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01/24/2011 Exhibit B development allowed by the DPP would not cause a depletion of groundwater supplies. Given the already developed condition of the DPP area, development allowed by the DPP would not result in a substantial increase in impervious surface area. Therefore, the DPP would not substantially interfere with groundwater recharge. The impacts of the DPP related to groundwater would be less than significant. Impact 10j. Flooding Impacts. As part of the City's participation in the National Flood Insurance Program, all new developments within designated flood hazard zones are required to meet specific flood damage avoidance requirements. Compliance with these requirements will ensure that the DPP does not place people or structures at unacceptable risk of injury or loss from flooding, and the potential flooding related impacts of the DPP are considered less than significant. Impact 10k. Flooding Impacts Related to Dam Failure. The western portion of the DPP area is within the Emerald Lake dam failure inundation area, and could be subject to flooding and associated risk of injury and loss of property in the event of a catastrophic failure of the dam. Redwood City participates in the CA OES dam failure inundation mapping and emergency procedure program and has included potential dam failure in its emergency preparedness, response and evacuation programs. Therefore, the potential flooding impacts related to failure of the Emerald Lake dam would be less than significant. Impact 101. Seiche, Tsunami and Mudflow Impacts. These are risks associated with seismic activity near large bodies of water, or the flow of mud and other debris from hillsides. The DPP area is flat and far from hillsides, and is not subject to risk from debris flow source areas as mapped by the Association of Bay Area Governments, based on data from the U.S. Geological Survey. The potential impacts of the DPP related to seiche, tsunami and mudflow would be less than significant. 11 Noise and Vibration Impact lla. Permanent Increases in Noise Levels. Development contemplated by the DPP could change noise levels by facilitating new development in the DPP area and changing traffic patterns. The expected increase in traffic noise level attributable to the DPP would be from less than 1 to up to 2 dBA CNEL. Total noise level increases of 3 dB or greater would be considered significant in this existing urban environment. Therefore, any increases in traffic noise levels as a result of the DPP are expected to be less than significant. U:\Resolutions\2011\Reso 15086 Exhibit B.doc 11 012011 Reso. # 15086 Muff #601