§ 21-27. New streets.

The pavement on any new local residential street shall be at least six (6) inches of Class A (3,500 psi) Portland Cement concrete, plus at least six (6) inches of compacted stone base. An alternate design shall be at least six (6) inches of rolled stone base plus either six (6) inches of asphaltic concrete (spec MoDOT B-1) or four and one-half (4½) inches of asphaltic base course plus one and one-half (1½) inches of asphaltic concrete, unless otherwise specified by the city engineer. Compacted subgrade for all pavement types shall be six (6) inches minimum and ninety-five (95) percent of the standard maximum density. Streets designated as principal arterials, minor arterials, collector, local commercial, or industrial streets require design approval from the city engineer and will be designed to meet current American Public Works Association (APWA) design standards, Section 5200 Streets.

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.

(Code 1974, § 21-9; Ord. No. 12170 , § 1, 9-21-2015)

Editor's note

The ordinance from which this article is derived was approved on March 1, 1965.