Section 304.222  Intermittent Discharge of TRC

The acute TRC water quality standard of 35 Ill. Adm. Code 302.208 and 302.504(a) by operation of Section 304.105 does not apply to any discharge that contains TRC solely as the result of intermittent use for antifouling purposes related to the operation of condensers and cooling systems. For this Section using chlorine or related substances measurable as TRC will be deemed to be intermittent if use is restricted to a maximum of two hours per day per condenser or cooling system unit. Discharge concentration of TRC averaged or composited over the discharge period must not exceed 0.2 mg/L and the TRC concentration must not exceed 0.5 mg/L at any time.

(Source:  Amended at 47 Ill. Reg. 4601, effective March 23, 2023)