40 CFR 46.220: Disputes.

(a) If you and the EPA award official or project officer have a disagreement, you should make reasonable efforts to resolve it at that level.

(b) If you cannot reach agreement, an EPA disputes decision official will provide a written final decision. The EPA disputes decision official is the individual designated by the award official to resolve disputes concerning assistance agreements. The dispute procedures outlined at 2 CFR part 1500 subpart E, will apply.