Natural Resources Defense Council, Inc., and the Sierra Club v. U.S. Environmental Protection Agency, and American Petroleum Institute, Intervenors. Conoco, Inc. v. U.S. Environmental Protection Agency, and Natural Resources Defense Council, Inc., Respondent-Intervenor. Bob Martinez, Governor, and Robert A. Butterworth, Attorney General, ] v. U.S. Environmental Protection Agency, and American Petroleum Institute, Respondents-Intervenors. American Petroleum Institute v. U.S. Environmental Protection Agency, and Natural Resources Defense Council, Inc., Respondent-Intervenor

863 F.2d 1420 28 ERC 1609 , 57 USLW 2375 , 19 Envtl. L. Rep. 20,225 NATURAL RESOURCES DEFENSE COUNCIL, INC., and the Sierra Club, Petitioners, v. U.S. ENVIRONMENTAL PROTECTION AGENCY, et al., Respondents, and American Petroleum Institute, et al., Intervenors. CONOCO, INC., Petitioner, v. U.S. ENVIRONMENTAL PROTECTION AGENCY, et al., Respondents, and Natural Resources Defense Council, Inc., Respondent-Intervenor. Bob MARTINEZ, Governor, * and Robert A. Butterworth, Attorney General, ** ] Petitioners, v. U.S. ENVIRONMENTAL PROTECTION AGENCY, et al., Respondents, and American Petroleum Institute, et al., Respondents-Intervenors. AMERICAN PETROLEUM INSTITUTE, et al., Petitioners, v. U.S. ENVIRONMENTAL PROTECTION AGENCY, et al., Respondents, and Natural Resources Defense Council, Inc., Respondent-Intervenor. Nos. 86-7390, 86-7563, 86-7631 and 86-7643. United States Court of Appeals, Ninth Circuit. Argued and Submitted Feb. 12, 1988. Decided Dec. 5, 1988. Ronald J. Wilson and Catherine A. Cotter, Washington, D.C., for petitioners Natural Resources Defense Council, Inc. and Sierra Club. Lee S. Schroer, E.P.A., Washington, D.C., and Scott Slaughter and Ashley Doherty, Dept. of Justice,…