A. Grease And Interceptors - Food Service Establishments (FSE): Hydro- mechanical grease interceptors and gravity grease interceptors (collectively referred to as grease interceptors or GI) are required to be installed in all new FSE. The building department (BD) may require GI to be installed or modified in existing FSE where FSE that have caused or contributed to overflows and/or blockages, or at existing FSE that meet the remodeling requirements identified in section 8-2-3-9 or when streetscapes or street/sewer replacements are installed.
1. Installation Requirements:
a. All newly constructed FSE's shall install an exterior GI prior to operation of the facility.
b. Common interceptors are required to be installed when the tenants or purchasers of sub-properties that are unknown by the complex owner and zoning allows the build-out of an FSE in said properties. The owner of the property on which the common interceptor is located shall be primarily responsible for the maintenance, upkeep, and repair of the common interceptor.
c. Existing FSE: All existing FSE's may be required to install a GI at the request of the BD. The BD may require a GI to be installed or modified in an existing FSE within ninety (90) calendar days of notification by the village where the FSE has caused or contributed to overflows and/or blockages, when any reconstruction, rebuilding, or remodeling of fifty percent (50%) or more of the building occurs, or when streetscapes or street/sewer replacements are installed. The BD may require a new GI to be installed when the facility has an undersized, irreparable, or defective GI. In the event that winter weather will impact the installation of a GI, the BD may grant an extension of the installation schedule to a maximum of one hundred eighty (180) calendar days.
d. Existing FSE Where Hot Spots Or Blockages Have Occurred: GI's will be required to be installed within ninety (90) calendar days of a notice by the village if hot spots or blockages have occurred. GI's interior to the building may be required as an interim measure to the installation of an exterior GI. Such GI will be required to be installed within from five (5) to thirty (30) calendar days, as determined by the BD based upon the nature of the hot spot or blockage, after a notice by the village.
e. Waivers for installations at establishments only serving beverages and snack bars with no food preparation other than food warming will be handled on a case-by-case basis by the BD.
2. Location: All GI shall be so located to be easily accessible for cleaning and inspection. All GI will be provided exterior to the building for all new construction and when feasible at existing FSE. The GI shall not be located in drive-through lanes.
4. Sign-Off Inspection: Prior to the initial operation of any FSE, the GI shall be inspected by the village and a sign-off will be issued by the village. Notification will be made by the FSE to the BD during normal business hours of the village. Inspections will be made normally by the village within two (2) village business days of the notice. The FSE will be required to make appropriate changes prior to initial operation, in the event that the GI does not meet requirements.
5. Maintenance: Such GIs shall be inspected, the grease cap and solids blanket cleaned every three (3) months, the entire contents of the trap cleaned annually and repaired regularly, as needed, by the owner at his expense. It shall be the responsibility of the FSE to inspect its GI during the pumping procedure to ensure the trap is properly cleaned out and that all fittings and fixtures inside the trap are in working condition and functioning properly. In the event that actual operations of the GI fail to produce results that consistently prevent prohibitive discharges as defined in section 8-2-5-2 and/or meet the local limits in section 8-2A-2-1, the owner of the FSE will be required by the BD to have the GI cleaned at a more frequent rate or install additional pretreatment as necessary.
6. Modifications: The BD may make determinations of GI adequacy, need, design, appropriateness, application, location, modification(s), and conditional usage based on review of all relevant information regarding GI performance, facility site and building plan review by all regulatory reviewing agencies and may require repairs to, or modification or replacement of the GI.
B. Grease Interceptor Sizing Criteria: All GIs shall be of a type and capacity approved by the BD based on an evaluation of the volume and characteristics of the discharge in conjunction with the operating plan of the FSE. Each GI will be sized so that it will continuously produce an effluent that conforms with the local limits identified in section 8-2A-2-1. GI installed at new and existing FSE must meet the following criteria:
1. The size will be determined by a formula approved by the village. The minimum capacity of any individual FSE unit shall be five hundred (500) gallons and the maximum capacity shall be one thousand five hundred (1,500) gallons. Common interceptors may be required to be sized larger. Where sufficient capacity cannot be achieved with a single unit, installation of GI in series is required.
2. Twenty Five Percent (25%) Requirement: Provide for a minimum hydraulic retention time of twenty four (24) minutes at actual peak flow between the influent and effluent baffles, with twenty five percent (25%) of the total volume of the exterior gravity GI being allowed for any food derived solids to settle or accumulate and floatable grease-derived materials to rise and accumulate, identified as a solids blanket and grease cap respectively.
3. Access Manholes: Access manholes, with a minimum diameter of twenty four inches (24"), shall be provided over each exterior gravity GI chamber and each sanitary tee. The access manholes shall extend at least to finished grade and be designed to and maintained to prevent water inflow or infiltration. The manholes shall also have readily removable covers to facilitate inspection, grease removal, and wastewater sampling activities.
4. Prohibitions: Food waste disposal units shall not be connected to or discharged into any GI. Dishwashers whose discharge has not been tempered to less than one hundred fifty degrees Fahrenheit (150°F) are prohibited to be discharged into any GI.
C. Waivers that are available to FSE are identified below. A request for a waiver is required to be filed with the BD on a form provided by the village and a waiver review fee will be required at the time of the filing as defined in section 8-2C-3. Waiver requests are not considered to be filed until the request has been reviewed and determined complete. If the BD fails to act on a completed waiver request within forty five (45) calendar days, a request for waiver shall be deemed to be denied. While waivers may result in an alteration of the GI requirements, it does not waive the requirement to prevent prohibitive discharges through alternate technologies and best management plan practices.
1. Existing External FSE GI Installation Waiver: The requirement to install and to properly operate and maintain a GI is conditionally stayed, that is, delayed in its implementation by the BD. Terms and conditions for application of a stay to a FSE shall be set forth in a permit. The terms may include the requirement to install GI(s) inside the facility, alternate technology and the use of best management practices. The waiver will not apply to any existing facility that has not operated as a FSE for the last twelve (12) consecutive months prior to the adoption of this chapter. Such facilities will be required to install a GI in order to operate a FSE in the village sanitary sewer service area.
2. Common GI Waiver: Common GI means one or more interceptors receiving FOG laden wastewater from more than one establishment. Common interceptors may be used in lieu individual GI at each FSE provided a waiver has been granted by the BD. A common GI may be located at shopping centers, malls, entertainment complexes, sporting arenas, hotels, multi-tenant "flex" spaces, mixed use spaces, and other sites where multiple establishments are connected to a single GI. The owner of the property on which the common grease interceptor is located shall be responsible for operating and maintenance of the common interceptor including program documentation, upkeep, and repair. In such cases, a permit will be issued to the property owner for the GI and general permits will also be required at each FSE for best management practices requirements.
3. Limited Food Preparation Establishments GI Installation Waiver: Waivers for installations at FSE only serving beverages and snack bars with no food preparation other than food warming will be handled on a case-by-case basis by the BD and are deemed to be limited food preparation establishments.
4. Constraint Waivers At Existing FSE: Where the installation of a GI is not feasible and no equivalent alternative pretreatment can be installed, a waiver from the installation of the GI requirement may be granted. The BD determination to grant the waiver will be based upon, but not limited to, evaluation of the following conditions:
a. There is no adequate space for installation and/or maintenance of a grease interceptor;
b. There is no adequate slope for gravity flow between the kitchen plumbing fixtures and the GI and/or between the GI and the private collection lines or public sewer; or
c. A waiver from GI installation cannot be granted to allow alternative pretreatment technology that is, at least, equally effective in controlling the FOG discharge in lieu of a GI.
If a constraint waiver is granted, the DPW will institute the grease disposal mitigation fee as defined in section 8-2C-2-3.
5. Alternate Technology Waiver: The use of automatic grease removal systems is permissible only upon the written approval of the BD, and the lead plumbing inspector of the village. Approval of the device shall be based on demonstrated (proven) removal efficiencies and reliability of operation. The village may approve these types of devices dependent on manufacturer's specifications on a case-by-case basis. Any user operating an alternative technology may be subject to additional operational requirements. Any user with this equipment shall operate the system in such a manner that attainment of the grease wastewater discharge limit, as measured from the unit's outlet, is consistent achieved as required by the DPW.
6. Cleaning Cycle Waiver: The property may petition the BD to reduce the cleaning and servicing of the GI from every three (3) months to a maximum of every six (6) months upon demonstration that the amount removed every three (3) months is significantly less than twenty five percent (25%) rule for the basin capacity and the discharge does not exceed the oil and grease local limit in section 8-2A-2-1. (Ord. 20-08-25, 8-10-2020)