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

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DIPRA says the trench bottom should be true and even so the pipe barrel has soil support for its full length. Soft subgrade may be improved by:

Bumping the pipe to grade with the backhoe bucket Adding and compacting crushed stone up to 2 inches in diameter, then bringing the bottom to grade Leaving voids under the midspan of each pipe so water can drain Resting the pipe on old masonry walls found in the trench

Correct Answer:

Adding and compacting crushed stone up to 2 inches in diameter, then bringing the bottom to grade

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