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<br />Mr. Dan Yoon 5150.100.001 <br />Hana Japan Steak House January 23, 2023 <br />2022 CBC SEISMIC DESIGN PARAMETERS UPDATE Latest Revision November 3, 2023 <br /> Page 3 <br /> <br />H is the design height of the wall (in feet) and ΔP is the active incremental seismic force in pounds <br />per horizontal foot of the wall. This force has a horizontal direction and should be applied at <br />0.3 x H from the base of the wall. Since seismic loading requires soil movement, the evaluation <br />of the seismic case should consist of adding the seismic increment to the active soil pressure for <br />all wall types. If retaining walls greater than 6 feet in height are planned with sloping backfill <br />conditions, we can provide active incremental seismic forces upon request. <br /> <br />We are not recommending designing the retaining walls to retain any debris from the slope above. <br />Should any debris be mobilized, this debris would flow over the walls into the parking/drive area <br />and maintenance would be required to clean it up should this occur. The note about <br />Cross-Section A-A is acknowledged. The intent of this cross section is to schematically <br />demonstrate the recommended setback from the property line in our fault study and was not <br />intended to reflect final design conditions that were developed after our report was published. <br /> <br />If you have any questions or comments regarding this letter, please call and we will be glad to <br />discuss them with you. <br /> <br />Sincerely, <br /> <br />ENGEO Incorporated <br /> <br /> <br /> <br /> <br />Jeff Fippin, GE Uri Eliahu, GE <br /> <br />jf/ue/ca