40 CFR 424.22: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in §§ 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):

Effluent characteristic Effluent limitations

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

Metric units (kg/Mwh)

TSS 0.419 0.209

Chromium total .008 .004

Chromium VI .0008 .0004

Manganese total .084 .042

Cyanide total .004 .002

Phenols .006 .004

pH (1) (1)

English units (lb/Mwh)

TSS .922 .461

Chromium total .018 .009

Chromium VI .0018 .0009

Manganese total .184 .092

Cyanide total .009 .005

Phenols .013 .009

pH (1) (1)

1 Within the range 6.0 to 9.0.

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).