40 CFR 464.43: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

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 available technology economically achievable, 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, and total phenols. 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 non-continuous dischargers.

(a) Casting Quench Operations.

BAT 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) 0.0237 0.0116

Zinc (T) 0.0339 0.0129

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

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

Copper (T) 0.77 0.42 0.0076

Lead (T) 0.53 0.26 0.0067

Zinc (T) 0.76 0.29 0.008

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

2 These concentrations must be multiplied by the ratio of (5.34/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

(b) Die Casting Operations.

BAT 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) 0.0046 0.0022

Zinc (T) 0.0066 0.0025

Total phenols 0.0074 0.0026

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) 0.53 0.26 0.0013

Zinc (T) 0.76 0.29 0.0016

Total phenols 0.86 0.3 0.0017

1 kg/1,000 kkg (pounds 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.

(c) Melting Furnace Scrubber Operations.

BAT Effluent Limitations

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

kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed

Copper (T) 1.56 0.852

Lead (T) 1.07 0.527

Zinc (T) 1.54 0.588

Total phenolse 1.74 0.608

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) 0.53 0.26 0.304

Zinc (T) 0.76 0.29 0.365

Total phenols 0.86 0.3 0.406

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 pounds of metal poured) for a specific plant.

(d) Mold Cooling Operations.

BAT 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) 0.209 0.103

Zinc (T) 0.3 0.114

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) 0.53 0.26 0.0591

Zinc (T) 0.76 0.29 0.071

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.