GA Contractor drive mode. Environment & Safety. 10 questions.
Question 1 of 10.
A 7 feet deep trench is cut entirely in stable rock. Under 29 CFR 1926.652, is a cave-in protective system required?
A: Yes, unless a registered professional engineer certifies the rock
B: Yes, because every excavation 5 feet or deeper needs a protective system
C: No, because excavations made entirely in stable rock are exempt
D: No, but only if the trench is inspected weekly
NEXT: A · B · C · D
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