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What is the primary purpose of backfilling after excavation or boring?

  1. To restore the surface appearance

  2. To ensure the stability of the conduit or cable installed

  3. To keep the area free from erosion

  4. To make the site accessible for further construction work

The correct answer is: To ensure the stability of the conduit or cable installed

The primary purpose of backfilling after excavation or boring is to ensure the stability of the conduit or cable installed. When a trench or hole is created for the installation of utilities such as conduits or cables, it is crucial to adequately backfill the area to provide support and protect these underground installations. Proper backfilling helps distribute the load above the ground level and prevents settling or shifting of the surrounding soil, which can compromise the integrity of the utilities. Additionally, backfilling contributes to the proper functioning of the installed systems by minimizing the risk of damage from external forces, such as vehicles or heavy equipment. It also helps prevent voids that could lead to future surface subsidence. Hence, the primary discussion should focus on the relationship between backfilling and the stability and performance of underground installations, which is why this choice is the most relevant.