[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR471.22] [Page 699-700] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 471--NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY--Table of Contents Subpart B--Magnesium Forming Subcategory Sec. 471.22 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT). 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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. [[Page 700]] Subpart B--BAT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------