Environmental protection agency Vows to clean up hazardous waste dump sites. RMN My 1, 1979 p.4 Roger L. Williams named director of Rocky Mountain region. Post Ag 8, 1979 p.3 RMN Ag 9, 1979 p.4 Alan Herson to step down next week as regional administrator of EPA. RMN Ag 18, 1979 p.4, New administrator, Roger L. Williams, outlines priorities Post S 22, 1979 .2 National Wildlife Federation sues EPA over leniency of clean air plan for Denver. RMN D 12, 1979 p,8