What is the UST capacity threshold that does not require a site assessment at closure?

The UST capacity threshold that does not require a site assessment at closure is less than 110 gallons. This threshold aligns with regulatory standards that recognize smaller tanks, specifically those below this capacity, as presenting a lower risk for environmental contamination compared to larger installations. The reasoning behind this threshold is based on the idea that smaller tanks are typically less likely to discharge significant quantities of regulated substances, thus reducing the potential for harm to soil and groundwater.

In practice, this threshold helps streamline closure procedures for facilities that manage smaller tanks, minimizing unnecessary regulatory burden while still ensuring environmental safeguards for larger tanks that could pose a greater risk. Understanding this threshold is crucial for compliance with state regulations regarding underground storage tanks, allowing operators to effectively plan for the closure process without incurring additional costs or delays related to site assessments.