Except as provided in subsections (a) and (b), the Board will conduct a public hearing, in accordance with 35 Ill. Adm. Code 101.Subpart F, upon an appropriately filed petition for review under this Subpart. The hearing and decision of the Board shall be based exclusively on the Agency record at the time the permit or decision was issued, unless the parties agree to supplement the Agency record. Any PSD permit issued by the Agency must be upheld by the Board if the technical decisions contained in the permit reflect considered judgment by the Agency. [415 ILCS 5/40.3(d)(1)]
Ill. Admin. Code tit. 35, § 105.614