What are two options for meeting the cover requirements for O/C tanks without mechanical anchoring in non-traffic conditions?

The appropriate choice for meeting the cover requirements for underground storage tanks (USTs) without mechanical anchoring in non-traffic conditions involves the use of a minimum of 2 feet of backfill or a combination of 1 foot of backfill along with 4 inches of concrete. This combination ensures adequate protection and stability for the UST, taking into account the weight and structure of the overhead materials.

When evaluating this, the use of 2 feet of backfill provides sufficient soil coverage and pressure to support the tank while minimizing potential movement or floating in case of groundwater fluctuations. Alternatively, the combination of 1 foot of backfill along with 4 inches of concrete offers a stable foundation, with the concrete layer serving to provide additional weight and structural integrity, which is crucial in non-traffic conditions where there may be a risk of external forces acting on the tank.

This approach aligns with established safety and structural guidelines for UST management, ensuring that both protection from physical forces and prevention of environmental contamination are adequately addressed.