HF Sinclair has provided regulators with the state’s Division of Oil and Public Safety a preliminary report on the cause of the Jan. 7 contaminated fuel fiasco that impacted more than 1,000 motorists, but the investigation is still weeks from completion.

On Jan. 7, motorists from Colorado Springs to Fort Collins filled their gas tanks with gasoline contaminated with diesel. More than 50 stations were impacted, including large retailers like Costco, Kings Soopers, Safeway and independent gas stations alike.

The Denver Gazette filed a Colorado Open Records Act request with the Division of Oil and Public Safety to obtain the report but officials declined, citing the exemption for records still under active investigation.

They estimated a final report, including enforcement actions, could be released by the end of February, according to a spokesperson. Investigators are on-site taking samples and more meetings with HF Sinclair are planned. The state has the statutory ability to fine the company.

HF Sinclair did not respond to The Denver Gazette’s emailed request for comment.

Many of the cars had to be towed to repair shops, and repair fees ranged from several hundred to thousands of dollars.

A class-action lawsuit was filed by Berger Montague PC, a California-based firm, on behalf of Charlene Franklin and “all others similarly situated.” It alleges up to 400,000 gallons of fuel may have been affected.

It names defendants HF Sinclair Corp. and Dillon Companies LLC doing business as King Soopers Fuel Centers. It alleges negligence, breach of implied warranty of merchantability, breach of implied warranty of fitness for a particular purpose and a violation of Colorado’s Consumer Protection Act.