What is a consequence of improperly closing a UST that is no longer in use?

When a underground storage tank (UST) is improperly closed, one of the primary consequences is the significant risk of leaks and the subsequent penalties that may arise from regulatory non-compliance. When a UST is no longer in use, it is crucial to follow established procedures for closure to ensure that any remaining fuel or hazardous materials do not escape from the tank and contaminate the surrounding environment. If a tank leaks, it can lead to soil and groundwater contamination, posing serious environmental and health risks. Regulatory agencies often impose strict penalties on facilities that do not comply with closure regulations, further complicating the situation.

The other options do not accurately reflect the implications of improper closure. For instance, future relocation ease and reduced operational costs are not benefits associated with failing to properly close a UST. Instead, improper closure could lead to increased costs associated with cleanup and legal fines. Similarly, while increased safety measures might be a response to a leak or incident, they do not arise as a direct consequence of improper closure; rather, they highlight the importance of correctly managing existing risks.