Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 304 - EFFLUENT STANDARDS › Subpart A - GENERAL EFFLUENT STANDARDS › Section 304.120 - Deoxygenating Wastes

Current through Register Vol. 48, No. 28, July 12, 2024
Except as provided in 35 Ill. Adm. Code 306.Subpart C, all
				  effluents containing deoxygenating wastes must meet the following
				  standards:
a) Effluents must not
				exceed 30 mg/L of five-day biochemical oxygen demand
				(BOD5) or 30 mg/L of suspended solids, except that
				treatment works employing three-stage lagoon treatment systems which are
				properly designed, maintained and operated, and whose effluent has a dilution
				ratio no less than five to one or who qualify for exceptions under subsection
				(c) must not exceed 37 mg/L of suspended solids.
b) Effluents from any source whose untreated
				waste load is 10,000 population equivalents or more, or from any source
				discharging into the Chicago River System or the Calumet River System, must not
				exceed 20 mg/L of BOD5 or 25 mg/L of suspended
				solids.
c) Effluents whose dilution
				ratio is less than five to one must not exceed 10 mg/L of
				BOD5 or 12 mg/L of suspended solids, except that sources
				employing third-stage treatment lagoons are be exempt from this subsection (c)
				provided all of the following conditions are met:
1) The waste source qualifies under one of
				the following categories:
A) Any wastewater
				treatment works with an untreated waste load less than 2500 population
				equivalents, which is sufficiently isolated that combining with other sources
				to aggregate 2500 population equivalents or more is not practicable.
B) Any wastewater treatment works in
				existence and employing third-stage treatment lagoons on January 1, 1986, whose
				untreated waste load is 5000 population equivalents or less and sufficiently
				isolated that combining to aggregate 5000 population equivalents or more is not
				practicable.
C) Any wastewater
				treatment works with an untreated waste load of 5000 population equivalents or
				less, which has reached the end of its useful life by January 1, 1987, and is
				sufficiently isolated that combining to aggregate 5000 population equivalents
				or more is not practicable.
D) Any
				wastewater treatment works with an untreated waste load of 5000 population
				equivalents or less which has reached the end of its useful life and which has
				received an adjusted standard determination from the Board that it qualifies
				for a lagoon exemption. Such a Board determination will only be made in an
				adjusted standard proceeding, held in compliance with Section
				28.1 of the Environmental
				Protection Act [415 ILCS 5/28.1 ] and applicable
				procedures at 35 Ill. Adm. Code 104.
i) In an
				adjusted standard proceeding the Board may determine that the petitioning
				wastewater treatment source qualifies for a lagoon exemption if the wastewater
				treatment works proves that it is so situated that a land treatment system is
				not a suitable treatment alternative. Factors relevant to a suitability finding
				may include the following: cost; influent character; geographic
				characteristics; climate; soil conditions; hydrologic conditions; and the
				availability of irrigable land.
ii)
				For subsection (c)(1)(D), a land treatment system is a wastewater treatment
				system that does not directly discharge treated effluent into the waters of the
				State but instead uses the treated effluent to irrigate terrestrial
				vegetation;