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Project No. D-3885-06 <br />Christ Our Savior Catholic Parish <br />deleterious debris and meets the other requirements of the "Materials" portion of this <br />Specification Section. <br />Use of soil containing deleterious debris from the clearing and grubbing operation or <br />from other sources is not permitted. The fill materials shall be placed by the Contractor in <br />horizontal layers not greater than 8 inches thick, measured before compaction. Each layer <br />shall be spread evenly and shall be thoroughly mixed during the spreading to obtain <br />uniformity of material and moisture in each layer. The moisture content of material used <br />for compacted fill should be adjusted to be at or above optimum water content as <br />determined by ASTM DI557. When the water content of the fill material is too high, the <br />fill rnaterials shall be aerated by the Contractor by blading, mixing, or other satisfactory <br />methods until the water content is as specified. <br />After each layer has been placed, mixed, and spread evenly, it shall be thoroughly <br />compacted by the Contractor to a relative compaction of at least 90 percent ol the <br />maximum dry density as determined by ASTM DI557 for general fill, and 95 percent of <br />the maximum dry density as detennined by ASTM D1557 for select fill, compacted fill <br />pads, and the upper I foot of pavement subgrade. Compaction shall be accomplished by: <br />sheepsfoot rollers; vibratory rollers; multiple-wheel, pneumatic-tired rollers; or other <br />types of acceptable compacting equipment. Equipment shall be of such design that it is <br />able to compact the fill to the specified density. Compaction shall be continuous over the <br />entire area, and the equipment shall make sufficient passes to obtain the desired density <br />uniformly. All fill placed on site shall be treated in like manner until finished grades are <br />attained. Jetting, puddling, and hydro consolidation techniques shall not be used, <br />including backfill of utility trenches. <br />The placement oftopsoil is subject to the approval of the Geotechnical Engineer. Topsoil <br />shall not be placed beneath concrete flatwork. beneath or behind retaining walls. or within <br />structural fill. All topsoil material is subject to the same moisture conditioning, <br />63 <br />I <br />I <br />T <br />t <br />t <br />T <br />T <br />I <br />T <br />I <br />T <br />T <br />I <br />I <br />I <br />n <br />T <br />I <br />I