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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 C - Ferrous Casting Subcategory

  § 464.32 - 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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  • § 464.32 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/1,000 kkg or lb/million lb of sand reclaimed; 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/l) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to non-continuous dischargers.

    (a) Casting Cleaning 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) 0.0129 0.0071
    Lead (T) 0.0353 0.0174
    Zinc (T) 0.0656 0.025
    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/l)2 (mg/l)2
    Copper (T) 0.29 0.16 0.0029
    Lead (T) 0.79 0.39 0.0098
    Zinc (T) 1.47 0.56 0.0179
    Oil and grease 30 10 0.223
    TSS 38 15 0.446
    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 (5.33/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) 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) 0.0138 0.0076
    Lead (T) 0.0376 0.0185
    Zinc (T) 0.0699 0.0266
    Oil and grease 1.43 0.476
    TSS 1.81 0.713
    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) 0.29 0.16 0.0031
    Lead (T) 0.79 0.39 0.0105
    Zinc (T) 1.47 0.56 0.019
    Oil and grease 30 10 0.238
    TSS 38 15 0.476
    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 (5.7/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) Dust Collection Scrubber Operations.

    BPT 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) 0.218 0.12
    Lead (T) 0.593 0.293
    Zinc (T) 1.1 0.421
    Total phenols 0.656 0.225
    Oil and grease 22.5 7.51
    TSS 28.5 11.3
    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 (mg/l)2
    Copper (T) 0.29 0.16 0.0488
    Lead (T) 0.79 0.39 0.165
    Zinc (T) 1.47 0.56 0.3
    Total phenols 0.86 0.3 0.15
    Oil and grease 30 10 3.76
    TSS 38 15 7.51
    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 (0.090/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) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.

    (e) Investment Casting.

    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) 3.19 1.76
    Lead (T) 8.7 4.3
    Zinc (T) 16.2 6.17
    Oil and grease 330 110
    TSS 419 165
    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) 0.29 0.16 0.716
    Lead (T) 0.79 0.39 2.42
    Zinc (T) 1.47 0.56 4.41
    Oil and grease 30 10 55.1
    TSS 38 15 110
    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 (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.

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

    (f) Melting Furnace Scrubber Operations.

    BPT 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) 1.02 0.561
    Lead (T) 2.77 1.37
    Zinc (T) 5.15 1.96
    Total phenols 3.01 1.05
    Oil and grease 105 35
    TSS 133 52.6
    pH (1) (1)

    1Within 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) 0.29 0.16 0.228
    Lead (T) 0.79 0.39 0.771
    Zinc (T) 1.47 0.56 1.4
    Total phenols 0.86 0.3 0.701
    Oil and grease 30 10 17.5
    TSS 38 15 35
    pH (3) (3) (3)

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

    2 These concentrations must be multiplied by the ratio of (0.42/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.

    (g) 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) 0.0428 0.0236
    Lead (T) 0.117 0.0576
    Zinc (T) 0.217 0.0827
    Oil and grease 4.43 1.48
    TSS 5.61 2.22
    pH (1) (1)

    1Within 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) 0.29 0.16 0.0096
    Lead (T) 0.79 0.39 0.0325
    Zinc (T) 1.47 0.56 0.0591
    Oil and grease 30 10 0.738
    TSS 38 15 1.48
    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 (17.7/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

    (h) Slag 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
    Cooper (T) 0.0527 0.0291
    Lead (T) 0.144 0.0709
    Zinc (T) 0.267 0.102
    Oil and grease 5.46 1.82
    TSS 6.91 2.73
    pH (1) (1)

    1 Within the range 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) 0.29 0.16 0.0118
    Lead (T) 0.79 0.39 0.04
    Zinc (T) 1.47 0.56 0.0728
    Oil and grease 30 10 0.909
    TSS 38 15 1.82
    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 (21.8/x) where x is the actual normalized process wasterwater 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.

    (i) Wet Sand Reclamation 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 sand reclaimed
    Cooper (T) 0.217 0.12
    Lead (T) 0.59 0.291
    Zinc (T) 1.1 0.418
    Total phenols 0.642 0.224
    Oil and grease 22.4 7.47
    TSS 28.4 11.2
    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
    Cooper (T) 0.29 0.16 0.0485
    Lead (T) 0.79 0.39 0.164
    Zinc (T) 1.47 0.56 0.299
    Total phenols 0.86 0.3 0.149
    Oil and grease 30 10 3.73
    TSS 38 15 7.47
    pH (3) (3) (3)

    1 kg/1,000 kkg (pounds per million pounds) of sand reclaimed.

    2 These concentrations must be multiplied by the ratio of (89.5/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of sand reclaimed) 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 21761, June 16, 1986]