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NR 811.81(2) (2) The pump capacities for domestic service only shall be as established in Figure No. 1 in the Appendix, or as justified by additional engineering studies. Fire protection shall be provided if feasible and will require additional engineering studies.
NR 811.81(3) (3) Pumping stations which serve more than 50 living units shall be designed such that the peak demand can be met with the largest pump out of service.
NR 811.81(4) (4) For pumps not directly supplied by an adjacent reservoir or elevated tank, the suction pressure shall be at least 35 psi when the pumps are supplying design flow rates. An automatic cutoff control shall be provided that will stop the pumps when the suction pressure falls below 20 psi.
NR 811.81(5) (5) For pumps supplied by an adjacent but not physically connected reservoir or elevated tank, the suction pressure shall be at least 3 psi under all pumping conditions. An automatic cutoff control shall be provided that will stop the pumps when the suction pressure falls below 3 psi.
NR 811.81(6) (6) For those stations servicing a boosted zone without elevated storage, one of the following shall be provided:
NR 811.81(6)(a) (a) A continuously running pump to maintain pressure in the boosted zone. A small feed back line or other means shall be provided to prevent the pump from overheating.
NR 811.81(6)(b) (b) A single speed pump and one or more hydro-pneumatic tanks with a total gross volume at least ten times the rated gallon per minute capacity of the pump.
NR 811.81(6)(c) (c) A pump fitted with a 2 to 3 minute minimum run timer and one or more hydro-pneumatic tanks to prevent frequent pump cycling.
NR 811.81(6)(d) (d) A pump controlled by a variable output control device along with one or more hydro-pneumatic tanks having a total gross volume meeting the requirements of s. NR 811.34 (6).
NR 811.81 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.82 NR 811.82 Storage requirements. Elevated storage is not required for a boosted pressure zone where the primary pressure zone can provide minimum pressures of 35 psi at street elevation in all areas of the boosted zone. Elevated storage facilities shall be provided for a boosted pressure zone serving more than 50 living units in any of the following situations:
NR 811.82(1) (1) If the primary pressure zone cannot maintain pressures of 3 psi or greater at street elevation in all areas served by the booster pumps including situations where emergency power is provided.
NR 811.82(2) (2) If the primary pressure zone provides pressures of 3 to 35 psi at street elevation in all areas served by the booster pumps and an emergency power source is not provided for the booster station.
NR 811.82 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.83 NR 811.83 Emergency power requirements. Boosted pressure zone emergency power installations shall meet the following requirements:
NR 811.83(1) (1) Emergency power shall be provided if 50 or fewer living units are being served and the primary pressure zone cannot maintain positive pressures of 3 psi or greater at street elevation in all areas served by the booster pumps, and sufficient elevated storage is not provided.
NR 811.83(2) (2) Emergency power shall be provided if more than 50 living units are being served and the primary pressure zone cannot maintain pressures of 20 psi or greater at street elevation in all areas served by the booster pumps, and sufficient elevated storage is not provided.
NR 811.83(3) (3) Emergency power shall consist of a dedicated on-site engine-generator set with an automatic transfer switch capable of powering at minimum the domestic service pumps and station building demands.
NR 811.83 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.84 NR 811.84 Station requirements.
NR 811.84(1) (1) The on-off operation of the pumps and the system pressure at the booster station shall be monitored at one of the main waterworks pumping stations, other waterworks facility, or wherever the master control panel is located. At stations serving 50 or fewer living units, monitoring may be provided by a light or an audible alarm placed in a conspicuous location outside the station to indicate pump failure. A continuous recording pressure device may be provided.
NR 811.84(2) (2) Pressure gauges shall be provided on the booster pump suction and discharge lines.
NR 811.84(3) (3) A flow meter shall be provided, if practical, in the booster pump discharge line. Booster pump motors shall be provided with hour meters if a flow meter will not be installed.
NR 811.84(4) (4) A metal smooth end sampling faucet shall be installed on the combined booster pump discharge piping.
NR 811.84(5) (5) The design shall provide for automatically bypassing the pumping units when the pumps are not operating.
NR 811.84(6) (6) The design shall include piping and shut-off valves for manually bypassing the station when the station is out of service.
NR 811.84(7) (7) If chemical addition is necessary, the station shall be provided with a separate chemical room meeting the requirements of subchs. VI and VII.
NR 811.84(8) (8) General requirements for above grade stations are listed in subch. IV.
NR 811.84(9) (9) Underground stations shall be equipped with heating, ventilation, and dehumidification equipment. Sump and sump pump equipment shall be provided unless a discharge to the ground surface can be provided. Access manways shall terminate a minimum of 24 inches above grade with an overlapping, locking cover. Sump pump discharge and vent pipes shall be metal and terminate a minimum of 24 inches above grade in a downward facing U-bend with a 24-mesh corrosion resistant screen. Chemical addition equipment may not be installed in underground stations.
NR 811.84 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
subch. XII of ch. NR 811 Subchapter XII — Waste Disposal
NR 811.85 NR 811.85 General. The discharge of pollutants from a waterworks facility into the waters of the state or into a publicly owned treatment works, as those terms are defined in s. 283.01, Stats., shall conform to all the applicable requirements of ch. 283, Stats., and the rules adopted under ch. 283, Stats. Provisions shall be made for proper disposal of all wastes from waterworks facilities. Wastes may be from sanitary facilities, laboratories, or treatment plants. If new methods are proposed or the treatment results are uncertain, the department may require laboratory, pilot, or full-scale testing to establish design parameters. Sections NR 811.853 to 811.862 contain general standards to be utilized in meeting the requirements of ch. 283, Stats. System owners proposing discharges other than to already permitted wastewater treatment plants shall obtain a WPDES permit.
NR 811.85 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.851 NR 811.851 Sanitary wastes. Wastes from toilet facilities shall be discharged to a sanitary sewer system. The floor elevation to a building from which there is a discharge shall be constructed at least one foot above the rim of the nearest sanitary sewer manhole in accordance with s. NR 811.25 (1) (h) to prevent contamination from sewer backup. Where a sanitary sewer system is not available, the installation of an individual POWTS may be approved by the department if the installation meets ch. SPS 383 requirements and if the POWTS separation distances to a community water system well shall comply with the requirements of s. NR 811.12 (5) (d).
NR 811.851 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
NR 811.852 NR 811.852 Floor drainage. Floor drains in pump stations and treatment plants shall comply with the requirements of s. NR 811.25 (1) (h).
NR 811.852 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.853 NR 811.853 Backwash wastewater from iron and manganese filters.
NR 811.853(1)(1) Discharge to sanitary sewer. Backwash wastewater from iron and manganese removal filters may be discharged to a sanitary sewer if the discharge will not overload the facilities or adversely affect the wastewater treatment process. The radionuclide content of the wastewater shall comply with s. NR 811.856. An equalization tank shall be provided when it is necessary to prevent overloading the sewers or wastewater treatment plant.
NR 811.853(2) (2)Discharge to sand filters. All of the following requirements apply when sand filters are used to treat backwash wastewater from iron and manganese removal filters:
NR 811.853(2)(a) (a) Filters shall be designed for a maximum rate of 35 gallons per square foot per day except if testing indicates that higher rates will not cause excessive plugging of the media and a quality effluent can be maintained. Sufficient surface area shall be provided so that during any filtration cycle the wastewater depth over the media does not exceed 2 feet. The filters shall be sized to handle the entire backwash volume from all of the filters at the treatment plant unless the filters are washed on a rotating schedule.
NR 811.853(2)(b) (b) No filter, regardless of the volume of water to be handled, may be smaller than 100 square feet in area. Multiple units may be necessary to facilitate cleaning.
NR 811.853(2)(c) (c) The filter media shall consist of a minimum of 12 inches of sand, 3 to 4 inches of supporting small gravel or torpedo sand, and 9 inches of gravel in graded layers. All fines shall be removed from the media by washing. The filter sand shall have an effective size of 0.3 to 0.5 mm and a uniformity coefficient not exceeding 3.5.
NR 811.853(2)(d) (d) An adequate underdrainage collection system shall be provided. Provision shall be made for sampling the filter effluent.
NR 811.853(2)(e) (e) A cover shall be provided which prevents freezing during the winter months.
NR 811.853(2)(f) (f) The filter shall be located in an area not subject to flooding, and the site shall be graded to prevent ponding of surface runoff. Finished grade elevation shall be designed to facilitate maintenance, cleaning, and removal or replacement of surface sand. An overflow may not be provided.
NR 811.853(2)(g) (g) The radionuclide content of the wastewater shall comply with s. NR 811.856.
NR 811.853(3) (3)Discharge to lagoons. Lagoons used to settle backwash wastewater from iron and manganese removal filters shall meet all of the following design requirements:
NR 811.853(3)(a) (a) Lagoons shall be designed with a volume which is 10 times the total quantity of wastewater discharged during any 24-hour period.
NR 811.853(3)(b) (b) Lagoon length shall be 4 times the width, and the width shall be at least 3 times the depth.
NR 811.853(3)(c) (c) Adequate inlet and outlet devices shall be provided so that velocity currents are minimized.
NR 811.853(3)(d) (d) The radionuclide content of the wastewater shall comply with s. NR 811.856.
NR 811.853(4) (4)Discharge to detention tanks. Detention tanks used to settle backwash wastewater from iron and manganese removal filters shall meet all of the following design requirements:
NR 811.853(4)(a) (a) Detention tanks shall be designed to maximize settling by means of inlet piping and baffling configurations. Tanks shall be of sufficient capacity to hold at least 2 complete backwash cycles. The floor shall be sloped to a sump and access manholes provided to facilitate cleaning. A cover shall be provided to prevent freezing.
NR 811.853(4)(b) (b) Pumps shall be provided to discharge the decant water to a storm sewer or receiving watercourse over approximately a 24-hour period. A convenient means of sampling the effluent shall be provided. Any discharge requires a WPDES permit. The radionuclide content of the wastewater shall comply with s. NR 811.856.
NR 811.853(4)(c) (c) Decant water to be returned to the water treatment plant shall meet the requirements of s. NR 811.862.
NR 811.853(4)(d) (d) Settled sludge removed from detention tanks shall be disposed of at a wastewater treatment plant unless the department approves an alternate disposal location on a case-by-case basis.
NR 811.853 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.854 NR 811.854 Brine wastes from ion exchange plants. The department may allow brine wastes to be discharged to a sanitary sewer system or to a watercourse if sufficient flow is available to provide adequate dilution to meet water quality or effluent standards. Dilution in streams shall be based on the 7-day low flow for the previous 10-year period. Except if discharging to large waterways or sewerage systems that will not be overloaded by the discharge, the minimum requirement shall be an equalization tank of sufficient size to allow brine discharge over a 24-hour period. The radionuclide content of the wastewater shall comply with s. NR 811.856.
NR 811.854 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.855 NR 811.855 Wastewater from reverse osmosis plants. The department may allow reject wastewater from reverse osmosis membranes to be discharged to a sanitary sewer system or to a watercourse if sufficient flow is available to provide adequate dilution to meet water quality or effluent standards. Dilution in streams shall be based on the 7-day low flow for the previous 10-year period. Except if discharging to large waterways or sewerage systems that will not be overloaded by the discharge, the minimum requirement shall be an equalization tank of sufficient size to allow reject wastewater discharge over a 24-hour period. The radionuclide content of the wastewater shall comply with s. NR 811.856.
NR 811.855 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.856 NR 811.856 Water treatment plant wastewater radionuclide content compliance with the unity equation. Levels of radium and uranium in water treatment plant wastewater to be discharged to a sanitary sewer or to surface water shall meet all of the following requirements:
NR 811.856(1) (1)Unity equation. The levels of radium and uranium in the wastewater shall meet the limits of the Unity Equation as calculated based upon the requirements of the department of health services under s. DHS 157.30 (3) and Appendix E of ch. DHS 157.
NR 811.856(2) (2)Calculations.
NR 811.856(2)(a)(a) Unity Equation calculations shall be performed for water treatment plants treating wells with combined radium-226 and radium-228, uranium, or both exceeding the maximum contaminant level unless required by the department in individual cases or if other less common radionuclide elements may be of concern.
NR 811.856(2)(b) (b) The water system owner or its consultant shall submit the Unity Equation assumptions and calculations to the department for review and approval before, or along with, the submission of plans and specifications to the department for the radionuclide removal water treatment equipment or plant.
NR 811.856(3) (3)Corrective actions. Corrective action as approved by the department shall be taken, if necessary, to maintain the result of the Unity Equation calculations as less than one.
NR 811.856 Note Note: The department's Public Water Supply Section located in Madison may be contacted to obtain a copy of DNR Application of DHS Radionuclide Wastewater Disposal Criteria for help in addressing Unity Equation issues.
NR 811.856 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (1) made under s. 13.92 (4) (b) 7., Stats., Register November 2010 No. 659.
NR 811.857 NR 811.857 Backwash wastewater from lime softening water treatment plants. Filter backwash wastewater from lime softening water treatment plants shall be disposed of by any of the following methods:
NR 811.857(1) (1) Returned to the inlet end of the plant in accordance with the requirements of s. NR 811.862.
NR 811.857(2) (2) Direct or controlled discharge to a sanitary sewer system may be allowed by the department if the discharge will not overload the facilities or adversely affect the wastewater treatment process.
NR 811.857(3) (3) Discharge to surface water. Suspended solids shall be removed from the filter backwash wastewater before the filter backwash wastewater is discharged to surface water. This will require settling and possibly coagulation. Any discharge requires a WPDES Permit.
NR 811.857 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.858 NR 811.858 Lime softening sludge. Sludge from plants using lime to soften water will vary in quantity and in chemical characteristics depending on the softening process and the chemical characteristics of the water being softened. The department shall determine special disposal requirements for sludge from plants treating water containing radium-226, radium-228, or uranium. These special requirements shall modify the requirements for specific disposal methods. The requirements for specific disposal methods are as follows:
NR 811.858(1) (1)Lagoons. The design shall meet the following minimum requirements:
NR 811.858(1)(a) (a) Locations free from flooding, with grading or ditching to divert surface runoff.
NR 811.858(1)(b) (b) Minimum lagoon depth of 4 to 5 feet with interior and exterior slopes of 3:1.
NR 811.858(1)(c) (c) Two years solids storage volume for temporary lagoons and 8- to 10-years storage volume for permanent lagoons.
NR 811.858(1)(d) (d) Multiple cells to provide flexibility in operation.
NR 811.858(1)(e) (e) Adjustable decanting devices.
NR 811.858(1)(f) (f) Means of convenient cleaning where appropriate.
NR 811.858(2) (2)Application to agricultural land. The department may allow liquid sludge to be applied to agricultural land by tank truck if the solids do not exceed 10 to 12% by weight. This method requires proper handling facilities, vehicles, and equipment to allow hauling and spreading which does not create a nuisance. Adequate sludge holding facilities are required for use during times that trucks cannot operate. Higher solids content sludges may also be spread. However, prior to increasing the solids content the local department sludge management specialist shall be contacted to evaluate the acceptability of spreading the high solids sludge. Land application of sludge, including the radium-226 content, shall comply with the applicable requirements of s. NR 204.07.
NR 811.858(3) (3)Discharge to sanitary sewer. Discharge to sanitary sewer may be utilized if a study or experience has shown that problems will not occur in the sewage collection system or at the wastewater treatment plant. An equalization tank may be necessary to even out flows to the sewer system. The radionuclide content of the sludge shall comply with s. NR 811.856.
NR 811.858(4) (4)Mechanical dewatering. Pilot testing of mechanical dewatering is necessary to show the results that may be obtained. The department shall review and approve proposals on a case-by-case basis to insure that water quality and effluent requirements will be met.
NR 811.858 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.
NR 811.859 NR 811.859 Spent media.
NR 811.859(1)(1) General. Spent media from water treatment plants may require special handling and disposal. The department shall evaluate on a case-by-case basis the proper handling and disposal techniques for spent media under any of the following circumstances:
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.