In this direct final action, EPA is approving the State of Colorado's request to relax the federal Reid Vapor Pressure ("RVP") gasoline standard that applies to gasoline supplied to the Denver/ Boulder area (hereafter "Denver area") from June 1st to September 15th (the ozone control season) of each year. This action amends our regulations to change the summertime RVP standard for the Denver area from 7.8 pounds per square inch ("psi") to 9.0 psi. EPA has determined that this change to our federal RVP regulations is consistent with criteria EPA has enumerated for making such changes: that the State has demonstrated it has sufficient alternative programs to attain and maintain the National Ambient Air Quality Standards for ozone; and that amendments are appropriate to avoid adverse local economic impacts.