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40 C.F.R. § 421.262

Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

§ 421.262 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of precious metals, including silver, incinerated or smelted
Copper136.40071.800
Cyanide (total)20.8208.616
Zinc104.80043.800
Ammonia (as N)9,571.0004,207.000
Combined metals21.54
Total suspended solids2,944.0001,400.000
pH( 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

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of precious metal in the granulated raw material
Copper12.0506.340
Cyanide (total)1.8390.761
Zinc9.2563.867
Ammonia (as N)845.100371.500
Combined metals1.902
Total suspended solids259.900123.600
pH( 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

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/liter of spent plating solution used as a raw material
Copper1.9001.000
Cyanide (total)0.2900.120
Zinc1.4600.610
Ammonia (as N)133.30058.600
Combined metals0.300
Total suspended solids41.00019.500
pH( 1)( 1)
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