Last month we discussed piping basics for the house sewer line and supply pipes in an onsite system. Now we’ll review best practices for excavating trenches, laying pipes for the dispersal portion of the system and bedding the pipe properly.Trenches must be dug, prepared and backfilled in a way that prevents pipe damage. Common damage includes cracking, breaking joints and creating dips or bends in the pipe. Trench bottoms should be free of rocks and debris, continuous and provide uniform support. If there is bedrock, hardpan or large rocks on the trench bottom, the trench should be bedded with sand.Trenches
