Notify the Division of Oil and Public Safety in writing at least 10 days before beginning either permanent closure or change-in-service of an aboveground (AST) or underground (UST) storage
tank but preferably not more than 30 days. The
closure notice (Forms) can be sent via e-mail, by mail, or by fax. Many local fire departments also require advance notice of tank closure. It is advisable to contact your local fire department prior to closure to ensure you comply with its requirements.
Permanent closure of a UST can be accomplished by either removing the tank or by filling it with an inert substance. Permanent closure of an AST can be accomplished by removing the tank or by safeguarding it pursuant to the regulations. Change-in-service for a UST or AST means continued use of the tank to store a non-regulated substance. Notification is not required if the change is from one
regulated product to another, such as from gasoline to diesel.
Permanent closure or change-in-service of a UST or an AST requires that the tank be emptied and cleaned and that a site assessment be conducted. If a release or suspected release (contaminated soil, contaminated groundwater, free product, or vapors) is discovered, it must be reported to the
Division of Oil and Public Safety within 24 hours. The release or suspected release must be investigated and confirmed
within 7 days. If necessary, further assessment and remediation activities must be conducted.
Retain closure records for at least three years. You may either keep them on site or transfer them to the
Division of Oil and Public Safety's office.
If contamination is found at closure, retain records until the contamination is fully remediated, a site closure letter is issued by the
Division of Oil and Public Safety, and all costs have been submitted and fully processed for reimbursement from the Petroleum Storage Tank Fund, even if this exceeds
three years.
Report contamination on the
Site Characterization Report
(Form) provided by the Division of Oil and Public Safety.
If no contamination is discovered, you are not required to notify the
Division of Oil and Public Safety of that fact unless you want to receive site closure. If you do, complete and submit the
No Further Action Report
(Form).
Please refer to
Colorado's Petroleum Storage Tank Regulations for more details on tank closure or change-in-service, site assessment, release reporting, release investigation, remediation, and record keeping requirements.
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To report a suspected or confirmed release
discovered at closure or change-in-service, call The Division of Oil and Public Safety
Technical Assistance line: 303-318-8547. |
