Ill. Admin. Code tit. 35, § 820.306
a) Within 45 calendar days after completing closure activities, the owner or operator of a GCDD recovery facility must submit to the Agency:
b) Under Section 39(a) of the Act, when the Agency determines, based on information received under subsection (a) and any Agency site inspection, that the GCDD recovery facility has been closed in compliance with the requirements of the Act and this Part, the Agency must notify the owner or operator in writing that: