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

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ATTACHMENT A TO EXHIBIT B SUPPLEMENTAL TERMS AND CONDITIONS — RESOLUTION 2012 -02.2 1. The top of the setback levee retaining wall shall be consistent with the height of the adjoining levee sections, except as is appropriate for safety of cyclists, pedestrians and others using the trail along the top of the wall. Transitions at the ends of each wall shall provide for trail user safety and for levee erosion resistance from overtopping flows that might be concentrated around the ends of the wall and around the ends of trail user protection measures. 2. The City, or its engineering consultants, shall submit to the District a plan to provide for resiliency of the landside levee and wall in the event of overtopping. The plan shall include identification of the areas that are most susceptible to erosion, and shall propose appropriate protection measures for each of those areas. The City shall submit the plan as a recommendation for consideration and approval by the District in the Levee construction plan review process. 3. The City shall reduce and mitigate the potential for erosion. The City, or its engineering consultants, shall identify pefivanent or temporary strategies to minimize erosion in locations of potential erosion. The City shall submit these strategies as recommendations for consideration and approval by the District in the Levee construction plan review process. 4. If the City strategy to minimize erosion in the event of overtopping relies upon temporary erosion control measures such as sandbags, the City must commit to paying for and having on hand the materials and equipment, and access to sufficient labor, to install all temporary measures in preparation for overtopping. The City shall prepare a plan that describes the temporary measures, the staging .of material and equipment, sources of labor, estimated time for installation, and specific river conditions that will trigger installation. This plan must be submitted for consideration and approval by the District in the Levee construction plan review process. The City must also prepare before October 1 each year by staging all necessary materials and equipment specified in the plan. The City must fully install all such temporary measures immediately upon recognition that the trigger conditions in the approved plan are met. The City must also remove all such temporary measures within eight weeks after flood conditions subside. The City is fully responsible for all associated costs including but not limited to materials, equipment, and labor. 15 EC approved (RB -RK)