Which action is required at closure of a UST to protect the remaining facility?

• A. Remove all equipment
• B. Disable the monitoring system
• C. Abandon the tank in place
• D. Not remove or fill

Answer: (D)

The action being tested is about keeping the remaining facility protected by avoiding unnecessary disturbance during closure. Not removing or filling the tank preserves the existing containment and minimizes changes to the site that could release or spread contaminants or create new hazards. It keeps the closure process from introducing new release pathways while proper procedures and regulatory steps are followed under the closure plan.

Removing equipment or abandoning the tank in place would disturb the site and potentially leave hazards behind. Disabling the monitoring system would remove a critical safety measure for detecting leaks or releases. By not removing or filling, the closure action aligns with maintaining the integrity of the remaining facility while a compliant, thorough decommissioning plan is implemented.