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Tractors used for pulling compaction equipment shall have <br />• sufficient power for the most adverse conditions to be <br />encountered during compaction of the fill and when the <br />compaction equipment is ballasted to the maximum weight <br />specified. Compaction equipment shall be maintained in good <br />condition at all times to obtain the maximum degree of <br />compaction for the equipment being used. The Contractor shall <br />immediately make adjustments to the equipment to achieve <br />optimum results when required by the Engineer. <br />The Contractor shall be in a position to provide and use, <br />as specified, the following types of compactors. <br />6.6.2 Tamoina Rollers <br />Description <br />Tamping rollers with a heavy-duty, double drum unit shall <br />• ~ be of the sheepsfoot type and shall have a miniimum ballasted <br />weight of 4,000 lbs per ft of width. The drum shall be water <br />or sand-and-water ballasted. Each knob shall project a minimum <br />of seven inches from the drum. The projected face area of each <br />tamping knob and the number of and spacing of the knobs shall <br />be such that the total weight of the ballasted roller, when <br />distributed over one row of knobs, will result in a minimum <br />pressure of 500 lbs per sq inch, but not to exceed 150 lbs per <br />sq inch. The roller shall be equipped with cleaning fingers <br />so designed and attached as to prevent an accumulation of <br />material between the tamping feet. <br />Tvoes of Tamoina Rollers <br />The roller shall be self-propelled or pulled by a <br />crawler-type tractor of sufficient power to operate the roller <br />at a speed of approximately 3 mph. The design and operation <br />• of the roller will be subject to approval of the Engineer, and <br />28 <br />