Wis. Admin. Code Department of Natural Resources NR 256.42

Current through October 28, 2024

Section NR 256.42 - 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:

Table 71

ZINC CASTING SUBCATEGORY CASTING QUENCH OPERATIONS

BPT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for 1 day	any 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)	0.0344	0.0187	0.77	0.42	0.0076
Lead (T)	0.0353	0.0174	0.79	0.39	0.0098
Zinc (T)	0.0509	0.0192	1.14	0.43	0.0121
Oil & grease	1.34	0.446	30	10	0.223
TSS	1.7	0.67	38	15	0.446
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (5.35/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 at all times

Table 72

ZINC 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	0.328	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 at all times.

Table 73

ZINC 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)	1.56	0.852	0.77	0.42	0.345
Lead (T)	1.6	0.791	0.79	0.39	0.446
Zinc (T)	2.31	0.872	1.14	0.43	0.548
Total phenols	1.74	0.608	0.86	0.3	0.406
Oil & grease	60.8	20.3	30	10	10.1
TSS	77.1	30.4	38	15	20.3
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (0.243/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 74

ZINC 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)	0.304	0.166	0.77	0.42	0.067
Lead (T)	0.311	0.154	0.79	0.39	0.0867
Zinc (T)	0.449	0.17	1.14	0.43	0.106
Oil & grease	11.8	3.94	30	10	1.97
TSS	15	5.91	38	15	3.94
pH	(3)	(3)	(3)	(3)	(3)

(1) These concentrations shall be multiplied by the ratio of (47.3/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 at all times

Wis. Admin. Code Department of Natural Resources NR 256.42

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