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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />Less than <br />Significant <br />Potentially <br />Impact with <br />Less than <br />Significant <br />Mitigation <br />Significant <br />Environmental Issues <br />Impact <br />Incorporated <br />Impact <br />f) Directly or indirectly destroy a unique <br />❑ <br />❑ <br />paleontological resource or site or unique <br />geologic feature? <br />Environmental Evaluation <br />Setting <br />No Impact <br />El <br />Seismically induced surface rupture is defined as the physical displacement of surface deposits in <br />response to an earthquake's seismic waves. Surface rupture is most likely along active faults and <br />typically occurs during earthquakes of magnitude five or higher. Not all earthquakes result in surface <br />rupture. <br />The Alquist-Priolo Earthquake Fault Zoning Act was passed in 1972 to mitigate the hazard of surface <br />faulting to structures for human occupancy. The Act's main purpose is to prevent the construction of <br />buildings used for human occupancy on the surface trace of active faults. The Act requires the State <br />Geologist to establish regulatory zones, known as Alquist-Priolo Earthquake Fault Zones, around the <br />surface traces of active faults and to issue appropriate maps. If an active fault is found, a structure for <br />human occupancy cannot be placed over the trace of the fault and must be set back from the fault <br />(typically 50 feet). <br />Would the project: <br />a) Directly or indirectly cause potential substantial adverse effects, including the risk <br />of loss, injury or death involving: <br />i) Rupture of a known earthquake fault, as delineated on the most recent Alquist- <br />Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area <br />or based on other substantial evidence of a known fault? Refer to Division of <br />Mines and Geology Special Publication 42. <br />Less than significant impact. The project site is not located within an identified Alquist-Priolo <br />Earthquake Fault Hazard Zone.29 According to the City General Plan Safety Element, there are no <br />known fault traces located in the City. The closest fault is the San Joaquin Hills Fault, located <br />approximately 3.6 miles south; additional faults include El Moderno, located approximately 5.7 miles <br />to the north, and the Newport Inglewood Fault zone, located approximately 6 miles to the <br />9 California Department of Conservation (DOC). 2025. Earthquake Zones of Required Investigation. Website: <br />https://maps.conservation.ca.gov/cgs/informationwarehouse/eqzapp/. Accessed February 6, 2025. <br />52 FCS <br />Https://adecinnovaticns.sharepoint.com/sites/PubiicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISMND.docx <br />