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GPH!Dpouspm!Qsphsbn!Nbovbm! <br /> <br />Based on the process flow chart, the majority of existing FSEs that do not have grease <br />install a grease interceptor. However, if the FSE has continued program violations or if <br />the FSE is identified as a significant contributor of FOG (i.e., causes or contributes to <br />blockage or SSO) to the sewer system, the may be revoked <br />requiring the installation of a grease interceptor. An example Conditional Waiver <br />Approval is available as Appendix I. <br /> <br />5/4/3/3!Puifs!Sfrvjsfnfout!ps!Npejgjdbujpot! <br /> <br />There are other situations where specific requirements may be required by the FOG <br />Control Program Manager. For example: <br /> Authorization for the utilization of an additive <br /> Requirement for increased maintenance frequency of the grease interceptor <br /> Authorization for decreased maintenance frequency of the grease interceptor <br /> Requirement to submit records (grease interceptor maintenance log and waste <br />hauling manifests and other logs) to the City on a semi-annual basis <br /> <br />4.4 '±¤ ²¤ )­³¤±¢¤¯³®±s <br />5/5/2 PWFSWJFX! <br /> <br />Grease interceptors are grease collection devices that separate FOG (or grease), solids, <br />and water based on <br />settling of a particle in a fluid (water in this case). Simply put, under non-turbulent <br />conditions in an interceptor, given enough time, particles that are lighter than water <br />(e.g., grease) will rise to the surface and particles that are heavier than water (e.g., <br />solids) will settle to the bottom. <br />the sanitary waste lines (Appendix J, Plumbing Segregation Example, provides an <br />example of the plumbing that is required to be segregated from a grease interceptor. <br />Facilities receiving conditional waivers must separate their grease waste lines from the <br />sanitary waste lines in-case a grease interceptor is required to be installed at a future <br />date. The different types of grease interceptors are discussed below. <br /> <br />5/5/3 HSBWJUZ!HSFBTF!JOUFSDFQUPST! <br /> <br />Gravity grease interceptors (GGI) are larger, volume-based grease-control devices that <br />are typically installed outside and underground. GGIs can range in volume from 300 to <br />15,000 gallons. The flow of water through the GGI is controlled by the baffle tubes; <br />therefore, it is critical that the baffle tubes are installed properly and kept in good <br />condition for the GGI to function properly. A conceptual view or a typical GGI <br />configuration is illustrated in Figure 4-2, ǤƦźĭğƌ /ƚƓĭĻƦƷǒğƌ DƩğǝźƷǤ DƩĻğƭĻ LƓƷĻƩĭĻƦƷƚƩ <br />5ĻƭźŭƓ {źķĻ źĻǞ, and in Appendix K, Grease Interceptor Standard Plan. <br /> <br /> <br />City Council <br />12 <br /> <br />