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) under Sections 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 under Sections 302.102 and 302.530
by the arithmetic average of at least four consecutive samples collected over
at least four days. The samples used to demonstrate compliance with the CS or
HHS must be collected in a manner that assures an average representation of the
sampling period.
Constituent
|
Unit
|
AS
|
CS
|
HHS
|
Arsenic
(Trivalent, dissolved)
|
µg/L
|
|
148 x
1.0*=148
|
NA
|
|
|
|
|
|
Boron
(total)
|
mg/L
|
40.1
|
7.6
|
NA
|
|
|
|
|
|
Cadmium
(dissolved)
|
µg/L
|
|
|
NA
|
(0.041838)]}*
|
(0.041838)]}*
|
|
|
|
|
|
|
|
where A =
-3.6867 and B = 1.128
|
where A =
-2.715 and B = 0.7852
|
|
|
|
|
|
|
Chromium
(Hexavalent, total)
|
µg/L
|
16
|
11
|
NA
|
|
|
|
|
|
Chromium
(Trivalent, dissolved)
|
µg/L
|
|
|
NA
|
0.316*
|
0.860*
|
|
|
where A =
3.7256 and B = 0.819
|
where A =
0.6848 and B = 0.819
|
|
|
|
|
|
|
Copper
(dissolved)
|
µg/L
|
|
|
NA
|
0.960*
|
0.960*
|
|
|
|
|
|
|
|
where A =
-1.700 and B = 0.9422
|
where A =
-1.702 and B = 0.8545
|
|
|
|
|
|
|
Cyanide**
|
µg/L
|
22
|
5.2
|
NA
|
|
|
|
|
|
Fluoride
(total)
|
µg/L
|
where A
= 6.7319 and B = 0.5394
|
, but must not exceed 4.0
mg/L
|
NA
|
|
|
|
|
where A
= 6.0445 and B = 0.5394
|
|
|
|
|
|
|
Lead
(dissolved)
|
µg/L
|
|
|
NA
|
(0.145712)]}*
|
(0.145712)]}*
|
|
|
|
|
|
|
|
where A =
-1.055 and B =1.273
|
where A =
-4.003 and B = 1.273
|
|
|
|
|
|
|
Manganese
(dissolved)
|
µg/L
|
|
|
NA
|
|
|
|
|
|
|
|
where A
= 4.9187 and B = 0.7467
|
where A
= 4.0635 and B = 0.7467
|
|
|
|
|
|
|
Nickel
(dissolved)
|
µg/L
|
|
|
NA
|
0.998*
|
0.997*
|
|
|
|
|
|
|
|
where A =
2.255 and B = 0.846
|
where A =
0.0584 and B = 0.846
|
|
|
|
|
|
|
Selenium
(dissolved)
|
µg/L
|
NA
|
5.0
|
NA
|
|
|
|
|
|
TRC
|
µg/L
|
19
|
11
|
NA
|
|
|
|
|
|
Zinc
(dissolved)
|
µg/L
|
|
|
NA
|
0.978*
|
0.986*
|
|
|
|
|
|
|
|
where A
= 0.884 and B = 0.8473
|
where A
= 0.884 and B = 0.8473
|
|
|
|
|
|
|
Benzene
|
µg/L
|
3900
|
800
|
310
|
|
|
|
|
|
Chlorobenzene
|
mg/L
|
NA
|
NA
|
3.2
|
|
|
|
|
|
2.4-Dimethylphenol
|
mg/L
|
NA
|
NA
|
8.7
|
|
|
|
|
|
2,4-Dinitrophenol
|
mg/L
|
NA
|
NA
|
2.8
|
|
|
|
|
|
Endrin
|
µg/L
|
0.086
|
0.036
|
NA
|
|
|
|
|
|
Ethylbenzene
|
µg/L
|
150
|
14
|
NA
|
|
|
|
|
|
Hexachloroethane
|
µg/L
|
NA
|
NA
|
6.7
|
|
|
|
|
|
Methylene
chloride
|
mg/L
|
NA
|
NA
|
2.6
|
|
|
|
|
|
Parathion
|
µg/L
|
0.065
|
0.013
|
NA
|
|
|
|
|
|
Pentachlorophenol
|
µg/L
|
|
|
NA
|
|
|
|
|
|
|
|
where A
= -4.869 and B = 1.005
|
where A
= -5.134 and B = 1.005
|
|
|
|
|
|
|
Toluene
|
µg/L
|
2000
|
610
|
51.0
|
|
|
|
|
|
Trichloroethylene
|
µg/L
|
NA
|
NA
|
370
|
|
|
|
|
|
Xylene(s)
|
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
in mg/L as CaCO3
|
|
*
|
=
|
conversion factor multiplier
for dissolved metals
|
|
**
|
=
|
standard to be evaluated using
either of the following USEPA approved methods, incorporated by reference at
35 Ill. Adm. Code 301.106: Method OIA-1677, DW: Available Cyanide by Flow
Injection, Ligand Exchange, and Amperometry, January 2004, Document Number
EPA-821-R-04-001; or Cyanide Amenable to Chlorination, Standard Methods
4500-CN-G (40 CFR 136.3).
|
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).
Constituent
|
|
Unit
|
Water Quality Standard
|
Barium (total)
|
01007
|
mg/L
|
5.0
|
Chloride (total)
|
|
mg/L
|
500
|
Iron (dissolved)
|
|
mg/L
|
1.0
|
Phenols
|
|
mg/L
|
0.1
|
Sulfate
|
|
mg/L
|
500
|
Total
Dissolved Solids
|
|
mg/L
|
1000
|
c) In addition to the standards specified in subsections (a) and
(b), the following standards must not be exceeded at any time in the Open
Waters of Lake Michigan as defined in Section 302.501.
Constituent
|
Unit
|
Water Quality Standard
|
Arsenic (total)
|
µg/L
|
50.0
|
Boron (total)
|
mg/L
|
1.0
|
Barium (total)
|
mg/L
|
1.0
|
Chloride (total)
|
mg/L
|
12.0
|
Fluoride (total)
|
mg/L
|
1.4
|
Iron (dissolved)
|
mg/L
|
0.30
|
Lead (total)
|
µg/L
|
50.0
|
Manganese (total)
|
mg/L
|
0.15
|
Nitrate-Nitrogen
|
mg/L
|
10.0
|
Phosphorus
|
µg/L
|
7.0
|
Selenium (total)
|
µg/L
|
10.0
|
Sulfate
|
mg/L
|
24.0
|
Total
Dissolved Solids
|
mg/L
|
180.0
|
Oil (hexane solubles or
equivalent)
|
mg/L
|
0.10
|
Phenols
|
µg/L
|
1.0
|
d) In addition to the standards specified in subsections (a), (b),
and (c), 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 at least four
days. The samples used to demonstrate compliance with the HHS must be
collected in a manner that assures an average representation of the sampling
period.
Constituent
|
Unit
|
Water Quality Standard
|
Benzene
|
µg/L
|
12.0
|
Chlorobenzene
|
µg/L
|
470.0
|
2,4-Dimethylphenol
|
µg/L
|
450.0
|
2,4-Dinitrophenol
|
µg/L
|
55.0
|
Hexachloroethane (total)
|
µg/L
|
5.30
|
Lindane
|
µg/L
|
0.47
|
Methylene chloride
|
µg/L
|
47.0
|
Trichloroethylene
|
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 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
|
Unit
|
AS
|
CS
|
HHS
|
WS
|
Mercury
(total)
|
ng/L
|
1,700
|
910
|
3.1
|
1.3
|
Chlordane
|
ng/L
|
NA
|
NA
|
0.25
|
NA
|
DDT and
metabolites
|
pg/L
|
NA
|
NA
|
150
|
11.0
|
Dieldrin
|
ng/L
|
240
|
56
|
0.0065
|
NA
|
Hexachlorobenzene
|
ng/L
|
NA
|
NA
|
0.45
|
NA
|
Lindane
|
µg/L
|
0.95
|
NA
|
0.5
|
NA
|
PCBs
(class)
|
pg/L
|
NA
|
NA
|
26
|
120
|
2,3,7,8-TCDD
|
fg/L
|
NA
|
NA
|
8.6
|
3.1
|
Toxaphene
|
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 47 Ill.
Reg. 4437, effective March 23, 2023)