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SPS 382.34(4)(a)2.f. f. The basin shall be provided with a cover at least 23 inches square or 23 inches in diameter.
SPS 382.34(4)(a)2.g. g. Gravity drains from fixtures serving garage floor areas located on different floors from the basin may discharge into the basin if the drain stack carrying the wastewater is located at a distance equal to at least 20 times the inside diameter of the horizontal piping upstream of the basin.
SPS 382.34(4)(a)2.h. h. Catch basins with solid covers shall be vented in accordance with sub. (8) (c).
SPS 382.34(4)(a)3. 3. Drains with traps may connect to the garage catch basin under all of the following conditions:
SPS 382.34(4)(a)3.a. a. The trap shall be a minimum of 3" in diameter.
SPS 382.34(4)(a)3.b. b. Except as provided in subd. 3. c., the developed length from all trap outlets to the basin shall not exceed the distance as specified in Table 382.31-1.
SPS 382.34(4)(a)3.c. c. Where the maximum distance exceeds that as specified in Table 382.31-1, the trap shall be vented in accordance with s. SPS 382.31 (3) and the connection to the basin shall form a 6-inch trap seal. The trap seal may be constructed on either the interior or exterior of the basin, but within 36" of the basin.
SPS 382.34(4)(a)4. 4. Drains without traps may discharge into a garage catch basin under all of the following conditions:
SPS 382.34(4)(a)4.a. a. The fixture drain shall have a minimum 4-inch inside diameter.
SPS 382.34(4)(a)4.b. b. The fixture drain shall be piped with a 6-inch water seal constructed either on the interior or exterior of the basin.
SPS 382.34(4)(a)4.c. c. An exterior trap shall be constructed within 36" of the basin.
SPS 382.34(4)(a)4.d. d. The developed length of the fixture drain shall not exceed the distance equal to 24 times the diameter of the fixture drain.
SPS 382.34(4)(a)4.e. e. Fixture drains shall individually discharge into a garage catch basin.
SPS 382.34(4)(a)5. 5. Pressurized drains from garage floor areas discharging to a garage catch basin shall conform to all of the following conditions:
SPS 382.34(4)(a)5.a. a. The pressurized drain piping shall terminate inside the basin with a 6-inch submerged inlet. The termination shall be at least 12" above the floor of the basin.
SPS 382.34(4)(a)5.b. b. The pressurized equipment, devices and piping shall be designed and installed to produce a maximum velocity of 2 feet per second at the point of connection to the basin.
SPS 382.34 Note Note: Plans for garage floor discharge-holding tanks may require plan approval by the department of natural resources.
SPS 382.34(4)(b) (b) Garages for one- and 2-family dwellings.
SPS 382.34(4)(b)1.1. Floor drains serving garages for one- and 2-family dwellings shall be provided with a solid bottom sediment basket.
SPS 382.34 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.34(4)(b)2.a.a. Except as permitted in subd. 2. b., catch basins serving garages for one- and 2-family dwellings shall be designed and installed in accordance with par. (a) 2.
SPS 382.34(4)(b)2.b. b. The minimum inside diameter of catch basins serving garages for one- and 2-family dwellings shall be 18 inches.
SPS 382.34(4)(c) (c) Grates for garage catch basins, floor drains and trenches. A garage catch basin, floor drain and trench drain shall be provided with an approved, removable cast iron or steel grate of a thickness and strength for the anticipated loads. The grate shall have an available inlet area equal to at least the outlet drain for the catch basin, floor drain or trench drain.
SPS 382.34 Note Note: Residential exclusion see s. SPS 325.01 (4) (c).
SPS 382.34(5) (5)Grease and oil treatment.
SPS 382.34(5)(a)(a) All plumbing installations for occupancies, other than dwelling units, where grease, fats, oils or similar waste products of cooking or food are introduced into the drain system shall be provided with grease and oil treatment in accordance with this subsection.
SPS 382.34(5)(b) (b) General.
SPS 382.34(5)(b)1.1. `Public sewers.' All new, altered or remodeled plumbing systems which discharge to public sewers shall be provided with one or more grease interceptors.
SPS 382.34(5)(b)1.a. a. Where one or more exterior grease interceptors are provided all, and only, kitchen wastes shall be discharged to an exterior interceptor.
SPS 382.34(5)(b)1.b. b. Except as required in subd. 1. c. or d., where one or more interior grease interceptors are provided the wastes from a food waste grinder, a sanitizing compartment of a sink or a rinse compartment of a sink, may bypass the interceptor or interceptors.
SPS 382.34(5)(b)1.c. c. The wash compartment of a scullery sink shall discharge through a grease interceptor.
SPS 382.34(5)(b)1.d. d. The pre-wash compartment not discharging through a garbage disposal shall discharge through a grease interceptor.
SPS 382.34(5)(b)2. 2. `Private onsite wastewater treatment systems.' All new, altered or remodeled plumbing systems which discharge to private onsite wastewater treatment systems shall be provided with exterior grease interceptors.
SPS 382.34(5)(b)2.a. a. Except as provided in subd. 2. b., only kitchen and food wastes shall be discharged to an exterior grease interceptor.
SPS 382.34(5)(b)2.b. b. For remodeling, when it is not practicable to separate kitchen and toilet wastes, combined kitchen wastes and toilet wastes may be discharged directly to a private onsite wastewater treatment component tank or tanks which conform to par. (c). The required capacity of a grease interceptor shall be added to the required septic tank capacity as specified in ch. SPS 383.
SPS 382.34(5)(b)2.c. c. For holding tank installations, the combined kitchen and toilet wastes may discharge directly to a holding tank where the location accepting the pumpage from the tank provides written acceptance of the combined waste to the department.
SPS 382.34(5)(b)3. 3. `Existing installations.' The department may require the installation of any treatment device deemed necessary by the department for existing plumbing installations where the waterway of a drain system, sewer system or private onsite wastewater treatment system is reduced or filled due to grease.
SPS 382.34(5)(c) (c) Exterior grease interceptors. Exterior grease interceptors shall receive the entire waste discharge from kitchens or food processing areas. All exterior interceptors shall be designed and constructed in accordance with this paragraph, so as to constitute an individual structure.
SPS 382.34(5)(c)1. 1. `Design.'
SPS 382.34(5)(c)1.a.a. The liquid depth of the interceptor shall not be less than 42" nor more than an average of 72".
SPS 382.34(5)(c)1.b. b. A rectangular interceptor tank shall have a minimum width of 36 and a minimum length of 72". The longest dimension of the tank shall be parallel to the direction of waste flow.
SPS 382.34(5)(c)1.c. c. A horizontal-cylindrical interceptor tank shall have a minimum inside diameter of 52" and a minimum length of 72". The longest dimension of the tank shall be parallel to the direction of waste flow.
SPS 382.34(5)(c)1.d. d. Vertical-cylindrical interceptor tanks shall have a minimum inside diameter of 72".
SPS 382.34(5)(c)1.e. e. Each prefabricated interceptor tank shall be clearly marked to indicate liquid capacity and the name and address or registered trademark of the manufacturer. The markings shall be impressed into or embossed onto the outside wall of the tank immediately above the outlet opening. Each site-constructed concrete tank shall be clearly marked at the outlet opening to indicate the liquid capacity. The marking shall be impressed into or embossed onto the outside wall of the tank immediately above the outlet opening.
SPS 382.34(5)(c)1.f. f. The inlet and outlet openings of interceptor tanks or tank compartments shall be provided with, open-end sanitary tee fittings or baffles, so designed and constructed as to distribute the flow and retain the grease in the tank or tank compartments. The sanitary tee fittings or baffles shall extend at least 6" above the liquid level. At least 2" of clear space shall be provided above the top of the sanitary tee fittings or baffles. The sanitary tee fitting or baffle at the inlet opening shall extend below the liquid level of the tank a distance equal to 13 of the total liquid depth. The sanitary tee fitting or baffle at the outlet opening shall extend below the liquid level of the tank a distance equal to 23 of the total liquid depth. The waterline in the interceptor shall be at least 2" below the horizontal drain discharging to the interceptor.
SPS 382.34(5)(c)1.g. g. Each compartment of an interceptor tank shall be provided with at least one manhole opening located over either the inlet or outlet opening. Additional manhole openings shall be provided such that no interior compartment wall of a tank is more than 4 feet from the edge of the manhole opening. The distance between manhole openings serving the same compartment shall not exceed 8 feet. Manhole openings shall be not less than 23" in the least dimension. Manholes shall terminate at or above ground surface and be of approved materials. Steel tanks shall have a minimum 2" collar for the manhole extensions permanently welded to the tank. The manhole extension on fiberglass tanks shall be of the same material as the tank and an integral part of the tank. The collar shall have a minimum height of 2".
SPS 382.34(5)(c)1.h. h. Manhole risers for interceptor tanks shall be provided with a substantial, fitted, watertight cover of concrete, steel, cast iron or other approved material. Manhole covers shall terminate at or above grade and shall have an approved locking device.
SPS 382.34(5)(c)1.i. i. A minimum 4 × 6 inch permanent label shall be affixed to the manhole cover, identifying the interceptor tank with the words GREASE INTERCEPTOR. Where the tank acts as the septic tank and grease interceptor the label shall identify it as such. The wording used on the warning label shall be approved by the department, as part of the materials approval for the tank under ch. SPS 384.
SPS 382.34(5)(c)1.j. j. An inlet or outlet opening which does not have a manhole opening as specified in subd. 1. g. shall be provided with an airtight inspection opening located over the inlet or outlet. The inspection opening shall be at least 4" in diameter. The inspection opening shall terminate at or above grade.
SPS 382.34 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.34(5)(c)2. 2. `Capacity and sizing.' The minimum liquid capacity of a grease interceptor shall be determined in accordance with the provisions of this subdivision, except no grease interceptor may have a capacity of less than 1000 gallons if the interceptor is to discharge to a private onsite wastewater treatment system or less than 750 gallons if the interceptor is to discharge to a municipal sewer system and treatment facility.
SPS 382.34(5)(c)2.a. a. The minimum capacity of a grease interceptor serving a restaurant with seating shall be equal to C, where
SPS 382.34(5)(c)2.b. b. The minimum capacity of a grease interceptor serving a dining hall, hospital, nursing home, school kitchen, church kitchen or a kitchen for carryout or delivery service shall be equal to C, where: - See PDF for diagram PDF - See PDF for table PDF
SPS 382.34(5)(c)2.c. c. The minimum capacity of a grease interceptor as determined in subd. 2. a. or b. may be halved for establishments with all paper service, but may not be less than 1000 gallons if the interceptor is to discharge to a private sewage system or less than 750 gallons if the interceptor is to discharge to a municipal sewer system and treatment facility.
SPS 382.34(5)(c)3. 3. `Installation.'
SPS 382.34(5)(c)3.a.a. Grease interceptor tanks may not be located within 5 feet of a building or any portion of the building or swimming pool; 10 feet of a water service; 2 feet of a lot line; 10 feet of a cistern or 10 feet of a reservoir or high water mark of a lake, stream, pond or flowage.
SPS 382.34 Note Note: The department of natural resources under chs. NR 811 and 812 may require additional setbacks. See ch. SPS 382 Appendix for further explanatory material.
SPS 382.34(5)(c)3.b. b. Where a grease interceptor tank is installed in groundwater, the tank shall be adequately anchored.
SPS 382.34(5)(c)3.c. c. Grease interceptor tanks shall be installed on a bedding of at least 3 in depth. The bedding material shall be sand, gravel, granite, limerock or other noncorrosive materials of a size that all will pass through a 34" sieve.
SPS 382.34(5)(c)3.d. d. The backfill material for steel and fiberglass grease interceptor tanks shall be as specified in subd. 3. c. for bedding and shall be tamped into place. The backfill material for concrete grease interceptor tanks shall be soil material, of a size that will pass through a 4 inch screen and shall be tamped into place.
SPS 382.34(5)(c)3.e. e. All joints on concrete risers and manhole covers for a grease interceptor shall be tongue and groove or shiplap type and sealed watertight using neat cement, mortar or bituminous compound. All joints on steel risers for a grease interceptor shall be welded or flanged and bolted and be watertight. All steel manhole extensions from a grease interceptor shall be bituminous coated inside and outside. All methods of attaching fiberglass risers for a grease interceptor shall be watertight and approved by the department.
SPS 382.34 Note Note: See ch. SPS 382 Appendix A-382.30 (11) (d) for material reprinted from s. NR 812.08. Section NR 812.08 may have additional setback requirements to wells.
SPS 382.34(5)(d) (d) Interior grease interceptors.
SPS 382.34(5)(d)1.1. `Flow rating.' An interior grease interceptor shall be capable of accommodating a flow of at least 15 gallons per minute, but not less than the manufacturer's specifications.
SPS 382.34(5)(d)2. 2. `Flow rate related to connected capacity.' Three-fourths of the total holding capacity in gallons of all fixtures and devices discharging to an interior grease interceptor, shall not exceed the value of the maximum flow rate which the interceptor can accommodate.
SPS 382.34(5)(d)3. 3. `Grease holding capacity as related to flow rate.' The grease holding capacity in pounds shall not be less than double the value of the maximum flow rate which the interceptor can accommodate.
SPS 382.34(5)(d)4. 4. `Flow controls.' Where required by the manufacturer, devices which control the rate of flow through an interior grease intercept shall be installed.
SPS 382.34(5)(d)4.a. a. The flow control devices shall be accessible for inspection, service and cleaning.
SPS 382.34(5)(d)4.b. b. Flow controls shall be installed in the drain branch leading to each fixture and shall be so rated that the combined flow from all combinations of discharge will not develop either sufficient static or velocity head so the established flow rate of the interceptor can be exceeded.
SPS 382.34 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.34(5)(d)5. 5. `Flow control vents.' Orifice type flow controls for an interior grease interceptor shall be vented in accordance with s. SPS 382.31.
SPS 382.34(5)(d)6. 6. `Prohibited locations and types.' No water-cooled grease interceptor may be installed. No grease interceptor may be located where the surrounding temperatures, under operating conditions, are less than 40º F.
SPS 382.34(5)(d)7. 7. A maximum of 12 inches of horizontal inlet pipe may be submerged.
SPS 382.34(5)(e) (e) Prohibited treatment. The introduction of grease or fat emulsifiers into a grease interceptor shall be prohibited.
SPS 382.34(6) (6)Automatic car washes. The wastes of floor drains and drain inlets of automatic car washes shall discharge through an approved car wash interceptor.
SPS 382.34(6)(a) (a) Design. Except as provided in subds. 1. and 2. and par. (b), car wash interceptors shall be constructed and installed in accordance with sub. (4) (a) 2.
SPS 382.34(6)(a)1. 1. The interceptor's outlet shall be submerged to form a trap with a water seal of at least 15".
SPS 382.34(6)(a)2. 2. The bottom of the trap's water seal shall be at least 30" above the bottom of the interceptor.
SPS 382.34(6)(b) (b) Capacity. The minimum liquid capacity of the interceptor shall be based on the maximum flow rate of water through the interceptor in gallons per minute.
SPS 382.34(6)(b)1. 1. Between the waterline and the bottom of the trap seal of the outlet, the interceptor shall have a capacity value equal to at least 5 times the maximum flow rate.
SPS 382.34(6)(b)2. 2. Below the bottom of the trap seal of the outlet, the interceptor shall have a capacity value equal to at least 15 times the maximum flow rate.
SPS 382.34 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.34(6)(c) (c) Hand-held car washing wands. The wastes of floor drains and drain inlets serving 2 or more hand-held car washing wands shall discharge through an approved car wash interceptor. The wastes of one hand-held car washing wand may discharge to a garage catch basin.
SPS 382.34(7) (7)Commercial laundries. Wastes from gravity dump-type clothes washing equipment shall be discharged through an approved laundry interceptor in accordance with this subsection.
SPS 382.34(7)(a) (a) Screening apparatus. A laundry interceptor shall be equipped with a wire basket or other device which will prevent the passage of solids, 12" or larger in diameter, string, buttons and other detrimental materials into the drain system.
SPS 382.34(7)(b) (b) Trench type interceptors. A floor receptor, trench or trough as specified in s. SPS 382.33 (9) (c) 3., may serve as a laundry interceptor, if no oils or quantities of sand are discharged into it.
SPS 382.34 Note Note: See ch. SPS 382 Appendix for further explanatory material.
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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.