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Minor Revisions to Modeling Guidance Documents
Posted: 02/20/2014

Several dispersion modeling documents have been revised to clarify the guidance within them. The revisions include the addition of references where available, and updates to the text so the differences between recommendations and requirements are clear. There are no changes to the methodologies suggested in the documents. The affected documents are listed below, and drafts of each are available on the Air Quality Bureau’s Stakeholder Involvement website.

·         DNR Suggested Methodology for Modeling Restricted Hours of Operation

·         Concrete Batch Plants 

·         Dump Pits 

·         Flare Guidance 

·         Grain Dryers 

·         Haul Roads 

·         Rain Caps and Horizontal Stacks 

·         Storage Piles 

·         Storage Tanks 

·         Truck or Rail Loadout


Please contact Brad Ashton at, or by phone at (515) 725-9527, with any questions or comments by 3/6/2014. Depending on comments received, the final documents will be posted to the website at that time or soon thereafter.


This list serve article is intended for consultants, industries, environmental groups, general public, and other entities regulated under the Clean Air Act. It was written by the DNR Air Quality Bureau to share regulatory news, program updates and technical guidance.