40 CFR 410.23: Effluent limitation representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

(a) Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):

Pollutant or pollutant property BAT limitation

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (or pounds per 1,000 lb) of fiber

COD 163.0 81.5

Sulfide 0.28 0.14

Phenols 0.14 0.07

Total Chromium 0.14 0.07

(b) Additional allocations equal to the effluent limitations established in paragraph (a) of this section are allowed any existing point source subject to such effluent limitations that finishes wool or blended wool fabrics through “commission finishing” as defined in § 410.01.