Under OSHA standards, what is the maximum allowable slope for an excavation in Type A soil without protective systems?
Correct Answer
D) 3/4:1 (53 degrees)
OSHA 29 CFR 1926 specifies that Type A soil excavations can have a maximum slope of 3/4:1 (53 degrees from horizontal) without additional protective systems. This ensures worker safety in excavations.
Why This Is the Correct Answer
Under OSHA 29 CFR 1926.652, Type A soil excavations without protective systems have a maximum allowable slope of 3/4:1 (53 degrees from horizontal). Type A soil is the most stable soil classification, including clay, cemented soil, and hardpan. This slope ratio means for every 3/4 foot horizontal distance, there is 1 foot vertical rise, creating a 53-degree angle that provides adequate stability while ensuring worker safety in excavations.
Why the Other Options Are Wrong
Option A: 1/2:1 (63 degrees)
A slope of 1/2:1 (63 degrees) is too steep for any OSHA excavation standards. This steep angle would create unstable conditions and significantly increase the risk of cave-ins, making it unsafe for workers in excavations.
Option C: 1.5:1 (34 degrees)
A 1:1 slope (45 degrees) is the maximum allowable slope for Type B soil, not Type A. Type A soil, being more stable, can safely accommodate a steeper slope of 3/4:1 without requiring protective systems.
Memory Technique
Remember 'A-3/4, B-1, C-1.5' - Type A soil gets 3/4:1, Type B gets 1:1, Type C gets 1.5:1. Think 'A is Awesome and stable, so it can be steeper at 3/4.'
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