Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 256 - Metal molding and casting › Subchapter III - Ferrous Casting Subcategory › Section NR 256.32 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available

Current through June 24, 2024
Except as provided in
					 40 CFR 125.30
					 to
					 125.32, any
					 existing point source subject to this subchapter, including noncontinuous
					 direct dischargers, shall achieve the following BPT effluent limitations.
					 Grinding scrubber operations may not discharge process wastewater pollutants to
					 waters of the state.
TABLE 39
FERROUS CASTING SUBCATEGORY
CASTING CLEANING OPERATIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for any 1 day
Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of metal
								  poured
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.0129
0.0071
0.29
0.16
0.0029
Lead (T)
0.0353
0.0174
0.79
0.39
0.0098
Zinc (T)
0.0656
0.025
1.47
0.56
0.0179
Oil & grease
1.34
0.446
30
10
0.223
TSS
1.7
0.67
38
15
0.446
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (5.33/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal
					 poured.
(3) Within the range of 7.0 to 10.0 to all times.
TABLE 40
FERROUS CASTING SUBCATEGORY
CASTING QUENCH OPERATIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for any 1 day
Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of metal
								  poured
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.0138
0.0076
0.29
0.16
0.0031
Lead (T)
0.0376
0.0185
0.79
0.39
0.0105
Zinc (T)
0.0699
0.0266
1.47
0.56
0.019
Oil & grease
1.43
0.476
30
10
0.238
TSS
1.81
0.713
38
15
0.476
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (5.7/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal
					 poured.
(3) Within the range of 7.0 to 10.0 to all times.
TABLE 41
FERROUS CASTING SUBCATEGORY
DUST COLLECTION SCRUBBER OPERATIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for any 1 day
Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/62.3 million Sm3
								  (pounds per billion SCF) of air scrubbed
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.218
0.12
0.29
0.16
0.0488
Lead (T)
0.593
0.293
0.79
0.39
0.165
Zinc (T)
1.1
0.421
1.47
0.56
0.3
Total phenols
0.656
0.225
0.86
0.3
0.15
Oil & grease
22.5
7.51
30
10
3.76
TSS
28.5
11.3
38
15
7.51
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (1,320/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal
					 poured.
(3) Within the range of 7.0 to 10.0 at all times.
TABLE 42
FERROUS CASTING SUBCATEGORY
INVESTMENT CASTING
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for any 1 day
Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of metal
								  poured
mg/l(1)
mg/l(1)
(2)
Copper (T)
3.19
1.76
0.29
0.16
0.716
Lead (T)
8.7
4.3
0.79
0.39
2.42
Zinc (T)
16.2
6.17
1.47
0.56
4.41
Oil & grease
330
110
30
10
55.1
TSS
419
165
38
15
110
pH
(3)
(3)
(3)
(3)
(3)
(1) In a multiple ferrous melting furnace scrubber
					 configuration, each discrete wet scrubbing device with an associated wastewater
					 discharge shall be given the mass allowance specified. The allowance will be
					 identical for each device and based on the airflow of the exhaust gas stream
					 that passes through the multiple scrubber configuration.
(2) These concentrations shall be multiplied by the ratio
					 of (0.42/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(3) kg/62.3 million Sm3 (pounds per billion SCF) of air
					 scrubbed.
(4) Within the range of 7.0 to 10.0 at all times.
TABLE 43
FERROUS CASTING SUBCATEGORY
MELTING FURNACE SCRUBBER OPERATIONS 
					 (1)
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for 1 day
any Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/62.3 million Sm3
								  (pounds per billion SCF) of air scrubbed
mg/l(1)
mg/l(1)
(2)
Copper (T)
1.02
0.561
0.29
0.16
0.228
Lead (T)
2.77
1.37
0.79
0.39
0.771
Zinc (T)
5.15
1.96
1.47
0.56
1.4
Total phenols
3.01
1.05
0.86
0.3
0.701
Oil & grease
105
35
30
10
17.5
TSS
133
52.6
38
15
35
pH
(4)
(4)
(4)
(4)
(4)
(1) In a multiple ferrous melting furnace scrubber
					 configuration, each discrete wet scrubbing device with an associated wastewater
					 dischar ge shall be given the mass allowance specified. The allowance will be
					 identical for each device and based on the airflow of the exhaust gas stream
					 that passes through the multiple scrubber configuration.
(2) These concentrations shall be multiplied by the ratio
					 of (0.42/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(3) kg/62.3 million Sm 3 (pounds per billion SCF) of air
					 scrubbed.
(4) Within the range of 7.0 to 10.0 at all times.
TABLE 44
FERROUS CASTING SUBCATEGORY
MOLD COOLING OPERATIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for 1 day
any Maximum for
monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of metal
								  poured
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.0428
0.0236
0.29
0.16
0.0096
Lead (T)
0.117
0.0576
0.79
0.39
0.0325
Zinc (T)
0.217
0.0827
1.47
0.56
0.0591
Oil & grease
4.43
1.48
30
10
0.738
TSS
5.61
2.22
38
15
1.48
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (17.7/x) where x is the actual normalized process wastewater dischar ge flow
					 (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal
					 poured.
(3) Within the range of 7.0 to 10.0 at all times.
TABLE 45
FERROUS CASTING SUBCATEGORY
SLAG QUENCH OPERA TIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for any 1 day
Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of metal
								  poured
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.0527
0.0291
0.29
0.16
0.0118
Lead (T)
0.144
0.0709
0.79
0.39
0.04
Zinc (T)
0.267
0.102
1.47
0.56
0.0728
Oil & grease
5.46
1.82
30
10
0.909
TSS
6.91
2.73
38
15
1.82
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (21.8/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal
					 poured.
(3) Within the range of 7.0 to 10.0 at all times.
TABLE 46
FERROUS CASTING SUBCATEGORY
WET SAND RECLAMATION OPERATIONS
BPT Effluent Limitations
Noncontinuous Direct Dischargers
Maximum for any 1 day
Maximum for monthly average
Maximum for 1 day
any Maximum for monthly average
Annual average
Pollutant or pollutant property
kg/1,000 kkg (pounds per million pounds) of sand
								  reclaimed
mg/l(1)
mg/l(1)
(2)
Copper (T)
0.217
0.12
0.29
0.16
0.0485
Lead (T)
0.59
0.291
0.79
0.39
0.164
Zinc (T)
1.1
0.418
1.47
0.56
0.299
Total phenols
0.642
0.224
0.86
0.3
0.149
Oil & grease
22.4
7.47
30
10
3.73
TSS
28.4
11.2
38
15
7.47
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (89.5/x) where x is the actual normalized process wastewater discharge flow
					 (in gallons per 1,000 pounds of sand reclaimed) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of sand
					 reclaimed.
(3) Within the range of 7.0 to 10.0 at all
					 times.