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fill surface at a uniform rate and in such quantity as to permit <br />a satisfactory construction procedure. Unnecessary concentration <br />of travel tending to cause ruts and uneven compaction shall 6e <br />avoided. Before placing each successive layer, all ruts and <br />other hollows more than six I6) inches in depth shall be regraded <br />and compacted. Fill material shall be spread by approved methods <br />in approximately horizontal lifts. These lifts shall not be <br />greater than eight (8) inches in thickness after compaction. <br />Thicker lifts may be used only if it can be demonstrated ade- <br />quately in the Yield, by a test section, that uniform compaction <br />can be achieved. The material in each layer, while being com- <br />pacted, shall be at approximately optimum moisture content, as <br />determined by the Geotechnical Engineer's field representative. <br />As moisture is added to the material in <br />each layer, it shall be thoroughly mixed into the layer by suit- <br />able equipment prior to compaction. Water shall be delivered to <br />the soil by means of a spreader bar which distributes the water <br />approximately uniformly over the fill area. If, in the opinion <br />of the Geotechnical Engineer, the moisture content cannot be <br />uniformly obtained by adding water on the fill surface, the <br />moisture shall be added in the borrow excavation. Water used <br />during earthwork shall be obtained in accordance with the provi- <br />sions of the regulations of the agency governing the use of water <br />and water meters. <br />When the moisture content and condition <br />of each spread layer is satisfactory, it shall be compacted by an <br />• approved method to the recommended relative compaction based on <br />15 <br />