(a) After installation of all utilities and prior to placement of curb and gutter, the entire subgrade shall be compacted to 95% of standard proctor density for a depth of 8 inches. The area shall be proof-rolled in the presence of the city representative. Areas found to be loose, yielding or composed of unsuitable material, whether located in the subgrade or located deeper, shall be undercut, backfilled with suitable material and properly compacted. The use of a structural fabric to stabilize a soft subgrade may be allowed by the city if it can be demonstrated that this method will provide adequate stability.
(b) Subgrade compaction tests shall be performed by a qualified geotechnical firm, provided by the contractor and approved by the city.
(c) Compaction tests shall be made for every 3,000 square feet of road bed. Additional tests may be required by the city if there is uncertainty about the uniformity of the compaction.
(d) Preparation and shaping of the subgrade shall be in accordance with NCDOT Section 500, Fine Grading Subgrade, Shoulders and Ditches.
(Ord. of 11-7-16, No. 10-16)