Agenda - Council - 10/09/2018 - Laserfiche WebLink

Home

1. EXECUTIVE SUMMARY City Improvement Project No. 18-00 proposes to reconstruct streets within the Stanhope Terrace neighborhood including Ute Street, 154th Avenue, and 153rd Court. The streets total approximately 2,800 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 streets were constructed in 1991. Based on results from the geotechnical report and ground penetrating radar (GPR) analysis performed by Braun Intertec, field observation and record plan documents, the bituminous pavement section ranges from 1.6 to 6.1 inches thick with an average of 2.9 inches. The aggregate base ranges from 2.1 to 10.6 inches thick with an average of 4.9 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 29 feet from face -of -curb to face -of -curb. The streets are generally centered within a 66 foot wide right-of- way. The storm sewer system consists of catch basins along 154th Lane which drain runoff from the street to a low-lying area with storm sewer and utility easements located on the northern 75 feet of 4851 154th Lane. Storm runoff not collected by the catch basins is carried to Roanoke Street and collected within its storm sewer system. 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 3 which indicates these streets require complete reconstruction, and for City staff to 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 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. This process involves reclaiming the entire existing bituminous pavement section, along with 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 is in good condition and generally meets City design standards and therefore requires only minimal improvements, including resetting the castings after concrete curb and gutter placement, which will include replacing adjustment rings and re -grouting the inside of the catch basins to a smooth finish. The engineer's opinion of probable costs for completing the proposed improvements outlined in this report is $430,934.81. 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 16 assessable parcels have been identified. Staff recommends applying 25-percent of the eligible project costs equally across the 16 assessable properties using the "per lot" assessment method. This results in a proposed preliminary assessment rate of $6,733.36 per assessable parcel. Feasibility Report Stanhope Terrace Reconstructions City of Ramsey Project No. 18-00 Page 3