What constitutes a "release" from a UST?

A "release" from an underground storage tank (UST) is characterized by an uncontrolled loss of regulated substances. This scenario typically occurs when there is a failure in the tank system, such as a leak or a rupture, which allows contents to escape into the environment. Understanding this definition is crucial as it highlights the importance of monitoring and maintaining USTs to prevent potential environmental contamination and health risks.

The concept of a "release" is important for compliance and reporting purposes. Whenever there's an uncontrolled loss, it must be immediately addressed and reported as part of environmental safety regulations. This definition emphasizes the necessity for operators to be vigilant in their daily inspections and routine maintenance to identify any signs of potential releases before they occur.

In contrast, a controlled loss during maintenance refers to intentional and managed procedures during which substances are either drained or transferred, such as during repairs or when taking the tank out of service. This situation does not constitute a "release" since it is expected and typically managed safely.

Transferring substances to a delivery vehicle relates to the operational practice of delivering fuel and is also not considered a "release," as the process is carefully monitored and executed under regulated conditions.

Periodic testing of the tank is a preventive measure meant to detect leaks before they become releases