The proposed rule development involves amendments to rule Chapter 62-296, F.A.C., to implement the reasonable progress portion of the U.S. Environmental Protection Agency’s (EPA’s) regional haze regulations. Pursuant to these regulations, the department is required to ensure that certain sources of visibility-impairing pollutants in Florida limit their emissions such that reasonable progress is made toward the goal of achieving natural visibility conditions in federal Class I areas. New Rule 62-296.341, F.A.C., is created to set forth procedural requirements by which reasonable progress determinations will be made for affected sources. There is no draft rule language available at this time; however, it is expected the department will post draft rule language at the following web site by June 6, 2007: http://www.dep.state.fl.us/Air/rules/regulatory.htm.