AZ ROC C-54 Water Conditioning Equipment Practice Questions - Arizona ROC C-54 Water Conditioning Equipment Examination Exam

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At what minimum trench depth does OSHA 1926.652 require an engineered protective system (sloping, benching, shoring, or shielding) unless the excavation is made entirely in stable rock?

3 feet 4 feet 5 feet 6 feet

Correct Answer:

5 feet

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