|Interceptors and/or grease traps are required when it is determined that they are necessary for the proper handling of wastewater containing grease, oil, or sand in excessive amounts. City Code requires owners of such devices to maintain them in efficient operating condition.
A properly maintained interceptor or grease trap benefits both your establishment and the citizens of Tempe. A properly maintained device reduces the risk of a costly blockage at your establishment or out in the City collection system. Odor's from devices are significantly reduced when they are routinely cleaned.
Grease traps are typically located within the kitchen area. It is recommended that grease traps be cleaned once per month. However, they should be cleaned more frequently depending on their capacity and the amount of grease discharged through the trap.
It is important to remember that waste removed from the trap is not allowed to be disposed of in the trash. Waste material removed from the trap should be properly disposed of by recycling or at an approved disposal site. The City of Tempe requires a minimum size of a 50 gallon-per-minute, 100-pound trap.
These devices are always located outside, near the building. Interceptors will always have at least one "sewer" manhole that should make it easy to determine where it is located. The City of Tempe requires a minimum size of a 500-gallon and a maximum of a 2500-gallon interceptor
An interceptor should be pumped dry and washed down to remove grease from the sides and baffles each time it is cleaned. The waste hauler should not "decant" the liquid from his truck back into the interceptor or any other sewer manholes. When completed the hauler should NOT fill the device. Allow natural usage to re-fill the interceptor.
It is recommended that a representative of your establishment be present during pumping of the interceptor to confirm that it was cleaned properly.
The City of Tempe uses the fixture count method to size interceptors.