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SENDER READY -MIX CONCRETE MANUFACTURING PROJECT ' Initial Study /Mitigated Negative Declaration Otherwise substantially degrade water quality? ' Less Than Significant Impact. The proposed project is not anticipated to result in water quality impacts other than the potential short-term construction and long -term operational impacts identified ' above in Responses 4.9(a), 4.9(c), and 4.9(e). Impacts in this regard would be less than significant. Mitigation Measures: No mitigation is required. ' g) Place housing within a 100 -year Hood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map? ' No Impact According to the Federal Emergency Management Agency (FEMA), the project site is situated within Zone X, which is outside of the 100 -year flood hazard area.5 In addition, no housing ' would be constructed as part of the proposed project. No impact would occur in this regard. Mitigation Measures: No mitigation is required. ' h) Place within a 100 -year flood hazard area structures which would impede or redirect flood flows? ' No Impact As stated above in Response 4.9(g), the project site is not located within a 100 -year flood hazard areas The proposed project would not impede or redirect flood flows, and no impact would occur. ' Mitigation Measures: No mitigation is required. i) t Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam? Less Than Significant Impact Based upon the Public Safety Element of the City's General Plan, the inundation area for Prado Dam affects portions of the City. Prado Dam is situated approximately 15 miles northeast of the project site. The Public Safety Element indicates that the project site is situated outside of the identified dam inundation area. In addition, no levees are situated in the vicinity of the ' project site. Thus, impacts in this regard would be less than significant. Mitigation Measures: No mitigation is required. j) Inundation by seiche, tsunami, or mudflow? ' Less Than Significant Impact A seiche is an oscillation of a body of water in an enclosed or semi- enclosed basin, such as a reservoir, harbor, lake, or storage tank. A tsunami is a great sea wave, commonly referred to as a tidal wave, produced by a significant undersea disturbance such as tectonic , displacement of a sea floor associated with large, shallow earthquakes. Mudflows result from the downslope movement of soil and/or rock under the influence of gravity. 5 Federal Emergency Management Agency, Flood Insurance Rate Map #06059CO276J, Panel 276 of 539, revised December 3, 2009. ' s Ibid. JULY 2011 4.9 -4 HYDROLOGY AND WATER QUALITY , 31A-68