Agenda - Public Works Committee - 06/20/2023

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Public Works Committee Meeting Date: 06/20/2023 Submitted For: Joe Feriancek, Engineering/Public Works By: Joe Feriancek, Engineering/Public Works 5.3. Title: Consider Recommending City Council Approving Plans and Specifications and Authorizing Advertisement for Bids for Whispering Pines Estates Plat 3 Street Reconstructions, Improvement Project #23-10 Purpose/Background: Purpose: The purpose of this case is to consider recommending City Council approving plans and specifications and authorizing advertisement for bids for Whispering Pines Estates Plat 3 Street Reconstructions, Improvement Project #23-10. Background: City Improvement Project #23-10 proposes to reconstruct the streets within the Whispering Pines Estates Plat 3 subdivision, generally located west of Armstrong Boulevard between 157th Lane and 158th Lane. The streets are 24 feet wide rural section, totaling 1.72 miles in length. A street segment summary is attached to this case for reference. Project History • 2023 — 2032 Capital Improvement Program — listed as street reconstruction for 2023 • November 7, 2022 City Council accepted proposals for geotechnical report and topographic survey with Resolution #22-251 • November 15, 2022 Public Works Committee recommended City Council order plans and specifications • December 13, 2022 City Council ordered plans and specifications with Resolution #22-289 Pavement History The streets within the subdivision were built in 1979. Pavement maintenance has included an initial round of crack seal / seal coat improvements in 1985. An overlay was performed in 1994, followed by crack seal / seal coat improvements in 2001. Maintenance crews have performed patching over the last several years. The last PASER values taken in 2021 were 2 for most street segments. Ground Penetrating Radar (GPR) was performed on the street segments. Bituminous pavement thickness averages were between 3.4 and 3.7 inches, aggregate base thickness averages varied between 2.6 and 4.8 inches. The GPR summary is included in the attached street segment summary. Proposed Improvements Staff review of the geotechnical report found a mix of poorly graded sand and poorly graded sand with silt. The sandy materials are well suited for pavement support and are considered non -frost susceptible and are also free draining materials. The project proposes to use the reclamation rehabilitation process. This process will include reclamation of the existing street and aggregate base, removal of excess reclaim material, and placement of 2.5 inches of new bituminous pavement, generally back to existing grade. The reclamation rehabilitation process includes matching into the existing grades at the edge of pavement, and avoids driveway replacements, and causes minimal disturbance to the boulevards. Drainage Improvements The project proposes to replace the existing street crossing culverts with new concrete culverts. Generally matching the same grade and locations.