2026-10-02 · construction-safety · both

After Rain, Verify the Trench Before Re-entry

A fatal trench collapse puts the focus on post-rain inspections, adequate protection, and a clear handoff before entry.

Published by Daily Safety Moment · Updated:

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On July 4, 2022, a contractor and a laborer died in a trench collapse while replacing a residential sewer line. Washington FACE's preliminary report describes a collapse after rain the previous day and no trench protection at the fatal incident. WA FACE

For today's planned trench entry after rain, follow OSHA's inspection guidance: a competent person must inspect the excavation, adjacent areas, and protective systems before workers are exposed. OSHA calls for inspections before work, as needed during the shift, and after rainstorms or other hazard-increasing events. If the inspection finds unsafe conditions, the employer must clear workers from the hazardous area until necessary safety precautions are taken. For today's planning, field and office leads should confirm who will arrange that inspection before coordinating entry. OSHA excavation guidance, page 13

What the incident record says

The preliminary narrative says workers cleared the previously collapsed soil that morning. The contractor and laborer then entered; a wall collapsed moments later. Investigators reported that trench protection was not used and that shoring equipment on site was inadequate for the trench. The narrative does not establish that rain caused the fatal collapse. WA FACE

Adaptable control plan

Discuss these proposed actions for your work; they are not additional findings about the incident. OSHA's control framework prioritizes elimination or substitution and engineering solutions before work practices, administrative controls, and PPE. OSHA guidance

  • Avoid exposure: Can the task be completed without entering the excavation? Have the team evaluate feasible options and any new hazards before changing the method.
  • Provide adequate protection: Federal construction rules require an adequate cave-in protective system unless the excavation is entirely in stable rock, or is less than 5 feet deep and a competent person's examination finds no indication of a potential cave-in. Equipment merely being on site is not the same as an adequate system in place. OSHA 1926.652(a)
  • Arrange inspection and correction: For planned excavation work, confirm competent-person inspections before work, as needed during the shift, and after rainstorms or other hazard-increasing events. If unsafe conditions are found, clear workers from the hazardous area until necessary safety precautions are taken. OSHA excavation guidance, page 13

Discussion questions — adaptable planning prompts

  • Which planned activity involves trench entry after rain, and what needs checking before exposure?
  • For office or facilities coordination, who is the excavation contact, and what inspection arrangements and resources need confirmation?
  • Confirm your site's stop-work and no-retaliation procedures: how should someone raise an unresolved concern?

Choose an owner with authority to complete each action and agree on a due time. OSHA recommends assigning responsibility, setting completion dates, and planning how to verify controls. OSHA guidance

  • Confirm whether entry can be avoided; if entry is needed, confirm adequate cave-in protection for the actual excavation. Owner: Assign a responsible owner Due: Before planned entry
  • Arrange the required competent-person inspection and follow through on identified hazards. Owner: Assign an inspection coordinator Due: Before exposure; repeat after rain or other hazard-increasing events
  • Share the inspection outcome and unresolved items with affected field and office contacts. Owner: Assign a communication owner Due: Before coordinating entry

Verification question: What evidence confirms that the competent-person inspection occurred and necessary precautions are in place? Close-the-loop question: Who will confirm completion to affected workers and coordinators, and what remains unresolved?

Comprehension check: Comprehension check: After a rainstorm, who must inspect the excavation before workers are exposed? A competent person must inspect it.

Sources

  1. Contractor and Laborer Buried in Trench Collapse — Washington State Department of Labor & Industries, WA FACE. Accessed 2026-10-02. lni.wa.gov
  2. Trenching and Excavation Safety — site inspections — OSHA. Accessed 2026-10-02. osha.gov
  3. 1926.652 — Requirements for protective systems — OSHA. Accessed 2026-10-02. osha.gov
  4. Hazard Prevention and Control — OSHA. Accessed 2026-10-02. osha.gov

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