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
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
