35 Ill. Adm. Code 501.333
New Source
Section 501.333Â New Source
Any building, structure, facility, or installation from
which there is or may be a discharge of pollutants, the construction of which started
after either of the following dates:
a)Â Â Â Â Â Â Â Â after
the promulgation of standards of performance under Section 306 of the Clean
Water Act that apply to the source; or
b)Â Â Â Â Â Â Â Â after
the proposal of standards of performance in compliance with Section 306 of the
Clean Water Act that apply to the source, but only if the standards are
promulgated in compliance with Section 306 within 120 days after their
proposal.