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E <br />9414C <br />SMITH WILLIAMS CONSULTANTS, INC. <br />Project: Phase 5 VLF Job No. 1125 <br />Calculation Title: Arequa Phase 5 VLF Stability Calculations <br />Prepared B : Justin Hall Date: 3119/08 <br />Checked B : John Lupo Date: 3119108 <br />Normal Pressure s Shear Pressure s <br />144 206 <br />720 868 <br />1,440 1,618 <br />7,200 6,873 <br />14,400 12,813 <br />28,800 23,871 <br />43,200 34,338 <br />72,000 54,256 <br />144,000 100,801 <br />Phreatic Surface <br />The depth of solution above the geomembrane liner for all conditions modeled, except sections <br />19 through the PSSA, was one foot. Cross section E intersects the proposed Phase 5 PSSA and was <br />modeled with a phreatic level at an elevation of 9,765 feet. Cross Section G intersects the existing <br />VLF PSSA and was modeled with a phreatic level at an elevation of 9,300 feet. These elevations <br />are considered conservative because they represent the maximum solution containment within the <br />VLF. <br />CALCULATIONS: <br />The stability analyses considered: <br />e Arcuate failure surfaces through the ore and foundation. <br />e Wedge failure surfaces through the ore, geomembrane/soil liner interface, and foundation. <br />For circular failure surfaces, SLIDE employs a searching routine which iterates along a spatial grid <br />to determine the minimum FOS for the given conditions. <br />For wedge failure surfaces, search blocks/lines/points are used to define a zone of weakness such as <br />the geomembrane/soil liner interface, where failure is likely to occur. Slide conducts a searching <br />routing, limited by block/line/point boundaries. <br />0 RESULTS: <br />The results from the stability analyses are attached to this calculation sheet and indicate the