Agenda - Council - 11/13/2018 - Laserfiche WebLink

Home

1. EXECUTIVE SUMMARY City Improvement Project No. 19-01 proposes to reconstruct streets within the Ford Brook Estates neighborhood including 180th Lane and Krypton Street. The streets total approximately 860 linear feet (0.16 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 1981 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 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 TH 47 and is carried north to Ford Brook. The existing bituminous pavement section ranges from 1.2 to 6.4 inches thick, with a median thickness of 4.3 inches, and the aggregate base ranges from 2.4 to 6.8 inches thick, with a median thickness of 4.1 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 silty sand and lean clay subgrade materials generally not considered ideal for pavement support. 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 2 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 improvements include removing the existing bituminous pavement and aggregate base along with 2 feet of the unsuitable subgrade material. Two (2) feet of select granular sand will then be placed over geotextile fabric, with drain tile added at the low points, followed by 4 inches of aggregate base, and 3.5 inches of bituminous pavement, generally meeting the City of Ramsey's standard pavement design. Existing ditches will require re -grading due to the soil corrections for residential streets, however, driveway culverts are not anticipated to be affected by this project. Drain tile will be added to properly drain the soil corrections. No other storm sewer improvements are proposed with this proj ect. The engineer's opinion of probable costs for completing the proposed improvements outlined in this report is $239,464.57. 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 probably costs is included in Appendix B. Feasibility Report Ford Brook Estates Street Reconstructions City of Ramsey Project No. 19-01 4