40 CFR 424.23: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

The following limitations establish the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged by a point source subject to the provisions of this subpart after application of the best available technology economically achievable:

Effluent characteristic Effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days shall not exceed—

Metric units (kg/Mwh)

Chromium total 0.001 0.0005

Chromium VI .0001 .00005

Manganese total .011 .005

Cyanide total .0005 .0003

Phenols .0004 .0002

English units (lb/Mwh)

Chromium total .002 .0012

Chromium VI .0002 .0001

Manganese total .023 .012

Cyanide total .001 .0006

Phenols .0009 .0005

Provided, however, That for nonelectric furnace smelting processes, the units of effluent limitations set forth in this section shall be read as “kg/kkg of product” rather than “kg/Mwh,” and the limitations (except for pH) shall be 3.3 times those listed in the table in this section (or, for English units, “lb/ton of product” rather than “lb/Mwh,” and the limitations (except for pH) shall be three times those listed in the table).