Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and by August 23, 1988 achieve the following pretreatment standards for existing sources (PSES). 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—PSES 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—PSE. There shall be no discharge of process wastewater pollutants. (c) Forging contact cooling water. Subpart B—PSES Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of 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—PSES 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—PSES 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 Chromiun 1.74 0.711 Zinc 5.77 2.41 Ammonia 527 232 Fluoride 235 105 (f) Surface treatment spent baths. Subpart B—PSES 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 Chromiun 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—PSES 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 Chromiun 0.832 0.340 Zinc 2.76 1.16 Ammonia 252 111 Fluoride 113 49.9 (h) Sawing or grinding spent emulsions. Subpart B—PSES 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 Chromiun 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—PSES. There shall be no discharge of process wastewater pollutants. (j) Wet air pollution control scrubber blowdown. Subpart B—PSES 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 8.25 36.3 Fluoride 36.9 16.4 [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]