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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.

March 13, 1986 Time Frames for Determination of Applicability to New Source Review 2.23

Memo discusses the averaging time that EPA has agreed is the longest time frame that should be accepted as Federally enforceable for permit restrictions on production (hours of operation) which limit potential to emit to below major source or modification threshold. This policy is not to be extended to determi- nation of compliance with emission limitations. See April 8, 1987, memo from John Seitz for further clarification.

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