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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project <br />inundation? <br />No impact. A seiche is an earthquake or slide -induced wave that can be generated in an enclosed <br />body of water. There is no enclosed body of water in the project vicinity. Therefore, the proposed <br />project is not in a seiche zone. <br />The project site is surrounded by existing development and is not located within a floodplain or flood <br />hazard zone. The nearest body of water is the Santa Ana River approximately 4 miles to the west. <br />A tsunami is a sea wave generated by an earthquake, landslide, volcanic eruption, or even a large <br />meteor hitting the ocean. An event such as an earthquake creates a large displacement of water <br />resulting in a rise or mounding at the ocean surface that moves away from this center as a sea wave. <br />Tsunamis generally affect coastal communities and low-lying (low -elevation) river valleys in the <br />vicinity of the coast. Buildings closest to the ocean and near sea level are most at jeopardy. According <br />to the CGS Orange County Tsunami Inundation Maps, the project site is not located within a tsunami <br />inundation area.53 <br />Potential risk from mudflow (e.g., mudslide, debris flow) does not exist within the project area as <br />steep slopes are not located in the project vicinity. Therefore, because the proposed project is not in a <br />flood hazard, tsunami, or seiche zone, therefore project implementation would not risk release of <br />pollutants from inundation by seiche, tsunami, or mudflow. No impact would occur. <br />e) Conflict with or obstruct implementation of a water quality control plan or <br />sustainable groundwater management plan? <br />Less than significant impact. The proposed project would not conflict with the County Watershed <br />Program and the County's NPDES program. Therefore, construction impacts related to water quality <br />control plan or groundwater management plan consistency would be less than significant. In addition, <br />Santa Ana Municipal Utility Services would provide potable water to the project site. As a result, the <br />proposed project would not conflict with or obstruct a sustainable groundwater management plan. <br />Therefore, operational impacts related to obstructing implementation of a water quality control plan or <br />groundwater management plan would be less than significant. <br />Mitigation Measures <br />None required. <br />" California Department of Conservation (DOC). Orange County Tsunami Hazard Areas. Website: <br />https://www.conservation.ca.gov/cgs/tsunami/maps/orange. Accessed May 6, 2025. <br />70 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 />