40 CFR 467.24: New source performance standards.

Any new source subject to this subpart must achieve the following performance standards. The discharge of process wastewater pollutants from the core shall not exceed the values set forth below:

Subpart B

Core

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.048 0.020

Cyanide 0.026 0.011

Zinc 0.133 0.055

Aluminum 0.80 0.35

Oil and grease 1.30 1.30

Suspended solids 1.95 1.56

pH (1) (1)

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

Subpart B

Direct Chill Casting Contact Cooling Water

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.49 0.20

Cyanide 0.27 0.11

Zinc 1.36 0.56

Aluminum 8.12 3.60

Oil and grease 13.29 13.29

Suspended solids 19.94 15.95

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 B

Solution Heat Treatment Contact Cooling Water

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.76 0.31

Cyanide 0.41 0.17

Zinc 2.08 0.86

Aluminum 12.45 5.52

Oil and grease 20.37 20.37

Suspended solids 30.56 24.45

pH (1) (1)

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

Subpart B

Cleaning or Etching Bath

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.067 0.027

Cyanide 0.036 0.015

Zinc 0.183 0.075

Aluminum 1.094 0.485

Oil and grease 1.79 1.79

Suspended solids 2.69 2.15

pH (1) (1)

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

Subpart B

Cleaning or Etching Rinse

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.52 0.21

Cyanide 0.28 0.11

Zinc 1.42 0.59

Aluminum 8.50 3.77

Oil and grease 13.91 13.91

Suspended solids 20.87 16.70

pH (1) (1)

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

Subpart B

Cleaning or Etching Scrubber Liquor

Pollutant or pollutant property NSPS

Maximum for any 1 day Maximum for monthly average

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

Chromium 0.72 0.29

Cyanide 0.39 0.16

Zinc 1.97 0.81

Aluminum 11.81 5.24

Oil and grease 19.33 19.33

Suspended solids 29.00 23.20

pH (1) (1)

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