What is the maximum depth for an excavation in Type A soil before shoring or sloping is required?
Correct Answer
A) 5 feet
OSHA requires protection for excavations 5 feet or deeper. Even in stable Type A soil, excavations deeper than 5 feet must have protective systems such as sloping, benching, or shoring.
Why This Is the Correct Answer
OSHA 29 CFR 1926.652 establishes that excavations 5 feet or deeper in any soil type require protective systems. This is a universal safety threshold that applies even to the most stable Type A soil classifications. The 5-foot rule is designed to protect workers from cave-ins, which can occur suddenly and without warning even in stable soil conditions. This regulation is strictly enforced and is a fundamental safety requirement for all excavation work.
Why the Other Options Are Wrong
Option B: 4 feet
6 feet exceeds the maximum allowable depth without protection - this would require shoring, sloping, or benching
Option C: 8 feet
8 feet is well beyond the safety threshold and would definitely require protective systems regardless of soil type
Memory Technique
Think 'High FIVE for safety' - 5 feet is the maximum depth before protection is required
Reference Hint
OSHA Construction Standards 29 CFR 1926 Subpart P - Excavations, specifically section 1926.652
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