摘要: |
This report provides technical documentation on the values chosen for the Table of Initial Isolation and Protective Action Distances (PADs) in the 2008 Emergency Response Guidebook (ERG2008). The goal was to choose PADs that would balance the need to adequately protect the public from exposure to potentially harmful substances against the need to minimize the risks and expenses that could result from overreacting to an incident involving the release of hazardous materials that are toxic by inhalation (TIH). To quantify this balance, a statistical approach was adopted, in which the best available information was used to conduct an accident scenario analysis and develop a set of up to 1,000,000 hypothetical incidents for each material in the Table. Each set accounts for differences in container types, incident types, accident severities (i.e., amounts released), locations, times of day, times of year, and meteorological conditions. |