Agenda - Council - 04/27/2021 - Laserfiche WebLink

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The storm sewer televising showed that more than half of the storm sewer was plastic pipe, and that much of the smaller diameter plastic pipe needed to be replaced. In addition, several hundred feet of concrete storm sewer needed to be replaced. This cost was not accounted for in the CIP storm sewer cost estimates, which significantly increased project costs. In 2020, Business Park 95 was included in the Ground Penetrating Radar Pavement Evaluation performed by Braun Intertec. This data provides bituminous and aggregate base thickness information. The Ground Penetrating Radar (GPR) data is included in the street segment summary attached to this case. The Business park 95 subdivision is a commercial subdivision with heavy truck traffic. During the fall of 2020, Staff took traffic counts with annual daily traffic (ADT) volumes of; 846 on Unity Street south of Bunker Lake Boulevard, and 2,245 on McKinley Street east of Sunfish Lake Boulevard. The City does not have a standard commercial pavement section, however, since these roads must be open during all seasons to heavy truck traffic, the streets are proposed to be reconstructed to a 9-ton design using MnDOT's design guidelines. Based upon pavement coring's, the existing pavement section meets a 9-ton design. The existing concrete curb and gutter is generally in good condition. The streets are proposed to be reconstructed using the full -depth reclamation process. This includes reclaiming the existing pavement and aggregate base section, removing the top 4-inches of reclaim, and then compacting the remaining 6-inches of material in place to serve as aggregate base. Then 4-inches of new bituminous pavement is proposed to be placed on top to effectively provide a 10-inch minimum pavement section, meeting a 9-ton design strength. The pavement on the east end of McKinley Street ends approximately 450-feet east of Radium Street, after which it becomes a gravel surface for approximately 75-feet before turning into a private driveway. This leaves no space within public right of way for snow plows or emergency vehicles to turn around. The plans include an alternative bid for extending the pavement on McKinley Street approximately 250-feet east, and constructing a paved cul-de-sac on the east end within existing right-of-way. The cul-de-sac extension is supported by the Public Works Department and Fire Department. This cul-de-sac extension would have the added benefit of providing better access to an existing trunk sanitary sewer line which exists in green space east of McKinley Street. Bidding the cul-de-sac extension as an alternate bid will allow the City Council to know the bid price before deciding whether to construct the cul-de-sac extension. Approximately 450-feet of the west end of McKinley Street is proposed to be left as is as this segment will be reconstructed with the Sunfish Lake Boulevard & BNSF Railway grade separation improvements, part of the Ramsey Gateway Highway 10 Improvements project. The construction limits on the west end of McKinley Street were designed to match the tie down location for the segment of McKinley Street to be reconstructed with the Ramsey Gateway Improvements to avoid throw away costs. The street improvements proposed with this project are identified in the City's current 10-year CIP, and can be funded using a combination of Pavement Management Funds, Stormwater Utility Funds, and previously budgeted funds. The McKinley Street extension is proposed to be funded using a combination of Public Improvement Revolving Funds and Stormwater Utility Funds. 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 herein. The proposed improvements are designated as City Improvement Project #21-03, Business Park 95 Street Reconstructions. Notification: Advertisements were published in the Anoka Union Herald and in Finance & Commerce on March 26 and April 2, 2021. Bids were also advertised on-line on QuestCDN. Observations/Alternatives: