Underground Storage Tank (UST) Designated Operator A Certification Practice Test

When an underground storage tank (UST) is taken out of service, it is essential to follow specific regulatory guidelines to prevent environmental contamination and ensure safety. The requirement to properly empty, clean, and either remove or close the tank in place is critical for several reasons.

First, emptying and cleaning the tank reduces the risk of any residual product or hazardous materials causing groundwater or soil contamination. Cleaning the tank helps eliminate any remaining petroleum products or chemicals that could pose environmental hazards.

Second, when it comes to closing a UST, doing so according to regulations ensures that the closure is done safely and adequately. If a tank is closed in place, it must be filled with inert materials, like foam or a similar substance, and sealed effectively to prevent leakage.

These steps protect public health and the environment and are mandatory to comply with local and federal regulations. Therefore, following the proper procedures for decommissioning USTs is a critical responsibility of designated operators.