Agenda - Council - 01/24/2017 - Laserfiche WebLink

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The existing storm sewer system is in good condition and generally meets current State Aid design standards and therefore requires only minimal improvements including three catch basins and about 100 feet of pipe. An off-street bike trail exists along the south side Alpine Drive but is in relatively good condition and is not proposed to be improved as part of this project. The engineer's opinion of probable costs for completing the proposed improvements on Alpine Drive as outlined in this report is $463,000. Estimated costs include 23%indirect costs for administrative, engineering, finance and legal costs. A summary of the engineer's opinion of probable costs is included inAppendix B of the attached Feasibility Report. No parcels have been identified as receiving special benefit from the improvements so the use of special assessments as a funding source for this project is not proposed. A total of four pavement corings were completed by WSB and Associates (WSB)to assist with the preparation of this report. In addition,thirteen soil borings were completed by Northern Technologies, Inc. (NTI). Both firms offered pavement design recommendations which were considered and incorporated to varying degrees while preparing this report. Copies of WSB's and NTI's reports are attached inAppendix C of the attached Feasibility Report. This improvement project,which is listed in the City's current Capital Improvement Program, is proposed to be funded using a combination of street reconstruction bond proceeds and stormwater utility funds. Staff has not yet had an opportunity to discuss the proposed improvements with local property owners. However, upon Council acceptance of this report Staff will immediately contact local property owners for the purpose of explaining the proposed improvements and to request a meeting to discuss the proposed improvements in more detail and to gather their input on the project, including any information that should be explored in more detail during development of plans and specifications. Staff will then present this information to Council at the time plans and specifications are presented to Council for approval. This project would best be constructed as a stand-alone project and is necessary, feasible, and cost-effective from an engineering standpoint, and can be constructed as proposed in the attached Feasibility Report. Notification: No notifications are required for this case. Observations/Alternatives: Observations: The proposed pavement design should result in a minimum pavement life of 30 years, assuming that proactive, regular pavement maintenance treatments are performed during the life of the pavement.While a 60-year design life would typically be targeted for a reconstructed street,this project is not proposing a full reconstruction due to the good condition of the majority of existing 15 year old curb and gutter. Therefore, only the recycled concrete base and bituminous sections are proposed to be reconstructed now as it may make sense to consider replacing the pavement section again at the time the rest of the existing curb and gutter is replaced at the end of its useful life 35 or more years into the future. Developed properties along the project corridor may have private irrigation systems. However, impacts to these systems would only occur if the existing curb and gutter is being removed and replaced. In the past,the City has typically repaired private irrigation systems that are damaged as part of a street reconstruction project. However, staff is requesting Council permission to change this practice on all future projects by instead notifying property owners of pending construction at least 15 business days in advance to allow them time to move their irrigation systems out of harm's way before work begins. Plans and specifications will therefore not be developed with a bid item for repairing private irrigation systems. Alternatives: