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GPH!Dpouspm!Qsphsbn!Nbovbm! Figure 4-2: Typical Conceptual Gravity Grease Interceptor Design Side View The proper plumbing and placement of baffles will provide the non-turbulent conditions. The proper dimensions and volume of the interceptor will provide sufficient retention time to allow the particles to fully rise or settle before they pass-through to the outlet of the interceptor. Over time, the grease and solids layers thicken and will eventually fill the first chamber if they are not removed. If the grease and solids are not removed regularly, the interceptor no longer functions for its intended purpose, and FOG will be carried into the sewer system. Emulsified or partially emulsified particles will rise or settle slower, which is why soaps and other emulsifiers may cause some grease or solids to pass-through an interceptor and collect downstream of the interceptor. Since an interceptor is not self-cleaning or free of maintenance, it is critical that an interceptor be suitably designed with manholes in the right locations to facilitate maintenance and that it be cleaned and pumped at a frequency that maintains its design removal efficiency. 5/5/3/2!Cvjmejoh!Ejwjtjpo Building Division will review and approve the sizing and installation of GGIs. This is accomplished by requirement of the permittee, by the appropriate Building efer to Appendix L, New FSE FOG Program Requirements Review Process, for the process utilized to refer the permittee to the City for grease interceptor installation and sizing approval. Appendix M also includes the FOG Program Application Form that a facility completes prior to the grease interceptor installation decisions are made. The Building Division will base the design and sizing of the grease interceptors on the current version of California Plumbing Code. Chapter 10 of the California Plumbing Code 13