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 I - Aluminum Casting Subcategory › Section NR 256.12 - 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 1
ALUMINUM 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)
0.0771
0.0421
0.77
0.42
0.017
Lead (T)
0.0791
0.039
0.79
0.39
0.022
Zinc (T)
0.114
0.0431
1.14
0.43
0.027
Oil & grease
3.0
1.0
30
10
0.501
TSS
3.8
1.5
38
15
1.0
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (12/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 2
ALUMINUM 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)
0.0093
0.0051
0.77
0.42
0.0021
Lead (T)
0.0096
0.0047
0.79
0.39
0.0027
Zinc (T)
0.0138
0.0052
1.14
0.43
0.0033
Oil & grease
0.363
0.121
30
10
0.0605
TSS
0.46
0.182
38
15
0.121
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (1.45/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 3
ALUMINUM CASTING SUBCATEGORY
DIE CASTING 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)
0.0066
0.0036
0.77
0.42
0.0015
Lead (T)
0.0068
0.0034
0.79
0.39
0.0019
Zinc (T)
0.0098
0.0037
1.14
0.43
0.0023
Total phenols
0.0074
0.0026
0.86
0.3
0.0017
Oil & grease
0.259
0.0864
30
10
0.0432
TSS
0.33
0.13
38
15
0.0864
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (1.04/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 4
ALUMINUM 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)
0.231
0.126
0.77
0.42
0.0511
Lead (T)
0.237
0.117
0.79
0.39
0.0661
Zinc (T)
0.343
0.129
1.14
0.43
0.0811
Total phenols
0.258
0.09
0.86
0.3
0.0601
Oil & grease
9.01
3.0
30
10
1.5
TSS
11.4
4.51
38
15
3.0
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (0.036/x) where x is the
				  actual normalized process wastewater discharge flow (in gallons per 1,000 SCF
				  of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3 (pounds per billion
				  SCF) of air scrubbed.
(3) Within
				  the range of 7.0 to 10.0 to all times.
TABLE 5
ALUMINUM 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)
8.48
4.63
0.77
0.42
1.87
Lead (T)
8.7
4.3
0.79
0.39
2.42
Zinc (T)
12.6
4.74
1.14
0.43
2.97
Oil & grease
330
110
30
10
55.1
TSS
419
165
38
15
110
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 to all times.
TABLE 6
ALUMINUM CASTING SUBCATEGORY
MELTING FURNACE 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)
3.01
1.64
0.77
0.42
0.664
Lead (T)
3.09
1.52
0.79
0.39
0.859
Zinc (T)
4.45
1.68
1.14
0.43
1.05
Total phenols
3.36
1.17
0.86
0.3
0.781
Oil & grease
117
39.1
30
10
19.5
TSS
148
58.6
38
15
39.1
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (0.468/x) where x is the
				  actual normalized process wastewater discharge flow (in gallons per 1,000 SCF
				  of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3
					 (pounds per billion SCF) of air scrubbed.
(3) Within the range of 7.0 to 10.0 to all
				  times.
TABLE 7
ALUMINUM CASTING SUBCATEGORY
MOLD COOLING 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)
0.297
0.162
0.77
0.42
0.0656
Lead (T)
0.305
0.151
0.79
0.39
0.0849
Zinc (T)
0.44
0.166
1.14
0.43
0.104
Oil & grease
11.6
3.86
30
10
1.93
TSS
14.7
5.79
38
15
3.86
pH
(3)
(3)
(3)
(3)
(3)
(1) These
				  concentrations shall be multiplied by the ratio of (46.3/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.