35 Ill. Adm. Code 310.910
Definitions
Section 310
Section 310.910Â Definitions
For the purposes of this Subpart
J, the following definitions apply:
"Bypass" means the intentional diversion of waste
streams  from any portion of an industrial user's treatment facility.
"Severe property damage" means substantial physical
damage to property, damage to treatment facilities that causes them to become
inoperable or substantial and permanent loss of natural resources that can
reasonably be expected to occur in the absence of a bypass. Severe property
damage does not mean economic loss caused by delays in production.
BOARD NOTE:Â
Derived from 40 CFR 403.17(a) (2003).