At least ______ prior to closing the UST, the owner/operator must notify the DEQ of the intent to close the UST.

• A. 15 days
• B. 30 days
• C. 60 days
• D. 90 days

Answer: (B)

Notifying the DEQ at least 30 days before closing the UST ensures the agency has adequate time to review the closure plan, check for any releases, and verify that the closure is carried out safely and in compliance. This lead time allows for regulatory processing, any required inspections, and proper documentation of the closure. The 30-day minimum is the standard requirement to coordinate a safe, orderly closure; shorter notice would not give enough time for proper review, while longer periods aren’t required by this rule. Acting with this notice helps prevent delays and potential penalties while protecting soil and groundwater.