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§ 421.254 Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Smelter wet air pollution control.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold and silver smelted | ||
| Lead | 0.364 | 0.169 |
| Mercury | 0.195 | 0.078 |
| Silver | 0.377 | 0.156 |
| Zinc | 1.326 | 0.546 |
| Gold | 0.130 | |
| Oil and Grease | 13.000 | 13.000 |
| Total suspended solids | 19.500 | 15.600 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(b) Silver chloride reduction spent solution.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver reduced in solution | ||
| Lead | 0.112 | 0.052 |
| Mercury | 0.060 | 0.024 |
| Silver | 0.116 | 0.048 |
| Zinc | 0.408 | 0.168 |
| Gold | 0.040 | |
| Oil and Grease | 4.000 | 4.000 |
| Total suspended solids | 6.000 | 4.800 |
| pH | ( 1) | ( 1) |