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The Colorado Department of Labor and Employment's Division of Oil and Public Safety determined that contaminated fuel sold in the Denver metro area in January was due to human error. An improperly left open valve allowed diesel to contaminate approximately 365,694 gallons of gasoline at Sinclair's Denver Product Terminal on January 7.

This led to 1,090 customer complaints and a total contamination of about 2.5 million gallons. A Notice of Violation was issued to HF Sinclair with a $365,694 fine. Following the incident, Sinclair committed to implementing a two-person verification process for pipeline transfers.