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- 31 - <br />LABORATORY TESTING <br />Samples obtained from our exploratory test pits were examined and <br />classified in the laboratory by the project soil engineer. Laboratory <br />testing was performed on the samples obtained to determine their index <br />properties and engineering properties. Samples of crushed low -grade <br />ore from the JD-5 lease were provided to us by Hazen Research, Inc. <br />The drainability of this low -grade ore was studied by a series of <br />tests. The results of the laboratory testing are shown on the Summary <br />of Laboratory Test Results, Table I, and on Figs. 11 through 21, and a <br />discussion of the laboratory testing is presented below. The testing <br />was conducted in general accordance with accepted test procedures of <br />the American Society of Testing Materials (ASTM) and U.S. Bureau of <br />Reclamation (USBR). <br />Index Properties: In order to identify soils and classify them into <br />categories of similar engineering properties, standard classification <br />methods have been developed. The Unified Soil Classification System <br />(ASTM D-2487) is a common method of identifying soils. The system is <br />based on index property tests, including the determination of natural <br />Iter content (ASTM D- 2216), liquid limits (ASTM D -423), plastic <br />nits (ASTM D -424) and grain size distribution curves (ASTM D -422). <br />hilts of the natural moisture content, dry density and Atterberg <br />units testing are presented on Table V. Grain size distribution <br />.curves for samples of the granular soils obtained at the site are <br />;shown on Figs. 13 through 15. <br />ineering Properties: A direct shear test (ASTM D -3080) was <br />'conducted on samples of the cohesive foundation materials encountered <br />