What is a common regulation requirement before UST decommissioning?

Before decommissioning a UST (Underground Storage Tank), it is essential to notify regulatory authorities. This step is critical because regulatory bodies need to be aware of the changes in tank status, especially regarding the potential environmental impacts. Notifying them helps ensure that all procedures comply with local, state, and federal regulations aimed at protecting public health and the environment. Furthermore, such notification allows for appropriate oversight, which can include subsequent inspections or requiring specific documentation to ensure the decommissioning is carried out safely and effectively.

The other options do not typically fall under the common regulatory requirements for tank decommissioning. For instance, painting the tank or conducting a full inventory check, while they may be good practices in some contexts, are not mandated regulatory steps for the decommissioning process. Keeping the tank filled is contrary to best practices, as empty tanks are often required before decommissioning to prevent potential leaks and other environmental hazards.