(A) Where unsuitable material occurs within the limits of the roadway, the contractor shall remove such material and refill with suitable excavated material or authorized borrow. Where unsuitable material is removed, the surface of the excavated area shall be compacted by rolling with a sheepsfoot roller exerting a compression of at least 250 pounds per square inch on the tamper feet, for the full width of the roadbed (subgrade and shoulders). Such rolling shall be done before any refill is begun, and shall be continued until the roller does not penetrate the surface more than one inch.
(B) When the plans contain the results of a soil survey, do not assume such data is a guarantee of the depth, extent, or character of material present.
(C) Where muck, rock, clay, or other material within the limits of the roadway is unsuitable in its original position, excavate such material to the cross-sections shown in the plans or indicated by the Engineer, and backfill with suitable material. Shape backfill material to the required cross-sections.
(D) Where the removal of plastic soils below the finished earthwork grade is required, meet a construction tolerance, from the lines shown in the plans as the removal limits, of ± 0.2 feet [± 60 mm] in depth and ± 6 inches [± 150 mm] (each side) in width.
(2000 Code, § 58-252) (Ord. 88-01, passed 5-24-1988; Ord. 2010-05, passed 4-27-2010) Penalty, see § 10.99