40 CFR 415.642: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

(a) Except as provided in 40 CFR 125.30 through 125.32 any existing point source subject to this subpart and producing cadmium pigments must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

Subpart BL—Cadmium Pigments

Pollutant or pollutant property BPT effluent limitations

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

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

TSS 2.59 1.57

Cadmium (T) 0.078 0.026

Selenium (T) 0.11 0.037

Zinc (T) 0.017 0.0092

pH (1) (1)

1 Within the range 6.0 to 9.0.

(b) Except as provided in 40 CFR 125.30 through 125.32 any existing point source subject to this subpart and producing cadmium salts must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):

Subpart BL—Cadmium Salts

Pollutant or pollutant property BPT effluent limitations

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

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

TSS 0.0016 0.001

Cadmium (T) 4.87 × 10−5 1.62 × 10−5

Selenium (T) 7.0 × 10−5 2.3 × 10−5

Zinc (T) 1.04 × 10−5 5.8 × 10−6

pH (1) (1)

1 Within the range 6.0 to 9.0.