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

When a ductile-iron pipeline is excavated through rock, DIPRA requires rock to be kept no closer than:

1 inch from the pipe at any diameter 6 inches from the bottom and sides for pipe up to 24 inches, and 9 inches for 30-inch and larger pipe 24 inches under the pipe and 0 inches at the sides Rock may touch the pipe if the bells are wrapped

Correct Answer:

6 inches from the bottom and sides for pipe up to 24 inches, and 9 inches for 30-inch and larger pipe

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