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MainPlace Mall Transformation Project 12126.001 <br />relatively flat and no landslides are mapped or known to exist at the project site <br />or vicinity. Therefore, seismically -induced landslides is not considered a hazard <br />for the site. <br />Design Consideration: Seismically -induced landslide is not a design <br />consideration for the project. <br />3.7 Flooding <br />According to the City of Santa Ana's General Plan, Public Safety Element (City of <br />Santa Ana, 1982), the project site is located within an area with a 500 year flood <br />risk. This is based on the long history of the Santa Ana River overflowing its <br />banks and flooding the surrounding areas. To reduce this risk, the U.S. Army <br />Corps of Engineers (Corps) is implementing the Santa Ana River Mainstem <br />Project, which includes raising the height of Prado Dam and constructing new <br />gate -works to control water releases and other channel improvements. <br />However, as shown on Figure 6, Flood Hazard Zone Map, the site is not located <br />within an area considered to have a 1 % annual chance of flood (100-year flood) <br />or a 0.2% annual chance of flood (500-year flood). In addition, based on review <br />of the Federal Emergency Management Agency (FEMA) Flood Insurance Rate <br />Map (FIRM) for the project site and immediately surrounding area is located <br />within a zone designated as Zone X, or an area with reduced flood risk due to <br />levee (FEMA, 2009). Based on this information, the potential for flooding at the <br />site is considered low. <br />Design Consideration: Regional flooding is not a design consideration for <br />the project. <br />3.8 Seiches and Tsunamis <br />Seiches are large waves generated in very large enclosed bodies of water or <br />partially enclosed arms of the sea in response to ground shaking. Tsunamis are <br />waves generated in large bodies of water by fault displacement or major ground <br />movement. Based on the inland location of the project site and the lack of large <br />enclosed water bodies nearby, seiche and tsunami risks are not considered as <br />seismic hazards for the site. <br />Design Consideration: Seiches and tsunamis is not a design consideration <br />for the project. <br />�'♦� <br />10 / <br />Leighton <br />