Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 203 - MAJOR STATIONARY SOURCES CONSTRUCTION AND MODIFICATION
Subpart B - MAJOR STATIONARY SOURCES IN NONATTAINMENT AREAS
Section 203.207 - Major Modification of a Source
Current through Register Vol. 48, No. 38, September 20, 2024
a) Except as provided in subsection (c), (d), (e) or (f), a physical change, or change in the method of operation of a major stationary source that would result in a significant net emissions increase of any pollutant for which the area is designated a nonattainment area, shall constitute a major modification of a source.
b) Any net emissions increase that is significant for volatile organic material or nitrogen oxides shall be considered significant for ozone.
c) A physical change or change in the method of operation shall not include:
d) In an area classified as serious or severe non attainment for ozone, increased emissions of volatile organic material or nitrogen oxides resulting from any physical change in, or change in the method of operation of, a stationary source located in the area shall be considered de minimis for purposes of this Part if the increase in net emissions of such air pollutant from such source does not exceed 25 tons when aggregated with all other net increases in emissions from the source over any period of five consecutive calendar years that includes the year in which such increase occurred.
e) In the case of any major stationary source of volatile organic material or nitrogen oxides located in an area classified as serious or severe nonattainment for ozone (other than a source that emits or has the potential to emit 100 tons or more of volatile organic material or nitrogen oxides per year), whenever any change at that source results in any increase (other than a de minimis increase) in emissions of volatile organic material or nitrogen oxides, respectively, from any discrete operation, unit, or other pollutant emitting activity at the source, such increase shall be considered a major modification for purposes of this Part, except such increase shall not be considered a major modification for such purposes if the owner or operator of the source elects to offset the increase by a greater reduction in emissions of volatile organic material or nitrogen oxides, respectively, from other operations, units, or activities within the source at an internal offset ratio of at least 1.3 to 1.
f) In areas classified as extreme nonattainment for ozone, beginning on the date that an area is classified by USEPA as an extreme nonattainment area for ozone, any physical change in or change in the method of operation of a major stationary source that results in any increase in emissions of volatile organic material or nitrogen oxides from a discrete operation, unit, or other pollutant emitting activity shall be considered a major modification.