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HYDROLOGY AND WATER QUALITY <br /> Less Than <br /> Potentially Significant Less Than <br /> Significant With Significant No Impact Beneficial Information <br /> Impact Mitigation �p�f �P�f Source(s) <br /> Incorporated <br /> Would the project: <br /> 9) Expose people or structures to a � � � � � 1,2,3 <br /> significant risk of loss,injury, or <br /> death involving flooding,including <br /> flooding as a result of the failure of <br /> a levee or dam? <br /> 10)Be subject to inundation by seiche, � � � � � 1,2,3 <br /> tsunami, or mudflow? <br /> 4.9.3.1 Flooding Impacts <br /> Based on the FEMA flood insurance rate maps,the site is outside the 100-year and 500-year flood <br /> plain. In addition,the project site is not susceptible to flooding as a result of levee or dam failure. <br /> Because of the location of the site and its distance from a 100-year flood zone,implementation of the <br /> proposed project will not subject housing or residents to flooding hazards. (Less Than Significant <br /> Impact) <br /> The project site is not subject to inundation by seiche or mudflows. While Redwood City is adjacent <br /> to the Bay,the potential risk of sea waves or tsunamis impacting the City is considered low as the <br /> City lies appro�mately 10 miles east of the Pacific Ocean shoreline, outside the County of San <br /> Mateo Tsunami Evacuation Planning Area. Therefore,the project site would not be subject to <br /> inundation by tsunamis. (No Impact) <br /> 4.9.3.2 Storm Drainage Impacts <br /> Please refer to the discussion in Section 4.1723 of this document. <br /> 4.9.3.3 Groundwater Impacts <br /> The proposed project will have more impermeable surface area than the existing condition,but this <br /> will not affect the overall groundwater supply as the site is not a designated recharge area. Due to <br /> the depth to groundwater on-site,implementation of the proj ect site will not interfere with <br /> groundwater flow or expose any aquifers. The water supply for the project site will not be met from <br /> the groundwater supply and, as a result,the project will not deplete the existing groundwater supply <br /> or impact the groundwater aquifer. (Less Than Significant Impact) <br /> 4.9.3.4 Water Quality Impacts <br /> Construction Impacts <br /> Implementation of the proposed project would temporarily increase pollutant loads due to grading <br /> and construction (i.e., demolition of the existing building,removal of pavement, and construction of <br /> new structures). Demolition and construction activities would temporarily increase the amount of <br /> Kensington Assisted Living Facility Project 55 Initial Study <br /> Redwood City Apri12013 <br />