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• -g- <br />head permeability tests were conducted on relatively undisturbed <br />samples of the subsoils. <br />The swell-consolidation tests •.+ere conducted to determine the <br />compression or expansion charact~:ristics of the samples under <br />loading and when subrtierged in water. The direct shear tests were <br />conducted to irtermine shear strength parameters of the soil <br />sample. The permeability tests were conducted on samples of the <br />subsoils taken in the proposed sedimentation pond area to help <br />evaluate infiltration rate. Chemical testing was performed on <br />samples to determine tl~e percentage of water soluble sulfates. <br />Results of the laboratory testing program are shown on <br />Figs. 6 through 19 and in the attached Summary of Laboratory Test <br />Results, Table I. The laboratory testing was conducted in <br />general accordance with applicable ASTt•1 standards. <br />SUBSURFACE CONDITIONS <br />The subsoils encountered at ttie site are somewhat erratic <br />with respect to type, depth and engineering characteristics, The <br />subsoils are predominantly alluvial fan deposits consisting of <br />sandy clays and clayey sands with varying gravel, cobble and <br />boulder content and clayey to silty sands and gravels with <br />cobbles and boulders. The alluvial fan deposits were encountered <br />to the maximum depth explored of ']1 feet. Consistency or density <br />of the soils ranged Crom medium dense to dense for the granular <br />zones and stiff to hard for ttie clay zones. In the lower part of <br />the site, Holes 10 and 71, stiff to very stiff gravelly clays <br />were encountered. No free water was encountered in the explora- <br />Chen & Associates <br />