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 257.35 - Pretreatment standards for existing sources

Current through June 24, 2024
Except as provided in ss.
					 NR
					 211.13 and
					 211.14, any existing source subject to
					 this subchapter which introduces pollutants into a POTW shall comply with ch.
					 NR 211 and achieve the following pretreatment standards for existing sources.
					 Degassing operations may not discharge wastewater pollutants.
Table 91
Core operation PSES
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.15
0.061
Cyanide
0.098
0.041
Zinc
0.49
0.21
TTO
0.23
Oil and grease (alternate monitoring
								  parameter)
18.0
8.8
Table 92
Extrusion press leakage PSES
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.65
0.27
Cyanide
0.43
0.18
Zinc
2.16
0.90
TTO
1.02
Oil and grease (alternate monitoring
								  parameter)
77.0
39.0
Table 93
Direct chill casting contact cooling water
					 PSES
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  cast
Chromium
0.59
0.24
Cyanide
0.39
0.16
Zinc
1.94
0.81
TTO
0.92
Oil and grease (alternate monitoring
								  parameter)
69.0
35.0
Table 94
Press heat treatment contact cooling water
					 PSES
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  quenched
Chromium
0.90
0.37
Cyanide
0.59
0.25
Zinc
2.98
1.25
TTO
1.41
Oil and grease (alternate monitoring
								  parameter)
110.0
53.0
Table 95
Solution heat treatment contact cooling water
					 PSES
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  quenched
Chromium
0.90
0.37
Cyanide
0.59
0.25
Zinc
2.98
1.25
TTO
1.41
Oil and grease (alternate monitoring
								  parameter)
110.0
53.0
Table 96
Cleaning or etching bath PSES
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
0.079
0.032
Cyanide
0.052
0.022
Zinc
0.26
0.109
TTO
0.124
Oil and grease (alternate monitoring
								  parameter)
9.30
4.70
Table 97
Cleaning or etching rinse and hot water seal
					 PSES
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
1.7
0.7
Cyanide
1.2
0.5
Zinc
5.7
2.4
TTO
2.7
Oil and grease (alternate monitoring
								  parameter)
200.0
100.0
Table 98
Cleaning or etching scrubber liquor
					 PSES
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
0.85
0.35
Cyanide
0.56
0.23
Zinc
2.82
1.18
TTO
1.34
Oil and grease (alternate monitoring
								  parameter)
100.0
50.0