For a trench excavation 12 feet deep in Type B soil, what is the maximum allowable slope according to Cal/OSHA if sloping is used instead of shoring?
Correct Answer
B) 1:1 (45 degrees)
Cal/OSHA Section 1541.1 specifies a maximum slope of 1:1 (45 degrees from horizontal) for Type B soil excavations.
Why This Is the Correct Answer
Cal/OSHA Section 1541.1 classifies Type B soil as requiring a maximum slope of 1:1 (horizontal:vertical), which equals 45 degrees from horizontal. This is the middle ground between Type A soil (0.75:1) and Type C soil (1.5:1).
Why the Other Options Are Wrong
Option A: 0.5:1 (63 degrees)
0.5:1 (63 degrees) is steeper than allowed for Type B soil and is not a recognized Cal/OSHA slope classification for any soil type. A 63-degree slope would be unsafe in Type B conditions.
Option C: 0.75:1 (53 degrees)
0.75:1 (53 degrees) is the maximum slope for Type A soil β the most stable classification. Using this slope in Type B soil would be too steep and violate Cal/OSHA Section 1541.1.
Option D: 1.5:1 (34 degrees)
1.5:1 (34 degrees) is the required slope for Type C soil β the least stable classification. While this would be safe in Type B soil, it is not the maximum allowable slope and would result in unnecessarily wide excavations.
Memory Technique
ABC slopes: A=three-quarters, B=one-to-one, C=one-and-a-half. Think of soil stability going from A (best/steepest angle) to C (worst/flattest angle). B is perfectly balanced at 45 degrees β a right-angle diagonal.
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