Section 52.60 - Significant deterioration of air quality(a) All applications and other information required pursuant to § 52.21 from sources located in the State of Alabama shall be submitted to the State agency, Alabama Department of Environmental Management, P.O. Box 301463, Montgomery, Alabama 36130-1463, rather than to EPA's Region 4 office.(b) On March 24, 1987, the Alabama Department of Environmental Management submitted a letter committing the State of Alabama to require that modeling for PSD permits be done only in accordance with the "Guideline on Air Quality Models (Revised)" or other models approved by EPA.42 FR 22869, May 5, 1977, as amended at 46 FR 55518, Nov. 10, 1981; 52 FR 48812, Dec. 28, 1987; 74 FR 55143 , Oct. 27, 2009