An excavation project requires a trench 8 feet deep and 150 feet long. According to OSHA 29 CFR 1926.652, what is required for worker protection?
Correct Answer
B) Shoring or sloping system
OSHA requires protective systems (shoring, sloping, or shielding) for excavations 5 feet or deeper. At 8 feet deep, this excavation definitely requires a protective system to prevent cave-ins.
Why This Is the Correct Answer
OSHA 29 CFR 1926.652 mandates that excavations 5 feet or deeper must have protective systems to prevent cave-ins and protect workers. At 8 feet deep, this trench exceeds the 5-foot threshold and requires either shoring, sloping, or shielding systems. The regulation gives contractors flexibility to choose the most appropriate protective system based on soil conditions, space constraints, and project requirements.
Why the Other Options Are Wrong
Option A: Sloping only
Sloping only is insufficient because while sloping is one acceptable protective system, OSHA allows multiple options (shoring, sloping, or shielding). The question asks what is required, and the complete answer must acknowledge that contractors can choose from several approved protective systems, not just sloping.
Option C: Safety harnesses only
Safety harnesses alone do not protect against cave-ins, which are the primary hazard in deep excavations. Harnesses are fall protection equipment and would not prevent soil collapse or protect workers from being buried in a trench cave-in.
Option D: Warning signs only
Warning signs alone provide no physical protection against cave-ins and soil collapse. While signs may be part of a comprehensive safety plan, they cannot prevent the excavation walls from failing and burying workers.
Memory Technique
Remember 'Five to Stay Alive' - excavations 5 feet or deeper need protective systems to keep workers alive and safe from cave-ins.
Reference Hint
OSHA Construction Standards 29 CFR Part 1926, Subpart P - Excavations, specifically section 1926.652 on protective systems
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