Most utility companies recommend how much sand backfill over their lines prior to backfilling with excavation material?

Utility companies often recommend using a sand backfill of around 1 foot over utility lines before proceeding with the backfill of the excavation material. This practice is beneficial for several reasons.

Sand is a non-cohesive and highly permeable material, which allows for better drainage around the utility lines, reducing the risk of moisture accumulation that could lead to corrosion or damage over time. Additionally, the cushioning effect of sand provides a protective layer against potential impacts or stresses from the excavation material that is placed on top, ensuring the utilities remain operational and undamaged.

A backfill depth of 1 foot strikes a balance, as it is sufficient to cover the utilities without creating excessive weight or pressure from the materials placed above, which is particularly important for maintaining the integrity of the lines. Using too little sand may not provide adequate protection, while using more than needed could be an unnecessary expenditure, both in terms of materials and labor.