40 CFR 467.12: Effluent limitations 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 must achieve the following effluent limitations for the core operation and for the ancillary operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:

Subpart A

Core With an Annealing Furnace Scrubber

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum rolled with neat oils

Chromium 0.0360 0.0147

Cyanide 0.0237 0.0098

Zinc 0.119 0.0498

Aluminum 0.525 0.257

Oil and grease 1.634 0.980

Suspended solids 3.348 1.593

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Core Without an Annealing Furnace Scrubber

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum rolled with neat oils

Chromium 0.0244 0.010

Cyanide 0.0161 0.0067

Zinc 0.0808 0.0338

Aluminum 0.356 0.174

Oil and grease 1.11 0.664

Suspended solids 2.27 1.079

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Continuous Sheet Casting Spent Lubricant

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum sheet cast by continuous methods

Chromium 0.00086 0.00035

Cyanide 0.00057 0.00024

Zinc 0.0029 0.0012

Aluminum 0.0127 0.0063

Oil and grease 0.0393 0.0236

Suspended solids 0.0805 0.0383

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Solution Heat Treatment Contact Cooling Water

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum quenched

Chromium 3.39 1.39

Cyanide 2.24 0.93

Zinc 11.25 4.70

Aluminum 49.55 24.66

Oil and grease 154.10 92.46

Suspended solids 315.91 150.25

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Cleaning or Etching Bath

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 0.079 0.032

Cyanide 0.052 0.022

Zinc 0.262 0.110

Aluminum 1.15 0.573

Oil and grease 3.58 2.15

Suspended solids 7.34 3.49

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Cleaning or Etching Rinse

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 6.12 2.51

Cyanide 4.04 1.67

Zinc 20.31 8.49

Aluminum 89.46 44.52

Oil and grease 278.24 166.95

Suspended solids 570.39 271.29

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.

Subpart A

Cleaning or Etching Scrubber Liquor

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 7.00 2.86

Cyanide 4.61 1.91

Zinc 23.22 9.70

Aluminum 102.24 50.88

Oil and grease 318.00 190.80

Suspended solids 651.90 310.05

pH (1) (1)

1 Within the range of 7.0 to 10 at all times.