SPS 382.30(10)(a)1.1. `General.' All sanitary building subdrains shall discharge into an approved, vented sump with an airtight cover. The sump shall be so located as to receive the wastewater by gravity flow, and shall be located at least 25 feet from any water well or as otherwise approved by the department of natural resources.
SPS 382.30(10)(a)2.
2. `Capacity.' Except as provided in pars.
(c) and
(d), the minimum capacity of the sump shall be determined in accordance with the provisions of subd.
2. a. to
e. Capacity shall be based on one pump only.
SPS 382.30(10)(a)2.a.
a. The water supply fixture unit method shall be used to determine peak input flow in gallons per minute; only the fixtures that drain to the sump shall be included.
SPS 382.30 Note
Note: When converting water fixture units to gallons per minute it is permissible to calculate the load as a supply system with predominantly flush tanks.
SPS 382.30(10)(a)2.b.
b. The capacity of the sump shall be such that the pump when actuated by the lowest “pump on" switch runs at least 20 seconds.
SPS 382.30(10)(a)2.c.
c. Between the highest “pump on" switch level and the sump inlet, the sump shall hold the amount of input that exceeds the discharge of the pumping equipment in a 5 minute peak input period. In no case shall the vertical distance between the switch and the inlet be less than 3 inches.
SPS 382.30(10)(a)2.d.
d. The low water level shall be maintained in accordance with the pump manufacturer's requirements, but shall not be less than 4
‶ above the sump bottom.
SPS 382.30(10)(a)2.e.
e. Sumps containing one pump shall have an inside diameter of at least 24". Sumps containing 2 pumps shall have an inside diameter of at least 30
‶.
SPS 382.30 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.30(10)(a)4.
4. `Materials.' All sumps shall be constructed in a watertight manner of approved materials in accordance with ch.
SPS 384.
SPS 382.30(10)(a)5.
5. `Removable covers.' Penetrations through the top of removable sump covers shall be limited to those for the electrical supply, the vent piping and the discharge piping for the pump or pumps.
SPS 382.30(10)(b)1.1. `Where required.' The liquid from all sanitary building sumps shall be lifted and discharged into the building sanitary drain system by automatic ejectors, pumps or any other equally efficient method approved by the department.
SPS 382.30(10)(b)2.a.a. Duplex ejector or pumping equipment shall be installed in a public building where 3 or more water closets or more than 20 drainage fixture units discharge into a sump.
SPS 382.30(10)(b)2.b.
b. Duplex ejector or pumping equipment shall be installed where the sanitary wastes of 2 or more one- or 2-family dwellings discharge into a sump.
SPS 382.30(10)(b)2.c.
c. Where duplex ejector or pumping equipment is installed, appropriate devices shall be installed to automatically alternate operation of the pumps or ejectors and to operate both pumps or ejectors when one unit cannot handle the load.
SPS 382.30(10)(b)2.d.
d. Where duplex pumping equipment is installed, an audible or visual alarm system with a manual control reset shall be installed to indicate pump failure.
SPS 382.30(10)(b)3.
3. `Size.' The size and design of an ejector or pump shall be determined by the capacity of the sump to be served, the discharge head and discharge frequency. All ejectors and pumps shall provide a minimum flow velocity of 2 feet per second in the forced discharge piping.
SPS 382.30 Note
Note: See ch.
SPS 382 Appendix for velocity in relation to flow rate by various pipe sizes.
SPS 382.30 Note
Note: Ejectors or pumps discharging to septic tanks may disturb the normal settling properties of the tank environment; contact the Division of Industry Services for more information.
SPS 382.30(10)(b)3.a.
a. All sewage grinder pumps shall have a minimum 1
1/
4" diameter discharge opening and discharge piping.
SPS 382.30(10)(b)3.b.
b. All nongrinder-type sewage pumps serving water closets shall be capable of passing a 2" diameter solid ball and shall have a minimum 2
‶ diameter discharge opening and discharge piping. All other pumps handling sanitary wastes shall be rated by the manufacturer as an effluent pump, shall be capable of passing a
1/
2‶ diameter solid ball and shall have a minimum 1
1/
4" diameter discharge opening and discharge piping.
SPS 382.30(10)(b)4.a.a. The discharge pipe from the ejector or pump shall be connected to the gravity drain by means of a wye pattern fitting. Where the fitting connects to a horizontal drain, the bottom of the wye branch of the fitting shall be located above the horizontal center line.
SPS 382.30(10)(b)4.b.
b. With the exception of exterior sumps, a full flow check valve shall be installed in the discharge piping from each ejector or pump.
SPS 382.30(10)(b)4.c.
c. Where duplicate ejector or pumping equipment is installed, each discharge pipe from an ejector or pump shall be provided with a gate or ball type valve installed downstream of each full flow check valve.
SPS 382.30(10)(b)5.
5. `Discharge pipe air relief.' Air relief valves shall be provided at all high points in the discharge piping of an ejector or pump where the piping arrangement creates an air trap.
SPS 382.30(10)(b)6.
6. `Prohibited connections.' No fixtures may be connected to the discharge pipe between the ejector or pump and the point where it enters the gravity drain.
SPS 382.30(10)(b)7.
7. `Maintenance.' All ejectors, pumps and like appliances shall receive care as needed to keep them in a satisfactory operating condition.
SPS 382.30(10)(c)
(c) Prefabricated pump and sump systems. Macerating toilet systems and waste pumping systems for plumbing fixtures shall conform to ASME A112.3.4-2018/CSA B45.9-18. If unspecified by the manufacturer, the minimum capacity of a pump and sump system shall be determined in accordance with all of the following:
SPS 382.30(10)(c)1.
1. The water supply fixture unit, wsfu, method shall be used to determine peak input flow in gallons per minute. The peak input shall include all the fixtures that drain to the sump.
SPS 382.30(10)(c)2.
2. Unless storage is provided as specified in par.
(a) 2., the capacity of the prefabricated pump and sump system shall accommodate the peak input flow.
SPS 382.30(10)(c)3.
3. The low water level shall be maintained in accordance with the pump manufacturer's requirements.
SPS 382.30(10)(d)
(d) Exterior sumps. Exterior sumps shall comply with s.
SPS 384.25. The minimum capacity of exterior sumps shall be determined in accordance with all of the following:
SPS 382.30(10)(d)1.
1. Peak input flow in gallons per minute shall be determined in accordance with either of the following:
SPS 382.30(10)(d)1.a.
a. The water supply fixture unit, wsfu, method of all the fixtures that drain to the sump.
SPS 382.30(10)(d)2.
2. In lieu of providing the duplex pumping equipment as specified in par.
(b) 2., a one-day holding capacity may be provided above a high level alarm when installed on a simplex system.
SPS 382.30(11)(a)
(a) Limitations. No building sewer may pass through or under a building to serve another building, unless:
SPS 382.30(11)(a)1.
1. The building sewer serves farm buildings or farm houses, or both, which are all located on one property; or
SPS 382.30(11)(a)2.
2. The building sewer or private interceptor main sewer serves buildings located on the same property and a document, which indicates the piping and distribution arrangement for the property and buildings, shall be recorded with the register of deeds no later than 90 days after installation.
SPS 382.30(11)(b)1.a.a. All building drains shall be installed below the lowest floor levels on which fixtures may be installed if the public sewer, POWTs or private interceptor main sewer elevation permits.
SPS 382.30(11)(b)1.b.
b. Where any portion of an above-ground building drain discharges to a vertical pipe, the building drain shall connect to the building sewer at an elevation at least 30" above the basement floor.
SPS 382.30 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.30(11)(b)2.
2. `Backwater protection.' A building drain subject to backflow or backwater shall be protected with a backwater valve or with a sump with pumping equipment in accordance with sub.
(10).
SPS 382.30(11)(b)2.a.
a. Backwater valves, when fully open, shall have a capacity not less than that of the pipes in which installed.
SPS 382.30(11)(b)3.a.a. Where a plumbing fixture or appliance is located on a floor which is entirely below grade, a floor drain shall be installed to serve that floor.
SPS 382.30(11)(b)3.b.
b. In any room containing the recessed or concealed portions of sterilizers located in health care or related facilities, at least one floor drain connecting to the drainage system shall be installed in a manner to adequately drain the entire floor area.
SPS 382.30 Note
Note: See the pool code, s.
SPS 390.19 (2) for drain requirements for swimming pool toilet or locker rooms. “SPS 390.19 (2) DRAINAGE OF COVERED AREAS.
SPS 382.30 Note
(a) Floor drains shall be installed in toilet rooms and locker rooms where sanitary fixtures are located and where the room door is adjacent to the deck or adjacent to the impervious walkway draining to the deck.
SPS 382.30 Note
(b) Floor drain openings shall be 1/4 inch or less in width or diameter.
SPS 382.30 Note
(c) Floors shall be pitched to drain.”
SPS 382.30(11)(c)1.a.a. The top of a building sewer shall be located at a depth of not less than 42
‶ below finished grade, except as provided in subd.
1. b. or subd.
2. SPS 382.30(11)(c)1.b.
b. The top of a building sewer which discharges to a septic tank, holding tank or grease interceptor shall be located at a depth of not less than 18" below finished grade.
SPS 382.30(11)(c)2.a.a. Except as provided in subd.
2. c. to
e., a building sewer or private interceptor main sewer shall be protected from frost in accordance with subd.
3. in areas where the top of the building sewer or private interceptor main sewer is located less than 60" below a surface area from which snow will be cleared.
SPS 382.30(11)(c)2.b.
b. Except as provided in subd.
2. c. to
e., a building sewer or private interceptor main sewer shall be protected from frost in accordance with subd.
3. in areas where the top of the building sewer or private interceptor main sewer is located less than 42" below a surface area which snow will not be cleared.
SPS 382.30(11)(c)2.c.
c. Where a building sewer or private interceptor main sewer discharges to a holding tank, POWTs treatment tank or grease interceptor, the portion of a building sewer or private interceptor main sewer which is within 30 feet from the connecting building drain and which is under a surface area from which snow will not be cleared shall not be required to be protected from frost.
SPS 382.30(11)(c)2.d.
d. Frost protection for a building sewer shall not be required where the predicted depth of frost as determined from Figure 382.30-1 and Table 382.30-6 does not extend below the top of the building sewer.
SPS 382.30(11)(c)2.e.
e. Where a building sewer or private interceptor main sewer is installed to serve public facilities that are not open during the period from November 15 to March 15 and which are not places of employment, frost protection requirements shall not apply.
SPS 382.30(11)(c)3.
3. `Insulation for building sewers.' Where required by subd.
2. a. or
b., building sewer or private interceptor main sewer insulation for frost protection shall be provided in accordance with one of the methods specified in subd.
3. a. to
d. SPS 382.30(11)(c)3.a.
a. Extruded polystyrene foam insulation shall be installed at a depth of at least 18" below finished grade and at least 6" above the top of the sewer pipe. The minimum thickness and width of the foam insulation shall be determined from Figure 382.30-1 and Tables 382.30-5 to 382.30-7. If the insulation is to be installed more than 6" above the top of the sewer, the number of inches exceeding 6" shall be added to the width of insulation determined from Table 382.30-7.
SPS 382.30(11)(c)3.b.
b. Extruded polystyrene foam insulation shall be installed using a box method. The 3-sided box shall be formed with 3 lengths of polystyrene foam insulation where the top of the box extends horizontally to the farthest edge of both vertical sides. The insulation shall be installed at or below a depth of at least 12" below finished grade and 6" above the top and 6" from each side of the building sewer or private interceptor main sewer. The minimum thickness of the foam insulation shall be determined from Figure 382.30-1 and Table 382.30-5.
SPS 382.30 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.30(11)(c)3.c.
c. Lightweight insulating concrete shall be installed to the depth of the spring line of the sewer and shall extend laterally at least 6" on both sides of the sewer. The minimum thickness of the insulating concrete shall be determined from Figure 382.30-1 and Table 382.30-5. The thickness shall be measured from the top of the sewer. The top of the insulation shall be installed at least 12" below finished grade.
Figure 382.30-1. Frost protection zones.
SPS 382.30(11)(d)
(d) Location limitations. Building drains, building sewers or private interceptor main sewers shall be separated from water wells by the applicable separation distances contained in chs.
NR 811 and
812 or as otherwise approved by the department of natural resources.
SPS 382.30 Note
Note: See s.
SPS 382.40 for provisions regarding the separation of water supply piping, building sewers and private interceptor main sewers.
SPS 382.30 Note
Note: See ch.
SPS 382 Appendix for further explanatory material. Section
NR 812.08 may require additional setbacks.
SPS 382.30(11)(e)1.1. `Trenching.' All excavations for building drains and building sewers shall be open trench work, unless otherwise permitted by local ordinance or accepted by the local inspector.
SPS 382.30(11)(e)2.
2. `Stable bottom.' Where the bottom of the trench can be maintained in a stable condition and free of water during the time of installation the building drain and the building sewer shall be bedded and initially backfilled to comply with all the following requirements:
SPS 382.30(11)(e)2.a.
a. Where the trench bottom does not contain stone larger than one inch in size or where bedrock is not encountered, the trench may be excavated to grade.
SPS 382.30(11)(e)2.b.
b. Where stone larger than one inch size or when bedrock is encountered, the trench shall be excavated to a depth at least 3 inches below the grade elevation and shall be brought back to grade with a bedding of sand, gravel or crushed stone that shall be of a size that all the material shall pass a
¾-inch sieve.
SPS 382.30(11)(e)2.c.
c. Bedding shall be sufficiently dry and hand or mechanically compacted to a minimum of 90 percent standard proctor density.
SPS 382.30(11)(e)2.d.
d. Initial backfill to a depth of 12 inches over the pipe shall be sand, crushed stone or excavated material which is neither corrosive nor organic in nature.
