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cloud to move more slowly.

6. Figure E-3 shows the results of the simulation assuming the
chlorine tank has ruptured. The shaded portions of the figure
again represent areas where the concentration is 25 ppm or
greater. If this incident occurs during the day, the lethal cloud
extends 3 km downwind (north-northwest in the figure). Figure E-4
shows that if this incident occurs at night, the cloud extends 22
km downwind. Thus, depending on wind direction, the nighttime
scenario threatens the camp area or the port. These results are
independent of the amount of chlorine originallyin the tank. The
plume persists until all of the chlorine evaporates.

7. These results suggest that the most harmful scenario with
regard to rupturing of the tank is at night. The lower windspeed
at this time results in less dispersion of the gas.


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