Wis. Admin. Code Department of Natural Resources NR 256.22

Current through October 28, 2024

Section NR 256.22 - Effluent limitations 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 to 125.32, any existing point source subject to this subchapter, including noncontinuous direct dischargers, shall achieve the following BPT effluent limitations. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

TABLE 15

COPPER CASTING SUBCATEGORY

CASTING QUENCH OPERATIONS

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.0307	0.0168	0.77	0.42	0.0068
Lead (T)	0.0315	0.0156	0.79	0.39	0.0066
Zinc (T)	0.0455	0.0171	1.14	0.43	0.0108
Oil & grease	1.2	0.399	30	10	0.199
TSS	1.52	0.598	38	15	0.399
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(3) Within the range of 7.0 to 10.0 to all times.

TABLE 16

COPPER CASTING SUBCATEGORY

DIRECT CHILL CASTING OPERA TIONS

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.928	0.506	0.77	0.42	0.205
Lead (T)	0.952	0.47	0.79	0.39	0.265
Zinc (T)	1.37	0.518	1.14	0.43	0.326
Oil & grease	36.2	12.1	30	10	6.03
TSS	45.8	18.1	38	15	12.1
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(3) Within the range of 7.0 to 10.0 to all times.

TABLE 17

COPPER CASTING SUBCATEGORY

DUST COLLECTION SCRUBBER OPERATIONS

		BPT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/62.3 million Sm³ (pounds per billion SCF) of air scrubbed		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.553	0.301	0.77	0.42	0.122
Lead (T)	0.567	0.28	0.79	0.39	0.158
Zinc (T)	0.818	0.309	1.14	0.43	0.194
Total phenols	0.617	0.215	0.86	0.3	0.144
Oil & grease	21.5	7.18	30	10	3.59
TSS	27.3	10.8	38	15	7.18
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

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

TABLE 18

COPPER CASTING SUBCATEGORY

INVESTMENT CASTING

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	8.48	4.63	0.77	0.42	1.87
Lead (T)	8.7	4.3	0.79	0.39	2.42
Zinc (T)	12.6	4.74	1.14	0.43	2.97
Oil & grease	330	110	30	10	55.1
TSS	419	165	38	15	110
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(3) Within the range of 7.0 to 10.0 to all times.

TABLE 19

COPPER CASTING SUBCATEGORY

MELTING FURNACE SCRUBBER OPERATIONS

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/62.3 million Sm³ (pounds per billion SCF) of air scrubbed		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	1.81	0.988	0.77	0.42	0.4
Lead (T)	1.86	0.918	0.79	0.39	0.158
Zinc (T)	2.68	1.01	1.14	0.43	0.635
Total phenols	2.02	0.706	0.86	0.3	0.467
Oil & grease	70.6	23.5	30	10	11.8
TSS	89.4	35.3	38	15	23.5
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

(3) Within the range of 7.0 to 10.0 to all times.

TABLE 20

COPPER CASTING SUBCATEGORY

MOLD COOLING OPERATIONS

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.392	0.214	0.77	0.42	0.0865
Lead (T)	0.402	0.199	0.79	0.39	0.112
Zinc (T)	0.58	0.219	1.14	0.43	0.137
Oil & grease	15.3	5.09	30	10	2.54
TSS	19.3	7.63	38	15	5.09
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(3) Within the range of 7.0 to 10.0 to all times.

Wis. Admin. Code Department of Natural Resources NR 256.22

Cr. Register, June, 1989, No. 402, eff. 7-1-89.