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U J Bonestroo £9 Rosene Anderlik& Associates Enginearf & Architects 2335 VHIest Highway 36 • St. Paul, MN 55113 Orfice. 651-636-4600 • Fax; 65I-636-I3II www.bonestroo.com December 7,2005 Mr. Michael Gaf&on Planning Director City of Orono Post Office Box 66 Crystal Bay, Minnesota SS323 Re: 3500 Watertown Road Subdivision File No. 000139-05000-0 Plat No. 05-3152 Dear Mike, We have reviewed the revised plans and preliminary plat dated 11-14-05 for the proposed 6-lot subdivision located at 3500 Watertown Road. The proposed improvements include grading, roadway construction and storm sewer improvements to serve the site. We have the following comments with regards to engineering matters; • The plat should show 5-foot drainage and utility easements along all interior lot lines and 10-foot drainage and utility easements along all right-of-way frontages and exterior lot lines. • Drainage and utility easements should be provided over all ponding areas, drainage ways and wetlands. • All storm sewers proposed outside of the right-of-way should have drainage and utility easements centered over the pipe. The easement should be a minimum of 10-feet in width and may need to be wider if the pipe is deeper than 5-feet Access easements should be provided to alt structures and storm sewer facilities outside of the right-of-way. • The storm sewer design should be revised so that only one pipe conveys flows to the outlet structure. The proposed pipe between CB-2 and STMH-I should be eliminated and a pipe constructed between CB-2 and CB-7. An additional catch basin should be provided on the west side of the road across the street from CB-7. • Final plans should include plan and profile views of all proposed storm sewers. • Final plans should include a drainage area map, ponding calculations and storm sewer calculations. The pond design must meet NURP standards. • Proposed elevations shown east of the road and west of the pond appear to be incorrectly stated by lO-fcet. The grading plan should be revised so the proposed elevations are shown correctly. • The proposed retaining wall shown east of the roadway near Watertown Road is at least 6- feet high in some locations. All retaining walls that exceed 4-fcct in height or two tiered walls that are not separated by a distance of at least two times the height of the wall require a separate engineered design and detail submittal. Final plans should specify proposed wall materials. • The plans show that the road construction will impact an existing wetland. It appears that St. Paul, St. Cloud, Rochester, MN ■ Milwaukee. Wl • Chicago, IL Alfimiallv* Actlon/BqM«l Op^riimlijf fniplo)f*r untf fmployct Owned