Backfilling is the final process of RCP installation. The backfill material is initially placed on either side of the pipe. The material must not be bulldozed or dropped directly into the trench. The backfill material must not include boulders, that during compaction can damage the pipe. The backfill must be free from roots or any organic matter. After backfilling and compacting, the trench is filled to the required grade as per the project specifications. Ensure that the pipe is deep below the ground before driving any heavy construction equipment over it.