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

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements 4.1.1 Street Improvements The streets in Ford Brook 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, due to the observed presence of clay at the pavement surface, full - depth reclamation is not proposed. The proposed surface improvements are shown on Figure 1 in Appendix A. Street Design: 180th Lane and Krypton Street are currently rural residential streets with ditch sections, 24- feet wide to the edge of pavement. The cul-de-sac on Krypton Street is 85-feet in diameter. Existing and proposed traffic counts are consistent with typical residential streets. 180th Lane and Krypton Street mainline street segments are proposed to be reconstructed at their current width. The Krypton Street cul-de-sac is proposed to be reconstructed to a diameter of 100-feet. This will bring the cul-de-sac up to current City standards and allow school buses to use the cul-de-sac. Anoka -Hennepin School District can no longer stop on Highway 47 to pick up or drop off students. 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 course. This pavement section would be constructed over 2 feet of imported select granular subgrade after it is shaped and compacted. The select granular is placed on top of geotextile fabric which will help keep the select granular from being contaminated by clay subgrade materials. 4.1.2 Storm Sewer Improvements The existing ditch sections are in good condition. Re -shaping the ditches will be required due to the subgrade soil corrections, but ditches will be restored to existing grades. The existing driveway culverts are not planned to be replaced. No stormwater treatment improvements are required for this project since the streets are proposed to be reconstructed at their current width. 4.1.3 Geotechnical Considerations Braun Intertec, Inc. (Braun) completed a Geotechnical Exploration and Engineering Review including two (2) soil borings, located mid -block 180th Lane and the Krypton Street cul-de-sac. The locations of the borings are shown in the Boring Location Map in the Appendix of Braun's report, attached in Appendix C. Braun recommends completing a 6- Feasibility Report Ford Brook Estates Street Reconstructions City of Ramsey Project No. 19-01 9