Safety
Trench Safety — Daily Inspection
Ensure a competent person inspects every trench before workers enter.
7 min David Chen Reviewed by Rachel Kim, CHST, CSP v1.2 · reviewed 2026-07-20
The Problem
Workers enter trenches that have deteriorated overnight from rain, vibration or spoil-pile creep, and get injured in collapses.
Root Causes
- Assumption that yesterday's inspection is still valid today
- No documented competent-person inspection log
- Spoil pile placed too close to trench edge
Correct Procedure
- 1Competent person inspects the trench at the start of every shift
- 2Inspection repeats after any rain event or vibration source
- 3Document inspection in the site log with timestamp and initials
- 4Verify sloping/shoring/shielding matches soil classification
- 5Check that spoil piles are at least 2 feet from the trench edge
Prevention Steps
- Post competent-person's name on the trench-entry sign
- Attach the daily inspection form to the excavator or trench box
- Stop work if any indicator (cracks, sloughing, water) is observed
Discussion Questions
Use these to engage the crew and connect the lesson to today's site conditions.
- 1Who is our competent person on this trench today?
- 2What conditions require a re-inspection during the shift?
- 3What are three warning signs of an unstable trench?
Knowledge Check
How often must a trench be inspected by a competent person?
At the start of each shift and after any hazard-increasing event (rain, vibration, etc.).
Sources & Review
Author: David Chen (22+ yrs) · Reviewed by Rachel Kim, CHST, CSP.
Published 2024-04-02 · Last technical review 2026-07-20 · Version 1.2 · Languages: EN, ES
AI at QST only summarizes expert-approved content and never invents safety requirements.
Related Lessons
Arc-Flash Awareness for Panel Work
Recognize arc-flash boundaries and confirm safe work practices before opening panels.
Load Securement for Fleet Vehicles
Secure every load properly to prevent public injury, cargo loss and DOT violations.
HVAC Refrigerant Handling Safety
Handle refrigerants safely — protecting worker health and the environment.
Ladder Safety — Pre-Use Inspection
Inspect every ladder before use and follow three-points-of-contact.