Ill. Admin. Code tit. 35, § 302.535 - Ammonia Nitrogen

The Open Waters of Lake Michigan as defined in Section 302.501 must not exceed 0.02 mg/L total ammonia (as N). The remaining waters of the Lake Michigan Basin are subject to the following:

a) Total ammonia nitrogen (as N) must in no case exceed 15 mg/L.

b) Un-ionized ammonia nitrogen (as N) must not exceed the acute and chronic standards given below subject to the provisions of Section 302.208(a) and (b):

1) From April through October, the Acute Standard (AS) must be 0.33 mg/L and the chronic standard (CS) must be 0.057 mg/L.

2) From November through March, the AS must be 0.14 mg/L and the CS must be 0.025 mg/L.

c) For this Section, the concentration of un-ionized ammonia nitrogen as N and total ammonia as N must be computed according to the following equations:

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and N = U[0.94412 (1 + 10^x) + 0.0559]

Where:

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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.

Notes

Ill. Admin. Code tit. 35, § 302.535

Amended at 23 Ill. Reg. 11249, effective August 26, 1999

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