Explain what makes a UST “non-operational.”

A UST (Underground Storage Tank) is considered “non-operational” when it is not in use for the storage of product and is also not maintained in a compliance-ready state. This means that the tank is not actively holding fuel or other materials and lacks the necessary upkeep to ensure safety and environmental compliance. Non-operational tanks can pose significant risks, such as leaks or contamination, because they are not being monitored or maintained to meet regulatory standards.

In contrast, other options refer to scenarios that do not directly define a non-operational status. Temporary storage solutions might indicate a lack of permanence but do not automatically classify the tank as non-operational. Improper installation raises concerns about functionality and safety but does not directly relate to the current operational status. Lastly, routine maintenance ensures that a tank remains operational and compliant; therefore, it does not contribute to a tank's non-operational status.