AgdaPkt 2016-04-25 Closed and Joint SA PFA

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7.B. - Page 88 2 Environmental Analysis increase as predicted, the water surface elevation during an extreme storm or tidal event would exceed the top of the creek-side wall. A sea level rise of 4.6 feet (55 inches) by the year 2100 would increase the MHHW to 12.0 feet. This daily MHHW level would exceed the adjacent banks of Redwood Creek,potentially flooding the nearby development areas. The City would need to implement other measures to mitigate this potential impact. See Mitigation Measure HYD 2 below. The City anticipates that inundation of the joint-use path during some peak storm and tidal events and would close the path to avoid risk to the public. The project would include provisions to discourage users during extreme events. City maintenance staff would be responsible to close access to the joint-use path when unsafe conditions are apparent. Call boxes at each end of the joint-use path under US 101 would provide direct access to City emergency dispatch services or 911. Temporary closing of the path would not result in increase flooding risk elsewhere,but would reduce the use of the path and decrease its benefits. The following measure would reduce the effect of increased sea levels in the project area. Mitigation Measure HYD 2: Increased Height of Creek-side Wall The height of the creek-side wall may require retrofitting if future sea level rise in Redwood Creek results in frequent flooding of the joint-use path during 5 or 10 year storm events. The City shall monitor seal level rise and retrofit the creek-side wall when necessary. With the proposed mitigation,the effect of increased flooding would be less than significant. (Less than Significant Impact with Mitigation Incorporation) j)Inundation by seiche, tsunami, or mudiow.? The project area would be located near an area subject to tidal seiches. The buffer of the islands around the project area and distance from the San Francisco Bay shoreline would decrease the severity of impacts associated with seiches and protect against tsunamis (City of Redwood City, 2010). Gate closures during such emergency conditions and call boxes would reduce potential risks to the public, and the impacts of these events would be a less than significant. (Less than Significant Impact) 2.10 LAND USE AND PLANNING The proposed US 101 undercrossing would create a strong physical link between the Downtown district and the Bayfront,implementing a major objective of the North Main Street Precise Plan (North Main Street Precise Plan 2007),the Peninsula Park Precise Plan,and the General Plan. The proposed pedestrian and bicycle access improvements would strengthen the corridor linking these important evolving districts. 2-48 US 101 Pedestrian Undercrossing and Bair Island Road Storm Drain Pump Station Project