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EPA's Region 6 Office

Serving: Arkansas, Louisiana, New Mexico, Oklahoma, Texas, and 66 Tribal Nations

Human Health Risk Assessment Protocol for Hazardous Waste Combustion Facilities
**Final September 2005**

Risk assessment is a science used to evaluate the carcinogenic risks and noncarcinogenic hazards to human health that are attributable to emissions from hazardous waste combustion units. These risk assessments include the evaluation of both direct and indirect risks. There is sufficient guidance available regarding the performance of direct inhalation risk assessments. On the other hand, indirect risk assessments are newer and more complex. As a result, this document describes the evaluation of direct inhalation risk, but primarily focuses on the procedures used to estimate risk resulting from indirect pathways.

This document is organized into nine chapters, three appendices, and a Region 6 Risk Management Addendum as follows:

Volume 1: Human Health Risk Assessment Protocol for Hazardous Waste Combustion Facilities

Volume 2:
Appendix A: Chemical-specific Data [495 kb PDF] and
Appendix B: Estimating Media Concentration Equations and Variable Values [1665 kb PDF]
Appendix C: Risk Characterization Equations [389 kb PDF]

Methodology for Predicting Cattle Biotransfer Factors [154 kb PDF]
Appendix A: Procedure for Extrapolating Steady State Concentrations [195 kb PDF]
Appendix B: Evaluation of the Molecular Connectivity Index [195 kb PDF]
Appendix C: Chemical Structures [195 kb PDF]
Appendix D: Feeding Study Data as Reported [795 kb PDF]
Appendix E: Normalized Beef and Milk Concentration Data [776 kb PDF]
Appendix F: Data Review [776 kb PDF]

U.S. EPA Response to Comments on the Human Health Risk Assessment Protocol for Hazardous Waste Combustion Facilities [591 kb PDF]

Addendum: Region 6 Risk Management Addendum - Draft Human Health Risk Assessment Protocol for Hazardous Waste Combustion Facilities [41 kb PDF, 8/1998]

Download HHRAP Companion Database [MSAccess Database File, 3,312 KB PDF]

The above files are in PDF Format. To get a free copy of the PDF Reader click here. Exit EPAAfter downloading the PDF reader to your computer, click on any pdf file, and tell the browser the path to the acroread.exe file that was downloaded from Adobe's Web Page.

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