1. When improvements are to be installed, construction plans shall be prepared by a registered Iowa Professional Engineer, whose seal shall appear thereon, and a reproducible copy on film or other permanent material, plus two prints furnished, in accordance with specifications approved by the City Engineer, and shall be revised as may be necessary and receive approval of the City Engineer and other agencies having jurisdiction before improvements are installed. Construction plans shall be provided, as follows, at a minimum:
A. Plan and profile of each street with grades indicated and horizontal and vertical curve data provided;
B. Typical cross-section of each proposed street, at a horizontal and vertical scale of 5 feet or less to the inch, showing the width of pavement, the location and width of any sidewalks, and the location of utility mains. Cross-sections for each street shall be furnished at hundred-foot intervals or less. These sections shall be at a horizontal scale of 10 feet or less per inch and a vertical scale of 5 feet or less per inch.
2. Streets shall be graded to full right-of-way width. The surfacing in residential areas of collector, minor, or local streets shall be 7 inches of Portland cement concrete or equivalent as approved by the City Engineer. Surfacing of collector, minor and local streets in business areas shall be 8 inches of Portland cement concrete or equivalent as approved by the City Engineer. Surfacing of all streets in industrial areas shall be no less than 9 inches of Portland cement concrete. Surfacing of primary and secondary arterial streets shall be not less than 8 inches of Portland cement concrete. Surfacing of local streets in R-1 Residential Districts shall be made in accordance with zoning regulations for those districts, with approval of the City Engineer.
3. Sidewalks shall be constructed of Portland cement concrete, no less than 4 inches thick, and no less than 4 feet in width, on both sides of every street in accordance with standards and specifications approved by the Planning and Zoning Commission and City Engineer. Sidewalks may be waived by the Council upon recommendation of the Commission in the R-1 Rural Estate Residence District, where lots are at least 20,000 square feet in area and lot width is at least 100 feet. They may also be waived in business and industrial areas where pedestrian traffic is infrequent or nonexistent, and not likely to increase as a result of anticipated development.
4. Alleys and service drives shall be graded to the full width of the right-of-way, and shall be provided with an all-weather surface satisfactory to the City Engineer. Such paved width shall be 4 feet less than the dedicated right-of-way unless otherwise specified.
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