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writing. Said approved plan shall include the minimum number of grease interceptors and grease traps that can reasonably serve the structure and the BMP program shall specifically include service for all approved grease intercepts and grease traps; 3. The owner of any structure occupied by more than one FSE or FM/P shall be jointly and severally liable with the owner of each FSE or FM/P served by any grease interceptor or any grease trap for the servicing and maintenance of that grease interceptor or grease trap and for any servicing and maintenance of any sanitary sewer system located downstream from said structure to remove any accumulations of FOG therefrom; 4. The Public Works Director may require existing FSE or FM/Ps and owners of structures in which such FSE or FM/Ps are located which have been identified as introducing FOG in any portion of the sanitary sewer system, and which introduction of FOG, in whole or in combination with other FOG contributors, has been responsible for causing the need for the city to clean such portion of the sanitary sewer system more than twice in a single calendar year to install grease interceptors or other FOG equipment as deemed necessary to comply with this section. Such installation shall be completed and operational within 180 days of notice by the Public Works Director. E. Grease interceptors. Maintenance and cleaning of grease interceptors. In the maintaining and routine cleaning of grease interceptors and any other grease control device, the owner of the FSE or FM/P and the owner of the structure in which it is located, if different from the owner of the FSE or FM/P shall be responsible for the proper removal and disposal by appropriate means of the captured material. If not performed by personnel under the direct control and direction of any such owner, such removal and haul shall be performed by currently licensed waste disposal haulers who are licensed for this activity. 1. Maintenance of grease interceptors shall be performed as frequently as necessary to protect the sanitary sewer system against the accumulation of FOG. Maintenance shall be performed as determined by inspection and application of the 25-percent rule, or at 90-day intervals specified in the permit, whichever is more frequent. Maintenance shall be performed at least every 90 days. a. The 25-percent rule requires that the depth of oil and greaseFOG (floating and settled) in an trap shallinterceptor shall be less than 25 percent of the total operating depth of the trapdetermine by measuring the wetted depth from the static water level to the interior tank bottom. The operating depth of a trap is determined by ng the internal depth from the outlet water elevation to the bottom of the trap. F. Grease traps. Maintenance of grease traps shall be performed as frequently as necessary to protect the sanitary sewer system against the accumulation of FOG. Maintenance shall be performed as required by inspection and/or sampling or at 14-day intervals specified in the permit, whichever is more frequent. Maintenance11 b e F ff ed t 14 days. G. Maintenance modifications. Food service facilities which operate infrequently or only for special events may request a modification to the maintenance schedule specified above. The Public Works Director may authorize a maintenance frequency related to the operation of the food service facility. The property owner shall submit a request for a modified maintenance schedule which includes all details of operation for the director to review.