Initial Isolation and Protective Action Distances
Initial Isolation and Protective Action Distances : Two types of recommended safe distances listed in the U.S. Department of Transportation ERG 2000 for toxic inhalation hazard (TIH) substances, which are poisonous by inhalation and/or water-reactive materials, which produce toxic gases upon contact with water. The "Initial Isolation Distance" is a distance within which all persons should be considered for evacuation in all directions from the actual spill/leak source. The "Protective Action Distance" represents a downwind distance from the spill/leak source within which Protective Actions, those steps taken to preserve the health and safety of emergency responders and the public, could be implemented
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