Witnesses: Tom Adams, Oxygenated Fuels Assoc.; Denise Chamberlain, Deputy Sec. for Air, Recycling, and Radiation Protection, PA Dept. of Environ. Protection; Bob Dinneen, Renewable Fuels Assoc.; A. Blakeman Early, Environ. Consult., Amer. Lung Assoc.; Robert Hirsch, Assoc. Dir. for Water, U.S.G.S.; Jeffrey Holmstead, Assist. Admin. for Air and Radiation, EPA; David Kahlenberg, Homeowner; Robert Kripowicz, Acting Assist. Sec. for Fossil Energy, DoE; Edward Murphy, Amer. Petroleum Inst.; Michael Ports, Ports Petroleum Co., Inc., on behalf of Nat. Assoc. of Convenience Stores and Soc. of Independent Gas. Marketers of Amer.; and John Stephenson, Natural Resources and Environ., GAO.