NR 440.688(2)(u)(u) “Stack emissions” means the particulate matter that is released to the atmosphere from a capture system. NR 440.688(2)(v)(v) “Storage bin” means a facility for storage, including surge bins, for nonmetallic minerals prior to further processing or loading. NR 440.688(2)(w)(w) “Transfer point” means a point in a conveying operation where the nonmetallic mineral is transferred to or from a belt conveyor except where the nonmetallic mineral is being transferred to a stockpile. NR 440.688(2)(x)(x) “Truck dumping” means the unloading of nonmetallic minerals from movable vehicles designed to transport nonmetallic minerals from one location to another. Movable vehicles include but are not limited to: trucks, front end loaders, skip hoists, and railcars. NR 440.688(2)(y)(y) “Vent” means an opening through which there is mechanically induced air flow for the purpose of exhausting from a building air carrying particulate matter emissions from one or more affected facilities. NR 440.688(2)(ym)(ym) “Wet mining operation” means a mining or dredging operation designed and operated to extract any nonmetallic mineral regulated under this section from deposits existing at or below the water table, where the nonmetallic mineral is saturated with water. NR 440.688(2)(z)(z) “Wet screening operation” means a screening operation at a nonmetallic mineral processing plant that removes unwanted material or that separates marketable fines from the product by a washing process which is designed and operated at all times such that the product is saturated with water. NR 440.688(3)(a)(a) On and after the date on which the performance test required to be conducted by s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any transfer point on belt conveyors or from any other affected facility any stack emissions which meet both of the following criteria: NR 440.688(3)(a)2.2. Exhibit greater than 7% opacity, unless the stack emissions are discharged from an affected facility using a wet scrubbing control device. Facilities using a wet scrubber shall comply with the reporting provisions of sub. (7) (c) to (e). NR 440.688(3)(b)(b) On and after the sixtieth day after achieving the maximum production rate at which the affected facility will be operated, but not later than 180 days after initial startup as required under s. NR 440.11, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any transfer point on belt conveyors or from any other affected facility any fugitive emissions which exhibit greater than 10% opacity except as provided in pars. (c) to (e). NR 440.688(3)(c)(c) On and after the sixtieth day after achieving the maximum production rate at which the affected facility will be operated, but not later than 180 days after initial startup as required under s. NR 440.11, no owner or operator may cause to be discharged into the atmosphere from any crusher, at which a capture system is not used, fugitive emissions which exhibit greater than 15% opacity. NR 440.688(3)(d)(d) Truck dumping of nonmetallic minerals into any screening operation, feed hopper, or crusher is exempt from the requirements of this subsection. NR 440.688(3)(e)(e) If any transfer point on a conveyor belt or any other affected facility is enclosed in a building, then each enclosed affected facility shall comply with the emission limits in pars. (a), (b) and (c), or the building enclosing the affected facility or facilities shall comply with the following emission limits: NR 440.688(3)(e)1.1. No owner or operator may cause to be discharged into the atmosphere from any building enclosing any transfer point on a conveyor belt or any other affected facility any visible fugitive emissions except emissions from a vent as defined in sub. (2). NR 440.688(3)(e)2.2. No owner or operator may cause to be discharged into the atmosphere from any vent of any building enclosing any transfer point on a conveyor belt or any other affected facility emissions which exceed the stack emissions limits in par. (a). NR 440.688(3)(f)(f) On and after the sixtieth day after achieving the maximum production rate at which the affected facility will be operated, but not later than 180 days after initial startup as required under s. NR 440.11, no owner or operator may cause to be discharged into the atmosphere from any baghouse that controls emissions from only an individual, enclosed storage bin, stack emissions which exhibit greater than 7% opacity. NR 440.688(3)(g)(g) Owners or operators of multiple storage bins with combined stack emissions shall comply with the emission limits in par. (a) 1. and 2. NR 440.688(3)(h)(h) On and after the sixtieth day after achieving the maximum production rate at which the affected facility will be operated, but not later than 180 days after initial startup, no owner or operator may cause to be discharged into the atmosphere any visible emissions from: NR 440.688(3)(h)1.1. Wet screening operations and subsequent screening operations, bucket elevators, and belt conveyors that process saturated material in the production line up to the next crusher, grinding mill or storage bin. NR 440.688(3)(h)2.2. Screening operations, bucket elevators, and belt conveyors in the production line downstream of wet mining operations, where the screening operations, bucket elevators, and belt conveyors process saturated materials up to the first crusher, grinding mill or storage bin in the production line. NR 440.688(4)(a)(a) The cost of replacement of ore-contact surfaces on processing equipment may not be considered in calculating either the “fixed capital cost of the new components” or the “fixed capital cost that would be required to construct a comparable new facility” under s. NR 440.15. Ore-contact surfaces are crushing surfaces; screen meshes, bars, and plates; conveyor belts; and elevator buckets. NR 440.688(4)(b)(b) Under s. NR 440.15, the “fixed capital cost of the new components” includes the fixed capital cost of all depreciable components (except components specified in par. (a)) which are or will be replaced pursuant to all continuous programs of component replacement commenced within any 2-year period following August 31, 1983. NR 440.688(5)(5) Monitoring of operations. The owner or operator of any affected facility subject to the provisions of this section which uses a wet scrubber to control emissions shall install, calibrate, maintain and operate the following monitoring devices: NR 440.688(5)(a)(a) A device for the continuous measurement of the pressure loss of the gas stream through the scrubber. The monitoring device shall be certified by the manufacturer to be accurate within ± 250 pascals (± 1 inch water) gauge pressure and shall be calibrated on an annual basis in accordance with manufacturer’s instructions. NR 440.688(5)(b)(b) A device for the continuous measurement of the scrubbing liquid flow rate to the wet scrubber. The monitoring device shall be certified by the manufacturer to be accurate within ± 5% of design scrubbing liquid flow rate and shall be calibrated on an annual basis in accordance with manufacturer’s instructions.