Linn County Air Quality Division
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Additional Storm Recovery Permitting Guidance

August 19, 2020

As Linn County continues to recover from the August 10, 2020 derecho, facilities will likely have lots of questions about which repairs and replacements may require air quality permits.  In general, when a facility repair matches the parameters outlined on the existing air permit, a modification or construction permit application will not be required.  In the event that the repair does not match the parameters outlined on the existing permit, the Air Quality Branch will be using the  Air Construction Permit Modification Fact Sheet to determine whether a modification or construction permit application is required.  

This fact sheet is existing guidance that outlines common scenarios under which a permit modification may be necessary.  While this guidance was originally issued with the purpose of providing answers to premeditated modifications to operating equipment, the Air Quality Branch believes this same criteria is applicable to the repairs conducted.  Specifically, facilities should evaluate their repair plan against this fact sheet to determine whether they should apply for a permit modification.  For example, if a damaged stack < 52 feet is being replaced and the final height will be less than the permitted height, a modification will be required.  

This guidance is not intended to be all-inclusive, but we do hope that it may answer some of the questions you'll have during the reconstruction and repair process.  Please do not hesitate to reach out to your facility's permit writer for more specific guidance if necessary.  As of the posting of this message, phone service to the Dr. Percy and Lileah Harris Public Health Building is interrupted; the best way to reach the Air Quality Branch is through email, which can be located on our Contacts page.