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SANTA ANA REZONE PROJECT INITIAL STUDY/MITIGATED NEGATIVE DECLARATION Environmental Issues f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? Environmental Evaluation Setting Less than Significant Potentially Impact with Significant Mitigation Impact Incorporated ❑ ❑ Less than Significant Impact No Impact ® ❑ Seismically induced surface rupture is defined as the physical displacement of surface deposits in response to an earthquake's seismic waves. Surface rupture is most likely along active faults and typically occurs during earthquakes of magnitude five or higher. Not all earthquakes result in surface rupture. The Alquist-Priolo Earthquake Fault Zoning Act was passed in 1972 to mitigate the hazard of surface faulting to structures for human occupancy. The Act's main purpose is to prevent the construction of buildings used for human occupancy on the surface trace of active faults. The Act requires the State Geologist to establish regulatory zones, known as Alquist-Priolo Earthquake Fault Zones, around the surface traces of active faults and to issue appropriate maps. If an active fault is found, a structure for human occupancy cannot be placed over the trace of the fault and must be set back from the fault (typically 50 feet). Would the project: a) Directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist- Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. Less than significant impact. The project site is not located within an identified Alquist-Priolo Earthquake Fault Hazard Zone.29 According to the City General Plan Safety Element, there are no known fault traces located in the City. The closest fault is the San Joaquin Hills Fault, located approximately 3.6 miles south; additional faults include El Moderno, located approximately 5.7 miles to the north, and the Newport Inglewood Fault zone, located approximately 6 miles to the 29 California Department of Conservation (DOC). 2025. Earthquake Zones of Required Investigation. Website: https://maps.conservation.ca.gov/cgs/informationwarehouse/eqzapp/. Accessed February 6, 2025. CRy Council 22 — 66 3/rM026 Https://adecinnovations.sharepoint.cam/sites/PubIicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISM ND.docx