A settling CAA defendant responsible for vapor leaks from hydrocarbon liquid storage tanks in Boulder, Broomfield, and Weld counties, Colorado, must pay a $4.95 million civil penalty to the United States and Colorado, must complete two supplemental environmental projects at a cost of no less than $2 million and at least $4.5 million to complete five environmental mitigation projects, and must perform engineering evaluation and corrective actions of its vapor control system as needed.