Agenda - Public Works Committee - 04/18/2023

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Public Works Committee 5. 5. Meeting Date: 04/18/2023 Submitted For: Joe Feriancek, Engineering/Public Works By: Joe Feriancek, Engineering/Public Works Title: Consider Recommending City Council Approving Plans and Specifications and Authorizing Advertisement for Bids for Barthel's Rum River Acres 2nd Street Reconstructions, Improvement Project #23-05 Purpose/Background: Purpose: The purpose of this case is to consider recommending City Council approving plans and specifications and authorizing advertisement for bids for Barthel's Rum River Acres 2nd Street Reconstructions, Improvement Project #23 -05 . Background: City Improvement Project #23-05 proposes to reconstruct the streets within the Barthel's Rum River Acres 2nd subdivision, generally located between 161st Avenue and 164th Avenue, adjacent to the Rum River. The streets are 24 feet wide rural section with drainage swales along both sides of the streets, totaling 1.64 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 • August 23, 2022 City Council accepted proposals for geotechnical report and topographic survey • November 15, 2022 Public Works Committee recommended City Council order plans and specifications • December 13, 2022 City Council ordered plans and specifications • February 28, 2023 City Council accepted a proposal for an addendum to the geotechnical report Pavement History The streets within the subdivision were built in 1988. Pavement maintenance has included an initial round of crack seal / seal coat improvements in 1994. In 1997 161 st Lane and Dysprosium Street received overlay improvements. All street segments received 2 more rounds of crack seal / seal coat improvements in 2001 and 2009. Maintenance crews have performed patching over the last several years, including patching some areas of the road with clay subgrade coming to the surface. 2021 PASER values we 2 for all street segments. PASER values of 2 are as low as any street segments within the City. Ground Penetrating Radar (GPR) was performed on the street segments. Bituminous pavement thickness averages were between 3.0 and 3.7 inches thick on the various street segment. Aggregate base thickness was found to vary between 4.0 and 4.6 inches thick. GPR data was not available for some street segments. The GPR summary is included in the attached street segment summary. Proposed Improvements Staff review of the geotechnical report found a mix of native sandy and clayey alluvial soils made up the sub -base material. The sandy materials are well suited for pavement support and are considered non -frost susceptible and are also free draining materials. The clayey soils are considered undesirable materials, and are proposed to be replaced with 2 feet of select granular material on top of geotechnical fabric. Generally, these subsoil corrections are proposed along 164th Avenue, the northern portion of Germanium Street, and 161st Avenue connecting into the Estates of Silver Oaks subdivision. Additionally, the southern portion of Germanium Street and adjacent 161st Lane was found to have a high-water table, which seasonally impacts the strength of the pavement section. The project proposes to raise the elevation of the pavement approximately 1-foot to allow the pavement section to be