Agenda - Council - 10/24/2017 - Laserfiche WebLink

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1. EXECUTIVE SUMMARY City Improvement Project No. 18-01 proposes to reconstruct streets within The North Forty neighborhood which includes 163rd Lane, Alpaca Street, Chameleon Street, and 164th Lane. The streets total approximately 2,750 linear feet (0.52 miles) in length. A map showing the location and scope of the proposed improvements is included as Figure 1 in Appendix A. The North Forty neighborhood was constructed in 1989. Based on results from the geotechnical report and ground penetrating radar (GPR) analysis performed by Braun Intertec, field observation and record plan documentation, the bituminous pavement section ranges from 1.3 to 3.7-inches thick with an average of 2.2-inches. The aggregate base ranges from 1.4 to 8.4-inches thick with an average of 4.4-inches. The road section was built on sandy subgrade material generally considered suitable for pavement support. The streets were constructed with bituminous curb to a width of 30-feet from face -of -curb to face -of -curb, and are generally centered within a 66-foot right-of-way. The storm sewer system consists of a catch basin at the intersection of 163rd Street and Alpaca, a bituminous flume between 16420 and 16450 Alpaca Street, a bituminous flume at 16427 Chameleon Street, and a bituminous flume on the cul-de-sac on 164th Lane. The storm sewer systems drain to 3 low-lying areas located within drainage and utility easements. City staff evaluates and rates the condition of pavement sections on all City streets on an annual basis using the Pavement Surface Evaluation and Rating (PASER) system. In the summer of 2017, the pavement section of the above -referenced street segments were rated with a PASER rating of 4 which indicates these streets require complete reconstruction. City staff patch the streets at least once per year, particularly before winter so the street can be plowed without damaging the pavement in the process. Pictures of the street are located in Appendix A. Proposed improvements include replacing existing bituminous curb with B618 concrete curb and gutter and reconstructing the existing bituminous pavement section using the full -depth reclamation (FDR) process. This process involves reclaiming the entire existing bituminous pavement section along with a portion 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 subgrade. Then 3.5 inches of bituminous pavement would be placed, generally meeting the City of Ramsey's standard pavement design. The existing storm sewer system will be updated to meet City design standards. This will include additional catch basins placed along the roadway, and replacing the 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-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. A total of 15 assessable parcels have been identified. Staff recommends applying 25-percent of the eligible improvement costs equally across the 15 assessable properties using the "per lot" Feasibility Report The North Forty Reconstructions City of Ramsey Project No. 18-01 Page 3