Agenda - Council - 11/13/2018 - Laserfiche WebLink

Home

4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements The street segments within the Wood Pond Hills and Chestnut Ridge neighborhood proposed to be reconstructed include 146th Avenue between Nowthen Boulevard and Junkite Street, Helium Street between Sunwood Drive and 146th Avenue, and Krypton Street from Sunwood Drive to its southern termini cul-de-sac. The scope of the proposed surface improvements is shown in Figure 1 in Appendix A. 4.1.1 Street Improvements The streets in Wood Pond Hills and Chestnut Ridge are proposed to be reconstructed to match their existing width of 30-feet. All damaged surmountable concrete curb and gutter is proposed to be removed and replaced in kind. A typical section for the proposed pavement street reconstruction improvements is shown in Figure 2 in Appendix A. The proposed reconstructed bituminous pavement design is designed to accommodate a 7- ton design in accordance with the City of Ramsey's design standards. City Staff is proposing a pavement section design of 1 V2 -inches bituminous wear course, 2-inches bituminous base course, over 4-inches of existing aggregate base material after reshaping and compacting the base. 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 a 60-year design life would typically be targeted for a reconstructed street, this project is not proposing a full street reconstruction due to the good condition of the majority of the existing 26-year old curb and gutter. Therefore, only the bituminous pavement is proposed to be reconstructed at this time as it may make sense to replace the pavement section at the same time the rest of the existing curb and gutter is replaced, which may be 30 or more years in the future. 4.1.2 Storm Sewer Improvements The existing storm sewer is in good condition and is not proposed to be improved. The only proposed storm sewer improvements include resetting catch basin castings and grouting the catch basins. No stormwater quality treatment improvements are required for this project since the street is proposed to be reconstructed at its current width. 4.1.3 Geotechnical Considerations Northern Technologies LLC (NTI) completed a Geotechnical Exploration and Engineering Review including ten (10) soil borings, generally evenly spaced along 146th Avenue, Helium Street, and Krypton Street. The locations of the borings are shown in the Boring Feasibility Report Wood Pond Kills & Chestnut Ridge Street Reconstructions City of Ramsey Project No. 19-03 11