Sierra Club; Headwaters, Inc.; Forest Conservationcouncil; and Oregon Natural Resources Council,plaintiffs-appellees, v. Bruce Babbitt, Secretary, U.S. Department of Interior, Defendant,andseneca Sawmill Company, an Oregon Corporation,defendant-intervenor-appellant.sierra Club, Plaintiff-appellee, v. Bruce Babbitt, Defendant-appellant.sierra Club, Plaintiff-appellant, v. Bruce Babbitt, Defendant-appellee,andseneca Sawmill Company, an Oregon Corporation,defendant-intervenor-appellee