Regulations last checked for updates: Nov 25, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024
All TitlesTitle 40Chapter IPart 467Subpart C - Subpart C—Extrusion Subcategory
View all text of Subpart C [§ 467.30 - § 467.37]
§ 467.34 - New source performance standards.

Any new source subject to this subpart must achieve the following performance standards.

(a) There shall be no discharge allowance for wastewater pollutants from the degassing operation.

(b) The discharge of wastewater pollutants from the core and ancillary operations except those listed in paragraph (a) shall not exceed the values set forth below:

Subpart C Core
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum extruded
Chromium0.130.051
Cyanide0.0680.027
Zinc0.350.14
Aluminum2.070.92
Oil and grease3.393.39
Suspended solids5.104.07
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 NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum extruded
Chromium0.110.045
Cyanide0.0600.024
Zinc0.310.126
Aluminum1.820.81
Oil and grease2.982.98
Suspended solids4.473.58
pH( 1)( 1)

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

Subpart C 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
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 C Press 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
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 C 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
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 C 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
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 C 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
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 C 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
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.

[48 FR 49149, Oct. 24, 1983; 49 FR 11633, 11634, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]
authority: Secs. 301, 304(b), (c), (e), and (g), 306(b) and (c), 307(b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316(b) andc, 1317(b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 48 FR 49149, Oct. 24, 1983, unless otherwise noted.
cite as: 40 CFR 467.34
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