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RKomnwnded <br />.Manhole <br />Manholes <br />InletCFO it., „�--�„�,�, <br />KIN <br />F i <br />r <br />— Fats, Oi 1. and <br />x Grease <br />i <br />F <br />Solids <br />FOG Control Program Manual <br />-- <br />Outlet <br />Sample Box <br />Figure 4-2: Typical Conceptual Gravity Grease Interceptor Design — Side View <br />The proper plumbing and placement of baffles will provide the non -turbulent <br />conditions. The proper dimensions and volume of the interceptor will provide sufficient <br />retention time to allow the particles to fully rise or settle before they pass -through to <br />the outlet of the interceptor. Over time, the grease and solids layers thicken and will <br />eventually fill the first chamber if they are not removed. If the grease and solids are not <br />removed regularly, the interceptor no longer functions for its intended purpose, and <br />FOG will be carried into the sewer system. Emulsified or partially emulsified particles <br />will rise or settle slower, which is why soaps and other emulsifiers may cause some <br />grease or solids to pass -through an interceptor and collect downstream of the <br />interceptor. <br />Since an interceptor is not self-cleaning or free of maintenance, it is critical that an <br />interceptor be suitably designed with manholes in the right locations to facilitate <br />maintenance and that it be cleaned and pumped at a frequency that maintains its <br />design removal efficiency. <br />4.4.2.1 Sizing Reviewed and Approved by City's Building Division <br />The City's Building Division will review and approve the sizing and installation of GGIs. <br />This is accomplished by requirement of the permittee, by the appropriate Building <br />Department, for the City's approval prior to issuance of the building permit. Refer to <br />Appendix L, New FSE FOG Program Requirements Review Process, for the process <br />utilized to refer the permittee to the City for grease interceptor installation and sizing <br />approval. Appendix M also includes the FOG Program Application Form that a facility <br />completes prior to the grease interceptor installation decisions are made. <br />The Building Division will base the design and sizing of the grease interceptors on the <br />current version of California Plumbing Code. Chapter 10 of the California Plumbing Code <br />1191 <br />