Above what level should tank vents and openings be extended during installation?

Tank vents and openings are essential components of an underground storage tank (UST) system as they allow for the release of vapors and prevent over-pressurization or vacuum conditions. The correct practice is to extend tank vents and openings above the flood-stage water level during installation.

This ensures that in the event of flooding, the vents and openings remain above the potential water level. This is critical for two primary reasons: first, it prevents the entry of water into the tank which could lead to contamination of the stored product and second, it mitigates risks associated with vapor emissions and potential water damage to the tank system. Maintaining vents above this flood stage is also vital for environmental protection and compliance with regulatory standards, as water intrusion can lead to significant environmental hazards.

While other levels mentioned have their importance, they do not address the specific risks associated with flooding conditions. Elevating vents above the flood-stage water level creates a safer and more reliable storage environment.