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City of Orono <br />Orono, MN <br />Re: File No. 13933 <br />May 19, 1988 <br />There is no overland drainage route for the Sauers backyard that would provide <br />a safety valve. The water ponded to an elevation of 952 (approximately) dur- <br />ing the July 1987 storm. This is not acceptable because of the property dam- <br />age resulting from the high water. We would recommend that Option I (Alter- <br />nate I) as outlined in the preliminary report be followed. This Option would <br />provide better water quality being discharged into Lake Minnetonka for small, <br />more frequent storm events. This Option would provide the capacity for hand- <br />ling the major storm events with only a small loss in water quality. The risk <br />for property damage is also reduced with Option I. <br />The City may desire to obtain a drainage easement over the Sauer property as a <br />part of this project. This would allow the City to control use of the ponding <br />area. The project costs do not include easement costs for the ponding area or <br />the outfall line. <br />Any of the three Options proposed would provide an acceptable method of hand- <br />ling the storm water discharge. We would recommend that. Option I be construc- <br />ted if the project is to proceed. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK 6 ASSOCIATES, INC. <br />Glenn R. Cook <br />GRC:li <br />Page 2. <br />24 <br />