What is the maximum capacity for a UST to be regulated under the UST program?

The correct response indicates that an Underground Storage Tank (UST) must have a capacity of 110 gallons or more to fall under the regulations of the UST program. This threshold reflects regulatory standards aimed at ensuring environmental protection and management of larger tanks that store potentially hazardous substances. Tanks below this capacity typically pose a lower risk of significant soil or groundwater contamination and are consequently exempt from many regulatory requirements placed on larger tanks.

In practice, UST programs are designed to monitor and manage risks associated with larger storage volumes, as these can have more severe environmental implications in the event of leaks or failures. Thus, the capacity of 110 gallons establishes a clear regulatory boundary for tanks that require oversight to mitigate potential environmental hazards effectively.