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 Code of Federal Regulations (Last Updated: July 5, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter N - Effluent Guidelines and Standards
 Part 464 - Metal Molding and Casting Point Source Category
 Subpart A - Aluminum Casting Subcategory

  § 464.13 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.  

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  • § 464.13 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 Sm3 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/l) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to non-continuous dischargers.

    (a) Casting Cleaning 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) 0.0771 0.0421
    Lead (T) 0.0791 0.039
    Zinc (T) 0.114 0.0431
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.017
    Lead (T) 0.79 0.39 0.022
    Zinc (T) 1.14 0.43 0.027

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

    2These concentrations must be multiplied by the ratio of (12/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (b) 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) 0.0093 0.0051
    Lead (T) 0.0096 0.0047
    Zinc (T) 0.0138 0.0052
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.0021
    Lead (T) 0.79 0.39 0.0027
    Zinc (T) 1.14 0.43 0.0033

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

    2These concentrations must be multiplied by the ratio of (1.45/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (c) 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) 0.0068 0.0034
    Zinc (T) 0.0098 0.0037
    Total Phenols 0.0074 0.0026
    Maximum for any 1 day Maximum for monthly average Annual average1
    (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

    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.

    (d) Dust Collection 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) 0.231 0.126
    Lead (T) 0.237 0.117
    Zinc (T) 0.343 0.129
    Total Phenols 0.258 0.09
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.0511
    Lead (T) 0.79 0.39 0.0661
    Zinc (T) 1.14 0.43 0.0811
    Total Phenols 0.86 0.3 0.0601

    1 kg/62.3 million Sm3 (lb per billion SCF) of air scrubbed.

    2 These concentrations must be multiplied by the ratio of (0.036/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

    (e) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.

    (f) Investment Casting.

    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) 8.48 4.63
    Lead (T) 8.7 4.3
    Zinc (T) 12.6 4.74
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 1.87
    Lead (T) 0.79 0.39 2.42
    Zinc (T) 1.14 0.43 2.97

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

    2 These concentrations must be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (g) 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) 3.01 1.64
    Lead (T) 3.09 1.52
    Zinc (T) 4.45 1.68
    Total phenols 3.36 1.17
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.664
    Lead (T) 0.79 0.39 0.859
    Zinc (T) 1.14 0.43 1.05
    Total phenols 0.86 0.3 0.781

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

    2 These concentrations must be multiplied by the ratio of (0.468/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

    (h) 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) 0.297 0.162
    Lead (T) 0.305 0.151
    Zinc (T) 0.44 0.166
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.0656
    Lead (T) 0.79 0.39 0.0849
    Zinc (T) 1.14 0.43 0.104

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

    2 These concentrations must be multiplied by the ratio of (46.3/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    [50 FR 45247, Oct. 30, 1985; 51 FR 21760, June 16, 1986]