Agenda - Council - 10/24/2017 - Laserfiche WebLink

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements The scope of the proposed surface improvements is shown in Figure 1 in Appendix A. 4.1.1 Street Improvements All streets are proposed to be reconstructed with bituminous pavement and concrete curb and gutter, which will better facilitate drainage over time. Numerous streets exist throughout the City with bituminous curbing and almost all are deteriorating more rapidly than streets with concrete curb and gutter due to their inability to rapidly convey drainage off of the pavement surface, particularly along edges of streets. The proposed surface improvements are shown on Figure 1 in Appendix A. Street Design: 163rd Lane, Alpaca Street, Chameleon Street, and 164th Lane are currently urban residential streets with bituminous curb and pavement 31-feet wide from back -of -curb to back -of -curb. The cul-de-sac on 164th Lane is 100-feet in diameter from back -of -curb to back -of -curb. 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 drainage and storm sewer system will be improved by adding concrete curb and gutter, replacing bituminous flumes with concrete pipe systems, and providing additional catch basins along curb lines to reduce the width of stormwater encroachment onto the pavement surface during rainfall and snowmelt events. No stormwater treatment improvements are required for this project since the street is proposed to be reconstructed at its current width. 4.1.3 Geotechnical Considerations Braun Intertec completed a Geotechnical Exploration and Engineering Review including five (5) soil borings spaced at approximate 500-foot intervals along 163rd Lane, Alpaca Street, and Chameleon Street. The locations of the borings are shown in the Boring Feasibility Report The North Forty Reconstructions City of Ramsey Project No. 18-01 Page 8