6.2. SR 03-06-2006 - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I I I I I I I I I I The inclusion of sidewalks in the project is in accordance with City Council direction to construct pedestrian trails with new roadway projects, public comment and the proximity of the Middle School with the resulting pedestrian traffic it generates. An integral part of the street design is the concrete curb and gutter, which collects runoff and directs it into the storm sewer inlets. Concrete curb protects the edge ofthe road and adjacent boulevard area from erosion. The proposed concrete curb and gutter will be a barrier type curb; similar to curb constructed on previous projects throughout the city. Driveway aprons will accomplish a transition from the street to the driveways. Each driveway will be reviewed during preparation of plans and specifications to determine the transition required. All driveways will receive a 4-foot wide concrete driveway apron where the existing driveway approach meets the new concrete curb section. The driveway aprons taper the gutterline grade to the top of curb grade. Minor changes in grade or elevations may be necessary on some areas to improve storm drainage or sight distances. The horizontal curve east of 192nd Avenue is constructed to a 25 mph design speed. This is less than the State Aid minimum required design speed of 30 mph. A variance to the design standard will need to be requested from MnDDT. The estimated costs for the proposed street improvements are included in the Project Cost section of this report. Storm Drainage With the proposed reconstruction of the roadway to an urban section a storm sewer collection and conveyance system would also be constructed. This would consist of a series of small diameter pipes and catch basins to collect storm water runoff and convey it. Generally, runoffwill be conveyed to the same locations where it currently flows. The estimated costs for the proposed storm drainage improvements are included in the Project Cost section of this report. Sanitary Sewer Although City sanitary sewer is not part of the proposed project the reconstruction ofthe roadway lends itself to completing all underground utilities. Therefore, it is proposed to install sanitary sewer under Highland Road in anticipation that it may be needed during the life of the roadway. The majority of the proposed project area is able to drain by gravity to an existing sanitary sewer manhole located between 192nd Avenue and Jackson Street. This includes 17 houses directly 4