40 CFR 421.122 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

§ 421.122 Effluent limitations guidelines 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 shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:
(a) Subpart L—Film Stripping.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver from film stripping
Copper 95.670 50.350
Zinc 73.510 30.720
Ammonia (as N) 6,712.000 2,951.000
Total suspended solids 2,065.000 981.800
pH (1) (1)
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver from precipitation and filtration of film stripping solutions
Copper 1.843 .970
Zinc 1.416 .592
Ammonia (as N) 129.300 56.840
Total suspended solids 39.770 18.920
pH (1) (1)
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver precipitated
Copper 109.400 57.570
Zinc 84.050 35.120
Ammonia (as N) 7,674.000 3,374.000
Total suspended solids 2,361.000 1,123.000
pH (1) (1)
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver precipitated
Copper 50.540 26.600
Zinc 38.836 16.226
Ammonia (as N) 3,545.000 1,559.000
Total suspended solids 1,090.600 518.700
pH (1) (1)
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver from precipitation and filtration of photographic solutions
Copper 23.070 12.140
Zinc 17.730 7.406
Ammonia (as N) 1,618.000 711.400
Total suspended solids 497.800 236.800
pH (1) (1)
(f) Subpart L—Electrolytic Refining.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver from electrolytic refining
Copper 1.444 .760
Zinc 1.110 .464
Ammonia (as N) 101.300 44.540
Total suspended solids 31.160 14.820
pH (1) (1)
(g) Subpart L—Furnace Wet Air Pollution Control.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver roasted, smelted, or dried
Copper 1.273 .670
Zinc .978 .409
Ammonia (as N) 89.310 39.260
Total suspended solids 27.470 13.070
pH (1) (1)
(h) Subpart L—Leaching.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver produced from leaching
Copper .164 .086
Zinc .126 .053
Ammonia (as N) 11.470 5.040
Total suspended solids 3.526 1.677
pH (1) (1)
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver produced from leaching or silver precipitated
Copper 8.417 4.430
Zinc 6.468 2.703
Ammonia (as N) 590.500 259.600
Total suspended solids 181.700 86.390
pH (1) (1)
(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver precipitated
Copper 5.833 3.070
Zinc 4.482 1.873
Ammonia (as N) 409.300 179.900
Total suspended solids 125.900 59.870
pH (1) (1)
(k) Subpart L—Floor and Equipment Washdown.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 Within the range of 7.5 to 10.0 at all times.
mg/troy ounce of silver production
Copper .000 .000
Zinc .000 .000
Ammonia (as N) .000 .000
Total suspended solids .000 .000
pH (1) (1)
[49 FR 8821, Mar. 8, 1984, as amended at 49 FR 29795, July 24, 1984]

Title 40 published on 2014-07-01

no entries appear in the Federal Register after this date.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code
Statutes at Large
Public Laws