A fueling system is considered underground if ____% or more is below ground.

A fueling system is considered underground if ____% or more is below ground.

• A. 5%
• B. 10%
• C. 15%
• D. 25%

Answer: (B)

Underground status is determined by how much of the fueling system sits below ground. If ten percent or more is buried, the system is considered underground. That threshold matters because underground systems require stricter safety and environmental controls, such as corrosion protection, leak detection, and containment measures. Smaller buried fractions don’t meet the underground definition, while any percentage at or above ten percent does, making ten percent the tipping point.

Underground status is determined by how much of the fueling system sits below ground. If ten percent or more is buried, the system is considered underground. That threshold matters because underground systems require stricter safety and environmental controls, such as corrosion protection, leak detection, and containment measures. Smaller buried fractions don’t meet the underground definition, while any percentage at or above ten percent does, making ten percent the tipping point.