Agenda - Council - 02/26/2024 - Laserfiche WebLink

Home

trunk watermain along 157 th lane from Potassium Street to Nowthen Boulevard as part of a trunk system loop. This trunk watermain extension is proposed to occur as part of this project. 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 alignments and profiles of the streets are proposed to generally match existing conditions. However, the streets and centerlines tend to meander within the right-of-ways. This will cause the edges of pavement to move several inches horizontally, and up to a foot vertically, from existing conditions. Additionally, the existing roadway crown varies significantly throughout the project, with some areas having no crown or unanticipated super elevation across the surface of the street. This project proposes to construct a crowned pavement section with 3-percent cross slopes throughout, which has become typical practice for rural reconstructions in Ramsey. The proposed 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 go back approximately 8 feet to tie the driveways into the new pavement and 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. This is to ensure the culverts will last at least 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 line at Potassium Street, at the east edge of the Halls Dover Acres plat, 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 watennain extension is approximately 2,100 lineal feet. Additionally, an 8-inch watennain 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, 157t11 Lane and Radiurn 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. During project design, Staff sent a letter to the properties along the trunk watermain route, inquiring if there is interest in connecting to municipal water. No requests for connection were received. Preliminary Schedule Remaininw • Council Awards Contract to the Lowest Responsible Bidder o February 26, 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 o August 2, 2024 • Contractor Final Completion o Watennain testing complete o Verify final restoration; punch list created o August 30, 2024