Statutes, codes, and regulations
Wisconsin Administrative Code
Agency - Department of Natural ResourcesEnvironmental Protection - Wisconsin Pollutant Discharge Elimination SystemChapter 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

Wis. Admin. Code Department of Natural Resources NR 256.12

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Current through November 25, 2024
Section NR 256.12 - 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. 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.

Wis. Admin. Code Department of Natural Resources NR 256.12

Cr. Register, June, 1989, No. 402, eff. 7-1-89.