Agenda - Council - 10/08/2019 - Laserfiche WebLink

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Our Mistioi}: To work together to reipoiibly grew our comma nityr, and to provide quality, cent-oliBcdwe, and efficient government services. CC Regular Session 6. 2. Meeting Date: 10/08/2019 By: Bruce Westby, Engineering/Public Works Information Title: Adopt Resolution #19-237 Adopting Assessment Roll Certifying Assessments for Improvement Project #19-03, Wood Pond Hills & Chestnut Ridge Street Reconstructions Purpose/Background: Purpose: The purpose of this case is to conduct the required Assessment Hearing and adopt Resolution #19-237 adopting the final assessment roll certifying assessments for Improvement Project #19-03, Wood Pond Hills and Chestnut Ridge Street Reconstructions. Background: City Improvement Project #19-03, Wood Pond Hills and Chestnut Ridge Street Reconstructions, included the reconstruction of streets within the Wood Pond Hills and Chestnut Ridge neighborhoods including 146th Avenue, Helium Street, and Krypton Street. Maps attached to this case show the general location and scope of the proposed improvements. Original Conditions The streets within these developments were constructed between 1992 and 1994 as urban sections using bituminous pavement, surmountable concrete curb and gutter, and concrete storm sewer. These streets were constructed to a width of 30-feet from face -of -curb to face -of -curb, are generally centered within 60-foot wide right-of-ways, and measure approximately 3,310 linear feet (0.63 miles) in length. Attached is a street segments summary depicting the original conditions including PASER ratings, maintenance histories, and pavement section information obtained from ground penetrating radar. The existing bituminous pavement section ranged between 1.6 and 5.0 inches thick, with a median thickness of 2.5 inches. The existing aggregate base section ranged between 1.3 and 8.4 inches thick, with a median thickness of 4.1 inches. Section thicknesses were obtained using Ground Penetrating Radar (GPR) analysis performed by Braun Intertec in 2017. The pavement section was built on generally poorly graded sand with silt subgrade material generally considered suitable for pavement support with proper conditioning. The City annually evaluates and rates the condition of pavement on all City streets using the Pavement Surface Evaluation and Rating (PASER) system. In the summer of 2018, the pavement sections of the above referenced street segments had a PASER rating of 2, except the south half of Krypton Street, which was rated at 4. PASER ratings of 3 or less indicate the street requires reconstruction. Staff recommends reconstructing all streets, including the south half of Krypton Street. This will keep all pavement sections on the same maintenance schedule moving forward, and it would likely cost more to overlay the south half of Krypton Street due to additional contractors and mobilizations.