Wisconsin Legislature: Ch. NR 256 TOC

Chapter NR 256

METAL MOLDING AND CASTING

NR 256.01 Purpose.

NR 256.02 Applicability.

NR 256.03 General definitions.

NR 256.04 Monitoring and reporting requirements.

NR 256.05 Compliance dates.

Subchapter I — Aluminum Casting Subcategory

NR 256.10 Applicability; description of the aluminum casting subcategory.

NR 256.12 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

NR 256.13 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 256.14 New source performance standards.

NR 256.15 Pretreatment standards for existing sources.

NR 256.16 Pretreatment standards for new sources.

Subchapter II — Copper Casting Subcategory

NR 256.20 Applicability; description of the copper casting subcategory.

NR 256.22 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

NR 256.23 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 256.24 New source performance standards.

NR 256.25 Pretreatment standards for existing sources.

NR 256.26 Pretreatment standards for new sources.

Subchapter III — Ferrous Casting Subcategory

NR 256.30 Applicability; description of the ferrous casting subcategory.

NR 256.31 Specialized definitions.

NR 256.32 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

NR 256.33 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 256.34 New source performance standards.

NR 256.35 Pretreatment standard for existing sources.

NR 256.36 Pretreatment standards for new sources.

Subchapter IV — Zinc Casting Subcategory

NR 256.40 Applicability; description of the zinc casting subcategory.

NR 256.42 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

NR 256.43 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 256.44 New source performance standards.

NR 256.45 Pretreatment standards for existing sources.

NR 256.46 Pretreatment standards for new sources.

NR 256.01 NR 256.01 Purpose. The purpose of this chapter is to establish effluent limitations, standards of performance, and pretreatment standards for discharges of process wastes from the metal molding and casting category of point sources and its subcategories.

NR 256.01 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.02 NR 256.02 Applicability. This chapter applies to aluminum, copper, ferrous or zinc casting operations which discharge or may discharge pollutants to waters of the state or into a publicly owned treatment works.

NR 256.02 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.03 NR 256.03 General definitions. The following definitions are applicable to terms used in this chapter. Definitions of other terms and the meanings of other abbreviations are set forth in ss. NR 205.03, 205.04 and 211.03.

NR 256.03(1) (1) “Aluminum casting” means the remelting of aluminum or an aluminum alloy to form an intermediate or final cast product by pouring or forcing the molten metal into a mold.

NR 256.03(2) (2) “Copper casting” means the remelting of copper or a copper alloy, to form an intermediate or final cast product by pouring or forcing the molten metal into a mold.

NR 256.03(3) (3) “Existing source” means any point source, except a new source as defined in sub. (5), from which pollutants may be discharged either into waters of the state or into a POTW.

NR 256.03(4) (4) “Ferrous casting” means the remelting of ferrous metals to form an intermediate or final cast product by pouring or forcing the molten metal into a mold.

NR 256.03(5) (5) “New source”, as defined for new source performance standards and pretreatment standards for new sources, means any point source from which pollutants are or may be discharged directly into the waters of the state or into a POTW, the construction of which commenced after November 15, 1982.

NR 256.03(6) (6) “Noncontinuous discharger” means a plant which does not discharge pollutants during periods of at least 24 hours in duration for reasons other than an upset, such as plants which routinely store wastewater for treatment on a batch basis.

NR 256.03(7) (7) “Total phenols” means total phenolic compounds as measured by the test procedure for phenols, which is distillation followed by manual or automated colorimetric (4AAP), as indicated in ch. NR 219, Table B, for parameter 48.

NR 256.03(8) (8) “Zinc casting” means the remelting of zinc or a zinc alloy to form an intermediate or final cast product by pouring or forcing the molten metal into a mold.

NR 256.03(9) (9) Abbreviations to be used:

NR 256.03(9)(a) (a) “SCF” means standard cubic feet.

NR 256.03(9)(b) (b) “Sm 3” means standard cubic meters.

NR 256.03(9)(c) (c) “TTO” and “total toxic organics” mean the sum of the mass of each of the toxic organic compounds specified in the tables within this chapter which are found at a concentration greater than 0.010 mg/l.

NR 256.03 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.04 NR 256.04 Monitoring and reporting requirements.

NR 256.04(1)(1) Total toxic organics. An indirect discharger may elect to monitor for oil and grease as an alternate to TTO under PSES and PSNS regulatory values. Due to the high solubility of toxic organics in oil and grease, compliance with the oil and grease standard is considered equivalent to compliance with the TTO standard.

NR 256.04(2) (2) Noncontinuous dischargers.

NR 256.04(2)(a)(a) For noncontinuous direct dischargers, the department shall apply effluent limitations or standards in the form of mass-based annual average, concentration-based maximum day and concentration-based maximum monthly average as indicated in the tables within this chapter.

NR 256.04(2)(b) (b) For noncontinuous indirect dischargers, the control authority may elect to establish concentration-based standards as outlined in sub. (3).

NR 256.04(3) (3) Conversion to concentration-based units.

NR 256.04(3)(a)(a) The control authority may apply concentration-based standards which are exactly equivalent to PSNS and PSES mass-based standards. Concentration-based standards shall be derived by the following procedure:

NR 256.04(3)(b) (b) Multiply PSNS or PSES mass-based standards by a) average production (kkg of metal poured), b) raw material usage (kkg of sand reclaimed), or c) air scrubber flow (Sm3 of air scrubbed), whichever applies, and divide by average discharge flow to the POTW. In calculating, use appropriate measurements and conversion factors to ensure that concentration-based units in mg/l result.

NR 256.04(4) (4) Monthly discharge limit. Compliance with the monthly discharge limits, as calculated from monthly average regulatory values from tables contained in this chapter, is required regardless of the number of samples analyzed and averaged.

NR 256.04 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.05 NR 256.05 Compliance dates.

NR 256.05(1)(1) Any existing source subject to this chapter which discharges to waters of the state shall achieve:

NR 256.05(1)(a) (a) The effluent limitations representing BPT by July 1, 1977; and

NR 256.05(1)(b) (b) The effluent limitations representing BAT by July 1, 1984.

NR 256.05(2) (2) Any new source subject to this chapter which discharges to waters of the state shall achieve NSPS at the commencement of discharge.

NR 256.05(3) (3) Any existing source subject to this chapter which introduces process wastewater pollutants into a POTW shall achieve PSES by October 31, 1988.

NR 256.05(4) (4) Any new source subject to this chapter which introduces process wastewater pollutants into a POTW shall achieve PSNS at the commencement of discharge.

NR 256.05 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

subch. I of ch. NR 256 Subchapter I — Aluminum Casting Subcategory

NR 256.10 NR 256.10 Applicability; description of the aluminum casting subcategory.

NR 256.10(1) (1) This subchapter applies to discharges to waters of the state and to introductions of pollutants into publicly owned treatment works from aluminum casting operations. It applies to a production process if the molten metal contains, on average, greater than 50% by weight of aluminum or if aluminum comprises the greatest percentage of the metal, measured by weight.

NR 256.10(2) (2) This subchapter does not apply to the casting of ingots, pigs or other cast shapes following primary metal smelting, which is regulated by the nonferrous metals manufacturing point source category under 40 CFR Part 421. This subchapter does not apply to the casting of aluminum performed as an integral part of aluminum forming and conducted on-site at an aluminum forming plant, which is regulated by the aluminum forming point source category under 40 CFR Part 467.

NR 256.10(3) (3) Processing operations following the cooling of castings, except for grinding scrubber operations, may be regulated by the aluminum forming point source category under 40 CFR Part 467, electroplating point source category under ch. NR 260, or metal finishing point source category under ch. NR 261.

NR 256.10 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.12 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. - See PDF for table

NR 256.12 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.13 NR 256.13 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. 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 copper, lead, zinc, and total phenols effluent limitations contained in s. NR 256.12. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.13 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.14 NR 256.14 New source performance standards. Any new source subject to this subchapter, including noncontinuous direct dischargers, shall achieve the effluent limitations contained in s. NR 256.12. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.