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specified in the permit, whichever is more frequent. Maintenance shall be performed at least <br /> every 90 days. <br /> a. The 25-percent rule requires that the depth of oil and grease (floating and settled) in a trap <br /> shall be less than 25 percent of the total operating depth of the trap. The operating depth of a <br /> trap is determined by measuring the internal depth from the outlet water elevation to the <br /> bottom of the trap. <br /> F. Grease traps. Maintenance of grease traps shall be performed as frequently as necessary to <br /> protect the sanitary sewer system against the accumulation of FOG. Maintenance shall be <br /> performed as required by inspection and/or sampling or at intervals specified in the permit, <br /> whichever is more frequent. Maintenance shall be performed at minimum every 14 days. <br /> G. Maintenance modifications. Food service facilities which operate infrequently or only for <br /> special events may request a modification to the maintenance schedule specified above. The <br /> Public Works Director may authorize a maintenance frequency related to the operation of the <br /> food service facility. The property owner shall submit a request for a modified maintenance <br /> schedule which includes all details of operation for the director to review. <br /> H. Disposal. The property owner shall be responsible for the proper removal and disposal of the <br /> grease interceptor or trap waste. All waste removed from each grease interceptor or trap must <br /> be disposed of properly at an appropriate facility designed to receive grease i nterceptor or <br /> trap waste. No grease interceptor or trap waste shall be discharged into any City sanitary or <br /> storm sewer system. <br /> I. Maintenance log. The property owner shall be responsible for retaining records of the <br /> maintenance of grease interceptors and traps including manifests,permits, permit applications, <br /> correspondence, sampling data and any other documentation that may be requested by the City. <br /> This log shall include the dates of service. volume of waste removed, waste hauler, and disposal <br /> site of waste. These records shall be kept on-site at the location of the grease interceptor or <br /> trap for a period of three years and are subject to review by the City upon request without <br /> prior notification. <br /> J. Inspection. The City will perform periodic inspections of these facilities and shall notify the <br /> property owner of any additional required maintenance or repairs. Upon written notification by <br /> the City, the property owner shall be required to perform the maintenance and records of said <br /> maintenance within 14 calendar days. Upon inspection by the City the property owner may be <br /> required to install, at their expense, additional controls to provide a complete system which <br /> prevents discharges of FOG into the sanitary sewer system. <br /> K. Exception from grease interceptor requirements. If the owner of any FSE or FM/P or of any <br /> structure in which an FSE or FM/P is located or is to be located demonstrates to the <br /> reasonable satisfaction of the Public Works Director that installation of a grease interceptor is <br /> not feasible, the Public Works Director may grant an exception allowing such owner to install <br /> grease traps or other alternative treatment technology which will in their discretion <br /> adequately control the release of FOG from the FSE or FM/P or the structure into the sanitary <br /> sewer system. The FSE or FM/P bears the burden of demonstrating that the installation of a <br /> grease interceptor is not feasible to the satisfaction of the Public Works Director. <br /> L. Charge for remedial maintenance or repair of the City sanitary sewer system. <br /> I. In the event that the owner of an FSE or FM/P or the owner of any structure in which an <br /> FSE or FM/P is located is found to have contributed to the partial or complete obstruction of a <br /> sanitary sewer system resulting from the discharge of wastewater or waste containing FOG and <br /> that the City is required to act immediately to control a public health hazard because of such <br /> blockage, such owner shall be required to reimburse the City for all costs of abating such <br /> condition. In situations where there are multiple owners identified as contributing to FOG <br /> causing such obstruction, the Public Works Director will apportion the cost of the cleanup, <br /> maintenance or repair costs on a prorated basis, based on each owner's percentage share of the <br /> average total sanitary sewer charges for all such owners. Further=should inspection, testing or <br /> other sampling activity by the City confirm that any property owner is contributing FOG <br /> (including other harmful ingredients) and is causing the repair or excessive maintenance <br /> activity to maintain the sanitary sewer system, the Public Works Director may require <br />