40 CFR 467.32: 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 representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:

Subpart C

Core

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 extruded

Chromium 0.16 0.066

Cyanide 0.11 0.044

Zinc 0.53 0.22

Aluminum 2.34 1.16

Oil and grease 7.32 4.39

Suspended solids 15.0 7.13

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart C

Extrusion Press Leakage

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 extruded

Chromium 0.65 0.27

Cyanide 0.43 0.18

Zinc 2.16 0.90

Aluminum 9.51 4.73

Oil and grease 29.56 17.74

Suspended solids 60.60 28.82

pH (1) (1)

1 With the range of 7.0 to 10.0 at all times.

Subpart C

Direct Chill Casting 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 cast

Chromium 0.59 0.24

Cyanide 0.39 0.16

Zinc 1.94 0.81

Aluminum 8.55 4.26

Oil and grease 26.58 15.95

Suspended solids 54.49 25.92

pH (1) (1)

1 The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times.

Subpart C

Press 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 10.0 at all times.

Subpart C

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 10.0 at all times.

Subpart C

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 0.26 0.109

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 10.0 at all times.

Subpart C

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 10.0 at all times.

Subpart C

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 10.0 at all times.

Subpart C

Degassing 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 degassed

Chromium 1.15 0.47

Cyanide 0.76 0.32

Zinc 3.81 1.59

Aluminum 16.78 8.35

Oil and grease 52.18 31.31

Suspended solids 106.97 50.88

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.