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

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When NMDOT 2019 utility-trench specifications allow sheeting to be left in place, how far below the ground surface must it be cut off?

Flush with finished grade At least 1 foot below the ground surface 6 feet below the pipe invert It must never be cut and must project 3 feet for a fence

Correct Answer:

At least 1 foot below the ground surface

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