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Mr.Roger Schmidt <br /> September 2, 2016 <br /> Page 5 <br /> Year/ Description of Conditions / Events <br /> Time Frame <br /> 2014 (June) • Flooding causes flow to overtop the Cache La Poudre bank, flood the <br /> F Street agricultural field and breach a section of the Boyd-Freeman <br /> Ditch pipeline and its embankment. <br /> o Major deposition of eroded material occurs on the east side <br /> (Al side) of the pipeline breach. <br /> o Major erosion/headcutting occurred on the F Street <br /> agricultural field. <br /> o The headcut advanced from the breach through the F Street <br /> agricultural field and to within approximately 150 feet east of <br /> the concrete path located east(on outside bend) of the river. <br /> 2015 • The CityBIC contracted with Olsson Associates to develop a design <br /> for temporary repairs associated with the breached pipe embankment. <br /> The temporary repairs include the following: <br /> o Riprap armor across the width of the breach which remains <br /> open. <br /> o Installation of a new siphon for the pipeline below the grade <br /> of the breach invert. <br /> o Installation of sheet pile across the width of the breach. <br /> o (Note: The temporary repairs described above will be <br /> removed after repairs and regrading of the F Street property <br /> occurs and the pipeline is restored to its historic grades). <br /> • In addition to the temporary repairs at the embankment breach <br /> location, the City also installed sheet piling on the eastern side of the <br /> concrete bike path to protect against future headcutting advancing to <br /> the west of the bike path. <br /> • Total cost for both projects (breach repair and installation of sheet <br /> piling at bikepath): approximately$900,000. <br /> 2015 (May) • A breach occurs in the west side of the Iverson/Martin Marietta Pit, <br /> forming a direct connection between the river and the pit. During a <br /> field visit on June 22, 2015, flow from the Cache La Poudre River <br /> was split roughly in half between the river channel and flow through <br /> the pit. <br /> • Three exit points exist for water flowing from the Iverson/Martin <br /> Marietta Pit to return to the river. Two of the exit points direct flow <br /> eastward, across the Boyd-Freeman Ditch wasteway toward the F <br /> Street agricultural field. The third exit point directs flow from the <br /> east side of the pit northward into the river. <br />