All plans and specifications for street grading and surfacing, including curb and gutter and sidewalk, shall be presented to the city planning commission for approval.
A. Grading Specifications. All streets, roads and alleys shall be graded to their full widths by the subdivider so that street pavements and sidewalks can be constructed on the same level plane. Deviation from this standard due to special topographical conditions will be allowed only with the approval of the city council. Before grading is started, the entire right-of-way area shall be first cleared of all tree stumps, roots, brush and other objectionable materials and of all trees not intended for preservation. The subgrade shall be properly shaped, rolled and uniformly compacted to conform with the accepted cross-section and grades. In cuts, all tree stumps, boulders, organic material, soft clay, spongy material and other objectionable materials shall be removed to a depth of at least two feet below the graded surface. Rock, when encountered, shall be removed to the grade line. Junctions of cuts and fills will be undercut to a depth of one foot. In fills, all tree stumps, boulders, organic material, soft clay, spongy material and other objectionable material shall be removed to a depth of at least two feet below the natural ground surface. This objectionable matter, as well as similar matter from cuts, shall be removed from the right-of-way area and disposed of in such a manner that it will not become incorporated in fills or hinder proper operation of the drainage system.
B. Minimum Pavement Widths. Pavement widths shall be measured back of curb to back of curb. Minimum pavement widths to be provided are:
Street Type | Back of Curb to Back of Curb Widths |
Parkways | 12 feet for each lane (traffic or parking) |
Arterials | 38 feet back to back |
Collector | 38 feet back to back |
Minor | 32 feet back to back |
Marginal Access | 32 feet back to back |
Industrial and commercial | 30 feet back to back |
C. Street Pavement. Street pavement shall be provided for all streets and, according to current South Dakota State Department of Highways, standard specifications for either portland cement concrete pavement or bituminous concrete pavement. Such pavement shall be designed to be appropriate for the location of the street and for the type of development and use contemplated. The minimum requirements for surfacing of streets shall be four inches of aggregate base and two inches of bituminous concrete pavement. If full depth bituminous concrete paving is desired by the subdivider, each additional one inch of bituminous concrete pavement may replace two inches of aggregate base.
D. Curb and Gutter. Curb and gutter shall be provided in all subdivisions. Curbs shall not be less than six inches in height and shall be constructed of portland cement concrete. Backfill shall be higher than the curb and shall slope toward the curb in order to insure that surface water drains into the storm drainage system.
E. Sidewalks. For the safety of pedestrians in residential and commercial subdivisions, sidewalks constructed of portland cement concrete shall be constructed on each lot on both sides of the street to meet the following specifications:
1. Commercial developments: twelve (12) feet wide and four inches thick.
2. Multifamily or group housing developments: five feet wide and four inches thick.
3. Single-family or duplex housing developments: four feet wide and four inches thick. (Ord. 433 (part), 1995)