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

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When a ductile iron trench is excavated in rock, how much clearance does DIPRA require between the rock and the pipe for diameters up to 24 inches?

2 inches under the invert only 6 inches from the bottom and sides 9 inches from the bottom and sides 12 inches all around, including over the crown

Correct Answer:

6 inches from the bottom and sides

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