- Proposed Rule (PDF) (7 pp, 159 K, published August 24, 2009)
- Fact Sheet: Extension of the Summer Gasoline Volatility Standard to the DenverBoulder-Greeley-Fort Collins-Loveland, Colorado, 1997 8-hour Ozone Nonattainment Area (PDF)(2 pp, 184 K, August 2009, EPA-420-F-09-018)