35 Ill. Adm. Code 106.606
Response and Reply
Section 106
Section 106.606 Response and
Reply
a) The Agency must file a response to a petition appealing a
determination of culpability within 21 days after service of the petition.
b) The Agency's response must contain, at a minimum, the basis of
its determination of the petitioner's culpability, including any
meteorological, monitoring, or sampling data upon which the determination was
made.
c) The petitioner may file a reply within 7 days after the
service of any response by the Agency.