40 CFR 465.31: Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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 practicable control technology currently available:

Subpart C

Pollutant or pollutant property BPT Effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/m 2 (pounds per 1 million ft 2) of area processed

Chromium 1.42 (0.29) 0.58 (0.12)

Cyanide 0.98 (0.20) 0.41 (0.083)

Zinc 4.48 (0.92) 1.89 (0.39)

Aluminum 15.3 (3.14) 6.26. (1.28)

Oil and grease 67.3 (13.8) 40.4 (8.27)

TSS 138.0 (28.3) 67.3 (13.8)

pH (1) (1) (1) (1)

1 Within the range of 7.5 to 10.0 at all times.