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File Number: 16-174 <br />Proposed FIRMs indicate that most of the 100 year flood zone expansion is due to four <br />locations where flood water enters developed areas. Alameda County Flood Control and City <br />staffs have identified mitigation measures at these four locations that potentially eliminate the <br />related 100 year flood zone expansion. There are six parcels of land that are added to the <br />100 year flood zone on the FIRMs that will not be impacted by mitigation measures at these <br />four locations. Additionally City staff has initiated the application process for the FY 2016 <br />Pre -Disaster Mitigation (PDM) Grant Program sponsored by FEMA that could potentially fund <br />75% of the implementation cost of some of these mitigation efforts. <br />Analysis <br />Expansion of the 100 year flood zone can be reduced by constructing improvements at four <br />locations. If these mitigation measures are not constructed, then the published risk of flooding <br />for approximately 1,090 parcels of land will increase to 1 % per year. Individual properties <br />within the 100 year flood zone may have elevations sufficient to prevent flooding. Property <br />owners may hire a surveyor to determine the elevation of their land and/or buildings and may <br />file an elevation certificate with FEMA and request exclusion from the flood zone if their <br />property is above the base flood elevation. Properties newly added to the 100 year flood zone <br />that have a federally backed mortgage will be required to purchase flood insurance annually. <br />Mitigation Location No. 1 - Davis Street/Water Pollution Control Plant <br />FEMA indicates that there is a low point in the north bank of the slough at the west end of <br />Davis Street, adjacent to the driveway of the City's Water Pollution Control Plant (WPCP). <br />Per the proposed FIRMs, water entry at this point increases the 100 year flood zone to include <br />sixteen additional properties on Davis Street and Eden Road, including the land that WPCP is <br />built upon. Staff has issued a purchase order for a topographic survey of this area and will <br />include raising the grade adjacent to the slough and driveway in the upcoming WPCP <br />Asphaltic Concrete (AC) replacement project. As this project is underway, additional WPCP <br />Enterprise funding of up to $60,000 may be required and if needed will be requested at the <br />time of project award. This project is scheduled for construction in 2017. <br />Mitigation Location No. 2 - 13165 Neptune Drive <br />A low point on the San Francisco Bay shoreline behind 13165 Neptune Drive has been <br />identified as one of two points that allow water to enter into the Marina Faire and Mulford <br />Gardens neighborhoods. Per the proposed FIRMs, water entry at these points increases the <br />100 year flood zone to include 1,054 additional properties. This low point can be eliminated <br />by importing soil, grading the site, and installing rip rap or rock protection along the San <br />Francisco Bay shoreline. Staff has contacted the property owners of 13165 Neptune Drive; <br />they support the project and are willing to entertain a request for permission to construct these <br />improvements. The project is estimated to cost $500,000; staff has applied for a FEMA grant <br />that could fund up to 75% of these costs. Staff recommends exploring formation of an <br />assessment district to cover any costs not covered by grant funds. The assessment district <br />will consist of all parcels that would be removed from the 100 year flood zone by the project. <br />Absent grants, the cost per parcel would be approximately $475 which is close to the cost of <br />discounted flood insurance for one year, and less than half the average annual cost of flood <br />insurance in San Leandro. Costs per parcel could be as low as $120 if a FEMA grant is <br />City of San Leandro Page 2 Printed on 4111/2016 <br />