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the Contractor shall at any time make such minor alterations <br />• or adjustments to the operations or equipment, as directed by <br />the Engineer, to secure optimum compaction. <br />Hand-Operated Tampers <br />Pneumatic tampers or gasoline-powered rammers may be used <br />in areas where it is impractical or undesirable to use tamping <br />rollers. The operation of the hand-operated tampers shall be <br />subject to the approval of the Engineer and shall result in <br />compaction to the level specified. <br />6.6.3 Pneumatic-Tired Rollers <br />Pneumatic-tired rollers shall have a minimum of four <br />wheels equipped with pneumatic tires, and a body suitable for <br />ballast loading such that the load per wheel can be varied up <br />to 30,000 lbs. The roller wheels shall be located abreast and <br />• ~ be designed such that each wheel exerts approximately the same <br />load under any condition likely to be encountered during its <br />use, especially conditions met in traversing uneven ground. <br />The tires shall be such that tire pressures during roller <br />operations can be maintained at approximately 90 lbs per sq <br />inch. The spacing of the wheels shall be such that the distance <br />between adjacent tire imprints during rolling will not be <br />greater than 50 percent of the width of a sing'ie tire. <br />6.6.4 Drum Rollers <br />Drum rollers shall be of the smooth, single steel-drum <br />type and shall be equipped with a suitable cleaning device to <br />prevent the accumulation of material on the drum during <br />rolling. Each roller shall have a total static weight of not <br />less than 10 tons with at least 90 percent of this weight being <br />transmitted to the ground through the drum when the roller is <br />• standing on level ground and attached to the pulling equipment. <br />29 <br />