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Bonestroo �335 West Highway 3G • St. Paul, MN 55113 � Rosene Office:651-G3G-4G00 • Fax: G51-G3G-1311 _ Anderlilc& www.bonestroo.com Associates Engineers&Architects November 9, 2005 Ms. ,lanice Guncl(ach P�1i117�C City of Orono Post Office Box 66 '>� Crystal Bay, MN 55323 Re: 3848 North Shore Drive Pile No. 000139-05000-0 Plat No. OS-3 I 61 Dear Janice: We have reviewed the site plans and preliminary plat dated 10/19/OS for the proposed improvements at 3848 North Shore Drive.The plans propose to suUdivide three existing lots into a.five lot single family subdivision.The existing plat area is 3.85 acres with 0.08 acres of wetland for a total of 3.77acres.of net plat area. We have the following connuents with regards to engineering matters: • The proposed retaining walls exceed 4-feet in height in many areas and approach 10.5-feet in height in sotne areas, lt is unlikely the wall as shown can be constructed along Outlot B on the subject property without obtaining easements from the property owner to the west. A separate engineered design and detail submittal is required for all walls that are greater than 4-feet in height. • The driveway shown across Lot 1 to service Lot 3 exceeds 10% from the street to elev. 946.00. A 50-foot landing area with grades of less than 2%should be provided at the access onto North Shore Drive. • Plans should include provisions for storm water rate control and water quality.Ponding calculations,dt•ainage area maps and drainage calculations for the entire site should be provided for review and approval. • The plans note that several lots will be custom graded by the builder.This is a concern as drainage issues will likely arise as each lot is graded.We recommend that a grading plan be submitted for the entire site or each lot will need to submit a grading plan for review and approval prior to obtaining a building pennit. • The sanitary sewer service should not be connected to the existing manhole. The two services shown will need to be connected to the existing sewer pipe. • The plan indicates that ti�e total area disturbed will be 0.30 acres. If one acre is to be disturbed then the final plans will need to include a detailed temparary and pertnanent erosion and sedicnent control plan as required by the NPDES permit application. � ;iie cc�nstructioci uelails shown are not the cify sian�lut�d deiails.Sl�eei Co"-i should be reviseu to snow ti�c ciiy standard details. • When the final plans are completed and approved we�vill prepare a cost eslimate for the site itnprovements as a basis for the financial guarantee required. If you have any questions or need any clarifcations please contact me at(651)604-4863. Yours very h-uly, BONCSTROO,ROSEN�,AND�RLIK sc ASSOCIATES, fNC. , __.....� � �G�ii' ;� . � _.._—=' Tom Kellogg Cc: Greg Gappa,City of Orono St. Paul, St. Cloud, Rochester, MN ° Milwaul<ee, WI • Cl�icago, IL AfFirmative Ac[ion/Equal Opportunity Employer and Employee Owned' �