The EPA Risk Management Plan (RMP) defines a worst-case scenario as the catastrophic release of the entire process inven

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The EPA Risk Management Plan (RMP) defines a worst-case scenarioas the catastrophic release of the entire process inventory in a10­min period (assumed to be a continuous release). The dispersioncalculations must be performed assuming F stability and 1.5 m/swind speed. As part of the RMP rule, each facility must determinethe downwind distance to a toxic endpoint. These results must bereported to the EPA and to the surrounding community. A plant has a100­lb tank of anhydrous hydrogen fluoride. The toxic endpoint isspecified in the RMP as 0.016 mg/L. Consider the EPA worst­ caserelease scenario described above (assume rural conditions) andconsider in particular the footprint of the toxic cloud at groundlevel.
(1) Determine the size of the toxic cloud in the downwinddirection.
(2) Determine the maximum thickness of the toxic cloud in thecrosswind direction