When must any active permits for temporarily closed tanks be returned to the department?

The requirement to return any active permits for temporarily closed tanks within 30 days of completion of closure activities is established to ensure that the regulatory agency maintains accurate records of tank statuses and compliance with safety and environmental regulations. This timeframe allows for the necessary administrative processing and ensures that all activities associated with the closure are documented effectively.

Timely return of permits is crucial because it helps prevent misunderstandings about the tanks’ statuses and supports the monitoring of potential environmental impacts. By setting the 30-day requirement, agencies can facilitate a more organized transition from operational to closed status, making it easier to manage ongoing safety and compliance obligations related to the site.

The other options may suggest shorter or longer timeframes that do not align with the regulatory requirements aimed at ensuring proper handling of closed tank permits. A clearly delineated period helps streamline processes and reinforces accountability in the management of UST systems.