Before releasing the work, the team identifies this condition: the controlling field constraint is that a narrow vertical trench needs worker entry and cannot be laid back. Which excavation protection fits best?
Correct Answer
C) Select engineered trench box or shoring
engineered trench box or shoring best matches the stated condition. The other choices are real construction options in the same family, but they fit different field conditions.
Why This Is the Correct Answer
engineered trench box or shoring best matches the stated condition. The other choices are real construction options in the same family, but they fit different field conditions.
Why the Other Options Are Wrong
Option A: Select sloping or benching where space permits
Select sloping or benching where space permits may relate to another site control, but it does not remove or guard the trench protective system exposure being tested.
Option B: Select hydraulic shoring for trench walls
Select hydraulic shoring for trench walls may relate to another site control, but it does not remove or guard the trench protective system exposure being tested.
Option D: Select trench shield set by competent-person direction
Select trench shield set by competent-person direction may relate to another site control, but it does not remove or guard the trench protective system exposure being tested.
Memory Technique
Name the harm before the guard; sloping, benching, space cannot stand in for Manager Checking.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Earthwork methods; trench protection and excavation support; verify the construction method, material selection, equipment choice, or work sequence that fits the field condition.
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