NR 811.60(5)(e)(e) An automatic shutdown valve shall be installed in the water supply line prior to the ultraviolet treatment device. When power is not provided the valve shall be in the closed position. NR 811.60(5)(f)(f) The inlet and outlet piping to the reactors shall assure that the UV dose delivery is equal to or greater than the UV dose delivered during validation. NR 811.60(5)(g)(g) The flow to each reactor shall be equally distributed and metered. NR 811.60(5)(h)(h) Valves shall be provided to allow isolating and removing from service each UV reactor. NR 811.60(5)(i)(i) Reactors shall be provided with air relief and pressure control valves per manufacturer requirements. NR 811.60(5)(j)(j) UV transmittance (UVT) analyzers shall be provided if UVT is part of the dose monitoring strategy. NR 811.60(5)(k)(k) Sample taps shall be provided downstream of each reactor. NR 811.60(6)(a)(a) A delay mechanism shall be installed to provide sufficient lamp warm-up prior to allowing water to flow from the ultraviolet treatment unit. NR 811.60(6)(b)(b) An automatic shutdown shall be designed to activate the shutdown valve in cases where the ultraviolet light dose falls below the approved design dose or outside of the validated specifications. NR 811.60(6)(c)(c) Where the UV is necessary to provide adequate disinfection, 99.9 percent of the volume of water passing through the reactors shall receive UV light treatment within the validated specifications. This may require the use of a bleed line from the reactors during lamp warm up and cool down periods. NR 811.60(7)(7) Back-up. A sufficient number of parallel ultraviolet treatment devices shall be installed to insure that adequate disinfection is provided when one unit is out of service. The department may approve an alternate method that provides adequate disinfection. NR 811.60(8)(8) Treatment bypass. No bypass of the ultraviolet treatment process may be installed unless an alternate method of providing adequate disinfection is provided. NR 811.60(9)(9) Monitoring. Continuous monitoring of UV intensity as measured by a UV sensor, flow rate, and lamp status shall be provided for each ultraviolet treatment device to demonstrate that the device is operating within the range of conditions for which it was validated for the required UV dose. Each monitoring device shall be connected to the control system for the shutdown valve for the respective ultraviolet treatment device. The department may require additional monitoring devices and control systems if any of the water quality characteristics listed in Table No. 3 are representative of the water to be treated and may impair the effectiveness of the ultraviolet light treatment. NR 811.60(10)(10) Chlorine addition. Unless waived by the department, chlorine shall be added after UV for virus inactivation and to provide a residual in the distribution system. NR 811.60(11)(11) Pilot testing. Pilot testing is generally not required unless factors such as fouling or aging cannot be predicted by bench-scale testing. NR 811.60 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (intro.), (3), (5) (c) Register January 2024 No. 817, eff. 2-1-24. NR 811.605NR 811.605 Treatment for other contaminants. A water system owner shall justify treatment systems designed for the removal of other contaminants not regulated under this chapter or ch. NR 809 through department-approved pilot testing under s. NR 811.44. NR 811.605 HistoryHistory: CR 22-074: cr. Register January 2024 No. 817, eff. 2-1-24. NR 811.61NR 811.61 General. The department may approve the use of hydro-pneumatic, or pressure, tanks, as provided in s. NR 811.62 (2). All of the following requirements shall be met: NR 811.61(1)(1) The tanks shall be completely housed, or earth-mounded with one end projecting into an operating house, to prevent freezing. A tank may be installed below grade if one end is exposed in a basement, vault or manhole. If the tank is installed below grade, all electrical controls and air release valves and any other appurtenances which may permit contamination of the water supply shall be extended to at least 24 inches above grade. Air release piping extended above grade shall be terminated in a down-turned U-bend screened with a 24-mesh corrosion resistant screen. The basement, vault or manhole shall be constructed to prevent surface water from entering including sealing any annular spaces where pipes and appurtenances pass through a wall, floor or ceiling. The basement, vault or manhole shall be equipped with heating, ventilation and dehumidification equipment if necessary to prevent excessive corrosion of the pressure tank and associated piping or to prevent water from freezing. Access manholes shall terminate a minimum of 24 inches above grade with an overlapping, locking cover. Vent pipes shall be metal and terminate a minimum of 24 inches above grade in a downward facing U-bend screened with a 24-mesh corrosion resistant screen. Doors shall open outward and be provided with a lock. NR 811.61(2)(2) Each tank shall be provided with bypass piping and the necessary shut-off valves to permit operation of the system while the tank is being repaired or painted. For galvanized or bladder type pressure tanks, the individual connecting pipe to each tank shall be provided with a shut-off valve, pipe union and drain fitting. Threaded drain fittings shall be provided with a vacuum breaker. NR 811.61(3)(3) Each tank not equipped with a bladder or diaphragm to separate the air and water and with a gross volume of 500 gallons or more shall have a drain fitting with shut-off valve and control equipment consisting of a pressure gauge, a pressure relief valve, a water sight glass, an automatic air blow-off, and pressure or probe operated start-stop controls for the pumps. NR 811.61(4)(4) Each tank not equipped with a bladder or diaphragm to separate the air and water and with a gross volume of 500 gallons or more or that will be painted inside shall be provided with an access manhole. If the tank interior is to be painted it shall be painted with NSF/ANSI approved paints in accordance with s. NR 810.09 (5). NR 811.61(5)(5) Each tank not equipped with a bladder or diaphragm to separate the air and water and with a gross volume of 500 gallons or more shall be provided with an automatically controlled air compressor to add air to the tank. All compressors used to routinely add air to tanks shall be oil-less. Larger capacity compressors that are not oil-less may be used temporarily to fill a tank upon startup, repair or service but shall be fitted with one or more filters and any other appurtenances necessary to remove particulates and oil from the air prior to injection. NR 811.61(6)(6) Each tank equipped with a diaphragm or bladder shall be equipped with an air inlet for adding air manually, a pressure relief valve for each tank or bank of tanks sized to handle the maximum flow rate, and pressure-operated start up and shut down controls for the well pump. NR 811.61(7)(7) The gross volume, in gallons, of any tank or combination of tanks, shall be at least 10 times the maximum pump capacity, rated in gallons per minute, unless the proposed pump motor or motors will be controlled by a variable output control device in a manner intended to reduce the volume of required pressure tank storage in accordance with s. NR 811.34 (6). NR 811.61 NoteNote: The department recommends that the storage volume provides a minimum pump run time of at least 2 minutes.