Ammonia Nitrogen

Section 302 Section 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: U = N [0.94412(1 + 10 x ) + 0.0559] and N = U[0.94412(1 + 10 x ) + 0.0559] Where: X = 0.09018 + 2729.92 -pH (T + 273.16) 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.