Chemical Constituents

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) 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 CaCO 3 * = 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