8-1-28: CONSTRUCTION METHODS FOR UNPAVED STREET RESTORATION:
The backfill material shall be deposited in layers not exceeding eighteen inches (18") in thickness prior to compacting. Each layer shall be compacted with suitable mechanical tamping equipment. It shall be compacted sufficiently to obtain a field density which is at least ninety percent (90%) of theoretical density as determined by AASHTO method T-99. Field density shall be determined by AASHTO method T-147. In no event shall water jetting be allowed for compaction of backfill material. (Ord. 8(1991) § 9: Ord. 20(1981) § 1)