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the native slopes should he disturbed xs 1iCtle as possible. <br />• ve <br />ive cuts <br />12 feet <br />Exc or fill <br />v 20 f <br />t <br />h <br />ld b <br /> ess <br />o <br />r s o <br />er ee <br />, s <br />ou <br />e <br /> avoided whenever possible hut. , can he constru cted. These s[abiltp <br /> calculations assumed maximum vertical cut of 10 feet and ma~:imum <br /> fill of 20 feet, on the upper native slopes. It is realised that <br />thicker fills may be placed on the lower end of [he Haul Road, <br />resting itt the West Yard Area. <br />CUT ANf} FILL GEOMETRY <br />Based upon our analysis, it. is recom- <br />mended that cuts in the colluvium be limited to approximately LO <br />to 12 feet in height, with a maximum slope of 1.5:1 IH:V1. Fills <br />consisting of Clayey colluvium GC (Soil Type 21 placed on the <br />colluvium should be limited to 40 feet high, measured from the <br />fill crest to the toe, with a maximum slope of 1.5:1. Mechani- <br />call}• reinforced fill slopes composed of Clayey colluvium GC <br />(Soil Type 21, possibl}• buttressed with boulders, should be <br />limited to 25 feet of height, measured from the fill crest to the <br />toe and placed at a slope of 1:1. The exposed fill surface, ma}• <br />be covered with cobble and boulder fragments, to prevent exces- <br />sive raveling and erosion of the slope surface and to assist in <br />revegetation. The height. limitation for the mechanically rein- <br />forced slope may be waived if subsequent study and field observa- <br />tions indicate the toe areas will not be overloaded by tkte man- <br />made fill. <br />The Slope Stability calculations print <br />• out provided with this report assumed a steep fill slope l l:l I <br />8 <br />