The Administrator may take appropriate action in the case of any individual who is found in violation of the statutory or regulatory post employment restrictions after a final decision by:

(a) Prohibiting the individual from making, on behalf of any other person (except the United States), any formal or informal appearance before, or with the intent to influence, any oral or written communication to, the Agency on any matter of business for a period not to exceed five years, which may be accomplished by directing Agency employees to refuse to participate in such appearance or to accept any such communication; and

(b) Taking other appropriate disciplinary action.