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

For buried PVC pressure pipe, AWWA M23 identifies which embedment zone as most important for limiting ring deflection?

Final backfill from 2 feet above the pipe to finished grade only The haunch and initial backfill from the trench bottom up to about 75 percent of the outside diameter A 6-inch layer of large cobbles dumped on the crown Native clods placed only under the bells

Correct Answer:

The haunch and initial backfill from the trench bottom up to about 75 percent of the outside diameter

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