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§ 471.81 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
(a) Rolling spent neat oils—subpart H—BPT. There shall be no discharge of process wastewater pollutants.
(b) Rolling spent emulsions.
Subpart H—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc rolled with emulsions | ||
| Chromium | 0.0006 | 0.0003 |
| Copper | 0.003 | 0.002 |
| Cyanide | 0.0004 | 0.0002 |
| Zinc | 0.002 | 0.0009 |
| Oil and grease | 0.028 | 0.017 |
| TSS | 0.057 | 0.027 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(c) Rolling contact cooling water.
Subpart H—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc rolled with contact cooling water | ||
| Chromium | 0.236 | 0.0097 |
| Copper | 1.02 | 0.536 |
| Cyanide | 0.156 | 0.065 |
| Zinc | 0.783 | 0.327 |
| Oil and grease | 10.7 | 6.43 |
| TSS | 22.0 | 10.5 |
| pH | ( 1) | ( 1) |