Agenda - Council - 06/23/2026 - Laserfiche WebLink

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bituminous and 2.5-inches of aggregate base. No stormwater improvements, other than replacing existing street crossing culverts, are proposed with this project. 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. Proiect Scone The reconstruction is proposed to be a Full -depth Reclamation (FDR). This generally includes reclamation of the existing bituminous pavement and underlying aggregate base; flipping the reclaim, hauling out excess sand subbase material and scarifying the subbase; hauling off excess reclamation material (minimal due to hauling out subbase material); shaping and compacting the remaining reclamation material to be used as the new aggregate base; 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, but does typically impact 6 to 8 feet of adjacent boulevard and driveways. Three (3) of the eighteen (18) soil borings found silty sand. Though it's generally understood proper conditions can make use of this material as road subbase, previous projects with similar material have required removal and replacement after the material failed; after removal of the bituminous under the load of construction equipment. Because of this, and the marginal soil borings not being all grouped together, the plans include a contingency quantity for soil corrections, but no specific removals are called out in the plans. Staff explored performing a reclamation rehabilitation, however, the subbase material is not high enough quality for this to be effective. The new pavement section will include 6-inches of recycled reclamation material under 3.5-inches of new bituminous. Municipal utilities do not exist within the project area, extension of municipal utilities to this subdivision are not proposed as it is outside of the 2040 MUSA. Preliminary Schedule Remaininw • Council Awards Contract to the Lowest Responsible Bidder o June 23, 2026 • Contractor Begins Construction o Alter July 1, 2026 • Contractor Substantially Completes Construction o New bituminous pavement in -place, topsoil and seed in -place o September 4, 2026 • Contractor Final Completion o Verify final restoration; punch list created o October 2, 2026 The full plan set was not attached to this case due to file size constraints, however, plans are available for review upon request from the City Engineer. Notification: If City Council awards a contract for construction, letters will be mailed to property owners with updates on the project status. Engineering staff maintains City Improvement webpages with the most current project information. This can be found on the city website, Engineering Department page. Time Frame/Observations/Alternatives: