CC PACKET 01121988 - Laserfiche WebLink

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DESIGN The proposed design for the project will include aft roadway from face-to-face of curb to meet MSA standards. No parking will be allowed for the minimum State Aid street width. Design speed for the roadway will be 30 miles per hour. The grade of the roadway will remain basically the same as it is due to the need to provide drainage from adjacent properties, match existing driveways, and sidewalks. The design of the pavement structure is as shown on the drawing on the following page depicting the typical section. A 5" bituminous base and surfacing section overlays a 12" gravel base and 14" sub-base to complete the 9 ton pavement structure. A separation between the bottom of the sub-base and clay subgrade is provided through the use geotextile material to inhibit penetration of the sub-base material into the relatively soft clay materials that underlie. the roadway. Contractors may have to provide some streatment of the clay subgrade to allow heavy construction equipment to operate without major disturbance of the subgrade. We understand the current right-of-way on the golf course side of the project is 2" behind the back face of the existing curb. The original right-of-way for St. Anthony Blvd. in this area is 100 ft; however, .subsequent negotiations with the Park Board/golf course apparently have limited the right-of-way to 2" behind the curb. To allow construction of the project a minimum of 5 ft of permanent easement should be obtained and a construction easement to allow workers access during the project of 10 ft in addition to the permanent easement, would be desirable. There are some elm trees between the curb and sidewalk (on the golf course side of the project) that are relatively close to the construction limits of the project. i.e. roots of the trees would be cut at approximately one foot from the face of the tree trunk. This • -4-