(A) Street grading. Streets shall be graded in accordance with a plan approved by the City Engineer. In the case of an urban street design the grading shall include the entire width of the right-of-way and shall provide a boulevard section, in addition to the minimum pavement width. The boulevard sections for urban roadways shall be graded to maintain the integrity of the abutting topography. The City Engineer shall review each plan with the developer to determine the best possible alternative for grading the boulevards. This may include construction of retaining walls or other construction to stabilize roadside banks and maintain existing trees or environmental aspects of a development. As recommended by the City Engineer, and approved by the City Council, the grades within the boulevard section for an urban roadway shall be 2% in the first four feet behind the curb. From this area, the boulevard grades shall match the existing topography at a grade not to exceed 3%.
(B) Street pavement. The design of street pavement for all streets covered by this regulation shall be in accordance with the state’s Highway Department Road Design Manual No. 5-291 for flexible pavements. The designed thickness of the surfacing elements shall be in accordance with the flexible pavement design standard for road classifications as shown below. However, a minimum of six inches of class 5 aggregate base and three inches of bituminous surfacing is required. This bituminous surfacing shall consist of one and one-half inches of bituminous base course and one and one-half inches of bituminous wear course. More stringent design may be required by the City Engineer based on soil borings provided by the developer. The final bituminous wear course shall be placed no sooner than one year after the date that the bituminous base course is placed. Immediately prior to the placement of the bituminous wear course, any roadway settlements or other pavement damage shall be repaired by the developer.
(C) Street design.
Street Classification | Pavement Design: Axle Load |
Arterials, collector street needs | As determined by traffic |
Local streets | 7-ton minimum |
(D) Soil tests. To determine subgrade soil classifications, soil samples shall be collected and analyzed by an independent, certified testing laboratory. Reports of the soil analysis shall be submitted to the engineer with the pavement plans. Soil samples shall be taken along the center line of the proposed road at intervals not exceeding 300 feet.
(E) Curb and gutter. Concrete curb and gutter can be constructed on both sides of urban design streets. Where applicable, curbless roads shall be designed to encourage stormwater infiltration. Where required, the construction of concrete curb and gutter shall be in accordance with state’s Department of Transportation and shall be either barrier or surmountable type curb as directed by the City Council. Bituminous curbs will not be allowed.
(F) Boulevards. All boulevards shall have four inches of top soil (black dirt) placed on them and then be seeded or sodded.
(G) Sidewalks and pedestrian ways. All required walks shall be concrete four inches thick placed on a four-inch gravel base. Grades shall be approved by the City Engineer. Sidewalks shall be placed in the public right-of-way.
(H) Aggregate shoulders. The aggregate shoulders constructed on rural design roadways shall consist of a four-foot wide section consisting of two inches of class 2 aggregate.
(Prior Code, § 12-1427) (Ord. 2004-5, passed 6-15-2004; Ord. 03-2017, passed 3-21-2017) Penalty, see § 160.99