NR 110.15(3)(e)(e) Protection of water supply wells. Wastewater lagoons or storage structures shall be located with a minimum separation distance of 1,000 feet from a community water system well, and 100 feet from a private water system well or any other well subject to ch. NR 812. Wastewater treatment plant effluent pipes shall be located with a minimum separation distance of 50 feet from a private water system well or any other well subject to ch. NR 812. NR 110.15(4)(a)(a) Conformance with facilities plan. The design capacity for municipally owned sewage treatment facilities shall be in accordance with s. NR 110.09 (2) (j). Privately owned domestic sewage treatment facilities shall provide design capacity for the estimated population 20 years from the time of start-up of the facility unless the cost-effective staging analysis in s. NR 110.09 (2) (j) 4. justifies a lesser design staging period. NR 110.15(4)(b)1.1. The domestic design biochemical oxygen demand and suspended solids loading for upgrading or expanding existing sewage treatment facilities, or for the construction of new sewage treatment facilities to replace an existing facility shall be based on actual sewage and operating records from the existing facilities. The design shall include an appropriate growth increment. NR 110.15(4)(b)2.2. When actual operating data is not available, the design loading shall be based on a contribution of 0.08 kilograms (0.17 pounds) of biochemical oxygen demand per capita per day and 0.09 kilograms (0.20 pounds) of suspended solids per capita per day. When garbage grinders are used in areas tributary to a sewage treatment facility, the design basis shall be increased to 0.10 kilograms (0.22 pounds) of biochemical oxygen demand per capita per day, and 0.22 kilograms (0.25 pounds) of suspended solids per capita per day. NR 110.15(4)(b)3.3. Sewage treatment facilities which will receive industrial or commercial wastewater shall be designed to include these waste flows. NR 110.15(4)(c)(c) Hydraulic loading. The design wastewater flow shall be estimated in accordance with s. NR 110.09 (2) (j). When flow or water use records do not exist, the maximum hour design flow shall be estimated by multiplying the average design flow by the appropriate peaking factor shown in Table 2. Table 2
NR 110.15(5)(a)(a) Design of conduits. All piping and channels shall be designed to carry the peak design flow rate. The incoming sewer should be designed for unrestricted flow. Bottom corners of the channels must be filleted. Conduits shall be designed to avoid creation of pockets and corners where solids can accumulate. Suitable gates shall be placed in channels to seal off unused sections in which solids might accumulate. The use of shear gates or stop planks may be used in place of gate valves or sluice gates. NR 110.15(5)(b)(b) Arrangement of units. Component parts of the facility shall be arranged for greatest operating and maintenance convenience, flexibility, economy, continuity of effluent quality, and ease of installation of future units. NR 110.15(5)(c)(c) Flow measurement. Equipment for flow measurement and recording shall be provided for the total waste flow. Equipment for measuring flow streams within the treatment facility should be provided to aid facility operation. NR 110.15(5)(d)(d) Emergency operation. At least one of the following shall be provided to ensure continued operation of the sewage treatment facility in accordance with s. NR 210.08: NR 110.15(5)(d)1.1. ‘Emergency power generator.’ An emergency power generator with sufficient generating capacity to meet the sewage treatment facility power demands to comply with s. NR 210.08. NR 110.15(5)(d)2.2. ‘Two independent electrical transmission sources.’ An electrical system connected to two independent transmission routes that receive power from the same electrical grid network which supplies power to the sewage treatment facility service area. NR 110.15(5)(d)3.3. ‘Holding facilities.’ Holding facilities that have a capacity to detain the maximum day design flow for a maximum period of 24 hours. NR 110.15(5)(e)(e) New processes, methods and equipment. The department encourages the development of new process, methods, or equipment for the treatment of sewage. However, where new processes, methods, or equipment are proposed and where limited data is available which demonstrates the performance of the equipment, the department may require written certification that the use or design of the equipment is in accordance with the manufacturer’s guidelines. Furthermore, the department may require the posting of a performance bond by the manufacturer. NR 110.15(5)(f)(f) Disinfection. Disinfection shall be provided in accordance with WPDES permit requirements. NR 110.15(5)(g)(g) Controlled diversion structures and equipment. Structures and equipment to enable controlled diversions shall be located and arranged to allow for proper maintenance of the sewage treatment facility. In all cases, it must be possible for each treatment unit to be independently removed from service. NR 110.15 NoteNote: Section NR 205.07 (1) (u) 2. contains specific provisions associated with the use of controlled diversion structures and equipment and requires compliance with all permit effluent limitations during times of controlled diversion. NR 110.15(5)(h)(h) Sewage treatment facility overflow structures. Sewage treatment facility overflow structures may be provided at an owner’s discretion as a measure to protect sewage treatment facility integrity and treatment efficiency during severe operating conditions. Sewage treatment facility overflow structures may not be installed at the headworks of aerated or stabilization pond treatment systems. Sewage treatment facility overflow structures shall be designed in accordance with all the following requirements: NR 110.15(5)(h)1.1. The overflow may be activated by either manual or automatic means. If automatically activated, a monitoring system shall be provided to detect the initiation time of the overflow and to provide an alarm signal to the sewage treatment facility operator or other responsible authority. NR 110.15(5)(h)2.2. The structure shall be designed to discharge only those wastewater flows above the peak flow rate that the sewage treatment facility can safely process without threatening loss of life, causing severe property damage, or compromising treatment processes, including the washout of biological media in the biological treatment process. NR 110.15(5)(h)3.3. Equipment shall be provided to measure the flow and sample the wastewater that is discharged from the structure. NR 110.15 NoteNote: A department approval of a sewage treatment facility overflow structure does not eliminate or alleviate the requirement that prohibits sewage treatment facility overflows in s. NR 210.21.
