Ill. Admin. Code tit. 35 § 302.407

Current through Register Vol. 48, No. 49, December 6, 2024

Section 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 [GREATER THAN OR EQUAL TO] 100 but [LESS THAN OR EQUAL TO] 500 and C is [GREATER THAN OR EQUAL TO] 25 but [LESS THAN OR EQUAL TO] 500)	mg/L	[1276.7 +5.508(H) -1.457(C)] X 0.65
Sulfate (where H is [GREATER THAN OR EQUAL TO] 100 but [LESS THAN OR EQUAL TO] 500 and C is [GREATER THAN OR EQUAL TO] 5 but < 25)	mg/L	[-57.478 + 5.79(H) + 54.163(C)] X 0.65
Sulfate (where H > 500 and C [GREATER THAN OR EQUAL TO] 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:

Click here to view image

where:

Click here to view image
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).

Ill. Admin. Code tit. 35, § 302.407

Amended at 20 Ill. Reg. 7682, effective May 24, 1996

Amended at 39 Ill. Reg. 9388, effective 7/1/2015

Amended at 47 Ill. Reg. 4437, effective 3/23/2023