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5. Minimum street grade shall be 0.75%. The design maximum shall not exceed 5.0% for arterials and 7.0% for others. Special situations such as saving environmental features may allow limited areas of 10.00% with City approval. 6. Streets shall be designed to intersect at right angles whenever possible. In no case shall the angle of intersection between two streets be less than sixty (60°) degrees. Unless approved by the City street intersections and commercial driveway intersections shall match at the centerlines. If the streets or driveways cannot be aligned to match, the intersections shall be offset a minimum of 300 feet or as approved by the City Engineer. 8. Barricades in accordance with the Minnesota Manual on Uniform Traffic Control Devices shall be placed at all dead end streets. 9. At intersections, the street grade shall no exceed 3.00% for the first 30 feet approaching said intersection. The 30 feet is measured from the curb line of the intersected street. In cul-de-sacs, the gutter grade shall not be less than 0.80%. A minimum 0.5 foot crown or minimum 3.00% cross slope grade, whichever is greater, is required of all street cross-sections. The minimum curb return radius shall be 20 feet. The minimum grade around curb returns shall be 0.50%. 10. Private streets and or common driveways shall be a minimum of 20' wide and built to a 7 -ton design. 11. The City requires concrete valley gutters across street and driveway intersections with overland cross drainage having a grade less than 1%. 12. The design of streets shall accommodate a minimum of a 5 -foot clear zone behind the curb where trailways or sidewalks are proposed and a minimum of 12 feet in areas without trailway or sidewalk to provide for adequate sight distances and snow storage. The clear zone area will be the boulevard behind the curb. This area shall not contain any landscaping other than a ground cover and the area shall have a maximum 2% slope unless approved by the City. At intersections, the clear zone is a triangle measured back 60 feet on each side from the curb line of the intersected street. 13. Retaining walls over 4 feet in height must be designed by a Minnesota Registered Professional Structural Engineer. The retaining wall is to be located on private property. The construction of any retaining walls within the public right-of-way will need prior approval of the City Engineer. All walls over 4 feet in height will require an approved fence at the top of the wall. The retaining wall construction will require the submittal of detailed plans and specifications for review by City staff and a permit through the Building Department. 14. The design and construction of sidewalks and trailways shall be in accordance with the City's Standard Plates and City ordinances. Residential sidewalks shall be 5 -foot wide concrete and trailways shall be a minimum of 8 -foot wide bituminous. In commercial/industrial/retail areas, the sidewalk shall be 6' wide.