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471.21—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):
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium rolled with emulsions | ||
| Chromiun | 0.033 | 0.014 |
| Zinc | 0.109 | 0.046 |
| Ammonia | 9.95 | 4.37 |
| Fluoride | 4.440 | 1.97 |
| Oil and grease | 1.49 | 0.895 |
| TSS | 3.06 | 1.46 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(b) Forging spent lubricants—Subpart B—BPT.
There shall be no discharge of process wastewater pollutants.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of forged magnesium cooled with water | ||
| Chromium | 1.27 | 0.520 |
| Zinc | 4.22 | 1.77 |
| Ammonia | 385 | 170 |
| Fluoride | 172 | 76.3 |
| Oil and grease | 57.8 | 34.7 |
| TSS | 119 | 56.4 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium forged | ||
| Chromium | 0.018 | 0.007 |
| Zinc | 0.059 | 0.025 |
| Ammonia | 5.32 | 2.34 |
| Fluoride | 2.38 | 1.06 |
| Oil and grease | 0.798 | 0.479 |
| TSS | 1.64 | 0.778 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium cast with direct chill methods | ||
| Chromium | 1.74 | 0.711 |
| Zinc | 5.77 | 2.41 |
| Ammonia | 527 | 232 |
| Fluoride | 235 | 105 |
| Oil and grease | 79.0 | 47.4 |
| TSS | 162 | 77.1 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium surface treated | ||
| Chromium | 0.205 | 0.084 |
| Zinc | 0.681 | 0.285 |
| Ammonia | 62.1 | 27.3 |
| Fluoride | 27.8 | 12.3 |
| Oil and grease | 9.32 | 5.59 |
| TSS | 19.1 | 9.09 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium surface treated | ||
| Chromium | 8.32 | 3.4 |
| Zinc | 27.6 | 11.5 |
| Ammonia | 2520 | 1110 |
| Fluoride | 1130 | 499 |
| Oil and grease | 378 | 227 |
| TSS | 775 | 369 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium sawed or ground | ||
| Chromium | 0.009 | 0.004 |
| Zinc | 0.029 | 0.012 |
| Ammonia | 2.60 | 1.15 |
| Fluoride | 1.16 | 0.515 |
| Oil and grease | 0.390 | 0.234 |
| TSS | 0.800 | 0.381 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(i) Degreasing spent solvents—Subpart B—BPT.
There shall be no discharge of process wastewater pollutants.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium sanded and repaired or forged | ||
| Chromium | 0.273 | 0.112 |
| Zinc | 0.904 | 0.378 |
| Ammonia | 82.5 | 36.3 |
| Fluoride | 36.9 | 16.4 |
| Oil and grease | 12.4 | 7.43 |
| TSS | 25.4 | 12.1 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
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):
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium rolled with emulsions | ||
| Chromiun | 0.033 | 0.014 |
| Zinc | 0.109 | 0.046 |
| Ammonia | 9.95 | 4.37 |
| Fluoride | 4.440 | 1.97 |
| Oil and grease | 1.49 | 0.895 |
| TSS | 3.06 | 1.46 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(b) Forging spent lubricants—subpart B—BPT.
There shall be no discharge of process wastewater pollutants.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of forged magnesium cooled with water | ||
| Chromium | 1.27 | 0.520 |
| Zinc | 4.22 | 1.77 |
| Ammonia | 385 | 170 |
| Fluoride | 172 | 76.3 |
| Oil and grease | 57.8 | 34.7 |
| TSS | 119 | 56.4 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium forged | ||
| Chromium | 0.018 | 0.007 |
| Zinc | 0.059 | 0.025 |
| Ammonia | 5.32 | 2.34 |
| Fluoride | 2.38 | 1.06 |
| Oil and grease | 0.798 | 0.479 |
| TSS | 1.64 | 0.778 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium cast with direct chill methods | ||
| Chromium | 1.74 | 0.711 |
| Zinc | 5.77 | 2.41 |
| Ammonia | 527 | 232 |
| Fluoride | 235 | 105 |
| Oil and grease | 79.0 | 47.4 |
| TSS | 162 | 77.1 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium surface treated | ||
| Chromium | 0.205 | 0.084 |
| Zinc | 0.681 | 0.285 |
| Ammonia | 62.1 | 27.3 |
| Fluoride | 27.8 | 12.3 |
| Oil and grease | 9.32 | 5.59 |
| TSS | 19.1 | 9.09 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium surface treated | ||
| Chromium | 8.32 | 3.4 |
| Zinc | 27.6 | 11.5 |
| Ammonia | 2520 | 1110 |
| Fluoride | 1130 | 499 |
| Oil and grease | 378 | 227 |
| TSS | 775 | 369 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium sawed or ground | ||
| Chromium | 0.009 | 0.004 |
| Zinc | 0.029 | 0.012 |
| Ammonia | 2.60 | 1.15 |
| Fluoride | 1.16 | 0.515 |
| Oil and grease | 0.390 | 0.234 |
| TSS | 0.800 | 0.381 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(i) Degreasing spent solvents—subpart B—BPT.
There shall be no discharge of process wastewater pollutants.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of magnesium sanded and repaired or forged | ||
| Chromium | 0.273 | 0.112 |
| Zinc | 0.904 | 0.378 |
| Ammonia | 82.5 | 36.3 |
| Fluoride | 36.9 | 16.4 |
| Oil and grease | 12.4 | 7.43 |
| TSS | 25.4 | 12.1 |
| pH | (1) | |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
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