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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 D - Zinc Casting Subcategory

  § 464.42 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.  

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  • § 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 Sm3 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 average1
    (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 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
    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 Sm3 (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 average1
    (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 Sm3 (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 average1
    (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.

    [50 FR 45247, Oct. 30, 1985; 51 FR 21762, June 16, 1986]