14-020 - City of Kent - Briscoe-Desimone Levee Repair

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Flood Agreement No. G1300118 between the Washington State Department of Ecology and the King County Flood Control Zone District Project: Briscoe / Desimone Levee Improvements Scope of Work Project Title: Briscoe - Desimone Levee Improvements Description: The project involves improvements to the Briscoe and Desimone levees which are on the right (eastern) bank of the Green River between River Miles (RM) 14.3 -17.00 in the cities of Kent and Tukwila. The Briscoe and Desimone levees are aging earthen levees with over - steepened slopes, a levee crest less than 12 feet wide, and toe scour protection that is generally missing or inadequate. The adjoining river channel lacks adequate in- stream and aquatic edge habitat structure, such as deep pools, large woody debris, and overhanging cover. While originally built to provide flood risk reduction to farmland in the Kent Valley, these aging levees now protect $2.8 billion worth of urban structures and contents. A levee breach or overtopping in this location would have serious implications including threats to public safety, damage to public infrastructure, impacts on the regional economy, and damage to private structures (including homes and businesses). Single -flood damage estimates for a failure of containment by these levees exceed $830 million. The economic disruption to the valley would be measured in years. Businesses with expensive and difficult to relocate or replace industrial machinery are particularly at risk. Because of these significant risks, improvements to this levee segment are a very high priority to the City of Kent and the King County Flood Control District. Work: The scope of this grant agreement focuses on the portion of the levee segment that is between River Mile 15.98 and 16.36. The Recipient shall perform the following work: 1 Scope of Work 1 Task 1: Project Coordination and Administration The Recipient will coordinate throughout the grant period with Ecology and other federal, state, local agencies, and Indian tribes. In its commitment to provide technical assistance throughout the grant period, Ecology will meet with the jurisdiction to present and discuss approaches to floodplain construction issues before work begins. This Task also covers expenses for the recipient to administer the grant including, but not limited to: contract monitoring; coordinating with the Corps of Engineers, FEMA, the City of Kent, and other parties; internal staff reviews; construction engineering management; etc. Cost: $500,000 State contribution: $500,000 Page 2 of 24