NR 811.23(1)(d)(d) Be equipped with a minimum of 2 removable or traveling screens or an equivalent means of screening before the pump suction well. Systems with only one screen shall be provided with a bypass. NR 811.23(1)(e)(e) Provide chlorination or other chemical addition facilities for raw water transmission mains. NR 811.23(1)(f)(f) Have the intake piping valved with provisions for backflushing, testing for leaks, and control of frazil ice. NR 811.23(1)(i)(i) Be designed so sanitary sewer and finished water piping located within the shore well is installed in a manner to protect the shore well water quality and preserve the quality of the finished water. It is recommended that piping not be installed above the shore well to allow for access to the piping for routine maintenance. NR 811.23(1)(j)(j) Water discharged from traveling screens and hub drains within the shore well station may discharge into the shore well. NR 811.23(2)(2) The requirements in sub. (1) may be waived by the department on a case-by-case basis if it is demonstrated that they are not necessary to fulfill the other requirements of this chapter. NR 811.23 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (1) (f), cr. (1) (i), (j) Register January 2024 No. 817, eff. 2-1-24. NR 811.231NR 811.231 Off-Stream raw water storage. NR 811.231(1)(1) Definition. In this section, “off-stream raw water storage reservoir” is defined as a facility into which water is pumped during periods of good quality and high stream flow for future release to the treatment facilities. NR 811.231(2)(2) Construction. Off-stream raw water storage reservoirs shall be constructed to assure all of the following: NR 811.231(2)(a)(a) Water quality is protected by controlling runoff into the reservoir. NR 811.231(2)(b)(b) Dikes are structurally sound and protected against wave action and erosion. NR 811.231(2)(d)(d) Point of influent flow is separated from the point of withdrawal, with separate pipes for influent to and effluent from the reservoir. NR 811.231(2)(f)(f) The reservoir is surrounded by a fence and unauthorized access is prevented. NR 811.231(2)(i)(i) A bypassing line is provided to allow for direct pumping to the treatment facilities. NR 811.231 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (2) (d), (g), cr. (2) (i) Register January 2024 No. 817, eff. 2-1-24. NR 811.232(1)(1) If the department determines that chemical treatment is warranted for taste and odor control or the control of zebra and other mussels and other nuisance organisms in an intake structure, all of the following requirements shall be met: NR 811.232(1)(a)(a) Chemical treatment shall be installed in accordance with subch. VI and plans and specifications shall be approved by the department prior to installation. NR 811.232(1)(b)(b) Solution piping and diffusers shall be installed within the intake pipe or in a suitable carrier pipe. Provisions shall be made to prevent dispersal of chemicals into the water environment outside the intake. Diffusers shall be located and designed to protect all intake structure components. NR 811.232(1)(c)(c) A spare solution line shall be installed to provide redundancy and to facilitate the use of alternate chemicals. NR 811.232(1)(d)(d) Chemical feeders shall be interlocked with the plant system controls to shut down the chemical feed pump automatically when the raw water flow stops. NR 811.232(1)(e)(e) A sample line out to the intake shall be provided which will allow for collecting raw water samples unless the chemical control system will be shut off for periods sufficient to collect raw water samples at the shore well.