Practice question

Proof rolling a finished subgrade is performed to:

  1. Replace laboratory Proctor testing for the entire job
  2. Detect soft, pumping, or unstable areas under a loaded pneumatic or proof roller
  3. Measure exact percent compaction to the nearest 0.1 percent
  4. Determine the OSHA soil type of the cut slope

Answer: B — Detect soft, pumping, or unstable areas under a loaded pneumatic or proof roller

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