The violations are the result of a May 2013 OSHA inspection which stemmed from an employee complaint and several gas releases that Sinclair voluntarily reported to DWS OSHA in May of 2013.

Wyoming Department of Workforce Services director Joan Evans said, "The OSHA investigation revealed a variety of hazards present at the site, along with repeat violations."

"Progress has been made since this inspection to address safety issues at the refinery and Wyoming OSHA will continue to work with the employer to prevent and address hazards," Evans added.

Wyoming OSHA is currently conducting an investigation into an incident that occurred in September.

During the inspection, OSHA found conditions that merit six willful violations. A willful violation is defined as a situation in which the employer either knowingly failed to comply with a legal requirement (purposeful disregard) or acted with plain indifference to employee safety.