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Prior to the site visit, geologic literature available for the <br /> site was reviewed. Aerial photographs of the area, made available by <br /> Cotter Corporation, were studied and evaluated. <br /> . As a result of this task, an evaluation was made of the <br /> general stability of the area and of the potential impacts on the existing <br /> waste piles , on the future waste piles and on the reclaimed waste piles. <br /> 2 . Physical Properties of Waste Material - The waste pile <br /> material consists of angular fragments of hard rock (amphibolite); it <br /> contains very few fines and has the character of a rockfill . Physical <br /> properties of this material (specifically, the shearing resistance) were <br /> needed for the stability analyses of the pile. As testing of such material <br /> is practically impossible, phjsical properties were estimated by compari- <br /> sion with other, similar materials that have been used on other projects <br /> (specifically, on the construction of rockfill dams where large scale <br /> tests were performed to estimate the shearing resistance) . The size of <br /> the particles, their angularity, gradation, hardness and resistance <br /> against weathering were used as a basis for comparative purposes and for <br /> the evaluation of the physical properties. <br /> The documentation of the waste pile material was made by our <br /> engineers site visits. Cotter representatives provided additional in- <br /> formation on the origin, processing and handling of the waste. <br /> 3. Physical Properties of Foundation Material - The waste pile <br /> is underlain by the in situ foundation material . This material is formed <br /> by bedrock, alluvial soils at the bottom of the valley and by colluvial <br /> soils on both valley sides. Physical properties of alluvial and colluvial <br /> soils were needed for the stability analyses. <br /> Testing of these soils beneath the waste piles would require <br /> drilling through the waste piles and sample collection. The exposed soils <br /> - 3 - <br />