The DNR has revised the “Is Modification to My Air Construction Permit Needed? ”fact sheet and corresponding FAQ to incorporate updates made to 40 CFR Part 51 Appendix W. The fact sheet and FAQ have been revised to allow additional operational flexibility to change discharge styles without a permit modification for downward to horizontal, downward to vertical obstructed, and downward to vertical unobstructed discharge types. Based on comments and questions received from industry, DNR, and other stakeholders during the review period, the DNR has added additional scenarios to the FAQ.
The fact sheet titled “Is Modification to My Air Construction Permit Needed?” and the “Equipment Modification FAQ” are located at https://www.iowadnr.gov/Environmental-Protection/Air-Quality/Construction-Permits/Construction-Permitting-Materials under the general guidance tab and are available for use.