How far must filling, discharge, and vapor recovery connections be from the nearest building openings for underground storage tanks?

For underground storage tanks, the distance requirements for filling, discharge, and vapor recovery connections from the nearest building openings are critical for ensuring safety and minimizing risks associated with potential leaks or vapors. The correct answer of 5 feet aligns with established safety standards.

This 5-foot requirement is designed to mitigate the risk of flammable vapors entering buildings, which could pose serious fire hazards. Maintaining this distance helps ensure proper ventilation and allows for safe management of any hazards that may arise from fuel storage.

While other distances, such as 10, 15, or 20 feet, may seem reasonable, they exceed the minimum safety standard set forth in various regulations, which prioritize the balance between safety and practicality in urban planning and operational protocols.