currently available (BPT).
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 D--BPT. There shall be no discharge of process wastewater pollutants.
(b) Rolling spent emulsions.
Subpart D--BPT------------------------------------------------------------------------
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
---------------------------Chromium.................................... 0.026 0.012Copper...................................... 0.147 0.077Cyanide..................................... 0.023 0.010Silver...................................... 0.032 0.013Oil and grease.............................. 1.54 0.925TSS......................................... 3.16 1.51pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(c) Drawing spent neat oils--subpart D--BPT. There shall be no discharge of process wastewater pollutants.
(d) Drawing spent emulsions.
Subpart D--BPT------------------------------------------------------------------------
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 0.008Oil and grease.............................. 0.950 0.570TSS......................................... 1.95 0.926pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(e) Drawing spent soap solutions.
Subpart D--BPT------------------------------------------------------------------------
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...................................... 0.001 0.0006Oil and grease.............................. 0.063 0.038TSS......................................... 0.128 0.061pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(f) Metal powder production wet atomization wastewater.
Subpart D--BPT------------------------------------------------------------------------
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 6.70Cyanide..................................... 1.94 0.802Silver...................................... 2.70 1.14Oil and grease.............................. 134 80.2TSS......................................... 274 130pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(g) Heat treatment contact cooling water.
Subpart D--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
extruded precious metals
heat treated
---------------------------Cadmium..................................... 1.42 0.626Copper...................................... 7.93 4.17Cyanide..................................... 1.21 0.501Silver...................................... 1.71 0.709Oil and grease.............................. 83.4 50.1TSS......................................... 171 81.3pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(h) Semi-continuous or continuous casting contact cooling water.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 3.50 1.55Copper...................................... 19.6 10.3Cyanide..................................... 2.99 1.24Silver...................................... 4.23 1.75Oil and grease.............................. 206 124TSS......................................... 423 209pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(i) Stationary casting contact cooling water--subpart D--BPT. There shall be no discharge of process wastewater pollutants.
(j) Direct chill casting contact cooling water.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 3.67 1.62Copper...................................... 20.5 10.8Cyanide..................................... 3.13 1.30Silver...................................... 4.43 1.84Oil and grease.............................. 216 130TSS......................................... 443 211pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(k) Shot casting contact cooling water.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 1.25 0.551Copper...................................... 6.98 3.67Cyanide..................................... 1.07 0.441Silver...................................... 1.51 0.624Oil and grease.............................. 73.4 44.1TSS......................................... 151 71.6pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(l) Wet air pollution control scrubber blowdown--subpart D--BPT. There shall be no discharge of process wastewater pollutants.
(m) Pressure bonding contact cooling water.
Subpart D--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals and base
metal pressure bonded
---------------------------Cadmium..................................... 0.029 0.013Copper...................................... 0.159 0.084Cyanide..................................... 0.024 0.010Silver...................................... 0.034 0.014Oil and grease.............................. 1.67 1.00TSS......................................... 3.43 1.63pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(n) Surface treatment spent baths.
Subpart D--BPT------------------------------------------------------------------------
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 0.017Oil and grease.............................. 1.93 1.16TSS......................................... 3.95 1.88pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(o) Surface treatment rinse.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 2.10 0.924Copper...................................... 11.7 5.16Cyanide..................................... 1.79 0.739Silver...................................... 2.53 1.05Oil and grease.............................. 123 73.9TSS......................................... 253 120pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(p) Alkaline cleaning spent baths.
Subpart D--BPT------------------------------------------------------------------------
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 0.010Oil and grease............................... 1.20 0.720TSS.......................................... 2.46 1.170pH........................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(q) Alkaline cleaning rinse.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 3.81 1.68Copper...................................... 21.3 11.2Cyanide..................................... 3.25 1.35Silver...................................... 4.59 1.91Oil and grease.............................. 224 135TSS......................................... 459 219pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(r) Alkaline cleaning prebonding wastewater.
Subpart D--BPT------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (pounds per
million off-pounds) of
precious metals and base
metal cleaned prior to
bonding
---------------------------Cadmium..................................... 3.95 1.74Copper...................................... 22.1 11.6Cyanide..................................... 3.37 1.39Silver...................................... 4.76 1.97Oil and grease.............................. 232 139TSS......................................... 476 226pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(s) Tumbling or burnishing wastewater.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 4.12 1.82Copper...................................... 23.0 12.1Cyanide..................................... 3.51 1.45Silver...................................... 4.96 2.06Oil and grease.............................. 242 145TSS......................................... 496 236pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(t) Sawing or grinding spent neat oils--subpart D--BPT. There shall be no discharge of process wastewater pollutants.
(u) Sawing or grinding spent emulsions.
Subpart D--BPT------------------------------------------------------------------------
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..................................... 0.032 0.014Copper...................................... 0.178 0.094Cyanide..................................... 0.027 0.011Silver...................................... 0.039 0.016Oil and grease.............................. 1.87 1.12TSS......................................... 3.83 1.82pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(v) Degreasing spent solvents--subpart D--BPT. There shall be no discharge of process wastewater pollutants. [50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986]