U.S. Bureau of Labor Statistics (BLS) data show that 271 workers died in trenching or excavation cave-ins from 2000 through 2006.
Certification for trenching & excavation ops compliant with OSHA specified in 2 CFR 9 2 Subpart P. Recognize, evaluate, & control health & safety
Competent Person for Excavation, Trenching & Shoring Training – 1 day
Protecting Workers from Trench Collapses -- Occupational Health & Safety
File:Trench box.jpg - Wikipedia
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OSHA Responds to Alarming Number of Trenching Deaths : CEG
Trenching & Excavations – Environmental Health and Safety
Trenching and Excavation Hazards and Safety
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Trenching and Excavation Safety Resources Occupational Safety and Health Continuing Education
OSHA Responds to Alarming Number of Trenching Deaths : CEG