Just So You Know; Trench box must extend 2 ft above surrounding soil level OSHA requires trench shields extend at least 18–24 inches above surrounding ground to prevent cave-in material from entering. correct answer
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The statement "Trench box must extend 2 ft above surrounding soil level" is correct.
- Explanation: OSHA (Occupational Safety and Health Administration) regulations for trenching and excavation require that trench shields (or trench boxes) extend at least 18 to 24 inches (which is 1.5 to 2 feet) above the surrounding ground level. This is to prevent loose soil or other material from falling into the excavation and injuring workers. Your statement of "2 ft" (24 inches) falls within this required range.
✅ Correct
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