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�� �M�- ...� , , � �_ � March 14, 2005 Department Approval Manager Approval Agenda Section . ,��r , �-. --- f �`�¢�� . ,��r-' � �� _ I t e m Description: , South C)wasso Street Reconstruction I. BACKGROUND South Qwasso Boulevard was proposed to be reconstructed over the course of two construction seasons. Phase L• between Rice ion was originally scheduled for 2005 & 2006 respectively. Public Works and �'a�'Street and the railroad tracks, Phase ��: between the railroad tracks and Dale Street. Recreation staff have been working on identifying design alternatives for the phase I reconstruction project and how it relates to Ladyslipper Park. In order to compare costs for the street project and the park project, we have worked on two different design alternates. These are as follows: (1)Ex�s#in� ali�nment: This proposal is the reconstruction of the street on the current alignment. We would include some traffic calming through medians, stop signs and street tree planting. A pathway/ sidewalk is proposed along the new street along with storm sewer improvements for Lake Owasso. (2) Reali�nment: This proposal would realign the road through the city parcels located south of the road between Matilda and Marion Street. Due to organic soil deposits in this area, the new street construction will have additional costs associated with it. These costs effect both the construction and longevity of the new road. There are two methods that we can use to build a road on these soils. One method is to surcharge the soils; in this method, the organic soils are left in place and compressed for a number of months. Another way to do this is through excavation; this would be the removal of the full depth of organic soils and the reconstruction of the road subbase. We have estimated the up front construction costs for both of these construction alternatives, and will identify the long term impacts to the street. Additional geotechnical engineering and soil stabilization will be necessary to construct the road in a new alignment. Realignment also impacts the pathway and storm sewer improvement costs.