Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 257 - Aluminum forming › Subchapter III - The Extrusion Subcategory › Section NR 257.34 - New source performance standards

Current through June 24, 2024
Any new source subject to this subchapter shall achieve the
					 following performance standards. Degassing operations may not discharge
					 wastewater pollutants.
Table 83
Core operation NSPS
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.13
0.051
Cyanide
0.068
0.027
Zinc
0.35
0.14
Aluminum
2.07
0.92
Oil and grease
3.39
3.39
Suspended solids
5.10
4.07
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 84
Extrusion press leakage NSPS
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.11
0.045
Cyanide
0.060
0.024
Zinc
0.31
0.126
Aluminum
1.82
0.81
Oil and grease
2.98
2.98
Suspended solids
4.47
3.58
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 85
Direct chill casting contact cooling water
					 NSPS
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cast
								  by semicontinuous methods
Chromium
0.4
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.
Table 86
Press heat treatment contact cooling water
					 NSPS
Pollutant or pollutant property
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
					 at all times.
Table 87
Solution heat treatment contact cooling water
					 NSPS
Pollutant or pollutant property
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
					 at all times.
Table 88
Cleaning or etching bath NSPS
Pollutant or pollutant property
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
					 at all times.
Table 89
Cleaning or etching rinse and hot water seal
					 NSPS
Pollutant or pollutant property
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
					 at all times.
Table 90
Cleaning or etching scrubber liquor
					 NSPS
Pollutant or pollutant property
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
					 at all times.