Agenda - Council - 09/12/2017 - Laserfiche WebLink

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements The segment of Sunwood Drive between Ramsey Boulevard/CSAH 56 and Bunker Lake Boulevard/CR 116 is part of the City's Municipal State Aid System (MSAS). Any proposed improvements must therefore be designed and constructed in accordance with current Minnesota Department of Transportation (MnDOT) State Aid standards, which are generally based on the street's functional 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; Reconditioning Projects). 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. The general location and scope of the proposed improvements is shown in Figure 1 in Appendix A. 4.1.1 Street Improvements Sunwood Drive is proposed to be reconstructed at a width matching the existing 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 gutter is proposed to be removed and replaced in kind. A typical section for the proposed pavement reconstruction improvements is shown in Figure 2 in Appendix A. The proposed reconstructed bituminous pavement design must accommodate a 10-ton design in accordance with MnDOT State Aid design standards. City staff is proposing a pavement section design of 2 inches bituminous wear course, 2 inches bituminous base course, and 5 inches of base composed of stabilized full depth reclamation material. This pavement section would be constructed over the existing subgrade after reshaping and 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 Ramsey Project No. 17-00 Page 6