(A) Concrete streets.
(1) Concrete minor and collector streets, as defined in the subdivision ordinance of the city, shall be constructed on a six-inch natural soil base, approved by the City Engineer and shall consist of 3,000 p.s.i. concrete pavement, a minimum thickness of five inches, a width of at least 32 feet for collector streets and 27 feet for minor residential streets. All other concrete streets shall be constructed on a six-inch natural soil base, approved by the City Engineer, and shall consist of 3,000 p.s.i. concrete pavement, a minimum thickness of six inches and width of at least 68 feet for primary arterial thoroughfares, 72 feet for primary arterial thoroughfares with limited easements and 42 feet for secondary arterial thoroughfares.
(2) All concrete residential streets shall be equipped with curbs as an integral part of the concrete street. The concrete curbs shall have a slope width of two inches (or.8-inch radius chamfer) from base to crown and a height of six inches from base to crown. The curb crown shall be a minimum of six inches wide and curb height from the surface of the soil base to the crown shall be 11 inches.
(3) Concrete residential street tests shall consist of quality control for concrete and density tests when required of the developer or subdivider and directed by the Street Department Superintendent, City Manager or City Engineer, in accordance with State Highway Standard Specifications for Highway Construction:
(4) Concrete curing shall be accomplished by the contractor, in accordance with §§ 414.04-7(m) and 701.07 of the specifications of the State Highway Commission.
(5) All concrete residential streets, sidewalks and curbs shall be constructed using an approved 3,000 p.s.i. concrete. During placement and prior to finishing, a minimum of three test cylinders shall be made by the developer or contractor and tested for each 80 cubic yards of concrete placed. When quantities do not meet the 80-cubic yard amount, test cylinders shall be made and tested as required by the Street Department Superintendent, City Manager or City Engineer.
(6) Thickness verification tests shall be accomplished under the direction of the City Engineer, City Manager or Street Department Superintendent at the time of and during pavement placement.
(B) Asphaltic streets.
(1) Asphaltic streets shall be constructed upon a six-inch compacted subgrade.
(2) The street layer above subgrade shall consist of three inches of Type “A” asphalt or three inches of Plant Mix Bituminous Base Fine Aggregate Type asphalt shall be applied in accordance with § 314.01 of the State Highway Commission Standard Specifications for Highway Construction, current edition.
(3) The top street layer shall consist of concrete curbs and gutters, and the combined width of the asphalt surface and ten inches of concrete gutter shall conform with minimum widths as outlined for concrete streets.
(4) Curbs and gutters on asphalt streets shall be an integral unit consisting of a gutter with a surface width of ten inches, a curb slope width of two inches (or .50-inch radius chamfer) from base to crown and a height of six inches from base to crown.
(5) The curb crown shall be a minimum of six inches wide and the combined curb and gutter height from the surface of the compacted sub-grade to the crown shall extend a total of 12 inches.
(6) In all cases, the Type “C” asphalt surface shall extend one-fourth inches above but not covering the surface of the concrete gutters.
(C) Bases and subgrades. Street bases and subgrades shall consist of a total minimum thickness of six inches and shall in all cases extend at least ten inches beyond the backs of all concrete curbs.
(D) Joints and cuts. Concrete streets shall be equipped with expansion joints which shall be placed at intervals of every 100 feet and installed latterly along the pavement width. Soil cuts shall be made at intervals of every 25 feet.
(E) Asphalt streets for subdivisions platted prior to 1975.
(1) Asphalt streets installed on virgin soil shall be constructed upon a 2% crowned roadbed having a six-inch gravel compacted subgrade sealed with an oil coat and three inches of type A asphalt.
(2) Existing streets shall be asphalt paved upon a 2% crowned roadbed having a four-inch gravel compacted subgrade sealed with an oil prime coat and two inches of Type A asphalt.
(3) Before street construction begins, street and drainage specifications will be submitted to and approved by the Planner or his or her duly authorized representative.
(`90 Code, § 16-8) (Ord. 2831, passed 10-20-87)