Register October 2024 No. 826
Chapter NR 270
ORE MINING AND DRESSING
NR 270.0015 Applicability.
NR 270.002 General definitions.
NR 270.003 General provisions.
NR 270.01 Applicability: description of the iron ore subcategory.
NR 270.012 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.013 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.014 New source performance standards (NSPS).
NR 270.02 Applicability: description of the aluminum ore subcategory.
NR 270.022 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.023 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.024 New source performance standards (NSPS).
NR 270.03 Applicability; description of the uranium, radium and vanadium ores subcategory.
NR 270.032 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.033 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.034 New source performance standards (NSPS).
NR 270.04 Applicability; description of the mercury ore subcategory.
NR 270.042 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.043 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.044 New source performance standards (NSPS).
NR 270.05 Applicability; description of the titanium ore subcategory.
NR 270.052 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.053 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.054 New source performance standards (NSPS).
NR 270.06 Applicability; description of the tungsten ore subcategory.
NR 270.062 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.063 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.064 New source performance standards (NSPS).
NR 270.07 Applicability; description of the nickel ore subcategory.
NR 270.072 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.08 Applicability; description of the vanadium ore subcategory.
NR 270.082 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
NR 270.09 Applicability; description of the antimony ore subcategory.
NR 270.10 Applicability; description of the copper, lead, zinc, gold, silver, and molybdenum ores subcategory.
NR 270.102 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology (BPT).
NR 270.103 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.104 New source performance standards (NSPS).
NR 270.11 Applicability; description of the platinum ore subcategory.
NR 270.113 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
NR 270.12 Cross-references.
NR 270.001
NR 270.001 Purpose. The purpose of this chapter is to establish effluent limitations and standards of performance for discharges of process wastes from the ore mining and dressing category of point sources and its subcategories.
NR 270.001 History
History: Cr.
Register, October, 1986, No. 370, eff. 11-1-86.
NR 270.0015
NR 270.0015 Applicability. Abbreviations and methods of analysis set forth in
40 CFR Part 401 shall apply to this chapter except as provided in ss.
NR 270.002 and
270.003. The general provisions and definitions apply to all subcategories of this chapter unless otherwise noted.
NR 270.0015 History
History: Cr.
Register, October, 1986, No. 370, eff. 11-1-86.
NR 270.002
NR 270.002 General definitions. In addition to the definitions set forth in
40 CFR Part 401, the following definitions apply to this chapter:
NR 270.002(1)
(1) “Active mining area” is a place where work or other activity related to the extraction, removal, or recovery of metal ore is being conducted, except, with respect to surface mines, any area of land on or in which grading has been completed to return the earth to desired contour and reclamation work has begun.
NR 270.002(2)
(2) “Annual precipitation” and “annual evaporation” are the mean annual precipitation and mean annual lake evaporation, respectively, as established by the U.S. department of commerce, environmental science services administration, environmental data services, or equivalent regional rainfall and evaporation data.
NR 270.002(3)
(3) “Appropriate treatment of the recycle water” includes, but is not limited to pH adjustment, settling and pH adjustment, settling, and mixed media filtration.
NR 270.002(4)
(4) “Existing source” means any source that is not a new source.
NR 270.002(5)
(5) “Groundwater infiltration” means that water which enters the treatment facility as a result of the interception of natural springs, aquifers, or run-off which percolates into the ground and seeps into the treatment facility's tailings pond or wastewater holding facility and that cannot be diverted by ditching or grouting the tailings pond or wastewater holding facility.
NR 270.002(6)
(6) “In-situ leach methods” means the processes involving the purposeful introduction of suitable leaching solutions into a uranium ore body to dissolve the valuable minerals in place and the purposeful leaching of uranium ore in a static or semistatic condition either by gravity through an open pile, or by flooding a confined ore pile. It does not include the natural dissolution of uranium by groundwaters, the incidental leaching of uranium by mine drainage, nor the rehabilitation of aquifers and the monitoring of these aquifers.
NR 270.002(7)
(7) “Mill” means a preparation facility within which the metal ore is cleaned, concentrated, or otherwise processed before it is shipped to the customer, refiner, smelter, or manufacturer. A mill includes all ancillary operations and structures necessary to clean, concentrate, or otherwise process metal ore, such as ore and gangue storage areas and loading facilities.
NR 270.002(8)
(8) “Mine” is an active mining area, including all land and property placed under, or above the surface of such land, used in or resulting from the work of extracting metal ore or minerals from their natural deposits by any means or method, including secondary recovery of metal ore from refuse or other storage piles, wastes, or rock dumps and mill tailings derived from the mining, cleaning or concentration of metal ores.
NR 270.002(9)
(9) “Mine drainage” means any water drained, pumped, or siphoned from a mine.
NR 270.002(11)
(11) “New source,” as defined for BPT, BAT, BCT, and NSPS, means any point source the construction of which commenced after January 17, 1983.
NR 270.002(12)
(12) “Ten year, 24-hour precipitation event” is the maximum 24-hour precipitation event with a probable recurrence interval of once in 10 years as established by the U.S. department of commerce, national oceanic and atmospheric administration, national weather service, or equivalent regional or rainfall probability information.
NR 270.002 History
History: Cr.
Register, October, 1986, No. 370, eff. 11-1-86; correction in (10) made under s. 13.93 (2m) (b) 7., Stats.,
Register, November, 1997, No. 503.
NR 270.003(1)(1)
Combined waste streams. In the event that waste streams from various subcategories or segments of subcategories in this chapter are combined for treatment and discharge, the quantity and concentration of each pollutant or pollutant property in the combined discharge that is subject to effluent limitations may not exceed the quantity and concentration of each pollutant or pollutant property that could have been discharged had each waste stream been treated separately. In addition, the discharge flow from the combined discharge may not exceed the volume that could have been discharged had each waste stream been treated separately.
NR 270.003(2)
(2) Storm exemption for facilities permitted to discharge. If, as a result of precipitation or snowmelt, a source with an allowable discharge under this chapter has an overflow or excess discharge of effluent which does not meet the limitations of this chapter, the source may qualify for an exemption from such limitations with respect to such discharge if the following conditions are met:
NR 270.003(2)(a)
(a) The facility is designed, constructed, and maintained to contain the maximum volume of wastewater which would be generated by the facility during a 24-hour period without an increase in volume from precipitation and the maximum volume of wastewater resulting from a 10-year, 24-hour precipitation event or treat the maximum flow associated with these volumes. In computing the maximum volume of wastewater which would result from a 10-year, 24-hour precipitation event, the facility shall include the volume which would result from all areas contributing runoff to the individual treatment facility, i.e., all runoff that is not diverted from the active mining area and runoff which is not diverted from the mill area.
NR 270.003(2)(b)
(b) The facility takes all reasonable steps to maintain treatment of the wastewater and minimize the amount of overflow.
NR 270.003(2)(c)
(c) The facility complies with the notification requirements of
40 CFR 122.41 (m) and (n). The storm exemption is designed to provide an affirmative defense to an enforcement action. Therefore, the operator has the burden of demonstrating to the appropriate authority that the conditions have been met.
NR 270.003(3)
(3) Storm exemption for facilities not permitted to discharge. If, as a result of precipitation (rainfall or snowmelt), a source which is not permitted to discharge under this chapter, has an overflow or discharge which violates the limitations of this chapter, the source may qualify for an exemption from such limitations with respect to such discharge if the following conditions are met:
NR 270.003(3)(a)
(a) The facility is designed, constructed, and maintained to contain the maximum volume of wastewater stored and contained by the facility during normal operating conditions without an increase in volume from precipitation and the maximum volume of wastewater resulting from a 10-year, 24-hour precipitation event. In computing the maximum volume of wastewater which would result from a 10-year, 24-hour precipitation event, the facility shall include the volume which would result from all areas contributing runoff to the individual treatment facility, i.e., all runoff that is not diverted from the area or process subject to zero discharge, and other runoff that is allowed to commingle with the influent to the treatment system.
NR 270.003(3)(b)
(b) The facility takes all reasonable steps to minimize the overflow or excess discharge.
NR 270.003(3)(c)
(c) The facility complies with the notification requirements of
40 CFR 122.41 (m) and (n). The storm exemption is designed to provide an affirmative defense to an enforcement action. Therefore, the operator has the burden of demonstrating to the appropriate authority that the conditions have been met.
