(A) Minimum pavement widths.
Pavement widths shall be measured between curbs. Minimum pavement widths to be provided are as follows:
Minimum Pavement Widths (Feet) | ||||
Land Type | ||||
Street Type | I | II | III | IV |
Minimum Pavement Widths (Feet) | ||||
Land Type | ||||
Street Type | I | II | III | IV |
Single roadways | ||||
Arterial streets | 48 | 48 | NP | NP |
Collector streets | ||||
Standard | 40 | 36 | 36 | NP |
Dead-end | 36 | 36 | 24 | NP |
Minor streets | ||||
Through streets | 30 | 24 | 24 | 24** |
Local streets | 24 | 24 | 24 | 24** |
Marginal access roads | 24 | 24 | 24 | 24* |
Alleys | 18 | 16 | 16 | 16* |
Split roadways (each roadway) | ||||
Arterial streets | 24 | 24 | NP | NP |
Collector streets | ||||
Standard | 20 | 18 | 18 | NP |
Dead-end | 20 | 18 | 18 | NP |
Minor streets | ||||
Through streets | 18 | 12 | 12 | 12* |
Local streets | 20 | 12 | 12 | 12* |
Marginal access roads | 18 | 12 | 12 | 12* |
Alleys (cannot be split) | ||||
(1) NP shall mean not permitted.
(2) * shall mean permitted only with approval of the Planning Commission.
(3) ** shall mean permitted only with approval of Planning Commission. Pavement widths may be lowered where five or fewer single- family dwellings are served. However, the pavement must be at least ten feet wide. This does not apply to split roadways.
(B) Cul-de-sac pavement.
(1) Type I land. The pavement of the turnaround of a cul-de- sac shall have a radius of 40 feet.
(2) Type II and III land. Where a circular turnaround cannot be constructed due to topographical conditions, a “T” turnaround shall be permitted. The pavement of the “T” shall extend 40 feet from the centerline of the street. The pavement of the “T” shall be at least ten feet wide.
(3) Type IV land. The standards for Type II and III land in division (2) above shall apply to Type IV land. However, where five or fewer dwelling units are served, the standard may be lowered.
(C) Grading specifications. All streets, roads, and alleys shall be graded to their full widths by the subdivider so that pave-ments and sidewalks can be constructed on the same level plane.
(1) Cuts and fills.
(a) Major cuts, excavation, grading and filling where the same materially changes the site and its relationship with surrounding areas or materially affects these areas, shall not be permitted if the excavation, grading, and filling will result in a slope exceeding a vertical rise of one foot for each two feet of horizontal distance between abutting lots or between adjoining tracts of land, except where adequate provision is made to prevent slides and erosion by cribbing and retaining walls.
(b) In cuts, all tree stumps, boulders, organic material, soft clay, and spongy material, and 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. The fill material shall be free from trash and other foreign objects.
(c) Fills shall be free of all debris and foreign matter and compacted to a density of no less than 90% of maximum density at its optimum moisture content.
(d) Travel surfaces and at least three feet of shoulder constructed on Type III and IV land shall be placed on a bench, natural or man-made, on the hillside and no portion shall be constructed on fill adjacent to or below the bench.
(2) Preparation of the subgrade. 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 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 conformance with the State Department of Highway's current specifications for preparation of the subgrade.
(D) Pavement specifications for streets. The subdivider shall provide street pavements which shall be designed to carry the expected traffic loads and which shall conform with the State Department of Highway's current standard specifications for portland cement concrete pavement or bituminous concrete pavement. All street pavements shall be of a dust-free type. Loose aggregate will not be considered a complete pavement.
(E) Curbs and gutters.
(1) Curbs shall not be less than six inches in height and shall be constructed of portland cement concrete. Back fill shall be higher than the curb and shall slope toward the curb in order to ensure that surface water drains into the storm drainage system. The curb and gutter shall empty into an underground storm sewer system, or with the approval of the City Engineer and Planning Commission, into a stream or other natural watercourse.
(2) The Planning Commission may waive the requirement for curb and gutter in single-family residential developments if they are not deemed necessary for proper drainage and where all lots are greater than 100 feet in width at the building line.
(a) Where curbs and gutters are waived, an additional five feet of right-of-way on each side of the proposed street shall be dedicated. Additional right-of-way to facilitate drainage shall be dedicated, if necessary.
(b) Drainage ditches shall be constructed within the street right-of-way. The ditches shall be of adequate size to carry the runoff water and to prevent flooding. The Planning Commission may require concrete-lined ditches or any other improvements needed to prevent flooding and erosion. The ditch line shall be a distance of ten feet or more from the edge-of-metal on an arterial street. On other streets, the drainage ditch line shall be five feet from the edge-of-metal. The shoulder, ditch, and remaining right-of-way shall be sodded or otherwise stabilized from the edge-of-metal to the right- of-way line.
(c) Access to lots along streets where drainage ditches are used shall be either by a spill or over a culvert.
1. Where a spill is used, it shall be so designed as to prevent water from crossing the ditch. At the ditch line, the spill shall be at least six inches below the street pavement and right- of-way line and constructed to allow the free flow of water through the ditch. The spill shall be constructed of portland cement at least six inches thick and it shall start at the edge-of-metal and may stop at the right-of-way line.
2. Where a culvert-type access is used, an opening of at least 15 inches shall be made under the access at the ditch line. The City Engineer or Planning Commission may require a greater opening when necessary. Bulkheads shall be constructed on each side of the opening to prevent erosion. The opening shall be constructed so as to maintain the flow of water in the ditch. Steps shall also be taken to prevent the flow of water over the access, either from the lot to the street or from the street to the lot.
(F) Street name signs. The Planning Commission shall require the installation of durable street name signs at all intersections.
(Ord. 930.1, passed 3-15-71) Penalty, see § 155.99