Ill. Admin. Code tit. 35, § 845.210
b) Required Signatures of Owners or Operators
d) Previous Assessments, Investigations, Plans and Programs
3) For existing CCR surface impoundments, the owner or operator of the CCR surface impoundment may use a previously completed assessment to serve as the initial assessment required by Section 845.440 (Hazard Potential Classification Assessment), Section 845.450 (Structural Stability Assessment) and Section 845.460 (Safety Factor Assessment) provided that the previously completed assessment:
i) Agency Listserv