4A Public Hearing 2015 0120 - Laserfiche WebLink

Home

City of San Leandro Housing Element Update (2015-2023) Project Initial Study and Environmental Checklist updated FIRM panels. These analyses along with local topographic data will to be used to evaluate the loca- tion and extent of Special Flood Hazard Areas (SFHAs) and base flood elevations (BFEs). The preliminary maps will be produced in 2015.29 However, a preliminary map provided by FEMA shows the housing oppor- tunity sites would be within the 100 -year floodplain .30 As a result, residential sites identified generally on the western side of the city could be subject to flooding. Adoption of the Housing Element alone would not result in the physical development of residential units; however, three Housing Element Sites are partially within the FEMA flood zone (AE [areas which base flood elevations have been determined]); therefore, fixture residential development as a result of implementation of the Housing Element could be placed within the 100 -year flood zone. Anticipated development associated with the Housing Element would be restricted to the existing urbanized environment in areas where residen- tial development is currently allowed. Potential future development under the proposed Project would be required to comply with the 2002 General Plan goals, policies, and action related to flood safety included in the Environmental Hazards Element. Consequently, implementation of the proposed Project would result in less -than -significant impacts. h) Would the project place within a 100 year flood ha.Zard area structures which would impede or redirect flood flows? See Section IX.g above. i) Would the project expose people or structures to a significant risk of loss, injury, or death involving flooding including flood- ing as a result of the failure of a levee or dam? According to the 2002 General Plan, most of San Leandro would be flooded in the event of dam failure at the Lake Chabot or Upper San Leandro Reservoirs.31 As such, several of the sites identified in the Housing Element could be placed within dam inundation zones as a result of San Leandro being directly adjacent to the west of Lake Chabot and the Upper San Leandro Reservoir. However, as previously mentioned, adoption of the Housing Element alone would not result in physical development, but only identifies sites available for residential development, which have previously been zoned for residential use. Although potential develop- ment as a result of implementation of the Housing Element could place housing within the inundation zones, the impacts of dam failure were analyzed in the San Leandro General Plan EIR and the TOD Strategy EIR and were determined to be less than significant. Consistent with state law, policies in the General Plan ad- dress a complete range of flooding and seismic hazards, including dam failure. Therefore, potential impacts due to dam inundation would be less than significant. j) Would the project potentially be inundated by seiche, tsunami, or mudflow? According to the CalEMA tsunami inundation map for emergency planning, areas of western San Leandro along the San Francisco Bay are susceptible to inundation by tsunami.32 However, as mentioned in the Gen- eral Plan, a 100 -year frequency tsunami would generate a wave run-up of 4.4 feet at the San Leandro Shore - 29 Federal Emergency Management Agency (FEMA), 2014. Northern Alameda County, California. San Francisco Bay Area Coastal Study, March. 30 Email correspondence between FEMA, Alameda County, and the City of San Leandro in December 2013 and preliminary FIRM maps provided by FEMA. 31 City of San Leandro General Plan, 2002, Chapter 6, Environmental Hazards, page 6-8. 32 California Emergency Management Agency, Tsunami Inundation Map for Emergency Planning, July 31, 2009, http:/ /www.conservation.ca.gov/cgs/geologic_hazards/Tsunami/Inundation_Maps/Alameda/Documents/Tsunami_Inundation_Sa nLeandro_Quad_Alameda.pdf, accessed on November 11, 2014. Page 136