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MORRISON-KNUDSEN COMPANY,INC. / <br /> For the proposed expansion sites, various probable slope height and <br /> �• slope angle combinations were analyzed. Selected results of these analyses <br /> are shown in Table 1 .4.1,3-2. <br /> TABLE 1 .4.3-2 <br /> SELECTED RESULTS OF ANALYSIS OF THE <br /> PROPOSED REFUSE PILE <br /> SLOPE HEIGHT SLOPE ANGLE FACTOR OF SAFETY <br /> (ft) (degrees) <br /> 150' 350 1 .47 <br /> 250' 300 1 .50- <br /> 300' 270 1 .56 <br /> The preceding slope geometries provide a factor of safety of approxi- <br /> mately 1 .5. <br /> 1 .4.4 Recommended Slope Configuration <br /> MESA regulations regarding non-impounding refuse piles state, in <br /> part "After Oct. 30, 1975, new refuse piles and additions to existing <br /> refuse piles. . . .shall not have any slope exceeding 2 horizontal to 1 ver- <br /> tical (approximately 27 degrees) except. . . .slopes exceeding 27' where engi- <br /> neering data substantiate that a minimum factor of safety of..1 .5 for the <br /> refuse pile will be attained." <br /> In general , the slope angle is dependent on the slope height; a <br /> steeper angle necessitates a lower slope height. <br /> For the purpose of locating and determining the size of various al- <br /> ternate locations for the proposed refuse pile, a 30° , 250' high and a <br /> 27°, 300' high slope have been used. <br /> 1-11 <br />