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CITY OF SANTA ANA <br />Planning and Building Agency <br />April 16, 2025 Project <br />Page 4 <br />5.0 Seismicity Evaluation <br />The proposed development lies outside of any Alquist-Priolo Special Stu <br />potential for damage due to direct fault rupture is considered unlikely. The <br />aa�gpand the <br />Date: <br />ewport-Inglewood <br />Fault is located approximately 9 kilometers from the site and is capable of producing a <br />Magnitude 6.9 earthquake. Ground shaking originating from earthquakes along other active <br />faults in the region is expected to induce lower horizontal accelerations due to smaller <br />anticipated earthquakes and/or greater distances to other faults. <br />The seismic design acceleration parameters for the project site are provided below and are <br />based upon the 2022 California Building Code (CBC) Standard ASCE/SEI 7-16. The data was <br />obtained from the American Society of Civil Engineers (ASCE) website, <br />https://asce7hazardtool.online/. The seismic design report is attached is Appendix D. <br />Seismic Design Acceleration Parameters <br />Latitude <br />33.734 <br />Longitude <br />-117.931 <br />Site Class <br />D <br />Risk Category <br />II <br />Mapped Spectral Response Acceleration <br />Ss = 1.328 <br />S, = 0.475 <br />Adjusted Maximum Acceleration <br />Sans = 1.328 <br />Design Spectral Response Acceleration Parameters <br />Sos = 0.885 <br />Peak Ground Acceleration <br />PGAM = 0.625 <br />Use of these values is dependent on requirements of Section 11-4.8, ASCE 7, exception 2 that <br />requires the value of the seismic response coefficient CS be determined by Equation 12.8.2 for <br />values of T< 1.5Ts and taken as equal to 1.5 times the value computed in accordance with either <br />12.8-3 for TL>T>1.5TS or Equation 12.8-4 for T>TL. Computations and verification of these <br />conditions is referred to the structural engineer. <br />NorCal Engineering <br />