40 C.F.R. § 421.122
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:
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT 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 | 1.843 | .970 |
| Zinc | 1.416 | .592 |
| Ammonia (as N) | 129.300 | 56.840 |
| Total suspended solids | 39.770 | 18.920 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT 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 | 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT 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 | 1.273 | .670 |
| Zinc | .978 | .409 |
| Ammonia (as N) | 89.310 | 39.260 |
| Total suspended solids | 27.470 | 13.070 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT 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 | 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| 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) |
1 Within the range of 7.5 to 10.0 at all times.
BPT 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 |
| Total suspended solids | .000 | .000 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
40 C.F.R. §421.122