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city of Orono <br />Crystal Bay, MN <br />August 11, 1987 <br />If the soil material removed was to be replaced within the excavation, the <br />backfilled material would be more likely to erode than would undisturbed <br />material of the same slope. Soil material that is removed and replaced loses <br />the material cohesiveness provided by the surrounding soils. In order to <br />prevent erosion of the backfill material slope grades should be minimized. <br />The proposed grading plan indicates the elevation of Lake Minnetonka at <br />100 and the elevation at the walkout to be only 6 feet higher. The wave <br />height and runup should be considered before the proposed site grading plan is <br />approved. We recommend the City require the owner to provide a wave height <br />and run-up analysis before the proposed site plan is approved or that the <br />owner alter his plan so to address the eroding effects of wav-^s and wave runup <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />Michael C. Lynch <br />MCLici <br />Page 2. <br />5714e