Ill. Admin. Code tit. 35, § 725.505
a) The waste is treated, rendered, or mixed before or immediately after placement in the treatment process or equipment so that both of the following conditions are fulfilled:
Ignitable or reactive waste must not be placed in a treatment process or equipment unless either of the following conditions exists:
(Source: Amended at 32 Ill. Reg. 12566, effective July 14, 2008)