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
1⁄
3 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
2⁄
3 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. Any new or replacement exterior grease interceptor shall have at least two compartments. 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 may not exceed 8 feet. Manhole openings shall be not less than 23 inches in the least dimension. Manholes shall terminate at or above ground surface and be of approved materials. Steel tanks shall have a minimum 2-inch 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 inches.
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.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.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
3⁄
4" 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)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 40
° F.
SPS 382.34(5)(d)7.
7. `Horizontal inlet requirements.' A maximum of 12 inches of horizontal inlet pipe may be submerged.
SPS 382.34(5)(d)8.
8. `Sizing calculations for greasy wok waste.' For calculating greasy waste for a wok, the following formula may be used:
diameter x diameter x .7854 x depth x .65 x .75
231
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,
1⁄
2" 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.
SPS 382.34(7)(c)1.1. In-line interceptors shall have a minimum inside diameter or horizontal dimension of 24".
SPS 382.34(7)(c)3.a.
a. The vent shall extend from above the flow line to a vent terminal in accordance with s.
SPS 382.31 (16) or shall be connected to the venting system serving the sanitary drain system.
SPS 382.34(7)(c)3.b.
b. The diameter of the vent shall be at least one-half of the diameter of the interceptor's outlet, but not less than 2".
SPS 382.34(7)(c)4.
4. The outlet for an in-line interceptor shall be at least 4
‶ in diameter. The outlet shall be submerged to form a trap with a water seal of at least 12". The bottom of the trap's water seal shall be at least 12" above the bottom of the interceptor.
SPS 382.34(7)(c)5.
5. The waterline in an in-line interceptor shall be at least 2" below the bottom of the inlet opening for the interceptor.
SPS 382.34(8)
(8)
Oil and flammable liquids. Oily and flammable wastewater that discharges to a building sewer shall be intercepted or treated by a means acceptable to the department.
SPS 382.34(8)(a)
(a) Site-constructed interceptors. Site-constructed interceptors shall be designed in accordance with the requirements in sub.
(4) (a) 2. SPS 382.34(8)(b)
(b) Prefabricated oil interceptors and separators. Prefabricated oil interceptors and separators shall be manufactured with adequate capacity for the anticipated load.
SPS 382.34(8)(c)
(c) Venting. Oil and flammable interceptors and separators shall be so designed to prevent the accumulation of explosive gases.
SPS 382.34(8)(c)1.
1. A covered interceptor or separator shall be provided with an individual vent of at least 3 inches in diameter. The vent shall extend from the top of the interceptor or separator or as high as possible, from the side of the interceptor or separator to a point at least 12 feet above grade.
SPS 382.34(8)(c)2.
2. The drain pipe to the interceptor or separator shall be provided with a fresh air inlet connected within 2 feet of the inlet of the interceptor or separator. The fresh air inlet shall terminate at least one foot above grade, but not less than 6 feet below the terminating elevation of the vent serving the interceptor or separator. The fresh air inlet shall be at least 3 inches in diameter.
SPS 382.34 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.34(9)
(9)
Bottling establishments. Wastes containing glass of bottling establishments shall be discharged through an interceptor.
SPS 382.34(10)
(10)
Dairy product processing plants. Dairy wastes from dairy product processing plants shall be discharged through an interceptor.
SPS 382.34(11)
(11)
Meat processing plants and slaughterhouses. The wastes from meat processing areas, slaughtering rooms and meat dressing rooms shall be discharged through an approved interceptor to prevent the discharge of feathers, entrails, blood and other materials.
SPS 382.34(12)
(12)
Sand interceptors. Sand interceptors and other similar interceptors for heavy solids shall be so designed and located as to be accessible for cleaning. The outlet for the interceptor shall be submerged to form a trap with a water seal of at least 12".
SPS 382.34(13)
(13)
Plaster and heavy solids trap type interceptors. Plaster sinks shall be provided with plaster and heavy solids trap type interceptors.
SPS 382.34(13)(b)
(b) The drain piping between the sink and the interceptor shall not exceed a length of 36".
SPS 382.34 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.34(14)
(14)
Chemical waste piping systems. All chemical wastes having a pH level of less than 5.5 or more than 10.0 shall discharge to a holding tank for proper disposal or to a drain system in accordance with this subsection.
SPS 382.34(14)(a)1.1. All chemical wastes discharging into a drain system shall be diluted, neutralized or treated to a pH level of 5.5 to 10.0 by passing through an approved dilution or neutralizing basin before discharging to a building sewer.
SPS 382.34(14)(a)2.
2. Dilution and neutralizing basins shall have the minimum retention capacities in accordance with one of the following requirements:
SPS 382.34(14)(a)2.b.
b. The minimum retention capacity shall be as per the manufacturer's specifications.
SPS 382.34(14)(a)2.c.
c. The minimum retention capacity for a quantity exceeding 150 sinks or for special uses or installations shall be approved by the department.
SPS 382.34(14)(a)3.
3. Where a sufficient supply of diluting water cannot be provided to a dilution or neutralizing basin, the basin shall be filled with marble or limestone chips of not less than one inch nor more than 3" in diameter to the level of the basin's outlet.
SPS 382.34(14)(b)
(b) Vents. Vents for chemical waste systems shall be sized and installed in accordance with all of the following:
SPS 382.34(14)(b)1.
1. Dilution and neutralizing basins with submerged inlets shall have a sanitary vent connected to the basin and a chemical waste vent connected to the inlet pipe. The pitch and the developed length of the drain between the submerged basin inlet and the chemical waste vent shall be in accordance with Table 382.31-1.
SPS 382.34(14)(b)2.
2. Dilution and neutralizing basins with submerged outlets shall have a chemical waste vent connected to the basin and a sanitary vent connected to the outlet pipe. The pitch and the developed length of the drain between the submerged basin outlet and the sanitary vent shall be in accordance with Table 382.31-1.
SPS 382.34 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.34(14)(b)3.
3. The vents for a chemical waste basin shall be sized based on the number of drainage fixture units discharging into the basin and installed in accordance with s.
SPS 382.31.
SPS 382.34(15)
(15)
Special wastewater or mixed wastewater treatment or containment devices. Mixed wastewater treatment and containment devices, decontamination tanks or other special wastewater treatment devices shall discharge to a dispersal or treatment system in accordance with this section or as approved by the department.
