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

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lour 1111.1siion: To work together to reiposihty grow our community, and to provide quality, coat -effective, and efficient government ierrlcas. CC Regular Session Meeting Date: 10/24/2017 By: Bruce Westby, Engineering/Public Works 7. 5. Information Title: Adopt Resolution #17-10-272 Accepting Feasibility Report and Ordering Public Hearing for Improvement Project #18-01, North Forty Street Reconstructions Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #17-10-272 accepting the Feasibility Report and ordering a Public Hearing on November 14, 2017, for Improvement Project #18-01, North Forty Street Reconstructions. Background: City Improvement Project # 18-01 proposes to reconstruct streets within the North Forty neighborhood including 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 in the attached Feasibility Report 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 163d 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, 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 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