Practice question

What is the correct method for compacting backfill material in a conduit trench?

  1. Dump all material at once and drive heavy equipment over it
  2. Place backfill in lifts of 6 to 12 inches and compact each lift to specified density
  3. Leave the backfill loose without compaction
  4. Use only water to settle the backfill

Answer: B — Place backfill in lifts of 6 to 12 inches and compact each lift to specified density

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