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This paper discusses several methods used by the Bureau of Reclamation for the undisturbed sampling of soils including open-drive piston and double-tube core-barrel sampling. The paper describes in general terms how research studies have resulted in techniques now standardized. Included are recommendations for sampling saturated and unsaturated soils; expansive and nonexpansive materials; and loose, alluvial, and colian soils. An important consideration is the method by which the holes are stabilized with drilling mud.
Clark, K. R.
Office of Chief Engineer, Bureau of Reclamation, Denver, Colo.