Agenda - Public Works Committee - 03/21/2017

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1. EXECUTIVE SUMMARY City Improvement Project 17-02 proposes to reconstruct four street segments within the Rivers Bend residential neighborhood including 147th Lane between Xkimo Street and Waco Street, 148th Avenue between Yakima Street and Xkimo Street, Xkimo Street between 147th Lane and 149th Avenue, and Yakima Street between 148th Avenue and 149th Avenue. These streets total approximately 2,774 linear feet (0.53 miles) in length. A map showing the location and scope of the proposed improvements is included as Figure 1 in Appendix A. These street segments in the Rivers Bend neighborhood were constructed in 1985 with between 2 inches and 3.25 inches of bituminous pavement, 4 inches class 5 aggregate base, surmountable concrete curb and gutter, and concrete storm sewer. The street was constructed to a width of 30 feet from face -of -curb to face -of -curb, and is centered within a 60 foot wide right-of-way. The storm sewer system consists of catch basins which drain runoff from the street to 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, these street segments within the Rivers Bend neighborhood were rated with PASER ratings of 3, which indicates this street is past the point of applying mill and overlay improvements. The current condition of these streets requires City staff to patch the streets 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 Full Depth Reclamation, or FDR. For this project, the FDR process would involve milling the entire existing bituminous pavement section, along with about 1 inch of the existing aggregate base. This reclaim material would then be placed on top of the reshaped and compacted subgrade, after which 3.5 inches of bituminous pavement would be placed on top. This would result in a 7-ton pavement design, which is a typical design for residential streets. The existing storm sewer system is in good condition. Only casting adjustments are proposed. The engineer's opinion of probable costs for completing the proposed improvements on Rivers Bend as outlined in this report is $283,000. 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 44 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. A total of twelve pavement corings were completed by WSB and Associates (WSB) to assist with the preparation of this report. WSB offered pavement design recommendations which were considered and incorporated to varying degrees while preparing this report. A copy of WSB's report is attached in Appendix D. Feasibility Report Rivers Bend Street Reconstructions City of Ramsey Project No. 17-02 Page 1