The Iowa DNR invites the public to provide informal input on proposed changes to the Air Construction Permit Form MD- Dispersion Modeling Determination. The Form MD is an air construction permit form used to assist applicants in determining whether or not emissions associated with non-Prevention of Significant Deterioration (PSD) construction permit projects will require an air dispersion modeling analysis.
Purpose of the Proposed Changes
The DNR is proposing a new streamlined modeling determination process that retains only the elements of the current determination process that are most likely to identify modeled impacts that require some form of mitigation. The proposed changes will better reflect the modeling determination criteria for minor (non-PSD) projects that are used in the majority of surrounding states. It is anticipated that the proposed changes will reduce the amount of modeling of minor projects by approximately 45%.
Need for Form Changes
The Form MD is being updated and streamlined in conjunction with DNR’s planned implementation of the 2006 fine particulate (PM2.5) and 1-hour nitrogen dioxide (NO2) National Ambient Air Quality Standards (NAAQS). Review of minor projects for these NAAQS is scheduled to begin on January 22, 2013.
Summary of Form Changes
For projects at facilities that have not been previously modeled, the revised determination process requires only that the net increase in potential project emissions be compared to the applicable significant emission rates thresholds to determine the need for modeling review. This is also true for facilities that were previously modeled and the predicted impacts are less than one significance level of a NAAQS (NAAQS – applicable significant impact level). For facilities that have been previously modeled and were found to have predicted impacts within one significance level of a NAAQS (NAAQS – applicable significant impact level), the revised determination process would allow these facilities to first model only the proposed project emissions. In both instances, facility-wide modeling would not be necessary unless the proposed project emissions exceeded the applicable significant impact level(s) for the affected project pollutant(s).
Information available for review
The proposed form is available on the DNR’s website at Air Quality Public Input
(scroll down to the Other Air Quality Items
section). Or, click here: http://www.iowadnr.gov/InsideDNR/RegulatoryAir/StakeholderInvolvement/PublicInput.aspx
(scroll down to Other Air Quality Items
How to Provide Input
Please provide any informal comments or suggestions to Lori Hanson, Iowa DNR Air Quality Bureau, by Friday, December 14, 2012,
Fax: (515) 242-5094
Mail or Hand-delivery: DNR Air Quality Bureau, 7900 Hickman Road, Suite 1, Windsor Heights, Iowa, 50324
For questions, please contact Lori Hanson at the e-mail address noted above or by phone at (515) 281-8911.
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.