A. All roads shall be constructed with a sub-base course of non-frost-susceptible material with no more than 10 percent of weight passing the Number 200 sieve. The minimum depth of sub-base shall be as follows:

The depth of sub-base shall be measured from the point of the highest projection into the roadway prism.

B. All roads shall be constructed with a base course of two-inch minus rock with no more than 10 percent of weight passing the Number 200 sieve and a plasticity index of not greater than four as determined by AASHTO T-90. The minimum depth of base course after compaction shall be as follows:

C. All roadway construction shall have all organic material removed to the depth of the required sub-base prior to placement or construction of the sub-base in the transition area from cut to fill.

D. The right-of-way shall not be clear cut unless necessary to meet the road construction standards of this chapter. All stumps shall be flush cut.

E. All construction shall be contained within the right-of-way except where the taking of additional slope easements is noted on the plat and additional easements are provided for utilities.

F. All construction shall be done in accordance with the latest edition of the Alaska Department of Transportation and Public Facilities Standard Specifications for Highway Construction.

G. Geotextiles may be used upon submittal of satisfactory supporting data from a registered engineer and approval by the engineering and facilities department director. [Ord. FY2020-02 §10, 2019; Ord. 90-15 §2, 1990].