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street segments. <br />Orchard Hills Townhomes subdivision does not have sufficient pavement thickness for a 2-inch mill and overlay <br />improvements, therefore a 1.0-inch mill and 1.5-inch bituminous overlay will be used. The section of Cobalt <br />Street between Alpine Drive and 152nd Lane is proposed to receive a full -depth mill and fill of approximately <br />3.5-inches. <br />Bowers Drive will receive a full -depth mill and overlay of approximately 3.5-inches. The bituminous will be <br />placed in 2 lifts. Additionally, some minor base corrections are anticipated to be required. <br />All remaining subdivisions have sufficient existing bituminous thickness to perform a 2-inch mill and bituminous <br />overlay. <br />Per typical overlay improvements, spot concrete curb and gutter repairs will be performed on damaged curb. <br />Where feasible, the City has switched to a saw & seal method for curb cracks at a significant cost savings. This is <br />performed on hairline cracks, without vertical displacement. For areas of bituminous curbing, repairs to the <br />curbing are not anticipated, though the City typically updates curb adjacent to storm sewer inlets to concrete <br />during mill and overlay projects. <br />Municipal sewer and water exist under all street segments in the project except for Bowers Drive. This project is <br />not proposing any repairs to watermain or sanitary sewer. <br />Minor storm sewer structure repairs, typically re -grouting catch basins, is proposed. Additionally, the project <br />proposes adding hydrodynamic separators to the storm sewer system along Bowers Drive for the two outlets to the <br />Mississippi River. The separators are a cost-effective TSS removal device, which is used in leu of infiltration <br />basins. Infiltration basins would require significant surface area, grading, and drainage easements which the City <br />do not currently have. <br />Four of the townhouse subdivisions include extensive pedestrian ramps which do not meet current American with <br />Disability Act (ADA) standards, and will require upgrades. A total of 50 pedestrian ramps were found to require <br />upgrades, and will be replaced during construction. <br />As an alternative bid item, this project also includes constructing the gravel segment of Basalt Street south of <br />141 A Avenue to a fulling paved street section including concrete curb and gutter. The street will be built to a <br />width of 36 feet, with parking on one side, and terminate in a cul-de-ac built to 66 feet in diameter. This is the <br />largest cul-de-sac which will flit in the existing right of way. Staff reviewed options for increasing the cul-de-sac <br />to the standard 100-foot diameter, but found it not feasible, largely due to the significant impacts on the existing <br />commercial adjacent to the street. The pavement will be built to a 10-ton pavement strength design which is <br />typical for industrial streets, this will be achieved by placing 4-inches bituminous on top of 6-inches aggregate <br />base. <br />Preliminary Schedule Remaining <br />• Council approves plans and specifications / authorizes advertisement for bids <br />o April 23, 2024 <br />• Staff receives bids <br />o June 3, 2024 <br />• Council awards contract to the lowest responsible bidder <br />o June 11, 2024 <br />• Contractor begins construction <br />o July 2024 <br />• Substantial Completion <br />o August 31, 2024 <br />• Final Completion <br />o September 30, 2024 <br />