10-11-2023 Council Packet - Laserfiche WebLink

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Prepared by: Bolton & Menk, Inc. PROPOSED IMPROVEMENTS 2024 Country Drive Improvements ǀ 0N1.125375 Page 3 Mobile Estates. Several existing catch basins have deteriorated and require full replacement. The deterioration has led to minor sinkholes that have been filled and patch by City staff until they can be replaced. Several of the roadside ditches have filled in with sediment and require routine maintenance and ditch cleaning. IV. PROPOSED IMPROVEMENTS Street Current pavement distress patterns indicate surface-level wear but no significant deterioration of the underlying bituminous pavement. Braun Intertec was retained to perform a thorough investigation of the existing bituminous pavement. Braun took 5 shallow soil borings and 5 pavement cores within the 2024 project area and summarized the findings in a Geotechnical Evaluation Report. The summary of findings indicate that there is 7”- 10.5” of existing bituminous pavement and that the pavement below the top 2.5” is still in good condition. A mill and overlay consists of replacing the top layer of existing bituminous pavement to a specified depth while preserving the existing material below. Based on the pavement age and current distresses, the proposed street improvement for Country Drive is a 3” Mill and Overlay. A depiction of the proposed street improvements is shown in Figure 2 and Figure 3 in Appendix A. In order to help prevent or delay reflective cracking through the new pavement, a bituminous underseal is proposed on the milled surface. This technique is a cost-effective way to prevent reflective cracking and is utilized in other metro area communities on mill and overlay projects. In addition to the mill and overlay, curb and gutter that is cracked, weathered, or heaved will be removed and replaced with new curb and gutter. This improves stormwater conveyance to catch basins and prevents the intrusion of stormwater into the roadway base. Watermain The existing ductile iron watermain is in good condition and is proposed to be left in place. Existing gate valves within the pavement will be adjusted up and down during construction. If the existing gate valve stack is chipped or broken it will be replaced. The project cost estimate includes replacement of broken gate valve stacks as needed. Sanitary Sewer The existing sanitary sewer network is in good condition and is proposed to be left in place. Existing city-owned sanitary sewer manholes in the pavement will receive new castings and be adjusted to the new pavement elevation. New castings will also be fitted with exterior chimney seals to prevent inflow and infiltration (I/I). Storm Sewer Existing storm sewer structures that are failing will be replaced or rehabilitated with the project. Additionally, any castings that are broken will be replaced. Roadside ditches that are Exhibit 2 – Mill and Overlay