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<br />' wishes to use alternative equipment, he shall submit to the Engineer for approval complete <br />details of the equipment and the methods proposed for its use. The Engineer's approval of the <br />use of alternative equipment will be conditional upon the Contractor's construction of test fills <br />at his own expense. Any approval of alternate equipment will not relieve the Contractor from <br />' responsibility of obtaining the specified compaction. <br />Tractors used for pulling compaction equipment shall have sufficient power for the most adverse <br />'' conditions to be encountered during compaction of the fill and when the compaction equipment <br />is ballasted to the maximum weight specified. Compaction equipment shall b. maintained in <br />' good condition at all times to obtain the maximum degree of compaction for the equipment being <br />used. The Contractor shall immediately make adjustments to the equipment to achieve optimum <br />results when required by the Engineer. <br />' The Contractor shall be in a position to provide and use, as specified, the following types of <br />compactors. <br />6.6.2 Tampine Rollers <br />~ , Description <br />' Tamping rollers with aheavy-duty, double drum unit shall be of the sheepsfoor type and shall <br />have a minimum ballasted weight of 4,000 Ibs per ft of width. The drum shall be water or sand- <br />' and-water ballasted. Each knob shall project a minimum of seven inches from the drum. The <br />projected face area of each tamping knob and the number of and spacing of the knobs shall be <br />such that the total weight of the ballasted roller, when distributed over one row of knobs, will <br />' result in a minimum pressure of 500 lbs per sq inch, but not [o exceed 750 Ibs per sq inch. The <br />roller shall be equipped with cleaning fingers so designed and attached as to prevent an <br />' accumulation of material between the tamping feet. <br />Tvoes of Tamoine Rollers <br />' The roller shall be self-propelled or pulled by a crawler-type tractor of sufficient power to <br />' operate the roller at a speed of approximately 3 mph. The design and operation of the roller will <br />be subject to approval of the Engineer, and the Contractor shall at any time make such minor <br />alterations or adjustments to the operations or equipment, as directed by the Engineer, to secure <br />optimum compaction. <br /> <br /> -16- <br /> <br />1 <br />