Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:
(a) Furnace wet air pollution control.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
incinerated or smelted
--------------Copper........................................ 136.400 71.800Cyanide (total)............................... 20.820 8.616Zinc.......................................... 104.800 43.800Ammonia (as N)................................ 9,571.000 4,207.000Combined metals............................... 21.54 ...........Total suspended solids........................ 2,944.000 1,400.000pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(b) Raw material granulation.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metal in the
granulated raw material
--------------Copper........................................ 12.050 6.340Cyanide (total)............................... 1.839 0.761Zinc.......................................... 9.256 3.867Ammonia (as N)................................ 845.100 371.500Combined metals............................... 1.902 ...........Total suspended solids........................ 259.900 123.600pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(c) Spent plating solutions.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/liter of spent
plating solution used as
a raw material
--------------Copper........................................ 1.900 1.000Cyanide (total)............................... 0.290 0.120Zinc.......................................... 1.460 0.610Ammonia (as N)................................ 133.300 58.600Combined metals............................... 0.300 ...........Total suspended solids........................ 41.000 19.500pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(d) Spent cyanide stripping solutions.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by cyanide
stripping
--------------Copper........................................ 7.030 3.700Cyanide (total)............................... 1.073 0.444Zinc.......................................... 5.402 2.257Ammonia (as N)................................ 493.200 216.800Combined metals............................... 1.110 ...........Total suspended solids........................ 151.700 72.150pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(e) Refinery wet air pollution control.\2\---------------------------------------------------------------------------
\2\ This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
produced in refinery
--------------Copper........................................ 39.900 21.000Cyanide (total)............................... 6.090 2.520Zinc.......................................... 30.660 12.810Ammonia (as N)................................ 2,799.000 1,231.000Combined metals............................... 6.300 ...........Total suspended solids........................ 861.000 409.500pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at alltimes.
(f) Gold solvent extraction raffinate and wash water.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by solvent
extraction
--------------Copper........................................ 1.197 0.630Cyanide (total)............................... 0.183 0.076Zinc.......................................... 0.920 0.384Ammonia (as N)................................ 83.980 36.920Combined metals............................... 0.189 ...........Total suspended solids........................ 25.830 12.290pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(g) Gold spent electrolyte.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by electrolysis
--------------Copper........................................ 0.017 0.009Cyanide (total)............................... 0.003 0.001Zinc.......................................... 0.103 0.005Ammonia (as N)................................ 1.160 0.510Combined metals............................... 0.003 ...........Total suspended solids........................ 0.357 0.170pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(h) Gold precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
precipitated
--------------Copper........................................ 8.360 4.400Cyanide (total)............................... 1.276 0.528Zinc.......................................... 6.424 2.684Ammonia (as N)................................ 586.500 257.800Combined metals............................... 1.320 ...........Total suspended solids........................ 180.400 85.800pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(i) Platinum precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
platinum precipitated
--------------Copper........................................ 9.880 5.200Cyanide (total)............................... 1.508 0.624Zinc.......................................... 7.592 3.172Ammonia (as N)................................ 693.200 304.700Combined metals............................... 1.560 ...........Total suspended solids........................ 213.200 101.400pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(j) Palladium precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
palladium precipitated
--------------Copper........................................ 11.400 6.000Cyanide (total)............................... 1.740 0.720Zinc.......................................... 8.760 3.660Ammonia (as N)................................ 799.800 351.600Combined metals............................... 1.800 ...........Total suspended solids........................ 246.000 117.000pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(k) Other platinum group metals precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of other
platinum group metals
precipitated
--------------Copper........................................ 9.880 5.200Cyanide (total)............................... 1.508 0.624Zinc.......................................... 7.592 3.172Ammonia (as N)................................ 693.200 304.700Combined metals............................... 1.560 ...........Total suspended solids........................ 213.200 101.400pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(l) Spent solution from PGC salt production.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
contained in PGC product
--------------Copper........................................ 1.710 0.900Cyanide (total)............................... 0.261 0.108Zinc.......................................... 1.314 0.549Ammonia (as N)................................ 120.000 52.740Combined metals............................... 0.270 ...........Total suspended solids........................ 36.900 17.550pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(m) Equipment and floor wash.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
produced in refinery
--------------Copper........................................ 0.000 0.000Cyanide (total)............................... 0.000 0.000Zinc.......................................... 0.000 0.000Ammonia (as N)................................ 0.000 0.000Combined metals............................... 0.000 0.000Total suspended solids........................ 0.000 0.000pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times.
(n) Preliminary treatment.
BPT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of total
precious metals produced
through this operation
--------------Copper........................................ 95.000 50.000Cyanide (Total)............................... 14.500 6.000Zinc.......................................... 73.000 30.500Ammonia (as N)................................ 6665.000 2930.000Combined Metals............................... 15.000 ...........Total Suspended Solids........................ 2050.000 975.000pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.5 to 10.0 at all times. [50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31705, 31706, Aug. 3, 1990]