When plastic sewer and drainage pipes are buried in the ground, follow a few common-sense rules. First, lay the pipes on unexcavated trench bottom, not on soft fill. Fill could settle unevenly, making low spots in the pipeline. Dig out depressions for the couplings so that lengths of pipe are fully bedded, not bridged between couplings. Backfill around the pipes should be free from rocks that could damage the pipe walls.
Packed sand is a good initial backfill.
Once the pipes are well covered, use ordinary backfill the rest of the way. Follow all safety precautions. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document .