40 CFR 421.123: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

Except as provided in 40 CFR 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 available technology economically achievable:

(a) Subpart L—Film Stripping.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver from film stripping

Copper 64.450 30.720

Zinc 51.360 21.150

Ammonia (as N) 6,712.000 2,951.000

(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver from precipitation and filtration of film stripping solutions

Copper 1.242 .592

Zinc .990 .408

Ammonia (as N) 129.300 56.840

(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver precipitated

Copper 73.690 35.120

Zinc 58.720 24.180

Ammonia (as N) 7,674.000 3,374.000

(d) Subpart L—Precipitation and Filtration of Photographic Solutions.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver precipitated

Copper 34.048 16.226

Zinc 27.132 11.172

Ammonia (as N) 3,545.000 1,559.000

(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver from precipitation and filtration of photographic solutions

Copper 15.540 7.406

Zinc 12.380 5.099

Ammonia (as N) 1,618.000 711.400

(f) Subpart L—Electrolytic Refining.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver from electrolytic refining

Copper .973 .464

Zinc .775 .319

Ammonia (as N) 101.300 44.540

(g) Subpart L—Furnace Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver roasted, smelted, or dried

Copper .000 .000

Zinc .000 .000

Ammonia (as N) .000 .000

(h) Subpart L—Leaching.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver produced from leaching

Copper .110 .053

Zinc .088 .036

Ammonia (as N) 11.470 5.040

(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver produced from leaching or silver precipitated

Copper 5.671 2.703

Zinc 4.519 1.861

Ammonia (as N) 590.500 259.600

(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver precipitated

Copper 3.930 1.873

Zinc 3.132 1.290

Ammonia (as N) 409.300 179.900

(k) Subpart L—Floor and Equipment Washdown.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/troy ounce of silver production

Copper .000 .000

Zinc .000 .000

Ammonia (as N) .000 .000