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t '� Bonestroo,Rosene,Anderlik and Associates,lnc.is an A//irmative Adion/Equal Opportunity Employer Bonestroo Principals Ot[o G Bones[roo,PE •Joseph C AndPrlik,PE • Marvin L Sorvala,PE • Richard E.Tumer,PE.• Glenn R.Cook,P.E.• 7homas E.Noyes,P.E.• Rober[G.Schunich[,P.E• C� Rosene Jerry A Bourdon.PE •Rober[W Rosene,PE and Susan M Eberlin.C PA,Senior Consultants A n d e r l i k & Associate Principals Howard A Sanford,PE • Keith A Gordon,PE •Rober[R Pfefferle,PE • Richard W.Foster,PE.•David O.Losko[a,PE.•Rober[G Russek,A.I.A.• Mark A.Hanson,PE.• Michael T.Rautmann,P.E.• 7ed K.Field,PE.• Kenne[h P.Anderson,FE.•Mark R.Rolfs.FE.• Associ�tes Sidney P Williamson,PE,L S • Robert F Kotsmi[h Of/ices:SL Paul,Rochester,Willmar and SL Cloud,MN• Mequon,WI Engineers & Architects April 4, 1997 Mr. Lyle Oman City of Orono P.O. Box 66 Crystal Bay, MN 55323 Re: Otto Residence BRA File No. 139-2041 Dear Lyle: We have reviewed the grading for the property owned by Phillip Otto, 41 16 Highwood Road, and have found that the finished grading does not conform to the previously approved plans. The previously approved grading plan was submitted in 5eptember of 1995. This plan proposed only minor filling below the 956 contour (see Exhibit 1). Our initial review concluded that the grading plan was acceptable and would have minimal effects on the storage capacity of the pond (see attached letter). The completed grading plan submitted in October of 1996 shows up to a six-foot depth of additional fill below the 956 contour. Also, it appears that the applicant has filled portions of the adjoining properties. The increase in fill is distinctly stiown near the existing maple tree, which has up to five feet of fill placed around it (see Exhibit 2). The north half of this lot is part of a storm water ponding area that provides storage for 3.4 acres of direct drainage and 16.5 acres of indirect drainage. This ponding area has a history of flooding problems due to an inadequate pipe outlet between the pond and Lake Minnetonka. Because it is unknown if this outlet pipe will ever be replaced, it is very important to maintain the storage volume of this ponding area. The amount of fill significantly lowers the storage ' capacity of the pond and would increase the potential of flooding the adjacent homes. To alleviate the potential flooding problem, the fill in the low area below the existing 954 contour must be removed. In addition to the increased fill, it appears that the grading has extended beyond the property lines. This fill must also be removed unless the adjoining property owner applies for a separate grading permit and it is approved by the City. 2335 West Highway 3G ■ St. Paul, MN 55113-3898 ■ G12-G3G-4G00