According to Cal/OSHA trenching regulations, at what depth must a competent person inspect the excavation?
Correct Answer
D) 5 feet
Cal/OSHA Section 1541 requires competent person inspection for excavations 5 feet or deeper.
Why This Is the Correct Answer
Cal/OSHA Section 1541 (Excavations) requires that a competent person inspect excavations, adjacent areas, and protective systems before each workday and as needed throughout the shift. This inspection requirement is triggered at 5 feet of depth. At this depth, the risk of cave-in becomes significant enough that a qualified assessment of soil conditions, water infiltration, and shoring systems is mandatory.
Why the Other Options Are Wrong
Option A: 3 feet
3 feet is below the Cal/OSHA threshold for mandatory competent-person inspection. At this shallow depth, formal inspection requirements under Section 1541 have not yet been activated. Selecting this answer reflects an underestimate of the required safety trigger depth.
Option B: 4 feet
4 feet is one foot short of the actual 5-foot threshold and is a common distractor. Federal OSHA uses a 5-foot threshold as well, and 4 feet does not correspond to any specific inspection trigger in Cal/OSHA trenching regulations.
Option C: 6 feet
6 feet is the depth at which protective systems (shoring, sloping, or shielding) become mandatory under Cal/OSHA, but the competent-person inspection requirement kicks in earlier — at 5 feet. Confusing the shoring trigger (6 ft) with the inspection trigger (5 ft) is a very common exam mistake.
Memory Technique
Use the phrase: '5 feet = inspector's beat; 6 feet = shore it neat.' At 5 feet a competent person must check; at 6 feet you must install physical protection. Picture a 5-foot ruler standing upright in a trench with an inspector holding a clipboard.
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