A trench is 8 feet deep in Type B soil with groundwater seepage. Workers will enter for 3 hours to install utilities. What protection system is required?
Correct Answer
D) Shoring or shielding system
At 8 feet deep with groundwater seepage in Type B soil, a shoring or shielding system is required. The presence of water and the depth make sloping impractical and unsafe for worker entry.
Why This Is the Correct Answer
CORRECT_ANSWER - At 8 feet deep with groundwater seepage in Type B soil, OSHA requires a protective system that can handle both the depth and water conditions. Shoring or shielding systems are specifically designed to protect workers in deep excavations with challenging conditions like groundwater. The combination of depth exceeding 5 feet and water seepage makes mechanical protection systems mandatory rather than relying on sloping alone.
Why the Other Options Are Wrong
Option A: No protection needed
Simple 45-degree sloping is insufficient for Type B soil, which requires a flatter 1:1 slope ratio. Additionally, groundwater seepage compromises soil stability, making any sloping system unreliable and potentially dangerous at this depth.
Option C: Simple sloping at 45 degrees
Protection is absolutely required for any excavation 5 feet or deeper where workers will enter. At 8 feet with groundwater present, this becomes a high-risk situation requiring maximum protection under OSHA standards.
Memory Technique
Water + Deep = Shield/Shore. Think 'When it's WET and DEEP, you need STEEP protection (mechanical systems)' - sloping won't cut it with water present.
Reference Hint
OSHA Construction Standards 29 CFR 1926 Subpart P - Excavations, specifically sections on protective systems and soil classification
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