If a petition for review is filed before the Illinois Pollution Control Board to contest an administrative citation issued under subsection (b) of this Section, the Agency shall appear as a complainant at a hearing before the Illinois Pollution Control Board to be conducted in accordance with the requirements of Section 32 of the Environmental Protection Act at a time not less than 21 days after notice of the hearing has been sent by the Illinois Pollution Control Board to the Agency and the individual named in the citation. In these hearings, the burden of proof shall be on the Agency. If, based on the record, the Illinois Pollution Control Board finds that the alleged violation occurred, it shall adopt a final order, which shall include the administrative citation and findings of violation as alleged in the citation, and shall impose the penalty specified in subsection (f) of this Section. However, if the Illinois Pollution Control Board finds that the individual appealing the citation has shown that the violation resulted from uncontrollable circumstances, the Illinois Pollution Control Board shall adopt a final order that makes no finding of violation and imposes no penalty.
415 ILCS 45/23.1