40 CFR 464.12 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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)	0.0771	0.0421	Lead (T)	0.0791	0.039	Zinc (T)	0.114	0.0431	Oil & grease	3.0	1.0	TSS	3.80	1.50	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)	0.77	0.42	0.017	Lead (T)	0.79	0.39	0.022	Zinc (T)	1.14	0.43	0.027	Oil & grease	30	10	0.501	TSS	38	15	1.0	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)	0.0093	0.0051	Lead (T)	0.0096	0.0047	Zinc (T)	0.0138	0.0052	Oil & grease	0.363	0.121	TSS	0.46	0.182	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)	0.77	0.42	0.0021	Lead (T)	0.79	0.39	0.0027	Zinc (T)	1.14	0.43	0.0033	Oil & grease	30	10	0.0605	TSS	38	15	0.121	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.

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 & Grease	0.259	0.0864	TSS	0.33	0.13	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)	0.77	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 & Grease	30	10	0.0432	TSS	38	15	0.0864	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)	0.231	0.126	Lead (T)	0.237	0.117	Zinc (T)	0.343	0.129	Total Phenols	0.258	0.09	Oil & Grease	9.01	3.0	TSS	11.4	4.51	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) 2	mg/l) 2		Copper (T)	0.77	0.42	0.0511	Lead (T)	0.79	0.39	0.0661	Zinc (T)	1.14	0.43	0.0811	Total Phenols	0.86	0.3	0.0601	Oil & Grease	30	10	1.5	TSS	38	15	3.0	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)	8.48	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)

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)	0.77	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)

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)	3.01	1.64	Lead (T)	3.09	1.52	Zinc (T)	4.45	1.68	Total phenols	3.36	1.17	Oil and grease	117	39.1	TSS	148	58.6	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)	0.77	0.42	0.664	Lead (T)	0.79	0.39	0.859	Zinc (T)	1.14	0.43	1.05	Total phenols	0.86	0.3	0.781	Oil and grease	30	10	19.5	TSS	38	15	39.1	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)	0.297	0.162	Lead (T)	0.305	0.151	Zinc (T)	0.44	0.166	Oil and grease	11.6	3.86	TSS	14.7	5.79	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)	0.77	0.42	0.0656	Lead (T)	0.79	0.39	0.0849	Zinc (T)	1.14	0.43	0.104	Oil and grease	30	10	1.93	TSS	38	15	3.86	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]