NM CID GF-9 Practice Questions - New Mexico CID GF-9 Utility Lines Contractor Examination Exam

Why is trench backfill placed and compacted in lifts rather than dumped full-depth and then rolled on top?

Because full-depth dumps automatically reach 95 percent density Because compactors only densify a limited thickness; thick dumps leave loose soil that later settles To satisfy the 811 18-inch tolerance zone So the SWPPP can skip inlet protection

Correct Answer:

Because compactors only densify a limited thickness; thick dumps leave loose soil that later settles

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