Agenda - Council Work Session - 02/14/2017

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1. EXECUTIVE SUMMARY City Improvement Project 17-00 proposes to reconstruct Sunwood Drive between Ramsey Boulevard/CSAH 56 and Bunker Lake Boulevard /CSAH 116 which totals approximately 3,050 linear feet (0.58 miles) in length. A map showing the location and scope of the proposed improvements is included as Figure 1 in Appendix A. This segment of Sunwood Drive was constructed in 1996 with 3.5 inches bituminous pavement, 5 inches class 5 aggregate base, B618 concrete curb and gutter, and concrete storm sewer. The street was constructed to a width of 40 feet from face -of -curb to face -of -curb, and is centered within an 80 foot wide right-of-way. The storm sewer system consists of numerous catch basins which drain runoff from the street to adjacent low-lying areas using concrete storm sewer pipes. City staff evaluates and rates the condition of pavement sections on all city streets on an annual basis using the Pavement and Surface Evaluation Rating (PASER) system. In the fall of 2016, this segment of Sunwood Drive was rated with PASER ratings of 3 and 4, depending on location, which indicates this street is past the point of applying mill and overlay improvements. The current condition of this street requires City staff to patch the street at least once per year, particularly before winter so the street can be plowed without further damaging the pavement in the process. Pictures of this street segment are located in Appendix A. Proposed improvements include removing and replacing all damaged concrete curb and gutter sections, and reconstructing the existing bituminous pavement section using a process called Stabilized Full Depth Reclamation, or SFDR. For this project, the SFDR process would involve milling the top 3 inches of existing bituminous pavement and disposing of the millings off site. The remaining 1-plus inch of existing bituminous pavement would then be ground up and mixed with 2 inches of the existing aggregate base. This reclaim material would then be placed on top of the reshaped and compacted subgrade, after which an asphalt emulsion stabilizer would be injected and mixed into the reclaim material. This stabilized reclaim material would be placed and compacted on top of the subgrade, then 4 inches of new bituminous pavement would be placed on top. This would result in a 10-ton pavement design meeting current State Aid pavement design standards. The existing storm sewer system is in good condition and based on preliminary review appears to meet all applicable current State Aid design standards so no improvements are proposed. An off-street 10 foot bituminous bike trail exists along the north side of Sunwood Drive and is in relatively good condition so no improvements are proposed with this project. The engineer's opinion of probable costs for completing the proposed improvements on Sunwood Drive as outlined in this report is $607,000. Estimated costs include 23% indirect costs for administrative, engineering, finance and legal costs. A summary of the engineer's opinion of probable costs is included in Appendix B. A total of 9 parcels have been identified as receiving special benefit from the improvements. These parcels are identified in the preliminary Assessment Map and Roll which are attached in Appendix C. Feasibility Report Sunwood Drive Reconstruction City of Ramsey Project No. 17-00 Page 1