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Any <br />Substantially <br />Any Substantial <br />Changed <br />Changes <br />Circumstances <br />Involving New <br />Involving New <br />Significant <br />Significant <br />Impacts or <br />Impacts or <br />Any New <br />Project <br />Impact Substantially <br />Substantially <br />Information of <br />Incorporates <br />Issues (and supporting Information Determination More Severe <br />More Severe <br />Substantial <br />Mitigation <br />Sources) in EIR Impacts? <br />Impacts? <br />Importance? <br />Measure(s)? <br />resource or site or unique <br />geologic feature? <br />4.7.1 Impact Determination in the EIR <br />Alquist-Priolo Earthquake Fault Zone <br />The Certified EIR stated that there are no active faults, or currently mapped Earthquake Fault <br />Zone State Special Study Zones (formerly known as Alquist-Priolo Zones) within the Overlay Zone <br />that would cause a fault rupture. The Overlay Zone is also not located within any currently mapped <br />Seismic Hazard Zone, where a site -specific investigation to determine the location of any faults <br />would be required. The Overlay Zone would have no impact associated with exposing people or <br />structures to rupture of a known earthquake fault, and no impacts would occur. <br />Strong Seismic Ground Shaking <br />The Certified EIR stated that the Overlay Zone is located in close proximity to two major fault <br />zones, including the Newport- Inglewood fault zone and the Whittier -Elsinore fault zone, each with <br />the potential to cause moderate to large earthquakes that would cause ground shaking in Santa <br />Ana and nearby communities. Consequently, the Overlay Zone would expose on -site structures <br />and people to substantial seismic hazards if an intense earthquake occurred along any of the <br />major faults in the area. Active and potentially active faults in the Santa Ana area are capable of <br />producing seismic shaking at the project site. Additionally, it is anticipated that the project site <br />would experience ground acceleration caused by small and moderate magnitude earthquakes on <br />distant active faults. <br />In order to reduce the risks associated with seismically induced groundshaking, it is necessary to <br />take the location and type of subsurface materials into consideration when designing or retrofitting <br />foundations and structures for a particular project site. Because the Overlay Zone site is in <br />Seismic Zone 4, as is most of Southern California, structures are required to be designed in <br />accordance with applicable parameters of the current California Building Code (CBC). Specific <br />engineering design and construction measures as required by CBC for the construction of new <br />buildings and/or structures would be implemented to anticipate and avoid the potential for adverse <br />impacts to human life and property caused by seismically induced groundshaking. In addition, <br />adherence to Mitigation Measure MM-OZ 4.5-1 would further ensure that site -specific construction <br />measures would be implemented to reduce any additional geotechnical hazards, including <br />groundshaking. <br />Cabrillo Town Center City of Santa Ana <br />Technical Memorandum August 2023 <br />City Council 18 — 533 10/3/2023 <br />