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

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A pipe crew’s excavator can open 80 feet of trench per hour, but joint assembly and bedding average 40 feet per hour, and there is only one trench box. What is the sustainable production?

80 feet per hour, because the excavator is the most expensive machine 40 feet per hour, limited by the slower laying/bedding operation and the single shield 120 feet per hour, the sum of the two rates Unlimited, because CPM float will absorb the mismatch

Correct Answer:

40 feet per hour, limited by the slower laying/bedding operation and the single shield

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