CFR / Title 40 / Part 421 / Sec. 421.123 Effluent limitations guidelines representing the degreeavailable 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------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

from film stripping

--------------Copper........................................ 64.450 30.720Zinc.......................................... 51.360 21.150Ammonia (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------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

from precipitation and

filtration of film

stripping solutions

--------------Copper........................................ 1.242 .592Zinc.......................................... .990 .408

Ammonia (as N)................................ 129.300 56.840------------------------------------------------------------------------

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

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

precipitated

--------------Copper........................................ 73.690 35.120Zinc.......................................... 58.720 24.180Ammonia (as N)................................ 7,674.000 3,374.000------------------------------------------------------------------------

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

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

precipitated

--------------Copper........................................ 34.048 16.226Zinc.......................................... 27.132 11.172Ammonia (as N)................................ 3,545.000 1,559.000------------------------------------------------------------------------

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

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

from precipitation and

filtration of

photographic solutions

--------------Copper........................................ 15.540 7.406Zinc.......................................... 12.380 5.099Ammonia (as N)................................ 1,618.000 711.400------------------------------------------------------------------------

(f) Subpart L--Electrolytic Refining.

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

from electrolytic

refining

--------------Copper........................................ .973 .464Zinc.......................................... .775 .319Ammonia (as N)................................ 101.300 44.540------------------------------------------------------------------------

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

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

roasted, smelted, or

dried

--------------Copper........................................ .000 .000Zinc.......................................... .000 .000Ammonia (as N)................................ .000 .000------------------------------------------------------------------------

(h) Subpart L--Leaching.

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

produced from leaching

--------------Copper........................................ .110 .053Zinc.......................................... .088 .036Ammonia (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------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

produced from leaching

or silver precipitated

--------------Copper........................................ 5.671 2.703Zinc.......................................... 4.519 1.861Ammonia (as N)................................ 590.500 259.600------------------------------------------------------------------------

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

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

precipitated

--------------Copper........................................ 3.930 1.873Zinc.......................................... 3.132 1.290Ammonia (as N)................................ 409.300 179.900------------------------------------------------------------------------

(k) Subpart L--Floor and Equipment Washdown.

BAT Effluent Limitations------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of silver

production