Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 273 - Nonferrous metals forming and metal powders › Subchapter II - Magnesium › Section NR 273.024 - New source performance standards

Current through June 24, 2024
Any new source subject to this subchapter shall achieve the
					 following standards:
Table 2-17
Magnesium
Rolling Spent Emulsions
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium rolled with emulsions
Chromium
0.028
0.011
Zinc
0.076
0.032
Ammonia
9.95
4.37
Fluoride
4.44
1.97
Oil and grease
0.746
0.746
Total suspended solids
1.12
0.895
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-18
Magnesium
Forging Contact Cooling Water
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  forged magnesium cooled with water
Chromium
0.107
0.044
Zinc
0.295
0.122
Ammonia
38.5
17.0
Fluoride
17.2
7.63
Oil and grease
2.89
2.89
Total suspended solids
4.34
3.47
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-19
Magnesium
Forging Equipment Cleaning Wastewater
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  forged magnesium
Chromium
0.002
0.0006
Zinc
0.004
0.002
Ammonia
0.532
0.234
Fluoride
0.238
0.106
Oil and grease
0.040
0.040
Total suspended solids
0.060
0.048
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-20
Magnesium
Direct Chill Casting Contact Cooling Water
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium cast with direct chill methods
Chromium
1.46
0.593
Zinc
4.03
1.66
Ammonia
527
232
Fluoride
235
105
Oil and grease
39.5
39.5
Total suspended solids
59.3
47.4
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-21
Magnesium
Surface Treatment Spent Baths
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium surface treated
Chromium
0.173
0.070
Zinc
0.476
0.196
Ammonia
62.1
27.3
Fluoride
27.8
12.3
Oil and grease
4.66
4.66
Total suspended solids
6.99
5.6
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-22
Magnesium
Surface Treatment Rinse
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium surface treated
Chromium
0.700
0.284
Zinc
1.93
0.794
Ammonia
252
111
Fluoride
113
49
Oil and grease
18.9
18.9
Total suspended solids
28.4
22.7
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-23
Magnesium
Sawing or Grinding Spent Emulsions
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium sawed or ground
Chromium
0.007
0.003
Zinc
0.020
0.008
Ammonia
2.60
1.15
Fluoride
1.16
0.515
Oil and grease
0.195
0.195
Total suspended solids
0.293
0.234
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 2-24
Magnesium
Wet Air Pollution Control Scrubber Blowdown
NSPS
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  magnesium sanded and repaired or forged
Chromium
0.229
0.093
Zinc
0.632
0.260
Ammonia
82.5
36.3
Fluoride
36.9
16.4
Oil and grease
6.19
6.19
Total suspended solids
9.29
7.43
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all
					 times