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

(a) Casting Quench Operations.

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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) 0.0307 0.0168
Lead (T) 0.0315 0.0156
Zinc (T) 0.0455 0.0171
Oil and grease 1.2 0.399
TSS 1.52 0.598
pH (1) (1)
Expand Table
Maximum for any 1 day Maximum for monthly average Annual average1
(mg/l)2 (mg/l)2
Copper (T) 0.77 0.42 0.0068
Lead (T) 0.79 0.39 0.0088
Zinc (T) 1.14 0.43 0.0108
Oil and grease 30 10 0.199
TSS 38 15 0.399
pH (3) (3) (3)

(b) Direct Chill Casting Operations.

Expand Table

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) 0.928 0.506
Lead (T) 0.952 0.47
Zinc (T) 1.37 0.518
Oil and grease 36.2 12.1
TSS 45.8 18.1
pH (1) (1)
Expand Table
Maximum for any 1 day Maximum for monthly average Annual average1
(mg/l)2 (mg/l)2
Copper (T) 0.77 0.42 0.205
Lead (T) 0.79 0.39 0.265
Zinc (T) 1.14 0.43 0.326
Oil and grease 30 10 6.03
TSS 38 15 12.1
pH (3) (3) (3)

(c) Dust Collection Scrubber Operations.

Expand Table

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) 0.553 0.301
Lead (T) 0.567 0.28
Zinc (T) 0.818 0.309
Total phenols 0.617 0.215
Oil and grease 21.5 7.18
TSS 27.3 10.8
ph (1) (1)
Expand Table
Maximum for any 1 day Maximum for monthly average Annual average1
(mg/l)2 (mg/l)2
Copper (T) 0.77 0.42 0.122
Lead (T) 0.79 0.39 0.158
Zinc (T) 1.14 0.43 0.194
Total phenols 0.86 0.3 0.144
Oil and grease 30 10 3.59
TSS 38 15 7.18
pH (3) (3) (3)

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

(e) Investment Casting.

Expand Table

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) 8.48 4.63
Lead (T) 8.7 4.3
Zinc (T) 12.6 4.74
Oil and grease 330 110
TSS 419 165
pH (1) (1)
Expand Table
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
Oil and grease 30 10 55.1
TSS 38 15 110
pH (3) (3) (3)

(f) Melting Furnace Scrubber Operations.

Expand Table

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) 1.81 0.988
Lead (T) 1.86 0.918
Zinc (T) 2.68 1.01
Total phenols 2.02 0.706
Oil and grease 70.6 23.5
TSS 89.4 35.3
pH (1) (1)
Expand Table
Maximum for any 1 day Maximum for monthly average Annual average1
(mg/l)2 (mg/l)2
Copper (T) 0.77 0.42 0.4
Lead (T) 0.79 0.39 0.518
Zinc (T) 1.14 0.43 0.635
Total phenols 0.86 0.3 0.467
Oil and grease 30 10 11.8
TSS 38 15 23.5
pH (3) (3) (3)

(g) Mold Cooling Operations.

Expand Table

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) 0.392 0.214
Lead (T) 0.402 0.199
Zinc (T) 0.58 0.219
Oil and grease 15.3 5.09
TSS 19.3 7.63
pH (1) (1)
Expand Table
Maximum for any 1 day Maximum for monthly average Annual average1
(mg/l)2 (mg/l)2
Copper (T) 0.77 0.42 0.0865
Lead (T) 0.79 0.39 0.112
Zinc (T) 1.14 0.43 0.137
Oil and grease 30 10 2.54
TSS 38 15 5.09
pH (3) (3) (3)

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


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