EPA-approved plans can be revised only with approval by the Administrator. The Administrator will approve a plan revision if it is satisfactory with respect to the applicable requirements of this subpart and any applicable requirements of subpart Ba of this part, including the requirements in §60.5740a. If one (or more) of the elements of the plan set in §60.5735a require revision, a request must be submitted to the Administrator indicating the proposed revisions to the plan.