SC Water And Sewer Lines Practice Questions - South Carolina Water And Sewer Lines Contractor Examination Exam

When a ductile-iron trench is excavated in rock, how far must rock be kept from the pipe?

Rock may touch the pipe if polyethylene encasement is used No closer than 6 inches to the bottom and sides for pipe up to 24 inches, and no closer than 9 inches for 30-inch and larger pipe A 2-inch sand pad under the invert only 12 inches under the invert and no clearance at the sides

Correct Answer:

No closer than 6 inches to the bottom and sides for pipe up to 24 inches, and no closer than 9 inches for 30-inch and larger pipe

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