New source performance standards (NSPS).

Any new source subject to this subpart must achieve the following new source performance standards. The mass of pollutants in the magnesium forming process wastewater shall not exceed the following values: (a) Rolling spent emulsions. Subpart B—NSPS 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 0.028 0.011 Zinc 0.076 0.032 Ammonia 9.95 4.37 Fluoride 4.44 1.97 Oil and grease 0.746 0.746 TSS 1.12 0.895 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (b) Forging spent lubricants—subpart B—NSPS. There shall be no discharge of process wastewater pollutants. (c) Forging contact cooling water. Subpart B—NSPS 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 0.107 0.044 Zinc 0.295 0.122 Ammonia 38.5 17.0 Fluoride 17.2 7.63 Oil and grease 2.89 2.89 TSS 4.34 3.47 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (d) Forging equipment cleaning wastewater. Subpart B—NSPS 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 0.0006 Zinc 0.004 0.002 Ammonia 0.532 0.234 Fluoride 0.238 0.106 Oil and grease 0.040 0.040 TSS 0.060 0.048 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (e) Direct chill casting contact cooling water. Subpart B—NSPS 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 1.46 0.593 Zinc 4.03 1.66 Ammonia 527 232 Fluoride 235 105 Oil and grease 39.5 39.5 TSS 59.3 47.4 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (f) Surface treatment spent baths. Subpart B—NSPS 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 0.173 0.070 Zinc 0.476 0.196 Ammonia 62.1 27.3 Fluoride 27.8 12.3 Oil and grease 4.66 4.66 TSS 6.99 5.60 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times (g) Surface treatment rinse. Subpart B—NSPS Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pound pers million off-pounds) of magnesium surface treated Chromium 0.700 0.284 Zinc 1.93 0.794 Ammonia 252 111 Fluoride 113 49 Oil and grease 18.9 18.9 TSS 28.4 22.7 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times (h) Sawing or grinding spent emulsions. Subpart B—NSPS 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 0.007 0.003 Zinc 0.020 0.008 Ammonia 2.60 1.15 Fluoride 1.16 0.515 Oil and grease 0.195 0.195 TSS 0.293 0.234 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (i) Degreasing spent Solvents—subpart B—NSPS. There shall be no discharge of process wastewater pollutants. (j) Wet air pollution control scrubber blowdown. Subpart B—NSPS 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 0.229 0.093 Zinc 0.632 0.260 Ammonia 82.5 36.3 Fluoride 36.9 16.4 Oil and grease 6.19 6.19 TSS 9.29 7.43 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]