CCP 11-29-1999 - Laserfiche WebLink

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I I. I I I I I I I .. I I I I I I I. I I PROPOSED IMPROVEMENTS Proposed Roadwav Improvements The streets identified in the Ingerson Road neighborhood for this project are all proposed to be fully reconstructed with bituminous surfacing, concrete curb and gutter, storm sewer and pavement subdrainage systems in accordance with current flexible pavement design methodology. Ingerson Road and Hamline A venue (south of Ingerson Road) are MnDOT State Aid designated routes and will be designed to meet or exceed State Aid standards. The proposed pavement sections will be designed in accordance with MnDOT guidelines for flexible pavement design. The typical pavement cross section will include 4 inches of bituminous surfacing, 8-12 inches of aggregate base and 12 inches of sand subbase. The sand subbase will be drained with 4 inch PVC subdrainage pipes connected to storm sewer catch basins. The sand subbase will provide enhanced pavement support, pavement subdrainage and frost protection. Final pavement sections will be determined upon the completion of soil borings and consequent analysis of in place soils. It is anticipated that most the soils within the project area will be fairly uniform with one exception. The segment of Hamline A venue between Ingerson Road and Tiller Lane is anticipated to require significantly more soil correction as a result of its proximity to the adjacent wetlands and apparent damage resulting from excessive frost heaving over the years. This segment of street received the lowest PCI rating in the neighborhood. There are no properties directly served by this segment of Hamline A venue and therefor virtually no assessments are available to assist with funding the cost of its reconstruction. For these reasons, this segment of roadway is not included in the recommended project scope however the estimated cost of reconstruction is itemized in the report for consideration as an alternative. The street reconstruction will include construction of concrete driveway aprons and patching of existing driveways as necessary to meet the new roadway grades. Restoration will include sodding in residential areas and seeding in open space areas or along wetland slope areas. A number of alternatives to be considered for the project are also evaluated in this report. The alternatives include the following: A. Hamline Avenue Vacation This alternative would eliminate the current roadway between Ingerson Road and Tiller Lane adjacent to the wetlands, MnDOT ditches and Highway 51. This segment of roadway would be relatively expensive to construct due to poor existing subgrade soils. Traffic that utilizes this roadway today would likely utilize Dunlap Street as an alternate however the neighborhood area served by this street consists of a portion of Tiller Lane, Dunlap Street, Cannon Street and Dellwood Avenue totaling approximately 30 homes. Therefor the resulting traffic volume increase on Dunlap Street is not expected to be significant. Approximately 50 feet of this roadway segment is assessable therefor the City would bear nearly the entire cost of reconstruction. If the roadway is vacated, the resulting open space could be utilized for storm water ponding purposes which are addressed later in the report. 2