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9.3.1 All structural foundation excavation shall be cut to the lines and <br /> grades as shown on the Drawings. <br /> 9.3.2 Soil Foundations. Prior to placing concrete or earth fill materials, <br /> the entire subgrade under these structures shall be proof rolled by <br /> heavily loaded rubber tired equipment. Areas deflecting excessively <br /> under wheel loads, as determined by the Engineer, shall be over- <br /> excavated to soil with suitable density and replaced with Zone 1 fill <br /> material compacted to ninety-eight percent (98%) Standard Proctor <br /> density at near optimum moisture content, in accordance with this <br /> specification. <br /> 9.3.3 Rock Foundations. All rock surfaces shall be clean and fresh prior <br /> to the placement of concrete or earth fill materials. Contractor shall <br /> provide acceptable methods for the protection of rock foundation <br /> areas so as to minimize air-slaking or desiccation of the materials. <br /> Soil, loose rubble, and/or slabs of rock shall be removed to expose <br /> sound, undisturbed rock. <br /> 10 HANDLING AND PLACEMENT OF EARTH MATERIAL <br /> 10.1 GENERAL <br /> 10.1.1 Earth materials shall be handled, transported and stockpiled in such <br /> a manner as to prevent any undesirable segregation or intermixing <br /> of various types of earth materials. <br /> 10.1.2 Earth materials shall be placed in near horizontal layers to the <br /> specified lift thicknesses. Distribution and gradation of materials <br /> throughout the layers shall be such that the placed materials shall <br /> be free from segregated lenses, pockets, streaks or layers of <br /> materials differing in texture or gradation from surrounding material. <br /> 10.1.3 Successive loads of earth materials shall be dumped so as to <br /> provide the best practical distribution of material. <br /> 10.1.4 If the surface of any layer of rolled fill is too dry or too smooth to <br /> bond properly with the layer of material to be placed thereon or has <br /> SPEC.A- EARTHWORK <br /> PAGE 10 <br />