Massachusetts Plumbers Journeyman Practice Exam

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When trenching where the pipe does not form the bed at the bottom, how should the trench be backfilled?

With concrete
Left open for inspection
Back-filled to grade with sand tamped in place
With loose soil

The correct answer is: Back-filled to grade with sand tamped in place

The correct choice of backfilling the trench with sand tamped in place is based on best practices for ensuring stability and proper drainage. Sand is an ideal material for backfilling around pipes because it provides excellent support while allowing for some movement without causing damage to the pipe. Tamping the sand in place helps eliminate any voids that could lead to settling over time, which is critical for maintaining the integrity of both the pipe and the surrounding soil. Using loose soil, while it might seem a reasonable option, can lead to issues such as erosion or uneven settling, potentially compromising the structural integrity of the installation. Leaving the trench open for inspection might be necessary in certain scenarios, but it does not address the need for backfilling immediately for safety and stability. Filling with concrete would create an inflexible environment that could damage the pipe if any movement occurs in the ground, so it is not appropriate for all situations. In summary, backfilling to grade with sand that is tamped in place ensures the pipe is securely supported and minimizes the risk of future problems.