Agenda - Public Works Committee - 10/16/2018

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements 4.1.1 Street Improvements 146th Avenue and Ferret Street are proposed to be reconstructed with bituminous pavement and bituminous curb. 147th Avenue is proposed to be reconstructed with bituminous pavement and concrete curb and gutter, which will better facilitate drainage over time. The proposed surface improvements are shown on Figure 1 in Appendix A. Street Desin: 146th Avenue, 147th Avenue, and Ferret Street are currently urban commercial streets with bituminous curb and pavement, 40 feet wide from face -of -curb to face -of -curb. The cul-de-sac on Ferret Street is 100-feet in diameter from back -of -curb to back -of -curb. Existing and proposed traffic counts are low for typical commercial streets. All street segments are proposed to be reconstructed at their current width. A typical section for the proposed pavement reconstruction improvements is shown in Figure 2 in Appendix A. City staff is proposing a pavement section design of 1.5 inches bituminous wear course, 2 inches bituminous base course, and a minimum of 6 inches of aggregate base composed of existing aggregate base and FDR reclaim material. This pavement section would be constructed over the existing subgrade and/or aggregate base after it is reshaped and compacted. 4.1.2 Storm Sewer Improvements The existing storm sewer system does not include storm sewer pipe. Storm sewer pipe will be extended west along 147th Avenue for future connection to the existing system. No stormwater treatment improvements are required for this project since the streets are proposed to be reconstructed at their current widths. 4.1.3 Geotechnical Considerations Braun Intertec was employed to complete a ground penetrating radar (GPR) analysis for the project area. This determined an average street pavement and base section thickness of 12.6 inches. Based on staff knowledge of the area and several soil borings taken for adjacent projects, City staff proposes completing a full -depth reclamation of the existing pavement resulting in a minimum of 6 inches of aggregate base composed of existing aggregate base and FDR reclaim material, and 3.5-inches of new bituminous pavement. The proposed improvements should have a service life of at least 30-years, assuming maintenance such as overlays, crack sealing and seal coating is routinely performed. Feasibility Report HY-10 Ramsey Street Reconstructions City of Ramsey Project No. 18-02 Page 8