40 CFR 464.42: Effluent limitations guidelines 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 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available, except that non-continuous dischargers shall not be subject to the maximum day and maximum for monthly average mass (kg/1,000 kkg or lb/million lb of metal poured; kg/62.3 million Sm 3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, total phenols, oil and grease, and TSS. For non-continuous dischargers, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/1) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to noncontinuous dischargers.

(a) Casting Quench Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.0344 0.0187

Lead (T) 0.0353 0.0174

Zinc (T) 0.0509 0.0192

Oil and grease 1.34 0.446

TSS 1.7 0.67

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/1) 2 (mg/1) 2

Copper (T) 0.77 0.42 0.0076

Lead (T) 0.79 0.39 0.0098

Zinc (T) 1.14 0.43 0.0121

Oil and grease 30 10 0.223

TSS 38 15 0.446

pH (3) (3) (3)

1 kg/1000 kkg (pound per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (5.35/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

3 Within the range of 7.0 to 10.0 at all times.

(b) Die Casting Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.0066 0.0036

Lead (T) 0.0068 0.0034

Zinc (T) 0.0098 0.0037

Total phenols 0.0074 0.0026

Oil and grease 0.259 0.0864

TTS 0.328 0.13

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.0015

Lead (T) 0.79 0.39 0.0019

Zinc (T) 1.14 0.43 0.0023

Total phenols 0.86 0.3 0.0017

Oil and grease 30 10 0.0432

TSS 38 15 0.0864

pH (3) (3) (3)

1 kg/1000 kkg (pound per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (1.04/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

3 Within the range of 7.0 to 10.0 at all times.

(c) Melting Furnace Scrubber Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/62.3 millions Sm 3 (pounds per billion SCF) of air scrubbed

Copper (T) 1.56 0.852

Lead (T) 1.6 0.791

Zinc (T) 2.31 0.872

Total Phenols 1.74 0.608

Oil and grease 60.8 20.3

TSS 77.1 30.4

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.345

Lead (T) 0.79 0.39 0.446

Zinc (T) 1.14 0.43 0.548

Total Phenols 0.86 0.3 0.406

Oil and grease 30 10 10.1

TSS 38 15 20.3

pH (3) (3) (3)

1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed.

2 These concentrations must be multiplied by the ratio of (0.243/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed for a specific plant.

3 Within the range of 7.0 to 10.0 at all times.

(d) Mold Cooling Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.304 0.166

Lead (T) 0.311 0.154

Zinc (T) 0.449 0.17

Oil and grease 11.8 3.94

TSS 15 5.91

pH (1) (1)

1 Within the range of 7.0 to 10.0 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.067

Lead (T) 0.79 0.39 0.0867

Zinc (T) 1.14 0.43 0.106

Oil and grease 30 10 1.97

TSS 38 15 3.94

pH (3) (3) (3)

1 kg/1,000 kkg (pounds per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (47.3/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

3 Within the range of 7.0 to 10.0 at all times.