Subgrade is the unimproved earth below the pavement structure, shoulders, or other appurtenances.
(A) All city streets and sidewalks shall be constructed with a four inch thick minimum layer of granular subgrade beneath the pavement.
(B) Construction specifications. The contractor is responsible to prepare subgrades properly graded to the lines and grades shown on the plans for the given project and according to IDOT Standard Specifications Section 301 except as otherwise noted.
(C) The standard laboratory density shall be the A minimum 95% compaction as determined by ASTM Specifications D-698 for clayey materials and a minimum relative density of 95% as determined by ASTM Specifications D2049 for granular materials.
(D) Compaction shall be achieved with a roller capable of properly compacting the given type of embankment material; in the case of fine-grained soils, a sheepsfoot roller is required.
(Ord. 2009-21, § 18.5-3-12, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)