Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024
All TitlesTitle 40Chapter IPart 467Subpart C - Subpart C—Extrusion Subcategory
View all text of Subpart C [§ 467.30 - § 467.37]
§ 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
Chromium0.160.066
Cyanide0.110.044
Zinc0.530.22
Aluminum2.341.16
Oil and grease7.324.39
Suspended solids15.07.13
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
Chromium0.650.27
Cyanide0.430.18
Zinc2.160.90
Aluminum9.514.73
Oil and grease29.5617.74
Suspended solids60.6028.82
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
Chromium0.590.24
Cyanide0.390.16
Zinc1.940.81
Aluminum8.554.26
Oil and grease26.5815.95
Suspended solids54.4925.92
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
Chromium3.391.39
Cyanide2.240.93
Zinc11.254.70
Aluminum49.5524.66
Oil and grease154.1092.46
Suspended solids315.91150.25
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
Chromium3.391.39
Cyanide2.240.93
Zinc11.254.70
Aluminum49.5524.66
Oil and grease154.1092.46
Suspended solids315.91150.25
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
Chromium0.0790.032
Cyanide0.0520.022
Zinc0.260.109
Aluminum1.150.573
Oil and grease3.582.15
Suspended solids7.343.49
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
Chromium6.122.51
Cyanide4.041.67
Zinc20.318.49
Aluminum89.4644.52
Oil and grease278.24166.95
Suspended solids570.39271.29
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
Chromium7.002.86
Cyanide4.611.91
Zinc23.229.70
Aluminum102.2450.88
Oil and grease318.00190.80
Suspended solids651.90310.05
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
Chromium1.150.47
Cyanide0.760.32
Zinc3.811.59
Aluminum16.788.35
Oil and grease52.1831.31
Suspended solids106.9750.88
pH( 1)( 1)

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

[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, 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 467.32
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