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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.

January 12, 1989 Guidance on Several Issues Related to Determining Applicability of New Major Source Regulations in the Granting of Construction Permits to Sources of Air Emissions 3.33

Memo provides guidance on several issues related to determining applicability of major source regulations in granting construction permits to modified sources.
  1. A reviewing agency must base determination of whether a source is "major" on "major" source definitions in the Federal Register.

  2. Whether the emissions increase related to a modification is significant is determined before any netting calculation is done. If it is, netting calculations are then performed to determine whether the "net emissions increase" associated with that modification is significant.

  3. Contemporaneous emissions increases and decreases are discussed, as well as other factors affecting whether they are "creditable".

  4. An example of a netting calculation is shown. Emissions increases or decreases used in issuing previous major source permit cannot be creditable to a subsequent increase.

Notebook Entries: 4.40; 23.30

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