What must happen to the lines and entry points of a UST when it is temporarily closed?

When a UST is temporarily closed, all lines and entry points must be capped and secured to prevent any potential leaks or contamination of the surrounding environment. Capping and securing these access points ensures that no hazardous substances can escape while the tank is not in use, safeguarding groundwater and soil. This precaution is vital in maintaining environmental integrity and compliance with regulatory requirements.

Leaving lines open—for inspections or otherwise—could lead to accidental spills, environmental damage, or unauthorized access. Similarly, the notion of only attending to vent lines neglects the importance of securing all connections and access points to ensure comprehensive safety measures. Therefore, capping and securing all lines and entry points is a crucial step in responsible UST management during temporary closures.