35 Ill. Adm. Code 219.968
Testing
Section 219
Section 219.968 Testing
a) When in the opinion of the Agency it is necessary to conduct
testing to demonstrate compliance with Section 219.966 of this Part, the owner
or operator of a VOM emission unit subject to the requirements of this Subpart
shall, at his own expense, conduct such tests in accordance with the applicable
test methods and procedures specified in Section 219.105 of this Part.
b) Nothing in this Section shall limit the authority of the USEPA
pursuant to the Clean Air Act, as amended, to require testing.