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Project Narrative <br /> For bank retention <br /> 1905 Concordia Street <br /> Orono, MN <br /> The strong storms at the end of May 2019 caused severe damage to the bank from the top to <br /> the bottom by the shoreline riprap. This type of erosion requires extreme effort to correct so it <br /> will stay in place for a long time. <br /> The plan is to use the Subterranean Timber Grid method. To get stability of the bank the <br /> existing soil will be removed to a depth of 4 feet. Next a series of 4 foot-high walls are spaced <br /> back away from the lake creating boxes of timer that are anchored vertically up the bank. <br /> A drainage system of rock and perforated drain pipe are place at the bottom of the boxes <br /> allowing the moisture to slowly find its way down to the riprap on the shore. <br /> The next step is to fill the boxes with good soil and create a slope from bottom top with all the <br /> timbers buried in the soil along the slope of the bank. With the soil in place landscape plantings <br /> will be installed and the whole work area is then covered the plantings as per the landscape <br /> plan and finally erosion control area the entire slope will be planted and then covered with <br /> shredded wood chips to hold the soil in place. <br /> This system has been used for about 30 years on Lake Minnetonka without failure. The <br /> locations where these methods were used are very hard to detect because they are totally <br /> covered with plantings that grow on and into the Subterranean Grid. <br /> Dale Gustafson <br /> Greendale Design <br />