Any new source subject to this subpart must achieve the following performance standards.
(a) There shall be no discharge allowance for wastewater pollutants from the degassing operation.
(b) The discharge of wastewater pollutants from the core and ancillary operations except those listed in paragraph (a) shall not exceed the values set forth below:
Subpart C
Core
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum extruded | ||
| Chromium | 0.13 | 0.051 |
| Cyanide | 0.068 | 0.027 |
| Zinc | 0.35 | 0.14 |
| Aluminum | 2.07 | 0.92 |
| Oil and grease | 3.39 | 3.39 |
| Suspended solids | 5.10 | 4.07 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Extrusion Press Leakage
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum extruded | ||
| Chromium | 0.11 | 0.045 |
| Cyanide | 0.060 | 0.024 |
| Zinc | 0.31 | 0.126 |
| Aluminum | 1.82 | 0.81 |
| Oil and grease | 2.98 | 2.98 |
| Suspended solids | 4.47 | 3.58 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Direct Chill Casting Contact Cooling Water
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum cast by semicontinuous methods | ||
| Chromium | 0.49 | 0.20 |
| Cyanide | 0.27 | 0.11 |
| Zinc | 1.36 | 0.56 |
| Aluminum | 8.12 | 3.60 |
| Oil and grease | 13.29 | 13.29 |
| Suspended solids | 19.94 | 15.95 |
| pH | (1) | (1) |
1The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times.
Subpart C
Press Heat Treatment Contact Cooling Water
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum quenched | ||
| Chromium | 0.76 | 0.31 |
| Cyanide | 0.41 | 0.17 |
| Zinc | 2.08 | 0.86 |
| Aluminum | 12.45 | 5.52 |
| Oil and grease | 20.37 | 20.37 |
| Suspended solids | 30.56 | 24.45 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Solution Heat Treatment Contact Cooling Water
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum quenched | ||
| Chromium | 0.76 | 0.31 |
| Cyanide | 0.41 | 0.17 |
| Zinc | 2.08 | 0.86 |
| Aluminum | 12.45 | 5.52 |
| Oil and grease | 20.37 | 20.37 |
| Suspended solids | 30.56 | 24.45 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Cleaning or Etching Bath
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
| Chromium | 0.067 | 0.027 |
| Cyanide | 0.036 | 0.015 |
| Zinc | 0.183 | 0.075 |
| Aluminum | 1.094 | 0.485 |
| Oil and grease | 1.79 | 1.79 |
| Suspended solids | 2.69 | 2.15 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Cleaning or Etching Rinse
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
| Chromium | 0.52 | 0.21 |
| Cyanide | 0.28 | 0.11 |
| Zinc | 1.42 | 0.59 |
| Aluminum | 8.50 | 3.77 |
| Oil and grease | 13.91 | 13.91 |
| Suspended solids | 20.87 | 16.70 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
Subpart C
Cleaning or Etching Scrubber Liquor
| Pollutant or pollutant property | NSPS | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
| Chromium | 0.72 | 0.29 |
| Cyanide | 0.39 | 0.16 |
| Zinc | 1.97 | 0.81 |
| Aluminum | 11.81 | 5.24 |
| Oil and grease | 19.33 | 19.33 |
| Suspended solids | 29.00 | 23.20 |
| pH | (1) | (1) |
1Within the range of 7.0 to 10.0 at all times.
[48 FR 49149, Oct. 24, 1983; 49 FR 11633, 11634, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]
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