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July 28, 1983 PSD Applicability Pulp and Paper Mill 4.27

A pulp and paper company is proposing to install a bleaching plant and a larger digester. These units will not cause increased emissions, but emissions from the recovery boiler will increase above significant levels because of this construction. Emissions will remain below maximum design permit levels. PSD is applicable. The recovery boiler's proposed operating rate is higher than that provided by the existing digester capacity, and so any increase in actual emissions from the recovery boiler which results from the increased capacity provided by the larger digester must be considered for PSD applicability. If there is a significant net increase, the PSD requirements should be applied, although the boiler will not have to apply BACT because it will not itself be undergoing a physical change or change in the method of operation.

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