What is the maximum allowable depth for an excavation in Type A soil before requiring protective systems?
Correct Answer
D) 20 feet
OSHA allows excavations in Type A soil (the most stable) to be dug vertically up to 20 feet deep before requiring protective systems like sloping, benching, or shoring. However, protective systems are required at 5 feet for employee entry.
Why This Is the Correct Answer
According to OSHA regulations, Type A soil is the most stable soil classification and can maintain vertical sides up to 20 feet deep before protective systems are required. Type A soil has high cohesive strength and unconfined compressive strength of 1.5 tons per square foot or greater. This 20-foot limit applies specifically to the maximum allowable depth before protective systems become mandatory. However, it's important to note that while protective systems aren't required until 20 feet, employee protection is still required at 5 feet depth for worker entry.
Why the Other Options Are Wrong
Option A: 5 feet
15 feet is not the correct maximum depth for Type A soil excavations. This may be a distractor that falls between common safety thresholds but is not the actual OSHA requirement.
Option B: 10 feet
10 feet is not the correct threshold for Type A soil. This depth might be confused with requirements for other soil types or different safety provisions.
Option C: 15 feet
5 feet is the depth at which protective systems are required for employee entry into excavations, but this is not the maximum allowable depth for excavation in Type A soil before protective systems are required.
Memory Technique
Think 'A-grade soil = 20 feet max' - Type A is the best soil type, so it gets the maximum allowable depth of 20 feet before protection is required.
Reference Hint
OSHA Construction Standards 29 CFR 1926 Subpart P - Excavations, specifically 1926.652 Requirements for protective systems
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