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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr/ for the latest information on EPA's New Source Review program.

October 21, 1986 Applicability of PSD to Portions of a Plant Constructed in Phases Without Permits 4.33

The memo discusses the applicability of PSD review to a minor source that becomes a major through a series of modifications. A BACT review applies only to the emissions units or modifications that define a major modification to an existing major source or a new major source unless the source has made a deliberate effort to circumvent review.

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