Illinois Administrative Code (Last Updated: March 27, 2024) |
TITLE35. ENVIRONMENTAL PROTECTION |
PART302. WATER QUALITY STANDARDS |
SUBPARTD. CHICAGO AREA WATERWAY SYSTEM AND LOWER DES PLAINES RIVER WATER QUALITY STANDARDS AND INDIGENOUS AQUATIC LIFE STANDARDS |
§302.407. Chemical Constituents
-
a) The acute standard (AS) for the chemical constituents listed in subsection (e) must not be exceeded at any time except as provided in subsection (d).
b) The chronic standard (CS) for the chemical constituents listed in subsection (e) must not be exceeded by the arithmetic average of at least four consecutive samples collected over any period of four days, except as provided in subsection (d). The samples used to demonstrate attainment or lack of attainment with a CS must be collected in a manner that assures an average representative of the sampling period. For the chemical constituents that have water quality-based standards dependent upon hardness, the chronic water quality standard will be calculated according to subsection (e) using the hardness of the water body at the time the sample was collected. To calculate the attainment status of chronic standards, the concentration of the chemical constituent in each sample is divided by the calculated water quality standard for the sample to determine a quotient. The water quality standard is attained if the mean of the sample quotients is less than or equal to one for the duration of the averaging period.
c) The human health standard (HHS) for the chemical constituents listed in subsection (f) must not be exceeded, on a 12-month rolling average based on at least eight samples, collected in a manner representative of the sampling period, except as provided in subsection (d).
d) In waters where mixing is allowed under Section 302.102, the following apply:
1) The AS must not be exceeded in any waters except for those waters for which a zone of initial dilution (ZID) applies under Section 302.102.
2) The CS must not be exceeded outside of waters in which mixing is allowed under Section 302.102.
3) The HHS must not be exceeded outside of waters in which mixing is allowed under Section 302.102.
e) Numeric Water Quality Standards for the Protection of Aquatic Organisms
Constituent
AS
(µg/L)
CS
(µg/L)
Arsenic
(trivalent, dissolved)
340 X 1.0*=340
150 X 1.0*=150
Benzene
4200
860
Cadmium
(dissolved)
eA+B ln(H) X {1.138672-[(ln(H))(0.041838)]}*, where A=-2.918 and B=1.128
eA+B ln(H) X {1.101672-[(ln(H))(0.041838)]}*, where A= -3.490 and B=0.7852
Chromium (hexavalent, total)
16
11
Chromium (trivalent, dissolved)
eA+B ln(H) X 0.316*,
where A=3.7256 and
B=0.8190
eA+B ln(H) X 0.860*,
where A=0.6848 and B=0.8190
Copper
(dissolved)
eA+B ln(H) X 0.960*,
where A=-1.645 and
B=0.9422
eA+B ln(H) X 0.960*,
where A=-1.646 and
B=0.8545
Cyanide**
22
10
Ethylbenzene
150
14
Fluoride (total)
eA+B ln(H),
where A=6.7319
and B=0.5394
eA+B ln(H), but must not exceed 4.0 mg/L,
where A=6.0445 and B=0.5394
Lead
(dissolved)
eA+B ln(H) X {1.46203-[(ln(H))(0.145712)]}*,
where A=-1.301 and B=1.273
eA+B ln(H) X {1.46203-[(ln(H))(0.145712)]}*,
where A=-2.863 and
B=1.273
Manganese (dissolved)
eA+B ln(H) X 0.9812*,
where A=4.9187
and B=0.7467
eA+B ln(H) X 0.9812*,
where A=4.0635
and B=0.7467
Mercury (dissolved)
1.4 X 0.85*=1.2
0.77 X 0.85*=0.65
Nickel (dissolved)
eA+B ln(H) X 0.998*,
where A=0.5173 and
B=0.8460
eA+B ln(H) X 0.997*,
where A=-2.286 and
B=0.8460
Toluene
2000
600
TRC
19
11
Xylene(s)
920
360
Zinc (dissolved)
eA+B ln(H) X 0.978*,
where A=0.9035 and
B=0.8473
eA+B ln(H) X 0.986*,
where A=-0.4456 and
B=0.8473
where:
µg/L
=
microgram per liter
H
=
Hardness concentration of receiving water in mg/L as CaCO3
ex
=
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)
f) Numeric Water Quality Standard for the Protection of Human Health
Constituent
HHS (µg/L)
Benzene
310
Mercury (total)
0.012
Phenols
860,000
where:
µg/L
=
microgram per liter
g) Numeric Water Quality Standards for Other Chemical Constituents
Concentrations of the following chemical constituents must not be exceeded except in waters for which mixing is allowed under Section 302.102.
Constituent
Unit
Standard
Chloride
mg/L
500
Iron (dissolved)
mg/L
1.0
Selenium (total)
mg/L
1.0
Silver (dissolved)
µg/L
eA+B ln(H) X 0.85*, where A=-6.52 and B=1.72
Sulfate (where H is ≥ 100 but ≤ 500 and C is ≥ 25 but ≤ 500)
mg/L
[1276.7+5.508(H)-1.457(C)] X 0.65
Sulfate (where H is ≥ 100 but ≤ 500 and C is ≥ 5 but < 25)
mg/L
[-57.478 + 5.79(H) + 54.163(C)] X 0.65
Sulfate (where H > 500 and C ≥ 5)
mg/L
2,000
where:
mg/L
=
milligram per liter
µg/L
=
microgram per liter
H
=
hardness concentration of receiving water in mg/L as CaCO3
C
=
chloride concentration of receiving water in mg/L
ex
=
base of natural logarithms raised to the x-power
ln(H)
=
natural logarithm of hardness in milligrams per liter
*
=
conversion factor multiplier for dissolved metals
h) Concentrations of other chemical constituents in the South Fork of the South Branch of the Chicago River (Bubbly Creek) must not exceed the following standards:
CONSTITUENT
CONCENTRATION (mg/L)
Ammonia Un-ionized (as N*)
0.1
Arsenic (total)
1.0
Barium (total)
5.0
Cadmium (total)
0.15
Chromium (total hexavalent)
0.3
Chromium (total trivalent)
1.0
Copper (total)
1.0
Cyanide (total)
0.10
Fluoride (total)
15.0
Iron (total)
2.0
Iron (dissolved)
0.5
Lead (total)
0.1
Manganese (total)
1.0
Mercury (total)
0.0005
Nickel (total)
1.0
Oil, fats and grease
15.0**
Phenols
0.3
Selenium (total)
1.0
Silver
1.1
Zinc (total)
1.0
Total Dissolved Solids
1500
* For purposes of this Section, the concentration of un-ionized ammonia must be computed according to the following equation:
where:
X
=
U
=
Concentration of un-ionized ammonia as N in mg/L
N
=
Concentration of ammonia nitrogen as N in mg/L
T
=
Temperature in degrees Celsius
** Oil must be analytically separated into polar and non-polar components if the total concentration exceeds 15 mg/L. In no case may either of the components exceed 15 mg/L (i.e., 15 mg/L polar materials and 15 mg/L non-polar materials).
(Source: Amended at 47 Ill. Reg. 4437, effective March 23, 2023)