Agenda - Council - 05/23/2023 - Laserfiche WebLink

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are also free draining materials. The clayey soils are considered undesirable materials, and are proposed to be replaced with 2 feet of select granular material on top of geotechnical fabric. Generally, these subsoil corrections are proposed along 164th Avenue, the northern portion of Germanium Street, and 161st Avenue connecting into the Estates of Silver Oaks subdivision. Additionally, the southern portion of Germanium Street and adjacent 161st Lane was found to have a high-water table, which seasonally impacts the strength of the pavement section. The project proposes to raise the elevation of the pavement approximately 1-foot to allow the pavement section to be dry during seasonally high-water. In the areas not requiring corrections, Staff is proposing to use a pavement section made up of 6-inches in -place reclamation material below 3.5-inches of new bituminous pavement. This project proposes to remove the stub street at the comer of Dysprosium Street and 161st Lane, and create a true corner, since the development of the adjacent Scout Camp property is not currently proposed to occur. In general, the current swales along the streets are not proposed to be re -graded as part of this project. Due to the nature of subsoil corrections, and raising the profile of the pavement, some areas of the project will have impacts to the in -slopes between the pavement and bottom of the swales. 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. Due to the subsoil corrections, drain tile will be added in the low areas to properly drain the pavement subbase. The drain tile is proposed to drain into the existing swales. Anticipated Build Process • Install traffic control and erosion control measures o These are maintained throughout the project • Project removals o Perform subsoil corrections • Remove excess reclaim material, shape and compact remaining material o In non -correction areas, 6 inches of reclaim material is proposed to remain in -place o Excess reclaim is stockpiled and will be used on future City projects • Remove and replace storm culverts crossing the streets • Place aggregate base in subsoil correction areas • Raise grade as required in high ground water area o Near intersection of Germanium Street and 161st Lane • Place first lift of bituminous pavement • Finish driveway repairs • Restore the boulevard in any impacted areas o 2 inches topsoil, seed and hydro -mulch • Traffic control devices are removed as the project allows • Place the final lift of bituminous pavement • Erosion control measures are removed after restoration has been complete and new turf is established Preliminary Schedule Remaining • Staff Receives Bids o May 19, 2023 • Council Awards Contract to the lowest responsible bidder 0 May 23, 2023 • Contractor begins construction o June 2023 • Contractor Substantially Completes construction o September 1, 2023 • Contractor Final Completion (verify final restoration, punch list created) o September 29, 2023 The proposed improvements are designated as City Improvement Project #23-05, Barthel's Rum River Acres 2nd Street Reconstructions. Notification: