NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

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A storm-outfall trench in running sand with a high water table must be excavated 12 feet deep. Which equipment and method package is the most appropriate first plan?

A small rubber-tired backhoe, vertical unshored walls, and no dewatering A hydraulic excavator matched to the reach, a trench shield or shoring rated for Type C, and dewatering (wellpoints or sumps) so the bottom can be prepared A motor grader only, because sand cannot be excavated any other way Hand shovels only, because machines are banned in sand

Correct Answer:

A hydraulic excavator matched to the reach, a trench shield or shoring rated for Type C, and dewatering (wellpoints or sumps) so the bottom can be prepared

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