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GPH!Dpouspm!Qsphsbn!Nbovbm! Flow Control Removable LidCleanout Device InletOutlet Air Relief Fats, Oils, and Grease Inlet Baffles Outlet Baffle Solids Figure 4-3 - Conceptual Design of a Typical Hydromechanical Grease Interceptor 5/5/4/2!! HGIs. This is accomplished by requirement of the permittee, by the appropriate Building Department, for 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 sizing requirements for HGIs are established in Chapter 10, section 1014.2 of the California Plumbing Code. Regardless of the sizing method, HGIs are sized based on flow rate and the pounds of FOG that they can store. Typically, HGIs have a flow capacity of 20 to 50 gallons per minute (gpm), store 40 to 100 pounds of FOG, and are 15 to 60 gallons in volume. Flow-control fittings/devices must be installed upstream of HGIs to control the wastewater flow to match the certified flow rate of the HGI. If this flow- control device is not installed, the HGI may not perform properly when the flow exceeds the certified flow rate. HGIs are tested and certified to ASME A112.14.3 or PDI- specified maximum flow rate. The City requires that HGIs be certified to these standards -check approvals are required to ensure that one or more HGIs are connected to the significant grease-waste drains (e.g., pot sink, pre-rinse sink, work station). 5/5/4/3!Nbjoufobodf!Sfrvjsfnfout HGIs should be cleaned before the accumulation of floating FOG and settled solids prevent excessive accumulation, daily to weekly cleaning of the HGI by kitchen staff or pumping contractors may be required. At a minimum, HGIs must be cleaned monthly. If City Council 15