IRAP-h View fully implements the latest U.S. EPA guidance for evaluating risk from emission sources: the 1998 U.S. EPA - OSW Human Health Risk Assessment Protocol (HHRAP).  The protocol is available below - please note that all files are in PDF format and require Adobe Acrobat Reader to view and print.

Human Health Risk Assessment Protocol

Chapter 1: (513kb) Introduction with objectives and purpose, related Trial Burn issues, reference documents and organization of remainder of document.

Chapter 2: (1180kb) Facility Characterization discussing compiling basic facility information, identifying emission sources, estimating emission rates, identifying compounds of potential concern (COPCs), estimating COPC concentrations for non-detects and evaluating contamination in blanks.

Chapter 3: (260kb) Air Dispersion and deposition Modeling with recommended models, site-specific characterization, use of unit emission rate, partitioning of emissions, meteorological data requirements, meteorological preprocessors , ISCST3 model input files, ISCST3 model execution, use of modeled output, modeling fugitive emissions and modeling acute risk.

Chapter 4: (82kb) Exposure Scenario Identification with exposure setting characterization, recommended exposure scenarios and exposure scenario locations.

Chapter 5: (684kb) Estimation of Media concentrations with calculation of COPC concentrations in air, soil, produce, beef and dairy products, pork, chicken and eggs and drinking water and fish.

Chapter 6: (60kb) Quantifying Exposure with generic exposure rate equations, consumption rate, exposure frequency and duration, averaging time and body weight.

Chapter 7: (64kb) Risk and Hazard Characterization with individual risk and hazard estimation, quantitative estimation of cancer risk, quantitative estimation of noncancer effects, target levels and acute exposure resulting from direct inhalation.

Chapter 8: (37kb) Uncertainty Interpretation for Human Health Risk Assessment with uncertainty and limitations of the risk assessment, types of uncertainly, qualitative estimates of uncertainty, quantitative estimates of uncertainty and risk assessment uncertainty discussion.

Chapter 9: (19kb) Completion of Risk Assessment and Follow-On Activities with conclusions and activities following risk assessment completion.

References: (78kb) References used in this document.

Appendix A - Chemical-specific Data

Appendix A-1: (295 kb) Chemicals for Consideration as Compounds of Potential Concern

Appendix A-2: (49 kb) Target organs and Critical Effects for Constituents with Reference Doses

Appendix A-3: (3394 kb) Compound Specific Parameter Values

Appendix A-4: (34 kb) Acute Inhalation Exposure Criteria

Appendix B to H

Appendix B: (1281kb) Estimating Media Concentration Equations and Variable Values

Appendix C: (219kb) Risk Characterization Equations

Region 6 Risk Management Addendum

Addendum: (142 kb) Region 6 Risk Management Addendum - Draft Human Health Risk Assessment Protocol for Hazardous Waste Combustion Facilities

Errata: (41 kb) This errata presents corrections to errors that EPA has found with the protocol. These corrections should be used in conjuction with the guidance.