Agenda - Council - 01/08/2019 - Laserfiche WebLink

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements 4.1.1 Street Improvements The streets in Brookview Estates are proposed to be reconstructed by matching existing widths and elevations with bituminous pavement and ditch sections to carry storm water runoff to Ford Brook and the Rum River. The proposed surface improvements are shown on Figure 1 in Appendix A. Street Design: 173rd Avenue and Germanium Street are currently rural residential streets with ditch sections, 24-feet wide to the edge of pavement. The cul-de-sacs on 173rd Avenue and Germanium Street are 95-feet in diameter. Existing and proposed traffic counts are consistent with typical residential 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 4-inches of aggregate base composed of full -depth reclamation material. This pavement section would be constructed over the existing subgrade after it is reshaped and compacted. 4.1.2 Storm Sewer Improvements The existing ditch sections are in good condition. Re -shaping the ditches may be required due to construction, but ditches will be restored to existing grades. The existing driveway culverts are not anticipated to be replaced. No stormwater treatment improvements are required for this projects since the street is proposed to be reconstructed at its current width, however, Staff is proposing to add a treatment structure to improve storm runoff water going into Trott Brook. 4.1.3 Geotechnical Considerations Northern Technologies LLC (NTI) completed a Geotechnical Exploration and Engineering Review including seven (7) soil borings, generally evenly spaced along 173rd Avenue and Germanium Street. The locations of the borings are shown in the Boring Location Map in Appendix C of NTI's report, attached in Appendix C. NTI recommends prior to installing the aggregate base, the existing subgrade should be scarified and re -compacted to a depth of at least 12 inches. A proof roll test should then be performed to determine soft or unstable subgrade areas. If rutting or localized unstable subgrade areas are observed, those areas Feasibility Report Brookview Estates Street Reconstructions City of Ramsey Project No. 19-02 9