Pretreatment standards for new sources (PSNS).

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources (PSNS). The mass of wastewater pollutants in magnesium forming process wastewater introduced into a POTW shall not exceed the following values: (a) Rolling spent emulsions. Subpart B—PSNS 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 (b) Forging spent lubricants—subpart B—PSNS. There shall be no discharge of process wastewater pollutants. (c) Forging contact cooling water. Subpart B—PSNS 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 (d) Forging equipment cleaning wastewater. Subpart B—PSNS 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 (e) Direct chill casting contact cooling water. Subpart B—PSNS 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 (f) Surface treatment spent baths. Subpart B—PSNS 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 (g) Surface treatment rinse. Subpart B—PSNS 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 0.700 0.284 Zinc 1.93 0.794 Ammonia 252 111 Fluoride 113 49.9 (h) Sawing or grinding spent emulsions. Subpart B—PSNS 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 (i) Degreasing spent solvents—subpart B—PSNS. There shall be no discharge of process wastewater pollutants. (j) Wet air pollution control scrubber blowdown. Subpart B—PSNS 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 [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]