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Fatal Trench Collapse Accident at Granite Operation: June 12, 2007

On June 12, 2007, a 45-year-old grade setter with 10 years' experience tragically lost his life while working on a reclamation project at a waste dump in California. The fatal incident occurred when the victim stepped into a trench, where a vertical wall collapsed, trapping him between two large clay pieces. The incident highlighted inadequate management policies and failure to assess ground conditions before permitting work in hazardous areas. Best practices emphasize the importance of examining ground conditions, identifying task-related hazards, and supporting trench walls for safety.

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Fatal Trench Collapse Accident at Granite Operation: June 12, 2007

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  1. MNM Fatal 2007-12 • Falling Material Accident • June 12, 2007 (California) • Granite Operation • Grade Setter • 45 years old • 10 years experience

  2. Overview The victim was fatally injured while working on a reclamation project at a waste dump. He stepped into a trench excavated into the side of the slope when a vertical wall collapsed, pinning him between two large pieces of clay.

  3. Root Cause Management policies and procedures were inadequate and failed to ensure that persons could work safely at the reclamation site. Ground conditions which created a hazard were not taken down or supported before work or travel was permitted.

  4. Best Practices • Carefully examine ground conditions prior to performing tasks near excavated embankments, trenches or ditches. • Identify hazards associated with the task to be performed, review those hazards with all personnel involved, and implement measures to ensure persons are properly protected. • Support trench walls or slope the walls to a safe angle.

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