Agenda - Council - 11/14/2017 - Laserfiche WebLink

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Proposed improvements include removing existing bituminous curb and replacing with B618 concrete curb and gutter, and reconstructing the existing bituminous pavement section using the Full Depth Reclamation (FDR) process. The FDR process involves milling the entire existing bituminous pavement section, along with an inch or more of existing underlying aggregate base. This reclaim material would then be spread over the reshaped and compacted subgrade between the concrete curb and gutter, and then the top 3'/2 inches of reclaim material would be removed and hauled off site. Then 3'/2 inches of new bituminous pavement would be installed over the remaining compacted reclaim material, resulting in a 7-ton pavement design, which is standard for residential streets. The existing storm sewer system is proposed to be improved to meet City design standards. This will include additional catch basins placed along the roadway, and replacing existing bituminous flumes, where possible. The engineer's opinion of probable costs for completing the proposed improvements on the North Forty as outlined in this report is $518,685.13. Estimated costs include 5% contingency costs plus 23% indirect costs for administrative, engineering, finance and legal costs. A summary of the engineer's opinion of probable costs is included inAppendix B of the Feasibility Report. Fifteen (15) parcels have been identified as receiving special benefit from the improvements. These parcels are identified in the preliminary Assessment Map and Roll, which are included in Appendix C of the Feasibility Report. Staff recommends assessing 25-percent of eligible improvement costs equally across these 15 parcels using the "per lot" assessment method. This results in a proposed preliminary assessment rate of $8,644.75 per assessable parcel. 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 scheduled for October 9, 2018. 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. Five soil borings were completed by Braun Intertec to assist with the preparation of this report. Pavement design recommendations were offered by Braun Intertec, and Staff considered and incorporated to varying degrees while preparing the report. Ground Penetrating Radar (GPR) was conducted on all street segments within the project. The GPR identifies existing bituminous pavement and aggregate base thicknesses, and is used to help staff determine the appropriate treatment. Copies of Braun Intertec's GPR results and Geotechnical Exploration report are included inAppendix C of the Feasibility Report. This improvement project, which is listed in the City's current 10-year Capital Improvement Plan, is proposed to be funded using a combination of special assessments to benefiting properties, street reconstruction bond proceeds, and storm sewer funds. This project would best be constructed in conjunction with the River's Bend Street Reconstructions and the Stanhope Terrace Street Reconstructions projects, is necessary, feasible, and cost-effective from an engineering standpoint, and can be constructed as proposed herein. Notification: In accordance with State Statutes, the attached Notice of Public Hearing was published in the Anoka Union Herald on October 27 and November 3, 2017, and Public Hearing Notices were mailed to all benefiting property owners identified in the preliminary assessment roll. Observations/Alternatives: