Your crew needs to excavate a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the sides of this excavation?
Correct Answer
B) 1:1 (horizontal to vertical)
For Type B soil, OSHA 29 CFR 1926.652 requires a maximum allowable slope of 1:1 (45 degrees) or 1 horizontal to 1 vertical. This provides adequate stability for most cohesive soils with medium strength.
Why This Is the Correct Answer
OSHA 29 CFR 1926.652 specifically mandates that Type B soil excavations must have a maximum allowable slope of 1:1 (horizontal to vertical), which equals a 45-degree angle. Type B soils are cohesive soils with medium compressive strength, and this slope ratio provides the necessary stability to prevent cave-ins. The 1:1 ratio means for every foot of depth, you need one foot of horizontal distance from the edge, making it the standard safety requirement for this soil classification.
Why the Other Options Are Wrong
Option C: 3/4:1 (horizontal to vertical)
A 3/4:1 slope ratio (0.75 horizontal to 1 vertical) is still too steep for Type B soil excavations and does not meet the minimum 1:1 ratio required by OSHA regulations.
Option D: 1.5:1 (horizontal to vertical)
A 1/2:1 slope ratio (0.5 horizontal to 1 vertical) creates a steeper excavation than allowed for Type B soil, which would be unsafe and violate OSHA standards for this soil type.
Memory Technique
Type B = 1:1 - Remember 'B for Balanced' since 1:1 is a perfectly balanced ratio, and Type B is the middle classification between Type A and Type C soils.
Reference Hint
OSHA Construction Standards 29 CFR 1926 Subpart P - Excavations, specifically section 1926.652 Requirements for protective systems
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