Agenda - Public Works Committee - 10/16/2018

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Proposed improvements include reconstructing the existing bituminous pavement section using the Full Depth Reclamation (FDR) process. This process generally involves reclaiming the entire existing bituminous pavement section, along with an inch or two of the existing aggregate base material. A portion of this reclaimed (ground and mixed) material would then be spread and compacted on top of the reshaped and compacted existing subgrade and/or aggregate base. Three and one-half inches of bituminous pavement would be installed on top of a minimum of 6 inches of aggregate base composed of existing aggregate base and FDR reclaim material. This pavement section would meet the City of Ramsey's standard pavement design. Though the design strength of this pavement design is less than a typical industrial park pavement design, it should provide a useful life of at least 30 years based on the life achieved by the existing pavement section. Staff also believes this development will re -develop within the next 10 to 20 years, and that new streets will be required as a result of re -development. This proposed project was brought to the Development Review Committee on May 22, 2018 for Staff comment on design alternatives based on potential future development of the HY-10 Ramsey subdivision. Based on the uncertainty of future development, staff felt it would be most cost effective to bring the bituminous pavement up to usable standards, extend utilities and concrete curb and gutter along 147th Avenue only, and not to connect the streets to adjacent developments at this time. The engineer's opinion of probable costs including streets, drainage, and public water utilities is $ 290,000. Estimated costs include 10-percent contingency costs plus 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. The project is proposed to be funded using a combination of special assessments to benefitting properties, street reconstruction bond proceeds, and stormwater utility funds. Sewer and Water Utility Funds would be used to pay for any public utility improvements. Nine (9) parcels have been identified as receiving special benefit from the improvements. Four of the parcels have permanent structures, and the other five are undeveloped. Several of these parcels are currently listed for sale, including two City -owned parcels. These parcels are identified in the preliminary Assessment Map and Roll which are attached in Appendix C. Assessments were calculated using the area method, which is typically used for commercial applications. Staff recommends ordering a special benefit consultation report for this project to verify the proposed assessment amount will not exceed the benefit to the properties. If the report concludes the benefit to the properties is less than the proposed preliminary assessment rate, Staff will then propose to lower the assessment rate accordingly during the Assessment Hearing, which is proposed for October 8, 2019. If the report verifies the assessment rate as proposed is justified, Staff will propose to adopt the final assessment roll using the rate as preliminarily proposed. This project would best be constructed as a stand-alone project and is necessary, feasible, and cost-effective from an engineering standpoint, and can be constructed as proposed herein. Feasibility Report HY-10 Ramsey Street Reconstructions City of Ramsey Project No. 18-02 Page 4