§ 11-122. Roadway excavation and embankment.

(a)

Suitable material shall consist of soil or a mixture of soil, stone or gravel. It shall be free of sod, logs, stumps, roots and other deleterious matter; and it shall be capable of forming a stable embankment when compacted.

(b)

All suitable material obtained during the excavating operations shall be used in the construction of the roadway embankments and subgrade, and all unsuitable material shall be used behind the curb or hauled to an approved waste area.

(c)

All roadway cuts and grades shall conform to those shown on the approved plans or approved plan changes.

(d)

Sod and vegetable matter shall be removed from the surface upon which embankment of less than four (4) feet is to be placed.

(e)

Roadway embankment shall be constructed in layers not to exceed eight (8) inches (loose measurement). Each layer shall be compacted at or near optimum moisture for that particular soil to at least ninety-five (95) percent of the maximum density, as determined by AASHTO T 99 (Standard Proctor).

(f)

In areas where solid rock is encountered, it shall be excavated to a depth of eight (8) inches below subgrade elevation and replaced with approved material.

(g)

Rock obtained during excavation operations may be placed in layers not exceeding thirty (30) inches. The rock shall be placed in a manner that the voids between the rock fragments are filled with suitable material. The top twelve (12) inches of the finished subgrade shall not contain rock over four (4) inches in its greatest dimension.

(h)

Embankment which is adjacent to structures and inaccessible to normal compaction equipment shall be placed in four-inch (loose measurement) layers and compacted to at least ninety-five (95) percent of maximum density as obtained by AASHTO T 99. The material shall be compacted with mechanical equipment where it is inaccessible to the normal compaction equipment.

(Ord. No. 91-9, Art. 1, § 4.03, 4-11-91; Ord. No. 99-32, Art. 1, 7-8-99)