((a)) The President, by and with the advice and consent of the Senate, may appoint three Assistant Administrators of the Environmental Protection Agency in addition to—

((1)) the five Assistant Administrators provided for in section 1(d) of Reorganization Plan Numbered 3 of 1970 (5 U.S.C. Appendix);

((2)) the Assistant Administrator provided by ; and

((3)) the Assistant Administrator provided by .

((b)) Each Assistant Administrator appointed under subsection (a) shall perform such duties as the Administrator of the Environmental Protection Agency may prescribe.