Agenda - Council - 11/13/2018 - 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: 11/13/2018 By: Bruce Westby, Engineering/Public Works Information Title: PUBLIC HEARING: Adopt Resolution # 18-231 Approving Feasibility Report and Ordering Plans and Specifications for Improvement Project #19-03, Wood Pond Hills & Chestnut Ridge Street Reconstructions Purpose/Background: Purpose: The purpose of this case is to conduct a Public Hearing then consider adopting Resolution #18-231 approving the Feasibility Report and ordering plans and specifications for City Improvement Project #19-03, Wood Pond Hills and Chestnut Ridge Street Reconstructions. Background: City Improvement Project No. 19-03 proposes to reconstruct streets within the Wood Pond Hills and Chestnut Ridge neighborhoods including 146th Avenue, Helium Street, and Krypton Street. The streets total approximately 3,310 linear feet (0.63 miles) in length. Figure 1 in Appendix A in the attached Feasibility Report shows the scope of the proposed improvements. Existing Conditions These streets were constructed between 1992 and 1994 as urban sections using bituminous pavement, surmountable concrete curb and gutter, and concrete storm sewer. The streets were constructed to a width of 30-feet from face -of -curb to face -of -curb, and are generally centered within 60-foot wide right-of-ways. Sanitary sewer and watermain infrastructure exist under each of the streets and are generally considered to be in good operating condition. The existing storm sewer system consists of concrete catch basins that collect stormwater runoff from the curb and gutter, and concrete storm sewer pipes that route the runoff to stormwater ponding areas where the runoff is stored and treated. The storm sewer system is also generally considered to be in good condition with only minor maintenance work proposed. The existing bituminous pavement section ranges from 1.6 to 5.0 inches thick, with a median thickness of 2.5-inches, as determined from Ground Penetrating Radar (GPR) analysis performed by Braun Intertec in 2017, as well as from field observations and record plan documents. The existing aggregate base section ranges from 1.3 to 8.4 inches thick, with a median thickness of 4.1-inches. The pavement section was built on generally poorly graded sand with silt subgrade material generally considered suitable for pavement support with proper conditioning. Ten (10) soil borings were completed by Northern Technologies (NTI) to assist Staff with preparing the Feasibility Report. Pavement design recommendations were also offered by NTI, and Staff considered and incorporated NTI's recommendations to varying degrees in preparing the report.