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

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A grade stake at the trench centerline reads existing ground 5,210.40 and proposed invert 5,204.15. The pipe OD is 16 inches and the specified bedding below the invert is 6 inches. How deep must the excavation be below existing ground to the bedding subgrade?
Correct Answer:
6.75 feet

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