Agenda - Council - 01/08/2019 - Laserfiche WebLink

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1. EXECUTIVE SUMMARY City Improvement Project No. 19-02 proposes to reconstruct streets within the Brookview Estates neighborhood including 173rd Avenue and Germanium Street. The streets total approximately 2,662 linear feet (0.50 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 1979 as rural sections with bituminous pavement to a width of 24 feet, and are generally centered within a 66-foot wide right-of-way. The storm sewer system generally consists of ditches along both sides of the road within the right- of-way and drainage and utility easements. Storm runoff collects in the ditch along Germanium Street and is carried north to the Trott Brook through an outlet pipe located in the north cul-de-sac. Storm runoff collects in the ditch along 173rd Avenue and goes across land into the Rum River to the east. The existing bituminous pavement section ranges from 2.0 to 6.0 inches thick, with a median thickness of 3.6-inches, and the aggregate base ranges from 0.8 to 5.0 inches thick, with a median thickness of 2.7-inches. This was determined from Ground Penetrating Radar (GPR) analysis performed by Braun Intertec in 2017, as well as from field observations and record plan documents. Copies of Braun Intertec's GPR results are attached in Appendix C. The pavement section was built on primarily poorly graded sands with silts subgrade material which is generally considered usable for pavement support with the proper preparation. 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 2018, the pavement section of the above referenced street segments were rated with a PASER rating of 3 which indicates these streets require complete reconstruction. City staff patch the streets at least once per year, particularly before winter so the streets can be plowed without further damaging the pavement in the process. Pictures of the streets are located in Appendix A. Proposed improvement include 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 for residential streets. Existing ditches will likely require re -grading and other drainage construction is likely, however, driveway culverts are generally not anticipated to be affected by this project. Additional storm sewer is anticipated to be added to improve storm runoff water quality prior to flowing into Trott Brook. Drainage easements may be needed in one or more locations. The engineer' s opinion of probable costs for completing the proposed improvements outlined in this report is $502,555.46. Estimated costs include 5-percent contingency costs plus 23-percent Feasibility Report Brookview Estates Street Reconstructions City of Ramsey Project No. 19-02 4