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 0.014Zinc........................................ 0.109 0.046Ammonia..................................... 9.95 4.37Fluoride.................................... 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 0.052Zinc........................................ 0.422 0.177Ammonia..................................... 38.5 17.0Fluoride.................................... 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 0.0007Zinc......................................... 0.006 0.003Ammonia...................................... 0.532 0.234Fluoride..................................... 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 0.711Zinc........................................ 5.77 2.41Ammonia..................................... 527 232Fluoride.................................... 235 105------------------------------------------------------------------------
(f) Surface treatment spent baths.
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 0.084Zinc........................................ 0.681 0.285Ammonia..................................... 62.1 27.3Fluoride.................................... 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 0.340Zinc........................................ 2.76 1.16Ammonia..................................... 252 111Fluoride.................................... 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 0.004Zinc........................................ 0.029 0.012Ammonia..................................... 2.60 1.15Fluoride.................................... 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 0.112Zinc........................................ 0.904 0.378Ammonia..................................... 82.5 36.3Fluoride.................................... 36.9 16.4------------------------------------------------------------------------