According to Cal/OSHA excavation standards in Title 8 CCR Section 1541, Type C soil classification requires protective systems for excavations exceeding what depth?
Correct Answer
B) 5 feet
Title 8 CCR Section 1541 mandates that excavations in Type C soil (the least stable soil type) require protective systems when exceeding 5 feet in depth. Type C includes granular soils, submerged soil, and soil from which water is freely seeping, requiring the most stringent protection requirements.
Why This Is the Correct Answer
Title 8 CCR Section 1541 mandates protective systems (shoring, sloping, or shielding) for Type C soil excavations exceeding 5 feet in depth. Type C is the least stable soil classification, encompassing granular soils, submerged soils, and soils with freely seeping water, all of which collapse with little warning — hence the 5-foot threshold rather than the 4-foot threshold that applies in no-classification or less-defined scenarios.
Why the Other Options Are Wrong
Option A: 6 feet
6 feet is the federal OSHA threshold for fall protection (not excavation protective systems) and is also associated with competent person inspection requirements. It is not the depth trigger for protective systems in Type C soil under Cal/OSHA.
Option C: 4 feet
4 feet does not trigger protective systems under Title 8 CCR 1541 for Type C soil. A competent person must visually assess the excavation at 4 feet, but the structural protective system requirement kicks in at 5 feet.
Option D: 3 feet
3 feet is below the threshold for any protective system requirement under Cal/OSHA excavation standards. At 3 feet, the worker may be at risk but no protective system is mandated by code.
Memory Technique
Think 'five feet to stay alive' — in an unstable Type C excavation, once you go past 5 feet, you need protection to stay alive. The rhyme makes the number memorable.
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