It is the purpose of this Section to avoid the existence of duplicative, overlapping or conflicting State and federal regulatory systems.
The regulations adopted by the Board to establish a PSD permit program shall incorporate by reference, pursuant to subsection (a) of Section 5-75 of the Illinois Administrative Procedure Act, the provisions of 40 CFR 52.21, except for the following subparts: (a) (1) Plan disapproval, (q) Public participation, (s) Environmental impact statements, (t) Disputed permits or redesignations and (u) Delegation of authority; the Board may adopt more stringent or additional provisions to the extent it deems appropriate. To the extent that the provisions of 40 CFR 52.21 provide for the Administrator to make various determinations and to take certain actions, these provisions shall be modified to indicate the Agency if appropriate. Nothing in this subsection shall be construed to limit the right of any person to submit a proposal to the Board or the authority of the Board to adopt elements of a PSD permit program that are more stringent than those contained in 40 CFR 52.21, pursuant to the rulemaking requirements of Title VII of this Act and Section 5-35 of the Illinois Administrative Procedure Act.
415 ILCS 5/9.1