Agenda - Public Works Committee - 01/17/2017

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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). The 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 or 8820.9946. 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. The scope of the proposed surface improvements is shown in Figure 1 in Appendix A. 4.1.1 Street Improvements Sunwood Drive is proposed to be reconstructed with bituminous pavement matching the existing width while still allowing for 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 pavement design must accommodate a 10-ton design in accordance with 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. This pavement section would be constructed over the existing subgrade after it is reshaped and compacted. 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 staff would typically target a 60-year design life for reconstructed streets, this project is not proposing to remove and replace all curb and gutter due to the good condition of the existing 20 year old curb and gutter. Therefore, it may make sense to replace this pavement section at the time the existing curb and gutter is replaced, which will likely be 30 or more years in the future. 4.1.2 Stormsewer Improvements The existing storm sewer system is in good condition and meets all current State Aid standards and is therefore not proposed to be improved. The only proposed storm sewer improvements include repairing catch basin castings as needed. No stormwater quality treatment improvements are required for this project since the street is proposed to be reconstructed at its current width. Feasibility Report Sunwood Drive Reconstruction City of Ramsey Project No.I7-00 Page 6