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(` ?'`•J MORRISON-KNUDSEN COMPANY,INC. <br /> TABLE 1 .3. 3.-2 <br /> • PHYSICAL PROPERTIES OF REFUSE <br /> AND FOUNDATION MATERIAL <br /> MATERIAL ANGLE OF FRICTION COHESION DENSITY <br /> degrees (psf pcf <br /> Coal Refuse 260 1100 90 <br /> Soil Foundation 300 500 90 <br /> As mentioned earlier, a drilling, sampling and laboratory geotechni- <br /> cal testing program was completed to determine the actual material charac- <br /> teristics of the refuse pile and foundation. The details of the program <br /> will be reported in a later report section. <br /> 1 .3.4 Geology <br /> C� <br /> The Mid Continent mines are located in the Coal Basin area of the <br /> Carbondale coal field. The elevation in the basin varies between approxi- <br /> mately 7000 and 11 ,800 feet. Coal Basin is an anticline with Mancos shale <br /> as most of the floor of the anticline. The Mancos shale is easily erodable <br /> and generally of low competence. Faulting is widely present in the area, <br /> and most of the drainages, such as Bear Creek and Dutch Creek, are controlled <br /> by faulting (this information gained through correspondence with Mid-Con- <br /> tinent) . <br /> 1 .3.5 Hydrology <br /> The coal basin area is drained by Coal Creek, a perennial stream. The <br /> present refuse pile is located along the south side of Coal Creek, between <br /> Dutch Creek and Bear Creek. One of the alternate sites will be located in <br /> C� <br /> 1-7 <br />