Agenda - Public Works Committee - 06/17/2025

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sections with concrete curb and gutter totaling 0.83 miles in length. There is no sidewalk in the subdivision other than the intersections with Dysprosium Street. Any pedestrian ramp updates would be tied to Dysprosium Street, rather than this project. Traffic counts have not been taken within the project area. Municipal sewer, water, and storm sewer exist within the project area. Utility testing will be performed during project design; utility improvements are not currently proposed. Storm sewer catch basin grouting and casting resets are typically performed with reconstruction projects. The streets within Flintwood Hills 2nd & 3rd were constructed between 1985 and 1987, no overlay has been performed on these streets. Ground Penetrating Radar (GPR) data taken prior to skim patching shows an average pavement section of 6.6-inches, including 2.5-inches of bituminous and 4.1-inches of aggregate base. The reconstruction is proposed to be a Full Reconstruction in the CIP. A Full Reconstruction typically includes removing and replacing the pavement and concrete curb and gutter, and building back a full street section. This results in greater impacts to adjacent boulevards and driveways, but all work will still be within the City -owned right of way. During project design, staff will review the existing concrete curb and gutter to determine if spot replacement would be sufficient. However, based on the GPR data there's not a thick enough existing pavement section to perform a typical FDR improvement, which will require additional subgrade excavation to create enough depth for the typical neighborhood pavement section. A Full Reconstruction is generally 30 to 40-percent more expensive than an FDR project. CIP level estimated project costs are $1,168,308 ($1,015,920 Pavement Management Funds, $152,388 Storm Water Utility Funds). IP 26-06 Riverside West Street Reconstructions: This project proposes to reconstruct the streets within the Riverside West subdivision, generally located along Dolomite Street and 137th Avenue south of Riverdale Drive. The 2026 Neighborhood Overlay Improvements currently include a mill and overlay of Ebony Street within the Riverside West subdivision. During design, staff will review the projects to determine if Ebony Street is truly an overlay improvement and if it would be more cost-effective to include it with this improvement or the 2026 overlay improvement project. The streets are 31-foot wide urban sections with concrete curb and gutter totaling 0.28 miles in length. There is no sidewalk on 137 th Avenue or Dolomite Street, but sidewalk exists along Ebony Street and the Riverdale Park trail crosses 137th Avenue at the west end of the project. Anoka County is improving the trail and pedestrian ramp on the south side of 137th Avenue in 2025. Municipal sewer, water, and storm sewer exist within the project area. Utility testing will be performed during project design; utility improvements are not currently proposed. Storm sewer catch basin grouting and casting resets are typically performed with reconstruction projects. The streets within Riverside West were constructed in 1992; no overlay has been performed on these streets. GPR data taken prior to skim patching shows an average pavement section of 8.6-inches, including 3.1-inches of bituminous and 5.5-inches of aggregate base. The reconstruction is proposed to be an FDR in the CIP. Soil corrections are not anticipated but this will be verified during design and review of the geotechnical report. Spot concrete curb and gutter replacement is anticipated. Staff are aware of a stretch of 137th Avenue in which the curb and gutter is tilting back and will require replacement of a minimum of 100 feet of curb and gutter. More investigation is needed to determine the cause. Because the existing concrete curb and gutter will generally remain in -place, adjacent driveway and boulevard impacts should be minimal. CIP level estimated project costs are $229,615 ($199,665 Pavement Management Funds, $29,950 Storm Water Utility Funds) . IP 26-07 Section 01 Unplatted Street Reconstructions: This project proposes to reconstruct the streets within the Section 01 Unplatted subdivision, generally located west of CSAH 7 and south of 179th Lane (CR 27). The streets are 24-feet wide with a combination of rural and urban sections with bituminous curbing. Much of the bituminous curbing appears to be placed to address localized drainage within the subdivision, and eventually runs to flumes and drainage ditches. The streets total 1.44 miles