Agenda - Public Works Committee - 11/19/2024

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The only known sanitary or storm sewer improvements are located in the wetland area west of Nowthen Boulevard. Two corrugated metal pipe (CMP) culverts are proposed to be upgraded to reinforced concrete pipe (RCP). In addition, two sets of storm sewer inlets and outlets to the wetlands exist in this stretch. By raising the roadway, at a minimum the catch basin castings will need to be adjusted, but may need to be replaced depending on how high the road is raised. Any additional repairs will not be known until the sewer televising reports are reviewed. CIP level estimated project costs for IP 25-03 Alpine Drive Reconstruction are $1,121,573 (975,281 MSA Funds; $146,292 Stormwater Utility Funds). Any repairs to the sanitary sewer or watermain would be paid with the associated utility funds. IP 25-05 High Point Street Reconstructions: This project proposes to reconstruct the streets within the High Point and Section 22 Unplatted subdivision, generally located between Ramsey Boulevard and Zirconium Street, between 155th and 157th Avenues. The street within Section 22 ) (156th Un lattedAvenue are 26-foot p urban with bituminous curbing and rural with drainage swales at the low point. The streets within High Point are 30-foot urban section with bituminous curbing and cross street valley gutters with drainage flumes at low points. The streets total approximately 1.67 miles in total length, traffic counts have not been taken within the project area. Staff is proposing to replace the bituminous curbing with surmountable concrete curb and gutter. Where feasible storm sewer inlets and storm sewer piping will replace bituminous flumes and cross gutters to improve drainage. This will be further explored during project design. Review of the geotechnical report found clean sands, ideal for pavement support within the project area. Additionally, groundwater is not anticipated to be a concern for the street reconstruction. Staff is proposing a pavement section of 3.5-inches new bituminous pavement over 6-inches aggregate base. The existing pavement section ranges from 6 to 8-inches thick. To achieve the proposed pavement section, additional subsoil excavation of 2 to 3-inches will be required. During initial project review, staff identified the Zirconium Street cul-de-sac is in need of further discussion. The current City design standards require cul-de-sacs be built to a 100-foot diameter within a 120-foot right of way. The Zirconium Street cul-de-sac was built to a 165-foot diameter within a 200-foot diameter right of way. Placing the cul-de-sac back to this oversized diameter is financially undesirable, and staff proposes to explore several replacement options. Staff proposes bringing a separate case back to the Public Works Committee for further discussion once preliminary project costs for various options are known. CIP level estimated project costs for IP 25-05 High Point Street Reconstructions are $1,986,165 ($1,727,100 PM Funds; $259,065 Stormwater Utility Funds). IP 25-06 Sorteberg's Street Reconstructions: This project proposes to reconstruct the streets within the Sorteberg's subdivision, which are generally located east of Armstrong Boulevard, one block south of Central Park. The streets are 30-foot wide urban section with bituminous curbing and curb cuts at the low points. The streets total approximately 0.54 miles in total length, traffic counts have not been taken within the project area. Staff is proposing to replace the bituminous curbing with surmountable concrete curb and gutter. Initial review has shown depth is not available to place storm sewer inlets and piping at the low points, a combination of concrete valley gutters and flumes will be used for drainage at the low points. Review of the geotechnical report found clean sands, ideal for pavement support within the project area. Staff is proposing a pavement section of 3.5-inches new bituminous pavement over 4-inches aggregate base made up of recycled reclamation. The existing pavement section ranges between 7.4-inches and 10.3-inches in total thickness, to achieve the proposed pavement section additional subsoil excavation is not required. CIP level estimated project costs for IP 25-06 Sorteberg's Street Reconstructions are $642,890 ($559,035 PM