Minutes - Public Works Committee - 08/21/2018

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th However, during the Highway 10/Armstrong Interchange project, the west end of 146 Avenue was reconstructed, and a temporary cul-de-sac was constructed. City Engineer Westby stated that the storm sewer system consists of openings in the bituminous th curb at the north end of the Ferret Street cul-de-sac and the east end of the 146 Avenue cul-de- sac. Utility easements exist north of Ferret Street and along the northern boundary of the eastern Ferret Street cul-de-sac which has shallow ditches leading towards Armstrong Boulevard. Storm th runoff from 147 Avenue is collected in catch basins placed as part of the 2012 Sunwood Drive re-alignment project and is carried under Armstrong Boulevard to existing regional ponds. The existing bituminous pavement section ranges from 1.6 o 6.1 inches thick, with an average thickness of 2.9 inches, and the aggregate base ranges from 4.3 to 15.5 inches thick, with an average thickness of 9.7 inches. This was determined from Ground Penetrating Radar (GPR) analysis performed by Braun Intertec in 2017, as well as from field observations and record plan documents. The pavement section was built on sandy subgrade material generally considered suitable for pavement support. City Engineer Westby stated that 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 the above referenced street segments were rated with a PASER rating of 2 which indicates these streets require complete reconstruction. City staff patch the streets at least once per year, particularly before winter so the street can be plowed without further damaging the pavement in the process. Pictures of the street are located in the Draft Feasibility Report. On July 11, 2017, the City Council adopted Resolution #17-07-170 authorizing the preparation of a Feasibility Report for the reconstruction of HY- overlay improvements. However, the overlay work was delayed when construction of the Highway 10 & Armstrong Boulevard Interchange was funded. Then following completion of the Interchange, the pavement was re-evaluated, and staff determined it would be best to reconstruct these streets in the future. This project is now listed in the current 10-year CIP as a total reconstruction. City Engineer Westby stated that staff has not yet discussed the proposed improvements with local property owners. However, staff is proposing to schedule a public information meeting on September 13, 2018 for the purpose of explaining the proposed improvements and assessments in more detail, and to gather public input on the project, including any information which should be explored in more detail during development of plans and specifications. Staff will present the public input to Council during the public hearing. City Engineer Westby stated that proposed improvements include reconstructing the existing bituminous pavement section using the Full Depth Reclamation (FDR) process. This process generally involves reclaiming the entire existing bituminous pavement section, along with an inch or two of the existing aggregate base material. A portion of this reclaimed (ground and mixed) material would then be spread and compacted on top of the reshaped and compacted existing subgrade and/or aggregate base. Three and one-half inches of bituminous pavement would be installed on top of a minimum of 6 inches of aggregate base composed of existing aggregate base and FDR reclaim material. This pavement section would meet the City of Public Works Committee / August 21, 2018 Page 4 of 11