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- 3- <br />be compacted to 90 percent of the maximum density as determined by <br />laboratory testing conducted in accordance with ASTM D 1557. Fill ma- <br />terials shall be placed such that the maximinn thickness of loose ma- <br />terial does not exceed 10 inches in thickness. <br />The compaction, as specified above, shall be obtained by the use of <br />sheepsfoot rollers, multiple-wheel pneumatic-tired rollers, or other <br />types of suitable compaction equipment approved by the Engineer. Com- <br />paction shall be accomplished while the fill material is at the specified <br />moisture content. Compaction of each layer shall be continuous over <br />its entire area and the compaction equipment shall make sufficient trips <br />to insure that the required density is obtained. <br />No lenses or layers of high permeable fill will be allowed to extend <br />horizontally through the embankment. Within a given zone of the fill <br />the borrow soils shall be of substantially the same plasticity and <br />permeability characteristics. <br />9. COMPACTION OF SLOPES <br />Fill slopes shall be compacted by means of sheepsfoot rollers or <br />other suitable equipment. Compacting operations shall be continued <br />until the slopes are stable, but not too dense for planting, and there is <br />no appreciable amount of loose soil on the slopes. Compacting of the <br />• slopes may be done progressively in increments of three to five (3' to 5') <br />in fill height or after the fill is brought to its total height. Per- <br />manent fill slopes shall not exceed 2:1 (horizontal to vertical). <br />10. DENSITY TESTS <br />Field density tests shall be made by the Soils Engineer of the com- <br />paction of fill at locations and depths of his choosing. Where sheepsfoot <br />rollers are used, the soil may be disturbed to a depth of several inches. <br />Density tests shall be taken in the compacted material below the disturbed <br />surface. When these tests indicate that the density or moisture content <br />of any layer of fill or portion thereof is below the required density or <br />moisture content, the particular layer or portion shall be reworked until <br />the required density or moisture content has been obtained. <br />11. OBSERVATION AND TESTING <br />Observation by the Soils Engineer shall be continuous during the <br />filling and compacting operations so that he can declare that the fill <br />was made in accordance with accepted specifications. <br />12. SEASONAL LIMITS <br />No fill material shall be placed, spread or rolled while it is <br />frozen, or thawing, or during unfavorable weather conditions. When the <br />• <br />