For areas subject to vehicle traffic, what is the minimum thickness of compacted backfill required?

The minimum thickness of compacted backfill required in areas subject to vehicle traffic is 30 inches. This specification is critical because it ensures that the backfill provides adequate support to handle the weight and pressure exerted by vehicles. Insufficient thickness could lead to settlement or shifting of the backfill material, which can compromise the integrity of the underground storage tank system.

Additionally, the design is determined not only by the load-bearing requirements but also by regulatory standards that ensure safety and environmental protection. These standards are based on engineering principles that account for soil types, compaction techniques, and anticipated traffic loads. Thus, the specified thickness of 30 inches is a conservative measure that enhances stability and minimizes the risk of structural failure in locations where heavy vehicles may frequently pass over. Proper adherence to this requirement is essential for maintaining compliance with industry standards and protecting the infrastructure surrounding underground storage tanks.