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<br />City of CenteNlf/e <br />Hidden Spring Pork <br /> <br />Page 2 <br />2/13/08 <br /> <br />Shoreline Stabilization <br />High winds and a fluctuating lake level coupled with late season plantings that had not yet taken root and <br />an inadequate wave break proved too much for some of the shoreline stabilization materials. Bonestroo <br />and Veit made a number of efforts to reinforce the design, adding a second bio-roll and eventually a double <br />snow fence wave break. <br /> <br />Bonestroo is committed to stabilizing the bank utilizing the originally designed materials suggested by Mr. <br />Thompson at no additional cost to the City. We believe this design can provide a reasonable level of <br />shoreline protection if given the ability to grow through a few seasons without being disturbed by large <br />wave action. Therefore, a substantial wave break would be installed to ensure the shoreline stays in place <br />as the plants grow and sink their stabilizing roots into the bank. <br /> <br />If the City wishes to have a more substantial shoreline stabilization system than originally contemplated, <br />Bonestroo has formulated a few different designs to better handle the conditions and would be happy to <br />present these to the Council and/or Parks Commission at an upcoming meeting. Implementing these <br />designs would require City cost participation for materials over and above the original design. Those <br />materials might include Rip Rap, Turf Reinforcement Mats and/or additional plantings. <br /> <br />Again, if this interests the City, we would be glad to present these designs and their associated costs. If <br />not, we will simply begin restoration utilizing the original design as weather permits in the spring. <br /> <br />Sincerely, <br /> <br />BONESTROO <br /> <br />~~~ <br /> <br />Mark Statz, PE <br />City Engineer <br />651-604-4709 <br /> <br />copy: Jeff McDowell - Bonestroo <br />MAH, EAT, DlE - Bonestroo <br />file <br />