Initial Isolation Distance
Initial Isolation Distance : "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. It is a distance (radius) which defines a circle (Initial Isolation Zone) within which persons may be exposed to dangerous concentrations upwind of the source and may be exposed to life threatening concentrations downwind of the source. For example, in the case of Compressed gas, toxic, n.o.s., ID No. 1955, Inhalation Hazard Zone A, the isolation distance for small spills is 600 meters, therefore, representing an evacuation circle of 1200 meters in diameter". (DOT, Emergency Response Guidebook, 2004, p. 2)
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