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FOG Control Program Manual <br />^.leanout <br />utlet <br />Relief <br />)utlet Baffle <br />Figure 4-3 - Conceptual Design of a Typical Hydromechanical Grease Interceptor <br />4.4.3.1 Sizing Reviewed and Approved by City's Building Division <br />The City's Building Division will review and approve the sizing and installation of HGIs. <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 sizing requirements for HGIs are established in Chapter 10, section 1014.2 of the <br />California Plumbing Code. Regardless of the sizing method, HGIs are sized based on flow <br />rate and the pounds of FOG that they can store. Typically, HGIs have a flow capacity of <br />20 to 50 gallons per minute (gpm), store 40 to 100 pounds of FOG, and are 15 to 60 <br />gallons in volume. Flow -control fittings/devices must be installed upstream of HGIs to <br />control the wastewater flow to match the certified flow rate of the HGI. If this flow - <br />control device is not installed, the HGI may not perform properly when the flow exceeds <br />the certified flow rate. <br />HGIs are tested and certified to ASME A112.14.3 or PDI-G101 standards at the HGI's <br />specified maximum flow rate. The City requires that HGIs be certified to these standards <br />before HGIs can be approved for use in the City's service area. Plan -check approvals are <br />required to ensure that one or more HGIs are connected to the significant grease -waste <br />drains (e.g., pot sink, pre -rinse sink, work station). <br />4.4.3.2 Maintenance Requirements <br />HGIs should be cleaned before the accumulation of floating FOG and settled solids <br />exceeds 25% of the HGI's overall capacity (this is known as the 25% rule). In order to <br />prevent excessive accumulation, daily to weekly cleaning of the HGI by kitchen staff or <br />pumping contractors may be required. At a minimum, HGIs must be cleaned monthly. If <br />19F-196 is <br />