Agenda - Council - 01/09/2024 - Laserfiche WebLink

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Proposed Improvements Staff review of the geotechnical report found generally sandy subsoils, ideal for both roadway embankment and utility support, throughout the project area. Because of this, subsoil corrections are not anticipated, and the full -depth reclamation (FDR) design process will be used. The proposed alignments and profiles of the streets are proposed to generally match existing alignments and profiles. However, Staff found the roadway curves and centerlines tend to meander within the right-of-way, which will cause the edge of pavement to move several inches horizontally, and up to a foot from existing in places. Additionally, Staff found the existing roadway crown varies significantly throughout the project, with some areas having no crown or unanticipated sections with super elevation where the entire street surface slopes in one direction. This project proposes to place a 3-percent crown throughout, which has become standard practice for rural street reconstructions in Ramsey to ensure adequate drainage will be maintained. The proposed pavement section is 3.5-inches new bituminous pavement over 4-inches aggregate base. The aggregate base will be made up of reclamation material. Driveway aprons will extend back approximately 8 feet to tie the driveways into the new pavement, materials are proposed to match existing. In general, the current swales along the streets within Halls Dover Acres are not proposed to be re -graded as part of this project. Staff is aware of standing water issues within the Radium Circle cul-de-sac, which are proposed to be addressed. Additionally, the existing swale at the northwest quadrant of 157th Lane and Radium Street has filled in over the years, completely covering the culvert. The soils are so well draining that water does not stand however, Staff must do grading work in the ditch for the new culvert to be properly installed. Otherwise, due to the nature of street reconstruction, the in -slopes of the swales along the pavement will likely be disturbed approximately 4 to 6 feet off the edge of pavement. No changes to the current drainage patterns are proposed. The existing culverts crossing the streets are proposed to be removed and replaced to ensure the culverts will remain functional through the proposed 60-year design life of the street. A 12-inch trunk watermain is proposed to be extended from the existing end of the main at Potassium Street, at the east edge of the Halls Dover Acres plat, and along 157th Lane to Nowthen Boulevard. From there, the watermain will follow Nowthen Boulevard to Sunfish Lake Boulevard, and connect to an existing trunk watermain stub off of the Sodium Way cul-de-sac. In total, the trunk watermain extension is approximately 2,100 lineal feet. Additionally, an 8-inch watermain line is proposed to extend down the Radium Street stub to the south, to serve future development to the south. Hydrants are proposed to be added at the corner of 157 th Lane and Nowthen Boulevard, 157th Lane and Radium Street, and at the end of the stub on Radium Street. Because Halls Dover Acres is not in the MUSA, the project does not propose to extend sanitary sewer to the subdivision. Staff has received some inquiries from residents whether water and sewer will be available for hook-up during the project, though no formal requests have been received yto date. Because the subdivision is not within the MUSA, sanitary sewer hook-ups would require a comprehensive plan amendment, and would delay the project beyond 2024 construction. There are some instances of properties within the City connecting to municipal water and not municipal sewer, staying on a private septic system, though it is not a common occurrence. Based on direction from the Public Works Committee, Staff mailed letters to the properties along the trunk watermain route to inquire if there is interest in connecting to municipal water. Preliminary Schedule Remaining • Council Approves Plans and Specifications / Authorizes Ad for Bids o January 9, 2024 • Staff Receives Bids o February 21, 2024 • Council Awards Contract to the Lowest Responsible Bidder o February 27, 2024 • Contractor Begins Construction o Spring 2024 • Contractor Substantially Completes Construction o Watermain construction in -place o New bituminous pavement in -place, topsoil and seed in -place