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content and compacted to at least 90% of the maximum standard <br /> Proctor density prior to fill placement. <br /> Fill for the outer portion of the <br /> slope should be placed in lifts not to exceed 12 inches loose <br /> thickness, and compacted to at least 900/0 of its maximum Proctor <br /> density, ASTM D-698 . Fill material should be brought to the <br /> Proctor optimum moisture content, + 2%, prior to compaction, and <br /> should be compacted by mechanical means . No water flooding <br /> techniques, such as jetting, ponding, or puddling, should be <br /> used in the placement of fill. No particles in excess of 1.0 inches <br /> diameter should be placed in the fill. These placement require- <br /> ments will apply to the outer portion of the fill, where the <br /> potential failure surface is located. We recommend the compaction <br /> Oak <br /> procedures described above for the material from the toe of the <br /> slope to a distance 15 feet beyond the top of the slope.: Material. <br /> located beyond this zone may be spread in lifts not exceeding <br /> 2 feet thickness and tracked into place with a heavy dozer or <br /> similar equipment . Under no circumstances should fill material <br /> be simply "end-dumped" , without being spread or worked. <br /> In order to minimize erosion and <br /> increase stability, the face slopes of fills should be compacted. <br /> Compaction operations shall be continued until the slopes are <br /> stable, but not too dense for planting, and there is no appreciable <br /> amount of loose soil on the slopes . Compacting the slopes may <br /> be done progressively in increments of three to five feet in <br /> full height, or after the fill is brought to its total height. <br /> -10- <br />