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40 C.F.R. § 461.31

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

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

(a) 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 practicable control technology currently available:

(1) Subpart C—Closed Formation—Double Fill, or Fill and Dump.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of lead used
English units—pounds per 1,000,000 pounds of lead used
Copper0.860.45
Lead0.190.090
Iron0.540.27
Oil and grease9.005.40
TSS18.458.78
pH( 1)( 1)

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

(2) Subpart C—Open Formation—Dehydrated.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of lead used
English units—pounds per 1,000,000 pounds of lead used
Copper20.9911.05
Lead4.642.21
Iron16.136.74
Oil and grease221.00132.60
TSS453.05215.47
pH( 1)( 1)
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