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Plumbing systems for institutions or commercial establishments in which grease, fats, culinary oils or similar waste products from kitchens or food processing areas are wasted, or in which grease, fats or culinary oils are wasted in connection with utensil, vat, dish or floor cleaning processes shall include grease interceptors. All waste lines and drains carrying grease, fats or culinary oil in these establishments shall be directed to one or more interceptors. (See Appendix E.Illustrations A and B.)
  1. All required grease interceptors shall comply with the following:
    1. Material and Covers. Grease interceptors shall be constructed of durable, corrosion-resistant materials and shall have water-tight covers securely fastened in place.
    2. Minimum Size. A grease interceptor installed on the same floor as the fixture shall have one-half the liquid-holding capacity of the fixture. A grease interceptor located on a floor below the fixture shall have 60 percent of the liquid-holding capacity of the fixture. To determine the liquid-holding capacity in gallons of a plumbing fixture, the length is multiplied by the width by the height in inches and divided by 231. Where two or more sinks or receptacles are connected to an interceptor the liquid holding capacity shall be based on the combined volume of the fixtures served.
    3. No grease interceptor shall receive the discharge from a food waste disposal.
    4. The flow rate of the interceptor shall be sufficient to handle the maximum demand of the connected system.
    5. All interceptors shall be installed in an accessible location to permit the convenient removal of the lid and internal contents.
    6. All interceptors shall be designed and installed with proper venting so that they do not become air bound. (See Appendix E.Illustration C.)
  2. Prohibited Type. Water cooled grease interceptors are prohibited.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)
  1. Commercial vehicle repair garages, gasoline stations with grease racks or pits, and oil change facilities shall be provided with floor drains or trench drains connected to a gas and oil interceptor. If these facilities are connected to a private sewage disposal system, the floor or trench drains shall be connected to a holding tank in lieu of a gas and oil interceptor in accordance with the Private Sewage Disposal Licensing Act. Where trench drains are used to carry wastes to a gas and oil interceptor, the trench drain shall either extend the entire length of the work area or shall be installed in each working stall. For all facilities specified in this Section in which floor drains are installed, a minimum of one floor drain per working stall or one floor drain for each 500 square feet shall be installed.
  2. Commercial and residential vehicle storage areas greater than 1,000 square feet with floor or trench drains installed shall comply with subsection (c)(1), (2) or (3). Exception: residential garages with fewer than five vehicle bays are exempted from this requirement.
  3. All facilities, other than those specified in subsection (a), that generate fuel, oil or flammable waste shall meet one of the following requirements:
    1. provide floor drains or trench drains connected to a gas and oil interceptor.
    2. provide floor or trench drains connected to a holding tank in lieu of a gas and oil interceptor when these drains are connected to a private sewage disposal system.
    3. provide an alternative system approved by the Department (i.e., an oil reclamation system or containment area).
  4. General Requirements
    1. Gas and oil interceptors shall be of cast iron, steel, polyethylene, polymer concrete or equally durable fiberglass materials suitable for gas and oil. Fiberglass interceptors shall not be used for receiving any substance other than gas and oil. Poured concrete interceptors are prohibited.
    2. Each gas and oil interceptor or basin shall be provided with a heavy metal cover, which shall be bolted into place and made gas and -water-tight.
    3. Each gas and oil interceptor and, if provided with separate compartments, each compartment and basin shall be provided with a vent of at least 2 inches, which shall extend independently to the outer air. Two or more vents may be connected to a header, which shall be 6 inches or higher than the lowest floor or trench drain served.
    4. The inlet of the gas and oil interceptor or the first basin shall be trapped except when floor drains are individually trapped.
    5. Floor drains above the level of the gas and oil interceptor or basins shall connect to a stack vent extending independently to the outer air.
    6. Gas and oil interceptors must be constructed in accordance with the Illinois State Fire Marshal's rules and regulations for underground storage tanks (41 Ill. Adm. Code 174, 175, 176, 177), when applicable, and shall be maintained to prevent loss of gas, oil, etc. Gas and oil interceptors using an automatic draw off feature shall have a separate U.L. approved underground storage tank or storage tank installed integral with the interceptor.
    7. Minimum Dimension. Gas and oil interceptors shall have a depth of at least 2 feet below the invert of the discharge drain.
    8. Performance. The gas and oil interceptor shall have at least a 12-inch water seal with a minimum 90 percent efficiency rating or have a minimum of an 18-inch water seal. Gas and oil in the effluent from the gas and oil interceptor or triple basin shall not exceed the levels specified by the sewage treatment authority having jurisdiction, in accordance with local ordinances and regulations.
    9. Poured concrete trench drains are prohibited for gas and oil discharges.
  5. Aircraft hangars used exclusively for storing aircraft shall be exempt from this Section under the following conditions:
    1. No operation of aircraft or maintenance of any kind, including, but not limited to, mechanical work upon an aircraft, or aircraft fueling, oiling, lubricating or washing, may be performed in the hangar.
    2. Oil, gasoline or flammable materials of any kind shall not be stored in the hanger.
    3. The hangar shall not be provided with floor drains or trench drains.
    4. The hangar shall not contain drains of any kind that are connected to a public sewer/private sewage disposal system/holding tank.
    5. In lieu of the requirements of subsections (e)(1) through (4), aircraft storage hangars may install floor drains or trench drains that comply with the requirements of subsections (a) through (e).
  6. Sizing
    1. The minimum size interceptor for all facilities required to comply with subsection (a) shall be 6 cubic feet (45 gallons) for the first 500 square feet of floor area plus 1 cubic foot per each additional 500 square feet to be drained into the interceptor.
    2. The minimum size interceptor for all facilities, except those facilities required to comply with subsection (a), shall be 6 cubic feet (45 gallons) for the first 3,000 gross square feet plus 1 cubic foot per each additional 1,000 square feet to be drained into the interceptor. Floor area for parking decks or garages shall be determined by the gross square feet of the parking spaces.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)
  1. Catch Basins. In all motor vehicle wash racks, drainage shall discharge into a water-tight catch basin at least 36 inches in diameter, or 3 feet by 21/2 feet (rectangular shape). The bottom shall not be less than 27 inches below the invert of the outlet pipe. The outlet pipe shall be trapped with a catch basin trap and shall be constructed of cast iron or schedule 40 plastic with a trapseal of at least 6 inches and a cleanout of at least 4 inches in diameter.
  2. Commercial laundries shall be equipped with an interceptor having a removable wire basket or similar device that will prevent materials detrimental to the sewage system from passing into the system.
  3. Sand, bottle and slaughter houses that will produce wastes that either settle or float (Example: oil or grease from meat packing operations, bottling establishments or heavy solids.) shall have an interceptor installed that complies with Section 890.510(a).
  4. Interceptor for Special Waste. Before installing any interceptor for any other flammable or special wastes, a drawing including all pertinent information shall be submitted to the Department for approval.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)
(Source: Repealed at 28 Ill. Reg. 4215, effective February 18, 2004)
(Source: Repealed at 28 Ill. Reg. 4215, effective February 18, 2004)
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