96.10 GREASE REMOVAL SYSTEM MAINTENANCE.
   The owner or lessee of every FSE required to install and use a Grease Removal Device shall, at its own expense, inspect, clean, and maintain the Grease Removal Device in efficient operating condition at all times.
      1.   Facilities with Grease Interceptors.
         A.   Unless otherwise specified by the pretreatment coordinator, each interceptor in active use shall be cleaned at least once every three months or when the total accumulation of surface FOG (including floating solids) and settled solids reaches twenty-five percent (25%) of the grease interceptor's overall liquid depth (25 Percent Rule), whichever comes first. The pretreatment coordinator may specify cleaning more frequently when quarterly pumping is shown to be inadequate. The pretreatment coordinator may change the required maintenance frequency to reflect changes in actual operating conditions. Any Food Service Establishment desiring a schedule less frequent than quarterly shall submit a request to the pretreatment coordinator along with the maintenance records for the last four (4) interceptor cleanings, including measurements of the thickness of the floating FOG and bottom solids layer, and volume removed.
         B.   A reduction in cleaning frequency may be granted by the pretreatment coordinator when it has been determined that the FOG interceptor has adequate detention time for FOG removal. The cleaning frequency will depend on variables such as the capacity of the device, the amount of grease in the wastewater, the amount of solids in the wastewater and degree of adherence to the FOG BMPs.
         C.   FSEs shall require the liquid waste hauler, transporter, or any other person cleaning or servicing an interceptor to completely evacuate all contents, including floating materials, wastewater, bottom solids, and grease during servicing. Skimming the surface layer of waste material, partial cleaning of the interceptor or use of any method that does not remove the entire contents of the collection device is prohibited. The suction of the floating materials shall be done prior to removal of other contents. After complete evacuation, the walls, top, and bottom of the interceptor shall then be thoroughly scraped and the residue removed. Upon completion of the servicing, the manager (of the Food Service Establishment) or his/her designated representative shall inspect the interior of the    interceptor and then document this servicing in the facility's Interceptor Maintenance Log. In the event that the interceptor is larger than the capacity of the vacuum truck, it shall be completely evacuated within a twenty four hour period.
         D.   The discharge of liquid, semi-solids, or solids back into an interceptor during and/or after servicing is prohibited. Decanting or discharging of any grease removal device wastes back into the grease removal device, any private sewer, any sewage drainage piping, or storm sewer system from which the waste was removed or any other grease removal device is prohibited.
      2.   Facilities with Grease Traps.
         A.   Greased traps shall be serviced at least weekly or when the amount of grease captured is at 50% of the trap's capacity, whichever is sooner. After the accumulated grease has been removed, the grease trap shall be thoroughly inspected to make certain that the inlet, outlet, and air relief ports are clear of obstructions.
         B.   A flow control device must be installed before each grease trap.
         C.   A dishwasher shall not be connected to a grease trap.
         D.   Grease traps must be regularly inspected for leaking seams, pipes, and flow control fitting(s) and repaired if necessary. Grease traps and their baffles shall be maintained free of all caked-on FOG and other waste. Removable baffles shall be removed and cleaned during the maintenance process.
         E.   Grease and other waste removed from the grease trap shall not be disposed.
      3.   Facilities with grease removal devices other than grease traps or grease interceptors must follow the manufacturer's recommendations for operation and maintenance.