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CESARE, INC. <br />A summary of the material properties used in our analysis is shown in Table 3. <br />TABLE 3. Material Properties Used <br />Material <br />Cla <br />N draulic Conductivit <br />r <br />Unit <br />Weight <br />(p;n <br />Cohesion <br />G <br />friction <br />Angle <br />m <br />reel <br />26 <br />cm sec <br />ft sec <br />#t ds <br />lK <br />1.00E -07 <br />_3.28E_ -09 <br />2.83E -04 <br />0.1 <br />125 <br />100 <br />Sand <br />1.00E -06 <br />3.28E -08 <br />2.83E -03 <br />0.1 <br />125 <br />0 <br />30 <br />Gravel <br />1.00E -02 <br />3.28E -04 <br />28.35 <br />0.1 <br />135 <br />0 <br />35 <br />Weathered <br />Shale <br />9.53E -05 <br />3.13E -06 <br />2.70E -01 <br />0.1 <br />130 <br />50 <br />27 <br />Shale <br />1,00E -08 <br />3.28E -10 <br />2.83E -05 <br />0.01 <br />_ <br />130 <br />_ <br />500 <br />—j <br />25 <br />Slurry Wall 1st <br />1,00E -06 <br />3.28E -08 <br />2.83E -03 <br />1 <br />115 <br />0 <br />30 <br />Slurry Wall <br />1.00E -07 , <br />3.28E -09 <br />2.83E -04 <br />1 <br />115 <br />0 <br />30 <br />ANALYSIS RESULTS <br />We performed seepage and slope stability analyses using SEEP/W and SLOPE /W software <br />published by Geo -Slope International and contained in the Geostudio 2007 suite of applications <br />(Version 7.20, Build 5033). <br />STEADY STATE SEEPAGE ANALYSIS <br />For the steady state seepage analysis of the reservoir when empty, we analyzed the cross section <br />we created at Station 31 +52 (the thickest gravel layer encountered). We first evaluated a slurry <br />wall with a hydraulic conductivity 1x10 cm /sec. The Seep /W analysis provided the total flux (i.e., <br />flow) in a one -foot length of wall of 5.5804 ft3 /day. The Seep /W analysis results for the slurry wall <br />with a hydraulic conductivity of 1x10 cm /sec are shown in Figure 1. We multiplied the flux by the <br />total wall length (around the perimeter) to obtain an estimate of the total flow through the wall. <br />The total wall length was taken as the average of the perimeter of the pit at the top of the 3:1 <br />slope and the perimeter of the base of the reservoir (4460 feet). For this case, we estimated total <br />inflow through the bottom and the perimeter of 24,888 ft3 /day. The State Engineer's total <br />maximum allowable inflow (bottom and perimeter) is 28,767 ft'/day. Based on the material <br />properties used, for the section analyzed with the thickest gravel layer, the factor of safety is about <br />1.2 — between the actual calculated inflow and the total maximum allowable inflow. <br />11 124 GP Ranches Memo 03.21.1343.21.13 <br />3 <br />