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Title 40: Protection of Environment
CHAPTER I: ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
SUBCHAPTER N: EFFLUENT GUIDELINES AND STANDARDS
PART 421: NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
Subpart L: Secondary Silver Subcategory
421.124 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Subpart L?Film Stripping.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver from film stripping | ||
| Copper | 64.450 | 30.720 |
| Zinc | 51.360 | 21.150 |
| Ammonia (as N) | 6,712.000 | 2,951.000 |
| Total suspended solids | 755.300 | 604.200 |
| pH | (1) | (1) |
(b) Subpart L?Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| 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 | 1.242 | .592 |
| Zinc | .990 | .408 |
| Ammonia (as N) | 129.300 | 56.840 |
| Total suspended solids | 14.550 | 11.640 |
| pH | (1) | (1) |
(c) Subpart L?Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver precipitated | ||
| Copper | 73.690 | 35.120 |
| Zinc | 58.720 | 24.180 |
| Ammonia (as N) | 7,674.000 | 3,374.000 |
| Total suspended solids | 863.600 | 690.900 |
| pH | (1) | (1) |
(d) Subpart L?Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver precipitated | ||
| Copper | 34.048 | 16.226 |
| Zinc | 27.132 | 11.172 |
| Ammonia (as N) | 3,545.000 | 1,559.000 |
| Total suspended solids | 399.000 | 319.200 |
| pH | (1) | (1) |
(e) Subpart L?Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| 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 | 15.540 | 7.406 |
| Zinc | 12.380 | 5.099 |
| Ammonia (as N) | 1,618.000 | 711.400 |
| Total suspended solids | 182.100 | 145.700 |
| pH | (1) | (1) |
(f) Subpart L?Electrolytic Refining.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver from electrolytic refining | ||
| Copper | .973 | .464 |
| Zinc | .775 | .319 |
| Ammonia (as N) | 101.300 | 44.540 |
| Total suspended solids | 11.400 | 9.120 |
| pH | (1) | (1) |
(g) Subpart L?Furnace Wet Air Pollution Control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver roasted, smelted, or dried | ||
| Copper | .000 | .000 |
| Zinc | .000 | .000 |
| Ammonia (as N) | .000 | .000 |
| Total suspended solids | .000 | .000 |
| pH | (1) | (1) |
(h) Subpart L?Leaching.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver produced from leaching | ||
| Copper | .110 | .053 |
| Zinc | .088 | .036 |
| Ammonia (as N) | 11.470 | 5.040 |
| Total suspended solids | 1.290 | 1.032 |
| pH | (1) | (1) |
(i) Subpart L?Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| 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 | 5.671 | 2.703 |
| Zinc | 4.519 | 1.861 |
| Ammonia (as N) | 590.500 | 259.600 |
| Total suspended solids | 66.450 | 53.160 |
| pH | (1) | (1) |
(j) Subpart L?Precipitation and Filtration of Nonphotograhic Solutions.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver precipitated | ||
| Copper | 3.930 | 1.873 |
| Zinc | 3.132 | 1.290 |
| Ammonia (as N) | 409.300 | 179.900 |
| Total suspended solids | 46.050 | 36.840 |
| pH | (1) | (1) |
(k) Subpart L?Floor and Equipment Washdown.
| 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) |
[49 FR 8821, Mar. 8, 1984, as amended at 49 FR 29795, July 24, 1984]
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