Section 302

Section 302.504 Chemical Constituents

The following concentrations of chemical constituents must not be exceeded, except as provided in Sections 302.102 and 302.530:

a) The following standards must be met in all waters of the Lake Michigan Basin. Acute aquatic life standards (AS) must not be exceeded at any time except for those waters for which the Agency has approved a zone of initial dilution (ZID) pursuant to Section 302.102 and 302.530. Chronic aquatic life standards (CS) and human health standards (HHS) must not be exceeded outside of waters in which mixing is allowed pursuant to Section 302.102 and 302.530 by the arithmetic average of at least four consecutive samples collected over a period of at least four days. The samples used to demonstrate compliance with the CS or HHS must be collected in a manner which assures an average representation of the sampling period.

Constituent	STORET Number	Unit	AS	CS	HHS
Arsenic (Trivalent, dissolved)	22680	µg/L	340 X 1.0*= 340	148 X 1.0*=148	NA

Cadmium (dissolved)	01025	µg/L	exp[A+Bln (H)] X {1.138672-[(1nH) (0.0418) 38)]}*, where A=-3.6867 and B=1.128	exp[A+Bln(H)] X {1.101672- [(1nH)(0.0418 38)]}*, where A=-2.715 and B=0.7852	NA

Chromium (Trivalent, dissolved)	80357	µg/L	exp[A+Bln (H)] X 0.316*, where A=-3.7256 and B=0.819	exp[A+Bln(H)] X 0.860*, where A=-0.6848 and B=0.819	NA

Copper (dissolved)	01040	µg/L	exp[A+Bln (H)] X 0.960,* where A=-1.700 and B=0.9422	exp[A+Bln(H)] X 0.960*, where A=-1.702 and B=0.8545	NA

Cyanide (Weak acid dissociable)	00718	µg/L	22	5.2	NA

Lead (dissolved)	01049	µg/L	exp[A+Bln(H)] X {1.46203- [(1nH)(0.145712)]}*, where A=-1.055 and B=1.273	exp[A+Bln(H)] X {1.46203- [(1nH)(0.1457 12)]}*, where A=-4.003 and B=1.273	NA

Nickel (dissolved)	01065	µg/L	exp[A+Bln(H)] X 0.998*, where A=2.255 and B=0.846	exp[A+Bln(H)] X 0.997*, where A=0.0584 and B=0.846	NA

Selenium (dissolved)	01145	µg/L	NA	5.0	NA

TRC	50060	µg/L	19	11	NA

Zinc (dissolved)	01090	µg/L	exp[A+Bln(H)] X 0.978*, where A=0.884 and B=0.8473	exp[A+Bln(H)] X 0.986*, where A=0.884 and B=0.8473	NA

Benzene	78124	µg/L	3900	800	310

Chlorobenzene	34301	mg/L	NA	NA	3.2

2.4-Dimethylphenol	34606	mg/L	NA	NA	8.7

2,4-Dinitrophenol	03756	mg/L	NA	NA	2.8

Endrin	39390	µg/L	0.086	0.036	NA

Ethylbenzene	78113	µg/L	150	14	NA

Hexachloroethane	34396	µg/L	NA	NA	6.7

Methylene chloride	34423	mg/L	NA	NA	2.6

Parathion	39540	µg/L	0.065	0.013	NA

Pentachlorophenol	03761	µg/L	exp B ([pH] +A), where A=-4.869 and B=1.005	exp B ([pH] +A), where A=-5.134 and B=1.005	NA

Toluene	78131	mg/L	2000	610	51.0

Trichloroethylene	39180	µg/L	NA	NA	370

Xylene(s)	81551	µg/L	1200	490	NA

Where:
	NA	=	Not Applied
	Exp[x]	=	base of natural logarithms raised to the x-power
	ln(H)	=	natural logarithm of Hardness (STORET 00900)
	*	=	conversion factor multiplier for dissolved metals

b) The following water quality standards must not be exceeded at any time in any waters of the Lake Michigan Basin, unless a different standard is specified under subsection (c) of this Section.

Constituent	STORET Number	Unit	Water Quality Standards
Barium (total)	01007	mg/L	5.0
Boron (total)	01022	mg/L	1.0
Chloride (total)	00940	mg/L	500
Fluoride	00951	mg/L	1.4
Iron (dissolved)	01046	mg/L	1.0
Manganese (total)	01055	mg/L	1.0
Phenols	32730	mg/L	0.1
Sulfate	00945	mg/L	500
Total Dissolved Solids	70300	mg/L	1000

c) In addition to the standards specified in subsections (a) and (b) of this Section, the following standards must not be exceeded at any time in the Open Waters of Lake Michigan as defined in Section 302.501.

Constituent	STORET Number	Unit	Water Quality Standards
Arsenic (total)	01002	µg/L	50.0
Barium (total)	01007	mg/L	1.0
Chloride	00940	mg/L	12.0
Iron (dissolved)	01046	mg/L	0.30
Lead (total)	01051	µg/L	50.0
Manganese (total)	01055	mg/L	0.15
Nitrate-Nitrogen	00620	mg/L	10.0
Phosphorus	00665	µg/L	7.0
Selenium (total)	01147	µg/L	10.0
Sulfate	00945	mg/L	24.0
Total Dissolved Solids	70300	mg/L	180.0
Oil (hexane solubles or equivalent)	00550, 00556 or 00560	mg/L	0.10
Phenols	32730	µg/L	1.0

d) In addition to the standards specified in subsections (a), (b) and (c) of this Section, the following human health standards (HHS) must not be exceeded in the Open Waters of Lake Michigan as defined in Section 302.501 by the arithmetic average of at least four consecutive samples collected over a period of at least four days. The samples used to demonstrate compliance with the HHS must be collected in a manner which assures an average representation of the sampling period.

Constituent	STORET Number	Unit	Water Quality Standards
Benzene	34030	µg/L	12.0
Chlorobenzene	34301	µg/L	470.0
2,4-Dimethylphenol	34606	µg/L	450.0
2,4-Dinitrophenol	03757	µg/L	55.0
Hexachloroethane (total)	34396	µg/L	5.30
Lindane	39782	µg/L	0.47
Methylene chloride	34423	µg/L	47.0
Toluene	78131	mg/L	5.60
Trichloroethylene	39180	µg/L	29.0

e) For the following bioaccumulative chemicals of concern (BCCs), acute aquatic life standards (AS) must not be exceeded at any time in any waters of the Lake Michigan Basin and chronic aquatic life standards (CS), human health standards (HHS), and wildlife standards (WS) must not be exceeded in any waters of the Lake Michigan Basin by the arithmetic average of at least four consecutive samples collected over a period of at least four days subject to the limitations of Sections 302.520 and 302.530. The samples used to demonstrate compliance with the HHS and WS must be collected in a manner that assures an average representation of the sampling period.

Constituent	STORET Number	Unit	AS	CS	HHS	WS
Mercury (total)	71900	ng/L	1,700	910	3.1	1.3
Chlordane	39350	ng/L	NA	NA	0.25	NA
DDT and metabolites	39370	pg/L	NA	NA	150	11.0
Dieldrin	39380	ng/L	240	56	0.0065	NA
Hexachlorobenzene	39700	ng/L	NA	NA	0.45	NA
Lindane	39782	µg/L	0.95	NA	0.5	NA
PCBs (class)	79819	pg/L	NA	NA	26	120
2,3,7,8-TCDD	03556	fg/L	NA	NA	8.6	3.1
Toxaphene	39400	pg/L	NA	NA	68	NA

Where:	mg/L	=	milligrams per liter (10^-3 grams per liter)
	µg/L	=	micrograms per liter (10^-6 grams per liter)
	ng/L	=	nanograms per liter (10^-9 grams per liter)
	pg/L	=	picograms per liter (10^-12 grams per liter)
	fg/L	=	femtograms per liter (10^-15 grams per liter)
	NA	=	Not Applied

(Source: Amended at 27 Ill. Reg. 166, effective December 20, 2002)