1. Each facility is solely responsible for the cost of the grease interceptor installation, inspection, cleaning and maintenance.

2. Gravity grease interceptor sizing and installation shall conform to the requirements contained in the current edition of the Uniform Plumbing Code (UPC) or other criteria as determined on a case-by-case basis based on review or relevant information, including, but not limited to grease interceptor performance, waste stream characteristics, facility location, maintenance needs, and/or inspection needs. Supporting sizing calculations shall be submitted to the governing agency.

3. Gravity grease interceptors shall be designed by a mechanical engineer using standard engineering principles for sedimentation and flotation in gravity separators. The grease interceptor shall have a minimum of 2 compartments with fittings designed for grease retention.

4. Gravity grease interceptors shall be installed at an outdoor location where it is easily accessible for sample collection, inspection, and cleaning and removal of retained grease. The grease interceptor may not be installed inside a building and the location must meet the approval of the governing agency.

5. Gravity grease interceptors shall be located in the lateral line between all fixtures which may introduce grease into the sanitary sewer and the connection to the sanitary sewer collection system. Such fixtures shall include but not be limited to sinks, dishwashers, floor drains for food preparation and storage areas, mop sinks, and any other fixture which is determined to be a potential source of grease.

6. Gravity grease interceptors must be vented.

7. Gravity grease interceptors shall be equipped with a sampling port at the outlet of the interceptor. Inspection tees and manholes must enable the utility to monitor and test the discharge for compliance with utility requirements or to allow monitoring and testing in accordance with the rules and regulations of other Federal, State or local agency having governmental or contractual jurisdiction within the utility service area.

8. Access manholes, with a minimum diameter of 24 inches, shall be provided over each chamber and sanitary tee. The access manholes shall extend at least to finished grade and be designed to prevent water inflow or infiltration. The manholes shall also have readily removable covers to facilitate inspection, cleaning and removal of retained grease and sample collection. Riser maximum shall not exceed 16 inches in the City of Issaquah.

9. Sanitary wastes shall not be introduced into the gravity grease interceptor.

1. Each facility is solely responsible for the cost of the HGI installation, inspection, cleaning and maintenance.

2. HGI sizing and installation shall conform to the requirements contained in the current edition of the Uniform Plumbing Code or other criteria as determined on a case-by-case basis based on review or relevant information, including, but not limited to grease trap performance, waste stream characteristics, facility location, maintenance needs, and/or inspection needs.

3. HGIs shall be designed using standard engineering principles by a licensed Washington State mechanical engineer for sedimentation and flotation in gravity separators. Complete plumbing plans and isometric or riser diagrams are required at time of plan check submittal. The plans must be stamped by the mechanical engineer of record.

4. HGIs shall be installed at a location where it is easily accessible for sample collection, inspection, and cleaning and removal of retained grease.

5. The HGI shall be equipped with a device to control the rate of flow through the unit. The rate of flow shall not exceed the manufacturer’s rated capacity recommended in gallons per minute for the unit.

6. Sanitary wastes cannot be introduced into the HGI.

1. Each facility is solely responsible for the cost of the oil/water separator installation, inspection, cleaning and maintenance.

2. Oil/water separator sizing and installation shall conform to the requirements contained in the current edition of the Uniform Plumbing Code (UPC) or other criteria as determined on a case-by-case basis based on review or relevant information, including, but not limited to separator performance, waste stream characteristics, facility location, maintenance needs, and/or inspection needs. The aforementioned determinations may or may not conform to the Uniform Plumbing Code construction standards or sizing criteria for oil/water separators or similar devices.

3. Oil/water separators shall be designed using standard engineering principles for sedimentation and flotation in gravity separators. The oil/water separator shall have a minimum of 2 compartments with fittings designed for grease, oil and retention. The minimum capacity guideline for an oil/water separator is to hold a maximum discharge flow for 45 minutes. The waste oil from the separator shall flow by gravity or shall be pumped to a higher elevation by an automatic pump.

4. Oil/water separators shall be installed at a location where they are easily accessible for sample collection, inspection, and cleaning and removal of retained grease. The oil/water separator may not be installed inside the building unless granted by the governing agency. The location must meet the approval of the governing agency.

5. Oil/water separators shall be located in the establishment’s lateral line between all fixtures and connected to all necessary floor drains which may introduce nonpolar grease or oil into the sanitary sewer and the connection to the sanitary sewer collection system.

6. Oil/water separators must be vented.

7. Oil/water separators shall be equipped with a sampling port at the outlet of the interceptor. Inspection tees and manholes must enable the utility to monitor and test the discharge for compliance with utility requirements or to allow monitoring and testing in accordance with the rules and regulations of other Federal, state or local agency having governmental or contractual jurisdiction within the utility service area.

8. Access manholes, with a minimum diameter of 24 inches, shall be provided over each chamber and sanitary tee. The access manholes shall extend at least to finished grade and be designed to prevent water inflow or infiltration. The manholes shall also have readily removable covers to facilitate inspection, cleaning and removal of retained grease and sample collection. Riser maximum shall not exceed 16 inches in the City of Issaquah. (Ord. 2716 § 2 (Exh. A1), 2014; Ord. 2612 § 2 (Exh. A1), 2011).