09-22-1997 Council Packet - Laserfiche WebLink

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1/1 Bonestroo Rosene vS Anderlik& Associates Engineers & Architects Bonestroo. Rosene Anderhk and Aaocu^tes. tnc is an Affirm^ive Action Equ.^t Opportunity Employer Principals Otto G Bonestroo PE • Joseph C Anderlik PE • MiVv»n L Sorvaia. PE • Richard E Turner. PE • G»enn R Cook. PE • RoOert G Schunicht PE • Jerry A Bourdon. PE • Robert W Rosene PE and Susan M EDerlin. C PA . Senior Consultants Assocuite Principals Ho^vard A Sanford. PE • Keith A Gordon PE • Robert R Pfefferie. PE • Richard W Foster PE • David O Loskota. PE • Robert C Russek A I A • Vark A. Hanson. PE • Michael T Rautmann. PE • Ted K Field. PE • Kenneth P Anderson. PE • Mark R Rolfs. PE • Sidney P 'JViiiiamson. PE. RS • Robert F Kotsmith Offices St Paul. Rochester. WiUmdr and St Cloud. MN • Milwaukee Wl June 11,1997 Mr. Michael P. Gaffron Assistant Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 j\jU Re: ^Tiitehead Subdivision File No. 139-1619 Dear Mike, • _ We have reviewed the preliminary plat and sketch plan for the proposed Whitehead subdivision. The property is generally located south of the Luce Line, north of Lyman Avenue and east of Smith Avenue in the southwest quarter of Section 35, and the northwest quarter of Section 2. There are several significant issues that need to be addressed relative to engineering matters and included with the plan. 1. Streets: Lyman Avenue presently exists as a 12-foot to 15-foot wide paved access from Smith Avenue to ^proximately 900 feet east. From approximately 900 feet to 1800 feet east of Smith Avenue, Lyman Avenue exists as a 12-foot wide gravel access. There is no existing turnaround or cul-de-sac on Lyman Avenue. Five homes are presently served by the gravel portion and an additional three homes are served by the paved portion of the road. The present access is not acceptable from an engineering standpoint and would limit the ability to provide access for fire and emergency vehicles. If the proposed development is to proceed, we would recommend that the developer be responsible for the upgrade of Lyman Avenue to private street standards, from Smith Avenue to the drivevvay location of Lot 3. A cul-de-sac should be constructed at this location, requiring that the existing 8-inch culvert be replaced. Widening of Lyman Drive should be to the north of the existing alignment due to trees and existing topography. The access point for Outlot B onto Lyman Avenue has poor site distance and should be reviewed. The City code specifies a maximum length of 1000 feet and ten units on a cul-de-sac. All streets require a 30-MPH design speed and a 275-foot centerline radius. No more than two units may be served from a private driveway. Private streets serving three to seven units must be paved 24 feet wide, more than seven units require 28 feet. All streets require 50 feet of right-of-way. Due to the existing house locations and topography on the site it would be impossible to meet all of the code requirements. A shorter centerline radius could be mitigated by placing curve ahead warning signs at both ends of the curve. A 20-foot paved surface may be an acceptable access if a variance is granted by the City. Public safety issue will need to be addressed. The fire department should review the plans and provide comments. 2.Grading: Constructing the proposed mound systems, houses, and driveways will require nearly complete clearing and grading of the property. Due to the length of the driveway on Outlot B it should be constructed to a 20-foot width to provide access for fire trucks. The grading for this driveway will likely require an 8-foot tall retaining wall. The wall should be designed by a registered engineer. The driveway 2335 West Highway 36 • St. Paul, MN 55113 ■ 612-636-4600 ■ Fax: 612-636-1311