At least ___ prior to permanently closing a UST, the owner/operator must submit written notification of the intent to close the UST to the DEQ.

• A. 30 days
• B. 60 days
• C. 90 days
• D. 120 days

Answer: (A)

The key requirement is that written notification of the intent to permanently close an underground storage tank must be submitted to the DEQ at least 30 days before the closure. This minimum lead time gives the agency time to review the plan, coordinate any needed inspections, and verify that the tank, piping, and any residual contents are handled properly to prevent environmental releases. It also ensures there’s a formal record of the closure and helps address any contamination concerns before the tank is removed or decommissioned. Longer notice periods, such as 60, 90, or 120 days, would still satisfy the requirement, but they are not the minimum stated.