40 C.F.R. § 467.24

Current through September 30, 2024
Section 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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0480.020
Cyanide0.0260.011
Zinc0.1330.055
Aluminum0.800.35
Oil and grease1.301.30
Suspended solids1.951.56
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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cast by semicontinuous methods
Chromium0.490.20
Cyanide0.270.11
Zinc1.360.56
Aluminum8.123.60
Oil and grease13.2913.29
Suspended solids19.9415.95
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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium0.760.31
Cyanide0.410.17
Zinc2.080.86
Aluminum12.455.52
Oil and grease20.3720.37
Suspended solids30.5624.45
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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.0670.027
Cyanide0.0360.015
Zinc0.1830.075
Aluminum1.0940.485
Oil and grease1.791.79
Suspended solids2.692.15
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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.520.21
Cyanide0.280.11
Zinc1.420.59
Aluminum8.503.77
Oil and grease13.9113.91
Suspended solids20.8716.70
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 propertyNSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.720.29
Cyanide0.390.16
Zinc1.970.81
Aluminum11.815.24
Oil and grease19.3319.33
Suspended solids29.0023.20
pH(1)(1)

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

40 C.F.R. §467.24

48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988