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8.B. - Page 59 <br /> HYDROLOGY AND WATER QUALITY <br /> Less Than <br /> Potentially Significant Less Than <br /> Significant With Significant No Impact Beneficial Information <br /> Impact Mitigation Impact Impact Source(s) <br /> Incorporated <br /> Would the project: <br /> 9) Expose people or structures to a � � � � � 1,2 <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 <br /> tsunami, or mudflow? <br /> 4.9.21 Flooding <br /> While Redwood City is adjacent to the Bay,the potential risk of sea waves or tsunamis impacting the <br /> City is considered low as the City lies appro�mately 10 miles east of the Pacific Ocean shoreline, <br /> outside the County of San Mateo Tsunami Evacuation Planning Area. The project would not be <br /> subject to inundation by seiche,tsunami, or mudflow. The site is not located within a 100-year flood <br /> hazard zone. The project site is not within an area that could potentially be exposed to inundation <br /> from sea level rise.28 Implementation of the proposed project would not,therefore,result in people <br /> or structures being exposed to significant flood risks. (No Impact) <br /> 4.9.2.2 Water Quality <br /> Construction <br /> Implementation of the project would result in the disturbance of appro�mately 0.71 acres. The <br /> project would not be required to comply with the NPDES General Permit for construction activities <br /> because construction activities would disturb less than one acre of land. Demolition and construction <br /> activities would,however,temporarily increase the amount of debris on-site and grading activities <br /> could increase erosion and sedimentation that could be carried by runoff into natural waterways. <br /> Impact HYD-1: Construction activities could temporarily increase pollutant loads in <br /> stormwater runof£ (Significant Impact) <br /> Miti�ation Measures: Per City requirements the following measures,based on RWQCB <br /> recommendations,have been included in the project to reduce potential construction-related water <br /> quality impacts. <br /> MM HYD 1-1: Burlap bags filled with drain rock will be installed around storm drains to <br /> route sediment and other debris away from the drains. <br /> MM HYD 1-2: Earthmoving or other dust-producing activities would be suspended during <br /> periods of high winds. <br /> �gSan Francisco Conservation and Development Commission. Shoreline Areas Potentially E�osed to Sea Level <br /> Rise: Central South Bay. <http://www.bcdc.ca. o�v/plam�ing/climate chan e.°�ps/16_55/cbav_south.pdf> <br /> Accessed November 30,2011. <br /> 1410 Valota Road Residential Project 47 Initial Study <br /> Redwood City January 2012 <br />