A release is defined as fuel escaping into soil or groundwater due to a failure of the UST system.

A release is defined as fuel escaping into soil or groundwater due to a failure of the UST system.

• A. A spill on the surface
• B. Fuel leaking within the tank
• C. A release to soil or groundwater
• D. Contamination of air

Answer: (C)

The essential idea is that a release means fuel escaping from the underground storage tank system and entering soil or groundwater as a result of a system failure. A spill on the surface isn’t tied to the UST malfunction and doesn’t automatically become groundwater contamination. Fuel leaking inside the tank isn’t an environmental release at all—it’s a leak within the tank itself, not fuel reaching the surrounding environment. Contamination of air involves vapors, not soil or groundwater. So the description that matches the definition is fuel that escapes to soil or groundwater because the UST system failed.

The essential idea is that a release means fuel escaping from the underground storage tank system and entering soil or groundwater as a result of a system failure. A spill on the surface isn’t tied to the UST malfunction and doesn’t automatically become groundwater contamination. Fuel leaking inside the tank isn’t an environmental release at all—it’s a leak within the tank itself, not fuel reaching the surrounding environment. Contamination of air involves vapors, not soil or groundwater. So the description that matches the definition is fuel that escapes to soil or groundwater because the UST system failed.