California ICC UST Inspector Practice Exam

During temporary closure, which UST openings must be sealed?

1. Fill and vent locations

2. Fill and access locations

3. Access and vent locations

4. Vent locations only

The correct answer is: Fill and access locations

During the temporary closure of an underground storage tank (UST), it is crucial to seal specific openings to prevent leaks, contamination, and environmental hazards. The correct focus in this context is on sealing the fill and access locations. The fill location is where product is added to the tank, and sealing this ensures that no foreign substances can be introduced, which could compromise the integrity of the stored product. The access location is critical as it often provides a way to inspect and maintain the tank. By sealing this, the risk of contaminants entering the system is minimized. While vent locations are important for the operation of the UST during normal use, their sealing is not necessarily required during a temporary closure if the tank is designed to prevent backpressure and external contamination. However, filling and access locations are always prioritized in closure scenarios for safeguarding the contents and the surrounding environment. Thus, sealing both the fill and access locations is a vital step in the procedure for temporarily closing a UST.