AUTHORITY: Authorized by Section 4(b) of the Environmental Protection Act [415 ILCS 5/4(b)].
SOURCE: Adopted at 17 Ill. Reg. 7782, effective May 14, 1993; amended at 25 Ill. Reg. 9856, effective July 17, 2001; amended at 36 Ill. Reg. 6809, effective April 20, 2012.