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�•) MORRISON-KNUDSEN COMPANY,INC. <br /> This assumption was to be "verified by the field and laboratory investiga- <br /> C• tion subsequently performed. <br /> During this prelimina''ry study, no specific data were available regard- <br /> ing the physical characteristics of the refuse and the foundation material . <br /> i <br /> The United States Bureau of Mines, along with various consulting companies, <br /> has performed a number of studies concerned with coal refuse piles, and. <br /> some material characteristics are cited in various publications (USBM RI <br /> 7964, 8062, 8069, 8216, "Engineering and Design Manual , Coal Refuse Dis- <br /> poposal Facilities", by D'Appolonia) . Table 1 .3.3-2 shows the physical pro- <br /> perties of the material assumed for the present study. <br /> TABLE 1 .3.3-1 <br /> AVERAGE REFUSE MATERIAL SIZE AS MEASURED IN-PLANT <br /> SIZE PERCENT <br /> +2" 25.4% <br /> 211xl/2" 40.4% <br /> 1/2"xl/4" 11 .7% <br /> 1/4"x6M 4.2% <br /> 6Mxl0M 3.0% <br /> r <br /> . 10Mx28M 5.6% <br /> 28Xx60M 5.4% <br /> 60Mxl00M 2.1% <br /> -100M 2.2% <br /> 100.0% <br /> 1-6 <br />