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SI,OPE GEUMETRY <br /> The fill itself w:Lll involve appr_oxi- <br /> :nately 400, 000 cubic yards of materials, %•:hick Grill be placed <br /> on an area of slightly over. 10 acres. Preli_Y.znary cross-sections <br /> for the fill 'nave been drawn by Mid-Continent Resources . The <br /> maximum fill heigl-tshown on these cross-sections was roughly <br /> 60 feet. This value wa:3 selected for purposes of analysis, <br /> since the highest- slope can be expected to have the least factor <br /> of safety. <br /> It is our understanding that the fill- <br /> will classify as a Valley Fill under regulation of the Office of <br /> Surface .dining (OSM) . However, it is also our understanding that <br /> the underdrain and filter layer require:-aents of this classification <br /> will be waived, due to the relatively good dra:_:-+ase conditions <br /> which will exist in the fill area. Therefore, the effects of the <br /> underd~bin and Filter ac,:e no considered in our stability a,Za?.y- <br /> sis . <br /> The OSM regulations specify a r:aximam <br /> slope angle of 2--horizontal to 1 -vertic�)!- for fill. slopes . The <br /> regulations also stale that a slope steeper_ than 2.8-horizontal <br /> to 1-vertical �e ?:eyed into rock at the toe, or be provided with <br /> a rock toe ;buttress. It is o.ir unders`ca;»ing, however, that slopes <br /> steeper. than 2.8 : 1, but no steeper than 2 : 1 may b.e permitted with- <br /> out the toe buttressing, providing the slope safety factor is <br /> sufficiently high. Out stability analysis was performed for face <br /> slopes of 2.8: 1, 2. 5 : 1, and 2 :1, in order to provide a range of <br /> stability val•aes. <br /> The preliminary slope sections provi3e,3 <br /> to Lincoln-DeVor.e show<-.d two terraces, or benches, on the face <br /> of the GO foot high s1op.�. These terraces we. e located roughly <br /> -4- <br />