Agenda - Council - 04/14/2020 - Laserfiche WebLink

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1. EXECUTIVE SUMMARY City Improvement Project 20-01 proposes to reconstruct Variolite Street between Alpine Drive and 173'' Avenue. The street totals approximately 12,000 linear feet (2.28 miles) in length. A figure showing the location and scope of the proposed improvements is included in Appendix A. On December 10, 2019, the Ramsey City Council ordered this feasibility report which explores the necessity, feasibility and cost-effectiveness of the proposed improvements by examining the existing conditions, scope of the proposed improvements, design alternatives, estimated costs and available funding sources, and determining whether the improvements should be completed as proposed or in connection with other improvements. On September 10, 2019, the Ramsey City Council authorized Staff to execute proposals from Hakanson Anderson and Associates for the required topographic survey, and from Northern Technologies Inc. (NTI) for required geotechnical work. The NTI Geotechnical Report is included in Appendix D. In 2017, Variolite Street was included in the Ground Penetrating Radar Pavement Evaluation performed by Braun Intertec. This data provides bituminous and aggregate base thickness information. The Ground Penetrating Radar (GPR) Summary, as well as the street segment summary, detailing the pavement history, are included in Appendix C. Variolite Street is a Municipal State Aid (MSA) street, and as such must be reconstructed to current MSA design standards, which are regulated by the State Aid Division of the Minnesota Department of Transportation (MnDOT). Due to the MSA 9 ton road design requirements and the potential for heavy truck traffic on this route, Staff proposed improvements include a Stabilized Full Depth Reclamation (SFDR) with 4-inches of bituminous pavement placed over the top. Some areas of the road exhibit groundwater concerns, and will receive drain tile placed under the SFDR. The proposed typical section is included in Appendix A. Trunk utility improvements are proposed with this project including the replacement of existing 10-inch force main trunk sanitary sewer with 21-inch gravity trunk sewer, and the extension of 12- inch trunk watermain to 173'' Avenue. This work is consistent with the 2040 City of Ramsey Comprehensive Plan, and is proposed to occur with this project to prevent unnecessary road reconstruction in the future to install these utilities. The utility improvements will support future expansion of City sewer and water to the northern parts of the City. Stormwater is generally conveyed through ditches, with culverts at abutting side streets and low points. Several of these culverts will be replaced with this project. The engineer's opinion of probable project costs for completing the proposed improvements outlined in this report is $4,335,000. Estimated costs include 10-percent contingency costs, as well as 23-percent indirect costs for administrative, engineering, finance and legal costs. A summary of the engineer's opinion of probable costs is included in Appendix B. Feasibility Report Variolite Street Reconstruction City of Ramsey Project No. 20-01 1