The owner or operator of an emission source or air pollution control equipment subject to an approved compliance program and project completion schedule may request a revision of such program or schedule at any time. In addition, the Agency may require a revision upon any change in the Act or this Chapter. The Agency shall not approve any revision which contains a final compliance date later than the applicable date prescribed in Subchapter c of this Chapter.
Ill. Admin. Code tit. 35, § 201.244