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

Flat-bottom trench, loose backfill Pipe bedded to its centerline in compacted granular material (4-inch minimum under the pipe), with compacted granular or select material to the top of the pipe at about 90 percent standard Proctor 4 inches of loose native soil under the pipe only Sand bedding to 1/8 diameter and 80 percent Proctor to the top of the pipe