A crew places a 24-inch backfill lift where the compactor is approved for 8-inch lifts. What should be done?
Correct Answer
C) Remove or rework material into acceptable lift thickness and compact/test again.
Too-thick lifts may not compact throughout their depth and must be reworked.
Why This Is the Correct Answer
Too-thick lifts may not compact throughout their depth and must be reworked.
Why the Other Options Are Wrong
Option A: Select compact only the top surface for backfill lift too thick
The trap in A is Compact only the top surface. That selection is wrong because the option delays or omits the controlling step.
Option B: Handle backfill lift too thick by choosing to place pavement immediately
Choice B gives Place pavement immediately. Its specific error: it leaves out the controlling Backfill lift too thick result: Remove or rework material into acceptable lift thickness and compact/test again.
Option D: Apply mark it as an allowance to the backfill lift too thick condition
In site construction, Mark it as an allowance. is the wrong selection for Backfill lift too thick: the option does not produce the required Backfill lift too thick outcome, Remove or rework material into acceptable lift thickness and compact/test again.
Memory Technique
Picture a redline on the jobsite; backfill lift too thick is solved by the action that leads to Remove or rework material into acceptable lift thickness and compact/test again.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - bedding / backfill / compaction to confirm that Too-thick lifts may not compact throughout their depth and must be reworked.
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