Protection of Environment. Part63:National emission standards for hazardous air pollutants for source categories (continued). Section63.1428:Process vent requirements for group determination of PMPUs using a nonepoxide organic HAP to make or modify the pr
(a) Process vents from batch unit oper-ations. The owner or operator shall de-termine, for each PMPU located at an affected source, if the combination of all process vents from batch unit oper-ations that are associated with the use of nonepoxide organic