Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Subpart E - LAKE MICHIGAN BASIN WATER QUALITY STANDARDS
Section 302.535 - Ammonia Nitrogen

Universal Citation: 35 IL Admin Code ยง 302.535

Current through Register Vol. 48, No. 12, March 22, 2024

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 + 10x) + 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.

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