hand-dig near marks.
• ✓ Nobody under suspended loads. Stay out of the swing radius.
• ✓ Do not enter a trench with standing water unless the competent person has controlled it.

Crew discussion questions

1. Who is the competent person for this excavation and when was the last inspection?
2. How are we getting out of the trench fast if something changes?
3. Where are the utility marks, and do they match what the plans show?
4. Did last night’s weather change the soil?

Applicable OSHA standards

29 CFR 1926.651, 29 CFR 1926.652

More toolbox talks

• Ladder Safety
• Fall Protection Basics
• Heat Illness Prevention
• Lockout / Tagout: Controlling Energized Circuits
• Silica Dust Control
• PPE Head to Toe

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