35 Ill. Adm. Code 203.602
Emission Offset Maintenance Requirement
Section 203
Section 203.602Â Emission
Offset Maintenance Requirement
No person shall cause or allow
the operation of a new major stationary source or major modification where the
owner or operator has demonstrated that it would not interfere with reasonable
further progress by providing emission offsets pursuant to Section 203.302
without maintaining those emission offsets or other equivalent offsets.