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 neat oils--subpart D--BAT. There shall be no discharge of wastewater pollutants.
(b) Rolling spent emulsions.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals rolled
with emulsions
--------------------------Cadmium...................................... 0.026 0.012Copper....................................... 0.147 0.077Cyanide...................................... 0.023 0.010Silver....................................... 0.032 0.013------------------------------------------------------------------------
(c) Drawing spent neat oils--subpart D--BAT. There shall be no discharge of process wastewater pollutants.
(d) Drawing spent emulsions.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals drawn
with emulsions
-------------------------Cadmium....................................... 0.016 0.007Copper........................................ 0.091 0.048Cyanide....................................... 0.014 0.006Silver........................................ 0.020 0.008------------------------------------------------------------------------
(e) Drawing spent soap solutions.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals drawn with
soap solutions
---------------------------Cadmium..................................... 0.001 0.0005Copper...................................... 0.006 0.003Cyanide..................................... 0.0009 0.0004Silver...................................... 0.002 0.0006------------------------------------------------------------------------
(f) Metal powder production wet atomization wastewater.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals powder wet
atomized
---------------------------Cadmium..................................... 2.27 1.00Copper...................................... 12.7 6.68Cyanide..................................... 1.94 0.802Silver...................................... 2.74 1.14------------------------------------------------------------------------
(g) Heat treatment contact cooling water.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals heat
treated
-------------------------Cadmium....................................... 0.142 0.063Copper........................................ 0.793 0.417Cyanide....................................... 0.121 0.050Silver........................................ 0.171 0.071------------------------------------------------------------------------
(h) Semi-continuous and continuous casting contact cooling water.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals cast by
the semi-continuous or
continuous method
---------------------------Cadmium..................................... 0.350 0.155Copper...................................... 1.96 1.03Cyanide..................................... 0.299 0.124Silver...................................... 0.423 0.175------------------------------------------------------------------------
(i) Stationary casting contact cooling water--subpart D--BAT. There shall be no discharge of process wastewater pollutants.
(j) Direct chill casting contact cooling water.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals cast by the
direct chill method
----------------------------Cadmium.................................... 0.3676 0.162Copper..................................... 2.05 1.08Cyanide.................................... 0.313 0.130Silver..................................... 0.443 0.184------------------------------------------------------------------------
(k) Shot casting contact cooling water.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals shot
cast
-------------------------Cadmium....................................... 0.125 0.055Copper........................................ 0.698 0.367Cyanide....................................... 0.107 0.044Silver........................................ 0.151 0.063------------------------------------------------------------------------
(l) Wet air pollution control scrubber blowdown--subpart D--BAT. There shall be no discharge of process wastewater pollutants.
(m) Pressure bonding contact cooling water.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metal and base
metal pressure bonded
--------------------------Cadmium...................................... 0.0297 0.013Copper....................................... 0.159 0.084Cyanide...................................... 0.0247 0.010Silver....................................... 0.0342 0.014------------------------------------------------------------------------
(n) Surface treatment spent baths.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals surface
treated
-------------------------Cadmium....................................... 0.033 0.015Copper........................................ 0.183 0.097Cyanide....................................... 0.028 0.012Silver........................................ 0.040 0.017------------------------------------------------------------------------
(o) Surface treatment rinse.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals surface
treated
--------------------------Cadmium...................................... 0.210 0.093Copper....................................... 1.17 0.616Cyanide...................................... 0.179 0.074Silver....................................... 0.253 0.105------------------------------------------------------------------------
(p) Alkaline cleaning spent baths.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals alkaline
cleaned
-------------------------Cadmium....................................... 0.021 0.009Copper........................................ 0.114 0.060Cyanide....................................... 0.018 0.007Silver........................................ 0.025 0.010------------------------------------------------------------------------
(q) Alkaline cleaning rinse.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals alkaline
cleaned
---------------------------Cadmium..................................... 0.381 0.168Copper...................................... 2.13 1.12Cyanide..................................... 0.325 0.135Silver...................................... 0.459 0.191------------------------------------------------------------------------
(r) Alkaline cleaning prebonding wastewater.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metal and base
metal cleaned prior to
bonding
--------------------------Cadmium...................................... 0.400 0.174Copper....................................... 2.210 1.16Cyanide...................................... 0.337 0.139Silver....................................... 0.476 0.197------------------------------------------------------------------------
(s) Tumbling or burnishing wastewater.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals tumbled
or burnished
--------------------------Cadmium...................................... 0.412 0.182Copper....................................... 2.300 1.21Cyanide...................................... 0.351 0.145Silver....................................... 0.496 0.206------------------------------------------------------------------------
(t) Sawing or grinding spent neat oils--subpart D--BAT. There shall be no discharge of process wastewater pollutants.
(u) Sawing or grinding spent emulsions.
Subpart D--BAT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals sawed or
ground with emulsions
--------------------------Cadmium...................................... 0.0327 0.014Copper....................................... 0.178 0.094Cyanide...................................... 0.0277 0.011Silver....................................... 0.0381 0.016------------------------------------------------------------------------
(v) Degreasing spent solvents--subpart D--BAT. There shall be no discharge of process wastewater pollutants. [50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986]