Ill. Admin. Code tit. 35, pt. 845

Standards for the Disposal of Coal Combustion Residuals in Surface Impoundments

AUTHORITY: Implementing Sections 12, 22, and 22.59 of the Environmental Protection Act [415 ILCS 5/12, 22, and 22.59] and authorized by Sections 22.59, 27, and 28 of the Environmental Protection Act [415 ILCS 5/22.59, 27, and 28]. SOURCE: Adopted in R20-19 at 45 Ill. Reg. 5884, effective April 21, 2021; amended in R20-19A at 49 Ill. Reg. 8977, effective June 26, 2025; amended in R20-19B at 49 Ill. Reg. 13000, effective October 2, 2025.POLLUTION CONTROL BOARD

845.100Scope and Purpose 845.110Applicability of Other Regulations 845.120Definitions 845.130Surface Impoundment Identification 845.140Right of Inspection 845.150Incorporations by Reference 845.160Severability 845.170Inactive Closed CCR Surface Impoundments 845.200Permit Requirements and Standards of Issuance 845.210General Provisions 845.220Construction Permits 845.230Operating Permits 845.240Pre-Application Public Notification and Public Meeting 845.250Tentative Determination and Draft Permit 845.260Draft Permit Public Notice and Participation 845.270Final Permit Determination and Appeal 845.280Transfer, Modification and Renewal 845.290Construction Quality Assurance Program 845.300Placement Above the Uppermost Aquifer 845.310Wetlands 845.320Fault Areas 845.330Seismic Impact Zones 845.340Unstable Areas and Floodplains 845.350Failure to Meet Location Standards 845.400Liner Design Criteria for Existing CCR Surface Impoundments 845.410Liner Design Criteria for New CCR Surface Impoundments and Any Lateral Expansion of a CCR Surface Impoundment 845.420Leachate Collection and Removal System 845.430Slope Maintenance 845.440Hazard Potential Classification Assessment 845.450Structural Stability Assessment 845.460Safety Factor Assessment 845.500Air Criteria 845.510Hydrologic and Hydraulic Capacity Requirements for CCR Surface Impoundments 845.520Emergency Action Plan 845.530Safety and Health Plan 845.540Inspection Requirements for CCR Surface Impoundments 845.550Annual Consolidated Report 845.600Groundwater Protection Standards 845.610General Requirements 845.620Hydrogeologic Site Characterization 845.630Groundwater Monitoring Systems 845.640Groundwater Sampling and Analysis Requirements 845.650Groundwater Monitoring Program 845.660Assessment of Corrective Measures 845.670Corrective Action Plan 845.680Implementation of the Corrective Action Plan 845.700Required Closure or Retrofit of CCR Surface Impoundments 845.710Closure Alternatives 845.720Closure Plan 845.730Initiation of Closure 845.740Closure by Removal 845.750Closure with a Final Cover System 845.760Completion of Closure Activities 845.770Retrofitting 845.780Post-Closure Care Requirements 845.800Facility Operating Record 845.810Publicly Accessible Internet Site Requirements 845.900General Provisions 845.910Upgrading Financial Assurance 845.920Release of Financial Institution and Owner or Operator 845.930Cost Estimates 845.940Revision of Cost Estimates 845.950Mechanisms for Financial Assurance 845.960Trust Fund 845.970Surety Bond Guaranteeing Payment 845.980Surety Bond Guaranteeing Performance 845.990Letter of Credit