2004/05/05 Council Agenda Packet

10 • 36"culvert and tidegate located at the abandoned DD6 pump station. Pipe is largely - non-functional because the pipe has collapsed, allowing dike material (rock and soil)to enter, plugging the pipe. Pipe should be replaced, slip lined,or in some other way repaired to provide the same function. Estimated cost for full replacement: $110,000 Estimated time for completion of task if work commences by 8/30/04: 9/30/04 • Tide gate alternatives on main dike at NE end of district This pipe has limited function as a result of being collapsed and is partially plugged with dike material. Engineering and permitting studies are recommended to evaluate the cost and feasibility of repair of this tide gate and/or installation of tidegates at alternative locations. Estimated cost for study: $10,000 Estimated time for completion of task if work commences by 6/1/04: 9/1/04 If conditions change the estimated costs and/or timelines by more than 25% or 6 months respectively, the management committee shall be informed and review projects to determine whether or not to proceed. B. On-Going Maintenance. Beyond the short term maintenance and repairs to the Facilities, the Parties propose to undertake on-going inspections, maintenance, and other actions during the term of this Agreement to facilitate a functioning flood control system. These activities include but are not limited to the following efforts performed on an annual basis or as needed based on annual inspections: Dike Maintenance • Annual mowing of the dike top and shoulders to allow access for maintenance, inspection and repairs. • Maintenance of a driveable surface on the top of the dike. • Repair of any dike sloughs that could threaten the integrity of the dike. • Undertake appropriate inspections of facilities to help identify any possible issues that require additional maintenance or repairs . Drainage Maintenance • Removal of beaver dams that block drainage ditches. • Occasional cleaning of drainage ditches. • Removal of sediment buildup in drainage pipes. • Repair and replacement of tidegates. • Undertake appropriate inspections of facilities to help identify any possible issues that require additional maintenance or repairs Estimated annual cost $15,000. C. Unforeseen or catastrophic failures In the event of unforeseen or catastrophic failures of the Facilities during the term of this Agreement, the Parties agree that it is in their collective best interest to develop a process to address any such issues. The types of unforeseen or catastrophic failures could include dike breaches, dike erosion, and major damage to tidegates or pipe collapse. However, it is impossible to predict where and of what order of magnitude this damage might be. Cost Share Agmt FinaLdoc Page 3 82