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�`�(•) MORRISON-KNUOSEN COMPANY,INC. <br /> s Gradation analyses <br />`• Foundation Material - <br /> • Gradation analyses <br /> • Water content and dry density determination <br /> • Consolidation tests <br /> 9 Triaxial shear tests <br /> • Permeability tests <br /> A detailed description of the method and results of the tests can <br /> be found in the report by Wahler and Associates. <br /> 1 .6.2.2 Analysis of Test Results <br /> Coal Refuse Material <br /> The gradation analyses show that 90 percent. of the material is -3"' <br /> and about 55 percent. is -1/4" size. The maximum and minimum dry densities <br />�• are comparable- to those determined for coarse coal refuse material in <br /> western coal mines by USBM researchers (Physical Properties of Western Coal <br /> Waste Material ; USBM RI8216).. <br /> The shear strength. characteristics were determined by triaxial tests <br /> on 6" diameter, " undisturbed" and fabricated samples. From the analysis <br /> of the laboratory results along with .considerations of the published results <br /> on similar coal waste material by USBM and D"Appolonia researchers, the physi- <br /> cal characteristics of the coal waste material have been estimated as shown <br /> in Table 1 .6.2.2-1 . <br /> Foundation Material <br /> The foundation material under the existing refuse pile is classified <br /> mostly as gravelly, silty to clayey sand. The foundation material at the <br /> . location of drill hole No. 5, 3 and 6 contains sandy clay layers. The ex- <br /> 1-16 <br />