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ASTM D 4254 Test Methods for Minimum Index Density of Soils and <br /> Calculation of Relative Density. <br /> 4.2 American Association of State Highway and Transportation Officials (AASHTO) <br /> AASHTO T 103. (Resistance of riprap to freeze/thaw.) <br /> 5 LINES AND GRADES <br /> 5.1 The Owner shall provide engineering surveys for construction to establish <br /> reference points which in his or her judgment are necessary to enable the <br /> Contractor to proceed with the work. <br /> 5.2 Contractor shall be responsible for laying out the work and for slope grade <br /> control. <br /> 5.3 The Engineer reserves the right to verify correctness of the layout of the work <br /> and slope grades during the progress of the work. <br /> 5.4 The Contractor will preserve and maintain all bench marks and reference points <br /> established by the Engineer and shall not make changes or relocations without <br /> the prior written approval of the Engineer. Where bench marks and references <br /> will unavoidably be destroyed by the construction, Contractor shall establish <br /> temporary or secondary reference points outside of the construction area before <br /> the bench marks are demolished, and shall protect and maintain such temporary <br /> points during construction. <br /> 6 MATERIALS <br /> 6.1 GENERAL <br /> 6.1.1 Earth materials specified herein shall be free of topsoil, organics or <br /> other deleterious material and meet the gradation requirements <br /> stated in this section. Earth materials are designed to possess <br /> certain characteristics such as high density, high strength and low <br /> compressibility and they shall be placed in such a way that the <br /> desired characteristics are obtained. <br /> SPEC.A- EARTHWORK <br /> PAGE 3 <br />