A. All subdivision boundary corners and block corners (including points of curvature) shall be marked with permanent survey monuments. A permanent survey monument shall be a quarter-inch brass plate three inches in diameter, permanently attached to a shaft with a minimum length of two inches and a minimum diameter of one-half inch set flush in a concrete block twelve (12) inches deep into the ground and twelve (12) inches in diameter. The point shall be stamped in the plate with identifying information and the surveyor’s registration number. Except in cases where it is deemed clearly unreasonable or infeasible by the city council, these monuments shall be described in relation to the located section corners of the Coordinate System of the state. All lot corners shall be monumented with iron pins of a minimum of one-half inch in diameter and twenty-four (24) inches in length or with iron pipe of a minimum of three-quarters inch in diameter and twenty-four (24) inches in length.
B. In the event that points fall on solid bed rock, or on concrete or stone roadways, curbs, gutters or walks, a durable metal disk or cap shall be securely anchored in the rock or concrete and stamped with the survey point and the registration number of the land surveyor responsible for the establishment of the monument or marker.
C. In the event that the monuments or markers cannot practically be set because of steep terrain, water, marsh or existing structures, or if they should be lost as a result of proposed street, road or other construction, one or more reference monuments shall be set. Affixed to the monument, in addition to the surveyor’s registration number, shall be the letters “RM” or “WC.” Such reference monuments shall be set as close as practical to the true corner and shall meet the same physical standards that would be required for the true corner were it set. If only one reference monument is used, it must be set on the actual boundary line or a prolongation thereof. Otherwise, at least two reference monuments shall be set.
D. All monuments shall be in place prior to the approval of the final plat. However, to facilitate grading and installation of utilities, the subdivider may, if the city council consents, file a bond with the city, to insure placement of monuments within a period not to exceed six months after approval of the final plat. If the subdivider elects to file a bond for the placement of monuments, sufficient temporary staking shall be done to provide for grading and construction. Should conditions prohibit the placing of monuments on the line, off-set markings will be permitted; provided, however, that exact off-set courses and distances are shown on the subdivision plat. (Ord. 433 (part), 1995)
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)
A. General. Sanitary sewer, storm sewer, water distribution, electrical, gas, telephone and communications, cable and all other utility lines shall be installed in rear lot easements or alleys wherever practical. Where it is impractical to install such utility lines in rear lot easements, they shall be installed within the unpaved portions of the street right-of-way except for sanitary and storm sewer lines which may be installed in the paved portion of the street right-of-way if it is impossible to install them in the unpaved portion. All utility lines will be buried underground according to accepted installation codes.
2. When it is impossible to install sanitary and storm sewer lines in the unpaved portion of the street right-of- way, all such utility lines, including service connections, shall be completely installed and inspected and approved by the planning administrator, following the grading of the street and prior to the application of any pavement base.
3. Where sanitary and storm sewer lines are to be installed in the unpaved portion of the street right-of-way, the installation of service connections may be delayed; provided, that at such time as these service connections are installed, they may be installed without breaking or weakening the existing pavement. Where rock is known to exist beneath the pavement area at such depth as to interfere with the installation of service connections, the complete installation of service connections shall be required prior to the application of any pavement base.
B. Water Supply Improvements. Where the public water supply is reasonably accessible or available to the proposed subdivision, as determined by the city council, a complete water distribution system which shall adequately serve all lots, which shall include appropriately spaced fire hydrants, and which shall be properly connected with the public water supply system, shall be installed. Where a public water supply system is not reasonably accessible to the subdivision, alternate water supply facilities approved by the city council and the South Dakota Board of Water and Natural Resources, SDCL 34-A-2-3 et seq., shall be installed.
C. Sanitary Sewer Improvements. Where the public sanitary sewer system is reasonably accessible or available to the proposed subdivision, as determined by the city council, a complete sanitary sewer system which shall adequately serve all lots and which shall be properly connected to the public sanitary sewer system shall be installed. Where a public sanitary sewer system is not reasonably accessible to the subdivision, alternate community sanitary sewer facilities, which shall be approved by the city council and the South Dakota Board of Water and Natural Resources, SDCL 34-A-2-3 et seq., shall be installed. In the event a community sanitary sewer is determined to be necessary by the city council and the South Dakota Board of Water and Natural Resources, SDCL 34-A-2-3 et seq., the same shall be installed and provision for its continued maintenance shall be established. In any case, sanitary sewer facilities shall be installed as required by standards and specifications as approved by the city council and the South Dakota Board of Water and Natural Resources, SDCL 34-A-2-3 et seq.
D. Storm Drainage. An adequate drainage system, including necessary open ditches, pipes, culverts, intersectional drains, drop inlets and bridges for the proper drainage of all surface winter shall be installed. Cross drains shall be provided to accommodate all natural winter flow and they shall be of sufficient length to permit full width roadways and the required slopes. (Ord. 433 (part), 1995)
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