Before the inspection hold point, the team confirms that the project condition shows that granular backfill is in a narrow trench. Which compaction equipment is appropriate?
Correct Answer
B) Use trench rammer or vibratory plate
trench rammer or vibratory plate 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
trench rammer or vibratory plate 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: Equipment choice: Use large smooth-drum roller
Equipment choice: Use large smooth-drum roller may relate to another site control, but it does not remove or guard the confined backfill compaction exposure being tested.
Option C: Use padfoot roller
Use padfoot roller may relate to another site control, but it does not remove or guard the confined backfill compaction exposure being tested.
Option D: Use pneumatic-tired roller
Use pneumatic-tired roller may relate to another site control, but it does not remove or guard the confined backfill compaction exposure being tested.
Memory Technique
Name the harm before the guard; equipment, large, smooth-drum cannot stand in for Manager Checking.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Earthwork tools; confined-area backfill compaction; verify the construction method, material selection, equipment choice, or work sequence that fits the field condition.
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