Regulations last checked for updates: May 16, 2024

Title 40 - Protection of Environment last revised: May 14, 2024
All TitlesTitle 40Chapter IPart 464Subpart A - Subpart A—Aluminum Casting Subcategory
View all text of Subpart A [§ 464.10 - § 464.17]
§ 464.12 - 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 Sm 3 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 limitation and annual average mass limitation 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)0.07710.0421
Lead (T)0.07910.039
Zinc (T)0.1140.0431
Oil & grease3.01.0
TSS3.801.50
pH( 1)( 1)

1 Within the range of 7.0 to 10.00 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2(mg/l) 2
Copper (T)0.770.420.017
Lead (T)0.790.390.022
Zinc (T)1.140.430.027
Oil & grease30100.501
TSS38151.0
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 (12/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)0.00930.0051
Lead (T)0.00960.0047
Zinc (T)0.01380.0052
Oil & grease0.3630.121
TSS0.460.182
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 average 1
(mg/l) 2(mg/l) 2
Copper (T)0.770.420.0021
Lead (T)0.790.390.0027
Zinc (T)1.140.430.0033
Oil & grease30100.0605
TSS38150.121
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 (1.45/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) 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)0.00660.0036
Lead (T)0.00680.0034
Zinc (T)0.00980.0037
Total Phenols0.00740.0026
Oil & Grease0.2590.0864
TSS0.330.13
pH( 1)( 1)

1 With the range of 7.0 to 10.0 at all times.

Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) ( 2)(mg/l) ( 2)
Copper (T)0.770.420.0015
Lead (T)0.790.390.0019
Zinc (T)1.140.430.0023
Total Phenols0.860.30.0017
Oil & Grease30100.0432
TSS38150.0864
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 (1.04/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,

(d) Dust Collection Scrubber Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed
Copper (T)0.2310.126
Lead (T)0.2370.117
Zinc (T)0.3430.129
Total Phenols0.2580.09
Oil & Grease9.013.0
TSS11.44.51
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 average 1
(mg/l) 2mg/l) 2
Copper (T)0.770.420.0511
Lead (T)0.790.390.0661
Zinc (T)1.140.430.0811
Total Phenols0.860.30.0601
Oil & Grease30101.5
TSS38153.0
pH( 3)( 3)( 3)

1 kg/62.3 million SM 3 (pounds 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 waste-water 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.

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

(f) 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)8.484.63
Lead (T)8.74.3
Zinc (T)12.64.74
Oil and grease330110
TSS419165
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 average 1
(mg/l) 2(mg/l) 2
Copper (T)0.770.421.87
Lead (T)0.790.392.42
Zinc (T)1.140.432.97
Oil and grease301055.1
TSS3815110
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.

(g) Melting Furnace Scrubber Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed
Copper (T)3.011.64
Lead (T)3.091.52
Zinc (T)4.451.68
Total phenols3.361.17
Oil and grease11739.1
TSS14858.6
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 average 1
(mg/l) 2(mg/l) 2
Copper (T)0.770.420.664
Lead (T)0.790.390.859
Zinc (T)1.140.431.05
Total phenols0.860.30.781
Oil and grease301019.5
TSS381539.1
pH( 2)( 3)( 3)

1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed.

2 These concentrations must be multiplied by the ratio of (0.468/x) where x is the acutal 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.

(h) 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)0.2970.162
Lead (T)0.3050.151
Zinc (T)0.440.166
Oil and grease11.63.86
TSS14.75.79
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 average 1
(mg/l) 1(mg/) 1
Copper (T)0.770.420.0656
Lead (T)0.790.390.0849
Zinc (T)1.140.430.104
Oil and grease30101.93
TSS38153.86
pH( 3)( 3)( 3)

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

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.

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

[50 FR 45247, Oct. 30, 1985; 51 FR 21760, June 16, 1986]
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501 of the Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311,1314,c,e, 1316 (b) andc, 1317 (b) andc,1318,and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 50 FR 45247, Oct. 30, 1985, unless otherwise noted.
cite as: 40 CFR 464.12
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