326 IAC 1-2-42 "Modification" defined

Sec. 42. "Modification" means one (1) or more of the following activities at an existing source: (1) A physical change or change in the method of operation of any existing emissions unit that increases the potential to emit any regulated pollutant that could be emitted from the emissions unit, or that results in emissions of any regulated pollutant not previously emitted. (2) Construction of one (1) or more new emissions units that have the potential to emit regulated air pollutants. (3) Reconstruction of one (1) or more existing emissions units that increases the potential to emit any regulated air pollutant.