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

§ 471.41 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology 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

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals rolled with emulsions
Chromium0.0260.012
Copper0.1470.077
Cyanide0.0230.010
Silver0.0320.013
Oil and grease1.540.925
TSS3.161.51
pH( 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

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals drawn with emulsions
Cadmium0.0160.007
Copper0.0910.048
Cyanide0.0140.006
Silver0.0200.008
Oil and grease0.9500.570
TSS1.950.926
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(e) Drawing spent soap solutions.

Subpart D—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals drawn with soap solutions
Cadmium0.0010.0005
Copper0.0060.003
Cyanide0.00090.0004
Silver0.0010.0006
Oil and grease0.0630.038
TSS0.1280.061
pH( 1)( 1)
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