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-8- <br />• head permeability tests were cond.~cted on relatively undisturbed <br />samples of the subsoils. <br />The swell-consolidation tests .+e re conducted to determine the <br />compf•ession or expansion characteristics of the samples under <br />loading and wVien subrierged in water. The direct shear tests were <br />conducted to determine shear st•ength 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 the percentage of water soluble sulfates, <br />Results of the laboratory ~~esting program are shown on <br />Figs. 6 through 19 and in the attached Summary of Laboratory Test <br />Results, Table I, The laborat~~ry testing was conducted in <br />• general accordance with applicable ASTM standards. <br />SUBSURFACE COPIDITIONS <br />The subsoils encountered at flee 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 si lty sands and gravels with <br />cobbles and boulders, The alluvial fan deposits were encountered <br />to the maximum depth explored of 'i1 feet. Consistency or density <br />of the soils ranged from medium dense to dense for the granular <br />zones and stiff to hard for the clay zones. In the lower part of <br />the site, Holes 10 and 11, stiff to very stiff gravelly clays <br />were. encountered. No free water was encountered in the explora- <br />Chen & Associates <br />