Agenda - Public Works Committee - 06/17/2025

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At this time, no stormwater or soil correction improvements are anticipated for this subdivision, other than replacing existing street crossing culverts. This will be further explored during project design and review of the geotechnical report. As part of the PACT Charter High School development, residents on 163rd Lane had concerns about runoff from the High School overflowing the wetland in their rear yard, adjacent to the High School. The High School development has not been found to have a negative impact to this wetland, which during heavy rainfall events causes water to temporarily sit in the southern ditch of 163rd Lane. The water does not appear to stay in the ditch more than 48 hours and is maintainable in its current condition. These reconstructions are proposed to be Full -Depth Reclamation (FDR) improvements as identified in the CIP. This generally includes reclamation of the existing bituminous pavement and underlying aggregate base, flipping the reclaim and scarifying the sub -base (potentially with some removal of sub -base material to make space for new pavement section), hauling off excess reclamation material, shaping and compacting the remaining reclamation material to be used as the new aggregate base, and placing new bituminous pavement in two lifts. The road profile and alignment generally stay in the same location with some minor corrections to curves occurring, which typically impacts 6 to 8 feet of adjacent boulevards and driveways. If the geotechnical report identifies favorable subgrade materials and verifies the GPR results for pavement section thicknesses, this project may also be a candidate for reconstruction as a Reclamation. This would generally include performing the FDR, removing 2.5-inches of material, and placing 1-lift of bituminous pavement. The road profile and alignment are not adjusted and driveways are generally not impacted. The adjacent boulevard is typically only impacted about 1-foot off the edge of bituminous pavement, making it necessary to clear any vegetation within this area to avoid mixing vegetation in with the reclamation material. Costs are reduced by approximately 25 to 30-percent with a Reclamation project. However, the sub -base material and existing pavement section are critical components in determining when to implement a Reclamation project. CIP level estimated project costs are $844,560 ($734,400 Pavement Management Funds, $110,160 Storm Water Utility Funds) . IP 26-04 Countryside Estates Street Reconstructions: This project proposes to reconstruct the streets within the Countryside Estates subdivision, generally located east of Armstrong Boulevard (CSAH 83) and north of 173rd Avenue. The streets are 24-foot wide rural sections, totaling 3.17 miles in length. Traffic counts have not been taken within the project area. Drainage is handled through street crossing culverts and drainage swales adjacent to the streets, which generally carry runoff to existing wetlands and Anoka County Ditch No. 51. The streets within Countryside Estates were constructed in 1980 and received an overlay between 1995 and 2007. Ground Penetrating Radar (GPR) data taken prior to skim patching shows an average pavement section of 6.5-inches, including 3.2-inches of bituminous and 3.3-inches of aggregate base. Ditch No.51 crosses 176th Avenue and 176th Lane. Both culvert crossings have been replaced and are not proposed to be replaced as part of this improvement. Televising the lines to confirm their conditions will be performed. The remaining street crossing culverts within the subdivision are proposed to be replaced and updated with reinforced concrete pipe. Only minor grading of the ditches to tie into the new culverts is proposed. The reconstruction is proposed to be an FDR in the CIP. Soil corrections are not anticipated, and only typical impacts of the FDR project as previously discussed are proposed. This will be further explored during project design. CIP level estimated project costs are $2,231,046 ($1,940,040 Pavement Management Funds, $291,006 Storm Water Utility Funds). IP 26-05 Flintwood Hills 2nd & 3rd Street Reconstructions: This project proposes to reconstruct the streets within the Flintwood Hills 2nd & 3rd subdivisions, generally located east of Dysprosium Street between CSAH 116 and Nowthen Boulevard/CSAH 5. The subdivision also includes 142nd Avenue west of Dysprosium Street up to Flintwood Park. The streets are 30-foot wide urban