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 for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
(a) Rolling spent neat oils--subpart H--BPT. There shall be no discharge of process wastewater pollutants.
(b) Rolling spent emulsions.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc rolled with emulsions
---------------------------Chromium.................................... 0.0006 0.0003Copper...................................... 0.003 0.002Cyanide..................................... 0.0004 0.0002Zinc........................................ 0.002 0.0009Oil and grease.............................. 0.028 0.017TSS......................................... 0.057 0.027pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(c) Rolling contact cooling water.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc rolled with contact
cooling water
---------------------------Chromium.................................... 0.236 0.0097Copper...................................... 1.02 0.536Cyanide..................................... 0.156 0.065Zinc........................................ 0.783 0.327Oil and grease.............................. 10.7 6.43TSS......................................... 22.0 10.5pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(d) Drawing spent emulsions.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc drawn with emulsions
---------------------------Chromium.................................... 0.003 0.001Copper...................................... 0.011 0.006Cyanide..................................... 0.002 0.0007Zinc........................................ 0.009 0.004Oil and grease.............................. 0.116 0.070TSS......................................... 0.238 0.113pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(e) Direct chill casting contact cooling water.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc cast by the direct
chill method
---------------------------Chromium.................................... 0.222 0.091Copper...................................... 0.960 0.505Cyanide..................................... 0.147 0.061Zinc........................................ 0.738 0.308Oil and grease.............................. 10.1 6.06TSS......................................... 20.7 9.85pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(f) Stationary casting contact cooling water--subpart H--BPT. There shall be no discharge of process wastewater pollutants.
(g) Heat treatment contact cooling water.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc heat treated
---------------------------Chromium.................................... 0.336 0.138Copper...................................... 1.45 0.763Cyanide..................................... 0.221 0.092Zinc........................................ 1.12 0.466Oil and grease.............................. 15.3 9.16TSS......................................... 31.3 14.9pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(h) Surface treatment spent baths.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc surface treated
---------------------------Chromium.................................... 0.039 0.016Copper...................................... 0.169 0.089Cyanide..................................... 0.026 0.011Zinc........................................ 0.130 0.054Oil and grease.............................. 1.78 1.07TSS......................................... 3.64 1.73pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(i) Surface treatment rinse.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc surface treated
---------------------------Chromium.................................... 1.58 0.645Copper...................................... 6.80 3.58Cyanide..................................... 1.04 0.430Zinc........................................ 5.23 2.19Oil and grease.............................. 71.6 43.0TSS......................................... 147 69.8pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(j) Alkaline cleaning spent baths.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc alkaline cleaned
---------------------------Chromium.................................... 0.002 0.0007Copper...................................... 0.007 0.004Cyanide..................................... 0.001 0.0004Zinc........................................ 0.005 0.002Oil and grease.............................. 0.071 0.043TSS......................................... 0.146 0.069pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(k) Alkaline cleaning rinse.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc alkaline cleaned
---------------------------Chromium.................................... 0.744 0.304Copper...................................... 3.21 1.69Cyanide..................................... 0.490 0.203Zinc........................................ 2.47 1.03Oil and grease.............................. 33.8 20.3TSS......................................... 69.3 33.0pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(l) Sawing or grinding spent emulsions.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc sawed or ground with
emulsions
---------------------------Chromium.................................... 0.011 0.005Copper...................................... 0.045 0.024Cyanide..................................... 0.007 0.003Zinc........................................ 0.035 0.015Oil and grease.............................. 0.476 0.286TSS......................................... 0.976 0.464pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(m) Electrocoating rinse.
Subpart H--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
zinc electrocoated
---------------------------Chromium.................................... 1.01 0.412Copper...................................... 4.35 2.29Cyanide..................................... 0.664 0.275Zinc........................................ 3.35 1.40Oil and grease.............................. 45.8 27.5TSS......................................... 93.9 44.7pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(n) Degreasing spent solvents--subpart H--BPT. There shall be no discharge of process wastewater pollutants. [50 FR 34270, Aug. 23, 1985; 51 FR 2888, Jan. 22, 1986]