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Grading Guide Specifications Page 3 <br />concrete. Ample water and compactive effort should be applied to the fill materials as <br />they are placed in order that all of the voids between each of the fragments are filled <br />and compacted to the specified density. <br />• Subsequent rows of rocks should be placed such that they are not directly above a row <br />placed in the previous lift of fill. A minimum 5-foot offset between rows is <br />recommended. <br />• To facilitate future trenching, oversized material should not be placed within the range <br />of foundation excavations, future utilities or other underground construction unless <br />specifically approved by the soil engineer and the developer/owner representative. <br />• Fill materials approved by the Geotechnical Engineer should be placed in areas previously <br />prepared to receive fill and in evenly placed, near horizontal layers at about 6 to 8 inches in <br />loose thickness, or as otherwise determined by the Geotechnical Engineer for the project. <br />• Each layer should be moisture conditioned to optimum moisture content, or slightly above, <br />as directed by the Geotechnical Engineer. After proper mixing and/or drying, to evenly <br />distribute the moisture, the layers should be compacted to at least 90 percent of the <br />maximum dry density in compliance with ASTM D-1557-78 unless otherwise indicated. <br />• Density and moisture content testing should be performed by the Geotechnical Engineer at <br />random intervals and locations as determined by the Geotechnical Engineer. These tests <br />are intended as an aid to the Earthwork Contractor, so he can evaluate his workmanship, <br />equipment effediveness and site conditions. The Earthwork Contractor is responsible for <br />compaction as required by the Geotechnical Report(s) and governmental agencies. <br />• Fill areas unused for a period of time may require moisture conditioning, processing and <br />recompaction prior to the start of additional filling. The Earl:hwork Contrador should notify <br />the Geotechnical Engineer of his intent so that an evaluation can be made. <br />• Fill placed on ground sloping at a 5-to-1 inclination (horizontal-to-vertical) or steeper should <br />be benched into bedrock or other suitable materials, as direded by the Geotechnical <br />Engineer. Typical details of benching are illustrated on Plates D-2, D-4, and D-5. <br />• CuUfill transition lots should have the cut portion overexcavated to a depth of at least 3 feet <br />and rebuilt with fill (see Plate D-1), as determined by the Geotechnical Engineer. <br />• All cut lots should be inspected by the Geotechnical Engineer for fraduring and other <br />bedrock conditions. If necessary, the pads should be overexcavated to a depth of 3 feet <br />and rebuilt with a uniform, more cohesive soil type to impede moisture penetration. <br />• Cut portions of pad areas above buttresses or stabilizations should be overexcavated to a <br />depth of 3 feet and rebuilt with uniform, more cohesive compacted fill to impede moisture <br />penetration. <br />• Non-structural fill adjacent to structural fill should typically be placed in unison to provide <br />lateral support. Backfill along walls must be placed and compacted with care to ensure that <br />excessive unbalanced lateral pressures do not develop. The type of fill material placed <br />adjacent to below grade walls must be properly tested and approved by the Geotechnical <br />Engineer with consideration of the lateral earth pressure used in the design.