Release Closure Criteria

Closure of a release event and issuance of an NFA (No Further Action) determination is based on the risk of exposure to any remaining contamination via the exposure pathways.

OPS has developed a four-tiered closure approach for petroleum releases.

The information provided below is intended to assist in the evaluation of a release event based on risk to human health and the environment. Click on the arrows for more information.

Colorado Division of Oil and Public Safety

633 17th Street, Suite 500, Denver, CO 80202

Phone: 303-318-8525


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