['Water Programs']
['Point Sources']
05/04/2022
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§421.260 Applicability: Description of the secondary precious metals subcategory.
The provisions of this subpart are applicable to discharges resulting from the production of precious metals at secondary precious metals facilities.
§421.261 Specialized definitions.
For the purpose of this subpart:
(a) Except as provided below, the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
(b) The term precious metals shall mean gold, platinum, palladium, rhodium, iridium, osmium, and ruthenium.
(c) The term Combined Metals, shall mean the total of gold, platinum and palladium.
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31705, Aug. 3, 1990]
§421.262 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) Furnace wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 136.400 | 71.800 |
| Cyanide (total) | 20.820 | 8.616 |
| Zinc | 104.800 | 43.800 |
| Ammonia (as N) | 9,571.000 | 4,207.000 |
| Combined metals | 21.54 | |
| Total suspended solids | 2,944.000 | 1,400.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(b) Raw material granulation.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metal in the granulated raw material | ||
| Copper | 12.050 | 6.340 |
| Cyanide (total) | 1.839 | 0.761 |
| Zinc | 9.256 | 3.867 |
| Ammonia (as N) | 845.100 | 371.500 |
| Combined metals | 1.902 | |
| Total suspended solids | 259.900 | 123.600 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(c) Spent plating solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw material | ||
| Copper | 1.900 | 1.000 |
| Cyanide (total) | 0.290 | 0.120 |
| Zinc | 1.460 | 0.610 |
| Ammonia (as N) | 133.300 | 58.600 |
| Combined metals | 0.300 | |
| Total suspended solids | 41.000 | 19.500 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(d) Spent cyanide stripping solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 7.030 | 3.700 |
| Cyanide (total) | 1.073 | 0.444 |
| Zinc | 5.402 | 2.257 |
| Ammonia (as N) | 493.200 | 216.800 |
| Combined metals | 1.110 | |
| Total suspended solids | 151.700 | 72.150 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(e) Refinery wet air pollution control. 2
2 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 39.900 | 21.000 |
| Cyanide (total) | 6.090 | 2.520 |
| Zinc | 30.660 | 12.810 |
| Ammonia (as N) | 2,799.000 | 1,231.000 |
| Combined metals | 6.300 | |
| Total suspended solids | 861.000 | 409.500 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at alltimes. | ||
(f) Gold solvent extraction raffinate and wash water.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 1.197 | 0.630 |
| Cyanide (total) | 0.183 | 0.076 |
| Zinc | 0.920 | 0.384 |
| Ammonia (as N) | 83.980 | 36.920 |
| Combined metals | 0.189 | |
| Total suspended solids | 25.830 | 12.290 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(g) Gold spent electrolyte.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.017 | 0.009 |
| Cyanide (total) | 0.003 | 0.001 |
| Zinc | 0.103 | 0.005 |
| Ammonia (as N) | 1.160 | 0.510 |
| Combined metals | 0.003 | |
| Total suspended solids | 0.357 | 0.170 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(h) Gold precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 8.360 | 4.400 |
| Cyanide (total) | 1.276 | 0.528 |
| Zinc | 6.424 | 2.684 |
| Ammonia (as N) | 586.500 | 257.800 |
| Combined metals | 1.320 | |
| Total suspended solids | 180.400 | 85.800 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(i) Platinum precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 9.880 | 5.200 |
| Cyanide (total) | 1.508 | 0.624 |
| Zinc | 7.592 | 3.172 |
| Ammonia (as N) | 693.200 | 304.700 |
| Combined metals | 1.560 | |
| Total suspended solids | 213.200 | 101.400 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(j) Palladium precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of palladium precipitated | ||
| Copper | 11.400 | 6.000 |
| Cyanide (total) | 1.740 | 0.720 |
| Zinc | 8.760 | 3.660 |
| Ammonia (as N) | 799.800 | 351.600 |
| Combined metals | 1.800 | |
| Total suspended solids | 246.000 | 117.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(k) Other platinum group metals precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 9.880 | 5.200 |
| Cyanide (total) | 1.508 | 0.624 |
| Zinc | 7.592 | 3.172 |
| Ammonia (as N) | 693.200 | 304.700 |
| Combined metals | 1.560 | |
| Total suspended solids | 213.200 | 101.400 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(l) Spent solution from PGC salt production.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.710 | 0.900 |
| Cyanide (total) | 0.261 | 0.108 |
| Zinc | 1.314 | 0.549 |
| Ammonia (as N) | 120.000 | 52.740 |
| Combined metals | 0.270 | |
| Total suspended solids | 36.900 | 17.550 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(m) Equipment and floor wash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Ammonia (as N) | 0.000 | 0.000 |
| Combined metals | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(n) Preliminary treatment.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 95.000 | 50.000 |
| Cyanide (Total) | 14.500 | 6.000 |
| Zinc | 73.000 | 30.500 |
| Ammonia (as N) | 6665.000 | 2930.000 |
| Combined Metals | 15.000 | |
| Total Suspended Solids | 2050.000 | 975.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31705, 31706, Aug. 3, 1990]
§421.263 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) Furnace wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 5.760 | 2.745 |
| Cyanide (total) | 0.900 | 0.360 |
| Zinc | 4.590 | 1.890 |
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals in the granulated raw material | ||
| Copper | 0.819 | 0.390 |
| Cyanide (total) | 0.128 | 0.051 |
| Zinc | 0.653 | 0.269 |
| Combined metals | 0.192 | |
| Palladium | 0.064 | |
| Platinum | 0.064 | |
| Ammonia (as N) | 85.310 | 37.500 |
(c) Spent plating solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw material | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Gold | ||
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent cyanide stripping solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 4.736 | 2.257 |
| Cyanide (total) | 0.740 | 0.296 |
| Zinc | 3.774 | 1.554 |
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery wet air pollution control 2.
2 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 0.806 | 0.384 |
| Cyanide (total) | 0.126 | 0.050 |
| Zinc | 0.643 | 0.265 |
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.0111 | 0.0053 |
| Cyanide (total) | 0.0017 | 0.0007 |
| Zinc | 0.0089 | 0.0037 |
| Combined metals | 0.0030 | |
| Ammonia (as N) | 1.1600 | 0.5100 |
(h) Gold precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 5.632 | 2.684 |
| Cyanide (total) | 0.880 | 0.352 |
| Zinc | 4.488 | 1.848 |
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 0.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of palladium precipitated | ||
| Copper | 7.680 | 3.660 |
| Cyanide (total) | 1.200 | .480 |
| Zinc | 6.120 | 2.520 |
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solutions from PGC salt production.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.152 | 0.549 |
| Cyanide (total) | 0.180 | 0.072 |
| Zinc | 0.918 | 0.378 |
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary treatment.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| Mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 64.000 | 30.500 |
| Cyanide (Total) | 10.000 | 4.000 |
| Zinc | 51.000 | 21.000 |
| Combined metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31706, Aug. 3, 1990; 55 FR 36932, Sept. 7, 1990]
§421.264 Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Furnace wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 5.760 | 2.745 |
| Cyanide (total) | 0.900 | 0.360 |
| Zinc | 4.590 | 1.890 |
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
| Total suspended solids | 67.500 | 54.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(b) Raw material granulation.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals in the granulated raw material | ||
| Copper | 0.819 | 0.390 |
| Cyanide (total) | 0.128 | 0.051 |
| Zinc | 0.653 | 0.269 |
| Combined metals | 0.192 | |
| Ammonia (as N) | 85.310 | 37.500 |
| Total suspended solids | 9.600 | 7.680 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(c) Spent plating solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw material | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
| Total suspended solids | 15.000 | 12.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(d) Spent cyanide stripping solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 4.736 | 2.257 |
| Cyanide (total) | 0.740 | 0.296 |
| Zinc | 3.774 | 1.554 |
| Combined metals | 1.11 | |
| Ammonia (as N) | 493.200 | 216.800 |
| Total suspended solids | 55.500 | 44.400 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(e) Refinery wet air pollution control 2.
2 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
| Total suspended solids | 15.000 | 12.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(f) Gold solvent extraction raffinate and wash water.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 0.806 | 0.384 |
| Cyanide (total) | 0.126 | 0.050 |
| Zinc | 0.643 | 0.265 |
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
| Total suspended solids | 9.450 | 7.560 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(g) Gold spent electrolyte.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.011 | 0.005 |
| Cyanide (total) | 0.002 | 0.001 |
| Combined metals | 0.003 | |
| Zinc | 0.009 | 0.004 |
| Ammonia (as N) | 1.160 | 0.510 |
| Total suspended solids | 0.131 | 0.104 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(h) Gold precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 5.632 | 2.684 |
| Cyanide (total) | 0.880 | 0.352 |
| Zinc | 4.488 | 1.848 |
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
| Total suspended solids | 66.00 | 52.800 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(i) Platinum precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
| Total suspended solids | 78.000 | 62.400 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(j) Palladium precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of palladium precipitated | ||
| Copper | 7.680 | 3.660 |
| Cyanide (total) | 1.200 | 0.480 |
| Zinc | 6.1200 | 2.520 |
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
| Total suspended solids | 90.000 | 72.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.00 at all times. | ||
(k) Other platinum group metals precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
| Total suspended solids | 78.000 | 62.400 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(l) Spent solution from PGC salt production.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.152 | 0.549 |
| Cyanide (total) | 0.180 | 0.072 |
| Zinc | 0.918 | 0.378 |
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
| Total suspended solids | 13.500 | 10.800 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(m) Equipment and floor wash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(n) Preliminary treatment.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 64.000 | 30.500 |
| Cyanide (Total) | 10.000 | 4.000 |
| Zinc | 51.000 | 21.000 |
| Combined metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
| Total Suspended Solids | 750.000 | 600.000 |
| pH | ( 1) | ( 1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31708, Aug. 3, 1990]
§421.265 Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW must not exceed the following values:
(a) Furnace wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 5.760 | 2.745 |
| Cyanide (total) | 0.900 | 0.360 |
| Zinc | 4.590 | 1.890 |
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals in the granulated raw material | ||
| Copper | 0.819 | 0.390 |
| Cyanide (total) | 0.128 | 0.051 |
| Zinc | 0.653 | 0.269 |
| Combined metals | 0.192 | |
| Ammonia (as N) | 85.310 | 37.500 |
(c) Spent plating solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw material | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent Cyanide stripping solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 4.736 | 2.257 |
| Cyanide (total) | 0.740 | 0.296 |
| Zinc | 3.774 | 1.554 |
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery wet air pollution control. 1
1 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 0.806 | 0.384 |
| Cyanide (total) | 0.126 | 0.050 |
| Zinc | 0.643 | 0.265 |
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.011 | 0.005 |
| Cyanide (total) | 0.002 | 0.001 |
| Zinc | 0.009 | 0.004 |
| Combined metals | 0.003 | |
| Ammonia (as N) | 1.160 | 0.510 |
(h) Gold precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 5.632 | 2.684 |
| Cyanide (total) | 0.880 | 0.352 |
| Zinc | 4.488 | 1.848 |
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of palladium precipitated | ||
| Copper | 7.680 | 3.660 |
| Cyanide (total) | 1.200 | 0.480 |
| Zinc | 6.120 | 2.520 |
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solution from PGC salt production.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.152 | 0.549 |
| Cyanide (total) | 0.180 | 0.072 |
| Zinc | 0.918 | 0.378 |
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary Treatment.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| Mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 64.000 | 30.500 |
| Cyanide (Total) | 10.000 | 4.000 |
| Zinc | 51.000 | 21.000 |
| Combined Metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31710, 31711, Aug. 3, 1990]
§421.266 Pretreatment standards for new sources.
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW shall not exceed the following values:
(a) Furnace wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 5.760 | 2.745 |
| Cyanide (total) | 0.900 | 0.360 |
| Zinc | 4.590 | 1.890 |
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, in the granulated raw material | ||
| Copper | 0.819 | 0.390 |
| Cyanide (total) | 0.128 | 0.051 |
| Zinc | 0.653 | 0.269 |
| Combined metals | 0.192 | |
| Ammonia | 85.310 | 37.500 |
(c) Spent plating solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw materail | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent cyanide stripping solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 4.736 | 2.257 |
| Cyanide (total) | 0.740 | 0.296 |
| Zinc | 3.774 | 1.554 |
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery Wet Air Pollution Control. 1
1 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 1.280 | 0.610 |
| Cyanide (total) | 0.200 | 0.080 |
| Zinc | 1.020 | 0.420 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 0.806 | 0.384 |
| Cyanide (total) | 0.126 | 0.050 |
| Zinc | 0.643 | 0.265 |
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.011 | 0.005 |
| Cyanide (total) | 0.002 | 0.001 |
| Zinc | 0.009 | 0.004 |
| Combined metals | 0.300 | |
| Ammonia (as N) | 1.160 | 0.510 |
(h) Gold precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 5.632 | 2.684 |
| Cyanide (total) | 0.880 | 0.352 |
| Zinc | 4.488 | 1.848 |
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 7.680 | 3.660 |
| Cyanide (Total) | 1.200 | 0.480 |
| Zinc | 6.120 | 2.520 |
| Combined Metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 6.656 | 3.172 |
| Cyanide (total) | 1.040 | 0.416 |
| Zinc | 5.304 | 2.184 |
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solution from PGC salt production.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.152 | 0.549 |
| Cyanide (total) | 0.180 | 0.072 |
| Zinc | 0.918 | 0.378 |
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary treatment.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly averge |
|---|---|---|
| mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 64.000 | 30.500 |
| Cyanide (Total) | 10.000 | 4.000 |
| Zinc | 51.000 | 21.000 |
| Combined Metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31711, Aug. 3, 1990]
§421.267 [Reserved]
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