1601 N Bristol St - Phase 2 - REV 1 - Plan

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G A.G.LGEOTECHNICA CITY OF SANTA ANA Planning and Building Agency may, lS. Approved FNR�.ERMIT ISSUANCE 16555 Sherman Way, Suite A - Van Nuys, CA 91406 - Office: (818) 785-5244 - Facsi ile: (818) 785-6251 Master ID: Date: April 18, 2025 Proj ct No. 32-6235-04 Mr. Amir Houriani 714 S. Plymouth Blvd. Los Angeles, CA 90005 Subject: ADDENDUM REPORT— UPDATED SEISMIC DESIGN Proposed 1-Story Drive-Thru Restaurant Building On -Grade 1601 - 1607 N. Bristol Street Santa Ana, California References: DOCUMENT REPORT NO. DATE PREPARED BY Addendum Report 32-6235-03 02/16/24 AGI Geotechnical, Inc. Addendum Report 32-6235-02 10/02/23 AGI Geotechnical, Inc. Addendum Report 32-6235-01 05/16/23 AGI Geotechnical, Inc. Soils Report 32-6235-00 08/29/22 AGI Geotechnical, Inc. Dear Mr. Houriani: This addendum report has been prepared to present the updated seismic design parameters for the subject site. California Building Code Seismic Parameters Based on information derived from the subsurface exploration, we classified the subject site as Site Class D, which corresponds to a "Stiff Soil' Profile, in accordance with the 2022 California Building Code (2022 CBC) which refers to ASCE 7-16. Per Section 11.4.8 ofASCE 7-16, structures shall be designed for the seismic response coefficient Cs determined by Eq. (12.8-2) for values of T s 1.5 Ts, as 1.5 times the value computed in accordance with Eq. (12.8-3) for TL >_ T > 1.5 Ts, or as 1.5 times the value computed in accordance with Eq. 37.5 (12.8-4) for T > TL where: T = the fundamental period of the building Ts = SD1/SDS TL = long -period transition period The design spectral response acceleration parameters presented on the following table generated by the U.S. Seismic Design Map Website (https:Hseismicmaps.org), may be utilized for seismic design: Engineering Geology - Soil Engineering