§ 22-29. Streets.

(a)

All streets shown on the approved subdivision plat, shall be graded the width of the right-of-way to grades and cross sections approved by the city engineer and the design standards of division 4 of article II of this chapter.

(b)

All local residential streets shall be surfaced with a minimum of six (6) inches of Class A (3,500 psi) Portland cement concrete on a six (6) inch compacted stone base and compacted subgrade, or six (6) inches of asphaltic concrete (spec MoDOT B-1) on a six (6) inch compacted stone base and compacted subgrade. Compacted subgrade for all pavement types shall be six (6) inches minimum and ninety-five (95) percent of the standard maximum density.

Prior to beginning any work on street subgrade, the contractor shall secure the services of a qualified independent testing agency to acquire samples of the material to be used for subgrade construction. These samples shall be analyzed to determine proctor values, liquid limits, and plasticity index. Copies of the analysis shall be provided to the city engineer for review prior to commencing any subgrade preparations. If it is determined that fly ash modification is required, the following guidelines shall be followed:

(1)

The contractors independent testing agency shall determine the areas to be modified, the amount of fly ash to be used (percent by weight), and depth to be tilled.

(2)

Construction of pavements on high plasticity soils shall be modified with Class "C" fly ash, or replaced with lower plasticity soils. High plasticity soils shall be defined as soils with a liquid limit greater than fifty (50) and a plasticity index greater than thirty (30).

(3)

The subgrade surface shall be brought to the specified lines, grades and cross-sections by repeatedly adding or removing material and compacting to the specified density with suitable compaction equipment to perform these operations.

(b)

All residential streets shall be surfaced with a minimum of six (6) inches of Portland cement concrete on a compacted subgrade, or five and five tenths (5.5) inches of hot mix asphalt on a six (6) inch aggregate base.

(c)

Construction of streets shall be in accordance with city specifications.

(d)

All streets shall be provided with curb and gutter which shall be one of the types which are approved by the city engineer, and shall be constructed of Portland cement concrete.

(e)

Prior to placing the street surface, adequate subsurface drainage for the streets and all utilities under the streets shall be installed by the subdivider.

(f)

The subdivider shall reimburse the city for providing and installing street signs, as approved by the traffic committee.

(Ord. No. 11367, 2-1-99; Ord. No. 12170 , § 2, 9-21-2015)