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 representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):
(a) Rolling spent emulsions.
Subpart B—BAT
| 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 | ||
| Chromium | 0.033 | 0.014 |
| Zinc | 0.109 | 0.046 |
| Ammonia | 9.95 | 4.37 |
| Fluoride | 4.44 | 1.97 |
(b) Forging spent lubricants—subpart B—BAT. There shall be no discharge of process wastewater pollutants.
(c) Forging contact cooling water.
Subpart B—BAT
| 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 | 0.127 | 0.052 |
| Zinc | 0.422 | 0.177 |
| Ammonia | 38.5 | 17.0 |
| Fluoride | 17.2 | 7.63 |
(d) Forging equipment cleaning wastewater.
Subpart B—BAT
| 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 | 0.002 | 0.0007 |
| Zinc | 0.006 | 0.003 |
| Ammonia | 0.532 | 0.234 |
| Fluoride | 0.238 | 0.106 |
(e) Direct chill casting contact cooling water.
Subpart B—BAT
| 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 |
(f) Surface treatment spent baths.
Subpart B—BAT
| 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 |
(g) Surface treatment rinse.
Subpart B—BAT
| 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 | 0.832 | 0.340 |
| Zinc | 2.76 | 1.16 |
| Ammonia | 252 | 111 |
| Fluoride | 113 | 49.9 |
(h) Sawing or grinding spent emulsions.
Subpart B—BAT
| 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 |
(i) Degreasing spent solvents—subpart B—BAT. There shall be no discharge of process wastewater pollutants.
(j) Wet air pollution control scrubber blowdown.
Subpart B—BAT
| 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 |
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