Agenda - Council - 11/14/2017 - 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 6. 3. Meeting Date: 11/14/2017 By: Bruce Westby, Engineering/Public Works Information Title: PUBLIC HEARING: Adopt Resolution #17-11-286 Approving Feasibility Report and Ordering Plans and Specifications for Improvement Project #18-01, The North Forty Street Reconstructions Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #17-11-286 approving Feasibility Report and ordering Plans and Specifications for Improvement Project #18-01, North Forty Street Reconstructions. Background: City Improvement Project # 18-01 proposes to reconstruct four street segments within the North Forty residential neighborhood including; • 163rd Lane between Armstrong Boulevard and Alpaca Street, • Alpaca Street between 163rd Lane and 165th Avenue, • Chameleon Street between 163rd Lane and 164th Lane, and • 164th Lane between Chameleon Street and the termini cul-de-sac. These street segments total approximately 2,750 linear feet in length. A map showing the location and scope of the proposed improvements is included in the Feasibility Report as Figure 1 in Appendix A, which is included as an attachment to this case. These street segments were constructed in 1989. Per field observations, record plan documents, and results from Braun Intertec's geotechnical report and ground penetrating radar (GPR) analysis, 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, and the pavement 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 66-foot right-of-ways. 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 sections of these street segments were rated with a PASER rating of 4, indicating that these streets require complete reconstruction. City staff patch the streets annually, particularly before winter so the streets can be plowed without further damaging pavement in the process. Pictures of the street are included inAppendix A of the Feasibility Report.