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<br />such minor alterations or adjustments to the operations <br />or equipment, as directed by the Engineer, to secure <br />optimum compaction. <br />Hand-Operated Tampers <br />' Pneumatic tampers or gasoline-powered rammers may be <br />used in areas where it is impractical or undesirable to <br />use tamping rollers. The operation of the hand-operated <br />tampers shall be subject to the approval of the Engineer <br />and shall result in compaction equivalent t~~ that as <br />1 specified above. <br />1 6.9.3 Pneumatic-Tired Rollers <br />' Pneumatic-tired rollers shall have a minimum of four <br /> wheels equipped with pneumatic tires, and a body suitable <br />' for ballast loading such that the load per wheel can be <br />i <br />d <br />30 <br />000 lb <br />t <br />Th <br />ll <br />h <br />l <br />h <br />ll b <br /> var <br />e <br />, <br />up <br />o <br />er w <br />s. <br />e ro <br />ee <br />s s <br />a <br />e <br /> located abreast and be designed such that each wheel <br /> exerts approximately the same load under any condition <br /> likely to be encountered during its use, especially <br /> conditions met in traversing uneven ground. 1'he tires <br /> shall be such that ti re pressures durin~l roller <br />' operations can be maintained at approximately 90 lbs per <br /> sq inch. The spacing of the wheels shall be such that the <br /> distance between adjacent tire imprints durinc rolling <br />ill <br />b <br />h <br />i <br /> not <br />e greater t <br />w <br />an 50 percent of the w <br />dth of a <br /> single tire. <br /> <br /> 6.9.4 Vibratory Rollers <br />f <br /> Vibratory rollers shall be of the vibratory. smooth, <br /> single steel-drum type and shall be equipped with a <br /> suitable cleaning device to prevent the accumulation of <br /> material on the drum during rolling. Each roller shall <br /> N-19 <br /> <br />