The purpose of this appendix is to provide an overview of the range of health-based exposure guidelines that may be used by risk managers during the operational phases of response and recovery to a nationally significant or large-scale chemical incident. This appendix provides descriptions of a number of health-based exposure guidelines based on short-term and long-term exposure durations. As many health-based exposure guidelines have been developed by governmental and professional organizations for different purposes, this appendix provides background information to assist in selecting the appropriate type of value for addressing contamination of air, soil, surfaces, and drinking water, and in understanding how those exposure guidelines may be best used. The information provided in this appendix is intended to facilitate the selection of the most appropriate values for planning and response decisions in the context of a nationally significant or large-scale release of a hazardous chemical.
The values described in this appendix may change in the future. Therefore, users should confirm the validity of the values prior to use in an incident.