An upset may constitute an affirmative defense to an action brought for noncompliance with categorical pretreatment standards if the requirements of Section 310.903 are met.
Ill. Admin. Code tit. 35, § 310.902
Amended at 28 Ill. Reg. 3390, effective February 6, 2004
BOARD NOTE: Derived from 40 CFR 403.16(b) (2003).