What is the maximum depth allowed for an excavation in Type C soil without requiring a protective system under Cal/OSHA regulations?
Correct Answer
C) 5 feet
Cal/OSHA Section 1541.1 requires protective systems for excavations 5 feet or deeper, regardless of soil type. Excavations less than 5 feet may still require protection if hazardous conditions exist.
Why This Is the Correct Answer
Cal/OSHA Section 1541.1 requires a protective system for all excavations 5 feet or deeper. An excavation must be less than 5 feet deep to be exempt from protective system requirements (and even then, a competent person must determine no cave-in hazard exists). The maximum allowable depth without protection is therefore just under 5 feet, making 5 feet the threshold trigger.
Why the Other Options Are Wrong
Option A: 3 feet
3 feet is too conservative. Cal/OSHA does not require a protective system for excavations less than 5 feet deep (absent visible hazardous conditions). Excavations up to just under 5 feet may proceed without formal protection.
Option B: 4 feet
4 feet is incorrect. While 4 feet is less than the 5-foot threshold, the question asks for the maximum allowed depth β which is 5 feet as the trigger point (anything at 5 feet or deeper requires protection).
Option D: 6 feet
6 feet is incorrect. At 6 feet, a protective system is clearly required under Cal/OSHA β the threshold was reached at 5 feet.
Memory Technique
Think '5 feet = five fingers = stop sign.' When you hit 5 feet of depth, put your hand up β you need protection.
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