Wis. Admin. Code Department of Natural Resources NR 256.12

Current through October 28, 2024

Section NR 256.12 - 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 1

ALUMINUM CASTING SUBCATEGORY

CASTING CLEANING 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)	0.0771	0.0421	0.77	0.42	0.017
Lead (T)	0.0791	0.039	0.79	0.39	0.022
Zinc (T)	0.114	0.0431	1.14	0.43	0.027
Oil & grease	3.0	1.0	30	10	0.501
TSS	3.8	1.5	38	15	1.0
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (12/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 2

ALUMINUM 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)	0.0093	0.0051	0.77	0.42	0.0021
Lead (T)	0.0096	0.0047	0.79	0.39	0.0027
Zinc (T)	0.0138	0.0052	1.14	0.43	0.0033
Oil & grease	0.363	0.121	30	10	0.0605
TSS	0.46	0.182	38	15	0.121
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (1.45/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 3

ALUMINUM CASTING SUBCATEGORY

DIE CASTING 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)	0.0066	0.0036	0.77	0.42	0.0015
Lead (T)	0.0068	0.0034	0.79	0.39	0.0019
Zinc (T)	0.0098	0.0037	1.14	0.43	0.0023
Total phenols	0.0074	0.0026	0.86	0.3	0.0017
Oil & grease	0.259	0.0864	30	10	0.0432
TSS	0.33	0.13	38	15	0.0864
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (1.04/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 4

ALUMINUM 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)	0.231	0.126	0.77	0.42	0.0511
Lead (T)	0.237	0.117	0.79	0.39	0.0661
Zinc (T)	0.343	0.129	1.14	0.43	0.0811
Total phenols	0.258	0.09	0.86	0.3	0.0601
Oil & grease	9.01	3.0	30	10	1.5
TSS	11.4	4.51	38	15	3.0
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (0.036/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 5

ALUMINUM CASTING SUBCATEGORY

INVESTMENT CASTING

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)	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 6

ALUMINUM 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)	3.01	1.64	0.77	0.42	0.664
Lead (T)	3.09	1.52	0.79	0.39	0.859
Zinc (T)	4.45	1.68	1.14	0.43	1.05
Total phenols	3.36	1.17	0.86	0.3	0.781
Oil & grease	117	39.1	30	10	19.5
TSS	148	58.6	38	15	39.1
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (0.468/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 7

ALUMINUM 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)	0.297	0.162	0.77	0.42	0.0656
Lead (T)	0.305	0.151	0.79	0.39	0.0849
Zinc (T)	0.44	0.166	1.14	0.43	0.104
Oil & grease	11.6	3.86	30	10	1.93
TSS	14.7	5.79	38	15	3.86
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (46.3/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 256.12

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