In dry trenches, backfill materials shall be placed evenly and carefully around and over pipe in 12-inch maximum layers, each layer being thoroughly compacted, until one foot of cover exists above the crown of the pipe. The remaining trench portion up to the pavement base shall be back-filled in layers not exceeding eight inches with each layer being compacted to 100% and tested at intervals of 100 feet maximum before placing succeeding layers. Swale area shall be compacted to 98% of maximum. Testing shall be conducted by the City Inspector as necessary. All materials shall be able to pass through a six-inch ring. Laboratory testing for the optimum moisture and maximum soil density shall conform to the specifications of AASHTO T-99-C (Standard Proctor). Restoration of the roadway shall be in accordance with City Standards R-26, R-27, R-28, R-29 and R-20 attached herewith.
(Ord. 972, passed 11-6-91; Am. Ord. 2021-02, adopted 3-17-21; sought to be reconsidered, Commission passed 4-21-2021)