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 IV - Zinc Casting Subcategory › Section NR 256.42 - 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:
Table 71
ZINC CASTING SUBCATEGORY CASTING QUENCH 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)
0.0344
0.0187
0.77
0.42
0.0076
Lead (T)
0.0353
0.0174
0.79
0.39
0.0098
Zinc (T)
0.0509
0.0192
1.14
0.43
0.0121
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 (5.35/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 72
ZINC 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
0.328
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 at all times.
Table 73
ZINC 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)
1.56
0.852
0.77
0.42
0.345
Lead (T)
1.6
0.791
0.79
0.39
0.446
Zinc (T)
2.31
0.872
1.14
0.43
0.548
Total phenols
1.74
0.608
0.86
0.3
0.406
Oil & grease
60.8
20.3
30
10
10.1
TSS
77.1
30.4
38
15
20.3
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (0.243/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 at all times
Table 74
ZINC 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)
0.304
0.166
0.77
0.42
0.067
Lead (T)
0.311
0.154
0.79
0.39
0.0867
Zinc (T)
0.449
0.17
1.14
0.43
0.106
Oil & grease
11.8
3.94
30
10
1.97
TSS
15
5.91
38
15
3.94
pH
(3)
(3)
(3)
(3)
(3)
(1) These concentrations shall be multiplied by the ratio
					 of (47.3/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 at all
					 times