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------------------------------------------------------------------------
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--PSE. There shall be no discharge of process wastewater pollutants.
(c) Forging contact cooling water.
Subpart B--PSES------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
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--PSES------------------------------------------------------------------------
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--PSES------------------------------------------------------------------------
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
---------------------------Chromiun.................................... 1.74 0.711Zinc........................................ 5.77 2.41Ammonia..................................... 527 232Fluoride.................................... 235 105------------------------------------------------------------------------
(f) Surface treatment spent baths.
Subpart B--PSES------------------------------------------------------------------------
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
---------------------------Chromiun.................................... 0.205 0.084Zinc........................................ 0.681 0.285Ammonia..................................... 62.1 27.3Fluoride.................................... 27.8 12.3------------------------------------------------------------------------
(g) Surface treatment rinse.
Subpart B--PSES------------------------------------------------------------------------
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
---------------------------Chromiun.................................... 0.832 0.340Zinc........................................ 2.76 1.16Ammonia..................................... 252 111Fluoride.................................... 113 49.9------------------------------------------------------------------------
(h) Sawing or grinding spent emulsions.
Subpart B--PSES------------------------------------------------------------------------
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
---------------------------Chromiun.................................... 0.009 0.004Zinc........................................ 0.029 0.012Ammonia..................................... 2.60 1.15Fluoride.................................... 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------------------------------------------------------------------------
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..................................... 8.25 36.3Fluoride.................................... 36.9 16.4------------------------------------------------------------------------ [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]