1. Unless otherwise specified by the supervisor, each interceptor (GGI/HGI) in active use shall be cleaned as specified in the individual operational permit. Each GGI/HGI is reviewed on a case-by-case basis. The frequency may increase or decrease depending upon the need to prevent carry over of grease into the POTW. The supervisor may specify cleaning more frequently when the current pumping schedule is shown to be inadequate. Additional pumping may be required during time periods where increased loading is anticipated. Any grease generator desiring a schedule less frequent than established shall submit a request to the supervisor along with testing (as required by the supervisor) and copies of the cleaning records for the last four interceptor (GGI/HGI) cleanings, including measurements of the thickness of the surface scum/grease layer and sediment.

2. At any time if an inspection finds the interceptor (GGI/HGI) having solids occupying 25 percent or more of the interceptor’s liquid capacity, immediate steps shall be taken by the grease generator to pump out and clean the interceptor. The inspector shall make an evaluation of the advisability of allowing discharge to continue, and may at his or her discretion order an immediate cessation of all discharge from the facility. In any case, the grease interceptor operational permit of the facility may be amended so as to compel more frequent pumping and cleaning of the interceptor (GGI/HGI).

1. Every generator having a GGI or HGI shall maintain a gravity grease interceptor/hydromechanical grease interceptor maintenance log indicating each pumping or cleaning for the previous 12 months. This log shall include the date, time, amount pumped (removed), hauler and disposal site, and shall be kept in a conspicuous location on the premises of the facility for inspection. Food service establishments shall keep the log posted. Said log shall be made immediately available to any authorized city inspector.

2. A copy of the information required in the maintenance log must be available to the inspector at the time of inspection to be removed and become the city’s record. The inspection period shall run from January 1st through December 31st of each year. Regular inspections will occur twice yearly, or as required by the operational permit. Repeat inspections for those interceptors (GGIs/HGIs) not meeting maintenance requirements will be done 30 days from initial inspection.

1. The owner or an employee of the facility shall supervise the interceptor (GGI/HGI) cleaning, and shall be physically present and observe the entire cleaning operation and sign the maintenance log as proof.

2. A generator shall cause the liquid waste hauler, transporter, or any other person cleaning or servicing an interceptor (GGI/HGI) to completely evacuate all contents, including grease, floating materials, wastewater, and bottom sludges and solids. Skimming the surface layer of waste material and other partial cleaning of the interceptor (GGI/HGI) or use of any method that does not remove the entire contents of the collection device is prohibited. Removal of the floating materials shall be done prior to removal of other contents. After complete evacuation, the walls, top, and bottom of the interceptor (GGI/HGI) shall then be thoroughly cleaned and the residue removed. Upon completion of the servicing, the manager or their designee of the facility shall make an inspection of the interior of the interceptor (GGI/HGI) and then personally sign the trip ticket. In the case of an HGI, an entry on the maintenance log shall serve as the trip ticket. The manager or their designee shall make an appropriate entry in the facility interceptor maintenance log, and leave a copy of the trip ticket with the log for the inspector to pick up at the next inspection. Food service establishments shall keep all trip tickets posted with their Pierce County health food permit. Said trip tickets and maintenance logs shall be made immediately available to any authorized city inspector.

3. The generator shall prohibit the discharge of liquid, semi-solids, or solids back into an interceptor (GGI/HGI) during and/or after servicing. Decanting or discharging of removed waste back into the interceptor (GGI/HGI) from which the waste was removed or any other interceptor, for the purpose of reducing the volume to be disposed, is prohibited.

4. Each gravity interceptor (GGI) pumped shall be fully evacuated unless the interceptor volume is greater than the tank capacity on the vacuum truck, in which case the transporter shall arrange for additional transportation capacity so that the interceptor is fully evacuated within a 24-hour period following the transporter’s inability to fully evacuate the interceptor.