Water Quality-Based Effluent Limits - US EPA

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species is very sensitive, freshwater aquatic organisms and their uses should not be affected unacceptably if the 4-day average concentration (in ug/L) of cadmium does not exceed the numerical value given by e(0.7852[1n(hardness)]–3.490) more than once every 3 years on the average and if the one-hour average

  Quality, Water, Freshwater, Water quality, Effluent