1989-10-10_REVISION - M1988112 (16)

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shall be subject to approval by the Engineer. Except as otherwise • specified, or approved by the Engineer, compacted fill materials shall be placed on moist surfaces. The distribution of materials within any given zone shall be such that the fill is free from lenses, pockets, streaks, or layers of material differing substantially in texture or gradation from the surrounding material. The combined borrow excavation and fill placement operation shall be such that the materials, when placed within the fill areas, shall be blended sufficiently to secure the best practicable distribution of the material, subject to the approval of the Engineer. Mhere the gradations of two materials are not compatible, in the opinion of the Engineer, the Contractor shall place and compact, as specified, not less than two ft of material of an intermediate gradation between the incompatible materials. If, in the opinion of the Engineer, the surface of the prepared foundation or the surface of any layer of the fill is roo dry or too • 1 smooth to bond properly with the layer of material to be placed thereon, it shall be moistened and/or worked with a harrow, scarifier, or other equipment to provide a satisfactory bonding surface before the next layer of fill material is placed. If, in the opinion of the Engineer, the prepared foundation surface is too wet for proper compaction of the fill material to be placed thereon, it shall be removed and allowed to dry or shall be worked with a harrow, scarifier, or other equipment to reduce the moisture content to the required amount, and then compacted before the next layer of fill material is placed. Unless otherwise approved by the Engineer, the slope of rock or cemented soil surface against which compacted fill is to be placed shall not be steeper than 1H:1V and no steeper than 2H:1V in the case of foundation soil surfaces. 20