35 Ill. Adm. Code 307.2549
Oxygen and Nitrogen Production
Section 307
Section 307.2549Â Oxygen and
Nitrogen Production
a)        Applicability. This Section applies to discharges resulting
from the production of oxygen and nitrogen by air liquification.
b)        Specialized Definitions. None.
c)        Existing Sources. These sources must comply with the general
and specific pretreatment requirements of Subpart B.
d)        New Sources. All sources are regulated as existing sources.