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<br />6.8 Compaction Equipment <br />' 6.8.1 ne <br />' , The Contractor shall provide sufficient compaction equipment of the types and sizes specified <br />herein as is necessary for the various fill materials specified herein. The Contractor will be <br />' permitted to use alternative equipment, provided the Contractor can demonstraue to the Engineer <br />that such equipment will adequately compact the fill material to a density not less than that <br />which would be produced by the equipment specified; and that no undesirable features, such as <br />segregation or stratification, will occur with the proposed alternate equipment. If the Contractor <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 be maintained in <br />good condition at all rimes 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 />6.8.2 Tam~ing_Rollers <br />' Description <br />Tamping rollers with aheavy-duty, double drum unit shall be of the sheepsfoot type and shall <br />have a minimum ballasted weight of 4,000 lbs per ft of width. The drum shall be water or sand- <br />1 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 Ibs per sq inch, but not to exceed 750 lbs 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 />-~s.. <br />1 <br />