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

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Effluent Guidelines and Standards
  6. Metal Molding and Casting Point Source Category
  7. Zinc Casting Subcategory
  8. 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]


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