Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 302 - WATER QUALITY STANDARDS › Subpart E - LAKE MICHIGAN BASIN WATER QUALITY STANDARDS › Section 302.504 - Chemical Constituents

Current through Register Vol. 48, No. 28, July 12, 2024
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.
Click
				  here to view image
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