How deep must bedding material extend below the line in a trench?

The correct answer is 6" below the line in a trench, which aligns with industry standards for the proper installation of sewer systems. The bedding material serves as a foundation for the piping system, providing support and helping to distribute the weight of the soil above. Extending the bedding material 6 inches below the line ensures that the pipes are adequately supported and minimizes the risk of settling or other structural failures over time. This depth is established to accommodate variations in soil conditions and to provide a stable environment for the piping. Following this guideline helps maintain the integrity of the sewage system, ensuring that it functions properly and lasts for the expected lifespan.