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_ s <br /> Mr. John Linc Stine <br /> State of Minnesota Department of Natural Resources <br /> Page 2. <br /> 1991 Pre-existing flagstone blocks on the top level were <br /> replaced by pre-cast concrete retaining blocks to <br /> further improve stability, safety, and appearance. <br /> My observation of the retaining performance of the structure <br /> during 8 years has shown it capable to withstand buffeting <br /> by ice and high water at levels up to the 930. 43 ' elevation <br /> of 1986. <br /> Raising the level of the lakeside riprap will strengthen <br /> protection of the shore frontage from erosive forces . Lake <br /> traffic is one of the most destructive of these. The struct- <br /> ure has been reasonably maintainable and additional riprap <br /> will aid this objective. The structure is not impervious to <br /> passage of water. The arched alinement adds resistance to <br /> earth pressures by tightening the blocks . <br /> Also, I acknowledge that the features of the present struct- <br /> ure attributable to me are removable. To aid your evaluation <br /> of this matter, I will be pleased to supply any further <br /> information and explanation that I can. <br /> Respectfully, _ . <br /> George C. Swanbeck <br /> 1750 Shadywood Road <br /> Orono, MN 55323. <br /> Exhibits enclosed: <br /> 1. Road Access Map <br /> 2. Lot Location <br /> 3. Site Plan <br /> 4. Schematic Elevation <br /> 5, 6, 7 . _-��b�os <br />