Frontier Oil Corp. ( plans to fight a $6.8 million environmental penalty against its Cheyenne, Wyoming refinery, according to a report by the Wyoming Tribune Eagle (

The U.S. Environmental Protection Agency cited Frontier Refining for the illegal storage of hazardous waste in a wastewater management pond. The EPA claims the pond was not constructed or operated properly to prevent or detect leaks. Meanwhile, the Tribune Eagle reports that Frontier executives claim there is a misunderstanding on the intended use of the pond.

According to the Tribune Eagle, the EPA is also looking at wastewater pond misuse at refineries nationwide.

To read the Wyoming Tribune Eagle’s full report on this story, click here.