§ 421.94 Standards of performance for new sources.
Current through Aug 22, 2025 · Read all of Part 421
Any new source subject to this subpart shall achieve the following new source performance standards:
Subpart I—Metallurgical Acid Plant—NSPS
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per/million pounds) of 100 pct sulfuric acid capacity | ||
| Arsenic | 3.550 | 1.584 |
| Cadmium | 0.511 | 0.204 |
| Copper | 3.269 | 1.558 |
| Lead | 0.715 | 0.332 |
| Zinc | 2.605 | 1.073 |
| Fluoride 1 | 89.390 | 50.820 |
| Molybdenum 1 | [Reserved] | [Reserved]. |
| Total suspended solids | 38.310 | 30.650 |
| pH | ( 2) | ( 2) |
1 For Molybdenum acid plants only.
2 Within the range of 7.5 to 10.0 at all times.
[50 FR 38343, Sept. 20, 1985, as amended at 55 FR 31697, Aug. 3, 1990]