ADMINISTRATIVE CODE

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  3. TITLE 35: ENVIRONMENTAL PROTECTION
  4. PART 742 TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE G: WASTE DISPOSAL
CHAPTER I: POLLUTION CONTROL BOARD
SUBCHAPTER f: RISK BASED CLEANUP OBJECTIVES
PART 742 TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES
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SUBPART A: INTRODUCTION

Section 742.100 Intent and Purpose
Section 742.105 Applicability
Section 742.110 Overview of Tiered Approach
Section 742.115 Key Elements
Section 742.120 Site Characterization

SUBPART B: GENERAL

Section 742.200 Definitions
Section 742.205 Severability
Section 742.210 Incorporations by Reference
Section 742.215 Determination of Soil Attenuation Capacity
Section 742.220 Determination of Soil Saturation Limit
Section 742.222 Determination of Soil Vapor Saturation Limit
Section 742.225 Demonstration of Compliance with Soil and Groundwater Remediation Objectives
Section 742.227 Demonstration of Compliance with Soil Gas Remediation Objectives for the Outdoor and Indoor Inhalation Exposure Routes
Section 742.230 Agency Review and Approval

SUBPART C: EXPOSURE ROUTE EVALUATIONS

Section 742.300 Exclusion of Exposure Route
Section 742.305 Contaminant Source and Free Product Determination
Section 742.310 Outdoor Inhalation Exposure Route
Section 742.312 Indoor Inhalation Exposure Route
Section 742.315 Soil Ingestion Exposure Route
Section 742.320 Groundwater Ingestion Exposure Route

SUBPART D: DETERMINING AREA BACKGROUND

Section 742.400 Area Background
Section 742.405 Determination of Area Background for Soil
Section 742.410 Determination of Area Background for Groundwater
Section 742.415 Use of Area Background Concentrations

SUBPART E: TIER 1 EVALUATION

Section 742.500 Tier 1 Evaluation Overview
Section 742.505 Tier 1 Soil, Soil Gas and Groundwater Remediation Objectives
Section 742.510 Tier 1 Remediation Objectives Tables for the Ingestion, Outdoor Inhalation and Soil Component of the Groundwater Ingestion Exposure Routes
Section 742.515 Tier 1 Remediation Objectives Tables for the Indoor Inhalation Exposure Route

SUBPART F: TIER 2 GENERAL EVALUATION

Section 742.600 Tier 2 Evaluation Overview
Section 742.605 Land Use
Section 742.610 Chemical and Site Properties

SUBPART G: TIER 2 SOIL AND SOIL GAS EVALUATION

Section 742.700 Tier 2 Soil and Soil Gas Evaluation Overview
Section 742.705 Parameters for Soil Remediation Objective Equations
Section 742.710 SSL Soil Equations
Section 742.712 SSL Soil Gas Equation for the Outdoor Inhalation Exposure Route
Section 742.715 RBCA Soil Equations
Section 742.717 J&E Soil Gas Equations for the Indoor Inhalation Exposure Route
Section 742.720 Chemicals with Cumulative Noncarcinogenic Effects

SUBPART H: TIER 2 GROUNDWATER EVALUATION

Section 742.800 Tier 2 Groundwater Evaluation Overview
Section 742.805 Tier 2 Groundwater Remediation Objectives
Section 742.810 RBCA Calculations to Predict Impacts from Remaining Groundwater Contamination
Section 742.812 J&E Groundwater Equations for the Indoor Inhalation Exposure Route

SUBPART I: TIER 3 EVALUATION

Section 742.900 Tier 3 Evaluation Overview
Section 742.905 Modifications of Parameters
Section 742.910 Alternative Models
Section 742.915 Formal Risk Assessments
Section 742.920 Impractical Remediation
Section 742.925 Exposure Routes
Section 742.930 Derivation of Toxicological Data
Section 742.935 Indoor Inhalation Exposure Route

SUBPART J: INSTITUTIONAL CONTROLS

Section 742.1000 Institutional Controls
Section 742.1005 No Further Remediation Letters
Section 742.1010 Environmental Land Use Controls
Section 742.1012 Federally Owned Property: Land Use Control Memoranda of Agreement
Section 742.1015 Ordinances
Section 742.1020 Highway Authority Agreements and Highway Authority Agreement Memoranda of Agreement

SUBPART K: ENGINEERED BARRIERS

Section 742.1100 Engineered Barriers
Section 742.1105 Engineered Barrier Requirements

SUBPART L: BUILDING CONTROL TECHNOLOGIES

Section 742.1200 Building Control Technologies
Section 742.1205 Building Control Technology Proposals
Section 742.1210 Building Control Technology Requirements

Section 742.APPENDIX A General

Section 742.TABLE A Soil Saturation Limits (Csat) for Chemicals Whose Melting Point is Less than 30°C
Section 742.TABLE B Tolerance Factor (K)
Section 742.Table C Coefficient {AN-I+1} for W Test of Normality, for N=2(1)50
Section 742.TABLE D Percentage Points of the W Test for n=3(1)50
Section 742.TABLE E Similar-Acting Noncarcinogenic Chemicals
Section 742.TABLE F Similar-Acting Carcinogenic Chemicals
Section 742.TABLE G Concentrations of Inorganic Chemicals in Background Soils
Section 742.TABLE H Concentrations of Polynuclear Aromatic Hydrocarbon Chemicals in Background Soils
Section 742.TABLE I Chemicals Whose Tier 1 Class I Groundwater Remediation Objective Exceeds the 1 in 1,000,000 Cancer Risk Concentration
Section 742.TABLE J List of TACO Volatile Chemicals for the Indoor Inhalation
Section 742.TABLE K Soil Vapor Saturation Limits (Cvsat) for Volatile Chemicals

Section 742.APPENDIX B Tier 1 Illustrations and Tables <br>Section 742.ILLUSTRATION A Tier 1 Evaluation<br>Section 742.TABLE A Tier 1 Soil Remediation Objectivesa for Residential Properties

Section 742.ILLUSTRATION A Tier 1 Evaluation
Section 742.TABLE B Tier 1 Soil Remediation Objectivesa for Industrial/Commercial Properties
Section 742.TABLE C pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class I Groundwater)
Section 742.TABLE D pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class II Groundwater)
Section 742.TABLE E Tier 1 Groundwater Remediation Objectives for the Groundwater Component of the Groundwater Ingestion Route
Section 742.TABLE F Values Used to Calculate the Tier 1 Soil Remediation Objectives for the Soil Component of the Groundwater Ingestion Route
Section 742.TABLE G Tier 1 Soil Gas Remediation Objectives for the Outdoor Inhalation
Section 742.TABLE H Tier 1 Soil Gas and Groundwater Remediation Objectives for the Indoor Inhalation Exposure Route – Diffusion and Advectionj
Section 742.TABLE I Tier 1 Soil Gas and Groundwater Remediation Objectives for the Indoor Inhalation Exposure Route – Diffusion Onlyj

Section 742.APPENDIX C Tier 2 Illustrations and Tables

Section 742.TABLE A SSL Equations
Section 742.TABLE B SSL Parameters
Section 742.TABLE C RBCA Equations
Section 742.TABLE D RBCA Parameters
Section 742.TABLE E Default Physical and Chemical Parameterse
Section 742.TABLE F Methods for Determining Physical Soil Parameters
Section 742.TABLE G Error Function (erf)
Section 742.TABLE H Q/C Values by Source Area
Section 742.TABLE I Koc Values for Ionizing Organics as a Function of pH (cm3/g or L/kg or cm3water/gsoil)
Section 742.TABLE J Values to be Substituted for kd or ks when Evaluating Inorganics as a Function of pH (cm3/g or L/kg or cm3water/gsoil)
Section 742.TABLE K Parameter Estimates for Calculating Water-Filled Soil Porosity (?w)
Section 742.TABLE L J&E Equationsa
Section 742.TABLE M J&E Parameters

Section 742.APPENDIX D Highway Authority Agreement
Section 742.APPENDIX E Highway Authority Agreement Memorandum of Agreement
Section 742.APPENDIX F Environmental Land Use Control
Section 742.APPENDIX G Model Ordinance
Section 742.APPENDIX H Memorandum of Understanding
AUTHORITY: Implementing Sections 22.4, 22.12, Title XVI, and Title XVII and authorized by Sections 27 and 58.5 of the Environmental Protection Act [415 ILCS 5/22.4, 22.12, 27, and 58.5 and Title XVI and Title XVII].
SOURCE: Adopted in R97-12(A) at 21 Ill. Reg. 7942, effective July 1, 1997; amended in R97-12(B) at 21 Ill. Reg. 16391, effective December 8, 1997; amended in R97-12(C) at 22 Ill. Reg. 10847, effective June 8, 1998; amended in R00-19(A) at 25 Ill. Reg. 651, effective January 6, 2001; amended in R00-19(B) at 25 Ill. Reg. 10374, effective August 15, 2001; amended in R00-19(C) at 26 Ill. Reg. 2683, effective February 5, 2002; amended in R06-10 at 31 Ill. Reg. 4063, effective February 23, 2007; amended in R11-09 at 37 Ill. Reg. 7506, effective July 15, 2013; amended in R25-23 at 49 Ill. Reg. 12746, effective September 23, 2025.