- At least 10 days prior to placing a UST in temporary closure, the owner/operator must notify OPS in writing of the intent to close the UST. The owner/operator must also maintain records documenting the previous 12 months of release detection and corrosion protection testing. The owner/operator must continue operation and maintenance of corrosion protection and, unless the tank is empty (e.g., product is removed to less than one inch), release detection equipment.
- If the UST system remains in temporary closure for three months or more, the owner/operator must also leave the vent lines open and functioning, and cap and secure all other lines, pumps, manways, and ancillary equipment.
- The owner/operator must notify OPS no more than 30 days prior to placing a UST back in service using the Notice of Intent to Place Underground Storage Tanks Back Into Service form, and submit proof of passing tank and line tightness tests conducted within the previous 30 days.
Return to Service
Owners/operators must notify OPS in writing no more than 30 days prior to placing a UST back in service and submit documentation of passing tightness tests, including ullage, for the tank and lines conducted within the last 30 days.
If a UST is temporarily closed for more than twelve months, the owner/operator must:
- Permanently close the tank;
- Conduct a site assessment and apply for an extension using the Notice of Intent to Place Underground Storage Tanks into Temporary Closure or Extension Request form; or
- Place the tank back into service.
At least 10 days prior to permanently closing the UST, the owner/operator must submit written notification of the intent to close the UST to OPS using the Permanent Closure or Change-in-Service
form. A new Notification for Underground Storage Tanks form must be submitted to OPS as well.