entech. WKP Magazine Explosion Simulation – Gas Dispersal Study P a g e | 14 in concentration relates to the delay in fumes taking the northern exhaust route. Figure 4-2 – Gas concentration in ppm over time, exhausting Rise 1. Under summer conditions, natural pressure changes in the mine sees NO2 exhausting at safe levels within 13 hours of the explosion. Residual gases clear within two and a half days. Figure 4-3 – Gas concentration in ppm over time, exhausting Plant Portal.
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