RMP WCS and “An enclosed space in direct contact with outside air” (UPDATED 11/7/13 w/ EPA Response)

An enclosed space in direct contact with outside air

Anyone who has submitted an RMP or maybe done a Worst Case Scenario (WCS) using EPA’s modeling software “RMP* Comp” will recognize this little checkbox at the bottom of the data page just above the SUBMIT button…

An enclosed space in direct contact with outside air

But when is this little checkbox, which can have a large impact on your scenario, allowed to be checked?  When should it be checked to be technically accurate?  I wish there was a way I could search the RMP database of those submittals that used RMP*Comp to see how many plans claimed this PASSIVE mitigation measure in their WCS; but since that is not possible I was wondering how many of you, in your RMP WCS, have claimed the WCS occurred in “enclosed space, in direct contact with outside air” when using RMP* Comp?

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