Agenda - Public Works Committee - 09/19/2017

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4.PROPOSED IMPROVEMENTS 4.1Streetand Stormwater Improvements The segment of Sunwood Drive betweenRamsey Boulevard/CSAH 56 and Bunker Lake Boulevard/CR 116ispart of the City’s Municipal State Aid System (MSAS).Any proposed improvements must therefore be designed and constructed inaccordance with current Minnesota Department of Transportation (MnDOT) State Aid standards,which are generally based onthe street’sfunctional classification,projected traffic volume, design speed, lane designations and widths, and proposed pedestrian facilities. Based on the proposed design,Sunwood Drive must be reconstructed in accordance with State Aid Rule 8820.9936(Minimum Design Standards, Urban; New or Reconstruction Projects) or 8820.9946(Minimum Design Standards, Urban; ReconditioningProjects).This will depend on the percentage of damaged curb and gutter that needs to be removed and replaced, which will be determined during final design.If more than 20 percent of the existing curb and gutter needs to be removed and replaced, the minimum design standards for State Aid Rule 8820.9936 must be followed. Otherwise, State Aid Rule 8820.9946 will govern. Figure 1 Appendix The general location and scope of the proposed improvements is shown in in A . 4.1.1Street Improvements Sunwood Driveis proposedto be reconstructedat a width matching theexisting width which permits on-street parking along both sides of Sunwood Drive. This design will meet current State Aid standards. All damaged B618 concrete curb and gutteris proposed to be removed and replacedin kind.A typical section for the proposed Figure 2Appendix A. pavement reconstruction improvements isshown in in The proposed reconstructed bituminous pavement design must accommodate a 10-ton design in accordance with MnDOT State Aid design standards. City staff is proposinga pavement section design of 2inchesbituminous wear course, 2 inchesbituminous base course, and 5 inches of base composed of stabilized full depth reclamationmaterial.This pavement section would be constructed over the existing subgrade after reshapingand compacting. The proposed pavement design should result in a minimum pavement life of 30 years, assuming that proactive, regular pavement maintenance treatments are performed during the life of the pavement.While a 60-year design life would typically be targeted for a reconstructed street, this project is not proposing a full reconstruction due to the good condition of the majority of existing 20 year old curb and gutter. Therefore, only the aggregate base and bituminous pavement are proposed to be reconstructed at this time. At the time the rest of the existing curb and gutter needs to be replaced,which may be 30 or more years in the future, Staff will evaluate the condition of the existing pavement section and the existing utilities to determine what improvements are needed at the time, if any. Feasibility Report Sunwood Drive Reconstruction City of RamseyProject No. 17-00 Page 6