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Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Engineers & Architects <br />March Ij, 1998 <br />Mr. Michael P. Gaffron <br />Senior Planning Coordinator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />Re: VVaade Subdivision <br />File No. 139-2340 <br />Bonesttoo. Rosene. Andefhk <tnd Associates, tnc ts Aftirm.^ti^e Action €cjui*i Opportunity Bmptcycf <br />Principalis Otto G B'*»ne5!roo. PF • Joieph C Anderlik. PE • \^»vvin L Sorval.r PE • <br />Richiird E Turner, Pi • Glenn I? Cook. PE • Robert G Schunicht. PE • Jerry A Bourdon. PE • ^ <br />Robert W Rosene. PE ^nd Susan M Ebenm. C PA Senior Consultants . . <br />Associate Pnncipt^fs Howard A. Sanford. PF • Keith a Gordon. PE • Robert R Pfefferle. PE • <br />Richard W Foster. PE • Dav.d O LosVota PE • Robert C RusseK A IA • Vark A Hanson. P.E. • <br />Michael T Rautmann. PE • Ted K Field. PE • Kenneth P Anderson. PE. • Mark R Rolfs. PE • <br />Sidney P Williamson. PE.. L S • Robert F Kotsmith <br />Offices Sr ®aui Rochester. Wiiimar and St Cloud MN • Milwaukee Wl <br />. ^ • <br />:t\o 0 0 <br />^1, ' <br />• ^ * <br />J.t » <br />We have reviewed the preliminary grading plan and revised plat for the proposed two lot Waade subdivision. The site <br />is located at 3280 and 3290 Northshore Drive (C.R. 51) east of Tonkawa Road (C.R. 135) in the southeast quarter of <br />Section 8. We have the following comments in regards to engineering matters. <br />1. Access: Tlie width of Outlet A is shown at 40 feet where City code requires a minimum width of 50 feet. The <br />driveway shown north of Outlet B should be paved to a minimum of 12 feet in width; the driveway is currently shown <br />at 10 feet in width. ITie pavement south of the proposed house should be enlarged to allow for turning movements. The <br />flic dcparlinetu should review the plans and provide comments. <br />2. Utilities: Ple:ise .see our January 30, 1998 comments as they still apply. <br />3. GraJin.q: The proposed grading and erosion control plan sitows a ponding area located south of the proposed <br />ivvinliome. 1 he gi uling pl.vi also shows an emergency overflow elevation of 933.20. If the pond outlet becomes plugged <br />and the water rises to this overflow elevation, the existing homes east of the site will experience some flooding. We <br />recommend revising the gtading plan so that in the event of a plugged pond outlet the water will be directed away from <br />homes and toward the lake. The proposed grading in the southeast corner of the site is within 3 feet of an existing home <br />with slopes exceeding 3:1. We recommend that the grading plan be revised so that slopes do not exceed 3:1 and grading <br />is minimi/.ed near any existing structure*:. <br />4. Drainage: We recommend that storm sewer be no smaller than 12-inches in diameter. A drainage area map, storm <br />.sewer and ponding calculations showing pre and post development conditions should be submitted for review. <br />3. L ;'.ppca: j ;!;r.t :h? proposed utility easement shown along the west lot line does not cover the existing <br />sanitary sewer. An easement 20 feet wide centered on the existing sewer should be shown on the plat. <br />6. Financial Guarantee: When the plai:s have been ''ompleted we will prepare an estimate of the total cost for the site <br />improvements to determine the amount of the financial guarantee required. <br />Please contact me at (604-4863) if you have any questions regarding this matter. <br />Yours very truly. <br />BONESTROO. ROSENE. ANDERLIK & ASSOCIATES. INC. <br />l oi'.’ .Kellogg <br />Cc: Greg Gapp.a, City uf Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636-4600 ■ Fax; 612-636-1311