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n <br />U <br />-3- <br />and where water percolates down through the near-surface soils it tends <br />to perch on the surface of the relatively unweathered formation rock. <br />Detailed foundation conditions are discussed under 'Subsurface Conditions.' <br />INVESTIGATION <br />The field investigation at this site included a reconnaissance of <br />the proposed spoil disposal areas and drilling 14 exploratory borings <br />at approximately the locations indicated on Fig. 1. The borings were <br />drilled with a 4-inch diameter continuous flight power auger. Samples <br />were taken at approximately 5-foot intervals. To determine the relative <br />stiffness of the materials encountered, standard penetration tests were <br />• also made at about 5-foot intervals. Our field engineer was on-site to <br />direct location of the borings, establish sampling intervals and log <br />the material encountered in each boring. Graphical representation of <br />the materials encountered in each boring is presented on Figs. 16 through <br />19. Typical samples of all materials were returned to our laboratory for <br />further analysis and testing. <br />In addition to the borings, field density tests were made in exist- <br />ing spoil piles and haul roads. Large samples of overburden spoil were <br />obtained from the existing mine to evaluate the spoil properties for <br />the proposed mine extensions. <br />Laboratory analysis included Atterberg limits, swell-consolidation, <br />unconfined compressive strength tests to evaluate strength, and shear <br />tests on both natural and remolded samples to evaluate characteristics <br />• of the near-surface soils and underlying bedrock. <br />