Agenda - Council - 02/11/2020 - Laserfiche WebLink

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Timeframe: Staff estimates 20 minutes will be required to present this case and respond to questions. Observations/Alternatives: Observations: No ground penetrating radar or pavement coring data existed for these streets and Staff had intended to complete field reviews and to research as -built plans and other documentation to determine if any of the street segments had degraded to the point that mill and overlay improvements were no longer feasible, meaning the street required reconstruction instead. While reviewing as -built plans it was determined that the existing pavement sections were generally constructed with less than 3'/2 inches of pavement, which makes it difficult to complete mill and overlay improvements. Staff therefore contacted WSB and Associates to order pavement corings along each street segment to verify pavement section thicknesses. The corings revealed that the bituminous pavement sections generally varied between 2 and 3 inches. This would make it difficult to complete a standard mill and overlay project. In addition, the corings revealed significant degradation of the pavement in most areas meaning the pavement structure was inadequate to support an overlay in most areas. Staff met with Mr. Thomas Wood from WSB on January 16th to discuss the pavement coring results and options for moving this project forward. Three options were generally identified as being feasible. The first option would be to repair damaged curb and gutter and complete a variable -depth mill and paving project in 2020 by milling all existing pavements to full depth, then leveling, shaping and compacting the underlying aggregate base, then paving all streets with about 2'/2 -inches of new bituminous pavement. The cost for this option would be significantly more than a standard 2-inch mill and overlay, and the resulting anticipated pavement life would be roughly 25 years. The second option would be to repair damaged curb and gutter and reconstruct the streets using a full -depth reclamation process in 2020. Though the cost for this option would be significantly more than the first option, the resulting anticipated pavement life would be 60 years. The third option would be to wait to reconstruct the streets until the end of the useful life of the pavement, which is estimated to be 5 to 10 years out. (This paragraph was modified January 17th) Staff recommends the third option as noted in the draft Feasibility Report. If the Feasibility Report is accepted as is, the City Council will be approving Staff's recommendations to not mill and overlay the streets identified within the 2020 - 2029 CIP, but instead review the current CIP to identify other streets that are the best candidates for 2020 mill and overlay improvements based on available funding sources, and authorize Staff to prepare a new Feasibility Report for proposed 2020 mill and overlay improvements under City Improvement Project No. 20-02. This winter and spring, Staff intends to review our current pavement rating system and processes for adding pavement management projects to the Capital Improvement Plan (CIP) to ensure that projects included in the CIP moving forward are identified accurately and can be constructed as proposed. Before the pavement coring results were received and Staff was able to discuss the findings with Mr. Wood from WSB, notices were mailed to property owners having direct access to streets proposed to receive mill and overlay improvements inviting them to a public engagement workshop on Wednesday, January 22nd. The purpose of the workshop was to explain the need for and scope of the proposed improvements, anticipated construction impacts, estimated costs, proposed funding program, and preliminary project schedule. Based on the findings of the pavement corings and Staff's discussions with Mr. Wood from WSB, a second letter was mailed to the same property owners on January 17th canceling the workshop for January 22nd. Alternatives: Alternative # 1 — Motion to recommend City Council acceptance of the Feasibility Report for the 2020 Pavement