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ECOSA-RECLAIMED-STATIC <br /> • SYMBOL WIIER UMT WEIGHT fRN:INM1 <br /> Bdt+..i ANGLE rf <br /> U_ <br /> --------____..._.._ <br /> ECOSA cao— <br /> rm <br /> EastC W. _ 1...__J wae.es a. ,•b wde+etb <br /> ( ) <br /> U]N <br /> lw� <br /> ,>,tr NM 1.]r ,am n?er r1r r'JN n.w raN nAm <br /> IMS%—(ft) <br /> ECOSA-RECLAIMED-PSEUDO-STATIC <br /> SYMBOL I MATERrt UNT W9GHT fRCM( <br /> MW ) ANGLE 9 <br /> OrrburOw ,is 99 <br /> ECOSA ca4nx.n In n <br /> rsae _ <br /> Ea Crosson AYtB WWNBrrcY&rcY 1I5 U.d—" <br /> (bodditM <br /> msr Ww.�sos ros-Lw <br /> m+. <br /> mnJr N.rI 4]M nr0 n.1O r.ro rar I,.MI Il3r Nme <br /> dstonce tfO <br /> Figure S. Slope stability analyses, Permit M-1980-244. <br /> Consistent seepage could saturate the native foundation, at least local to the leak in the pipeline, and the <br /> drainage path between the leak and the seepage point at the toe of the waste dump. Pore pressure affects <br /> shear strength,so saturated conditions in the foundation could affect the FoS in the seepage area. In order to <br /> evaluate this effect, additional slope stability analyses were completed, using the same stability models that <br /> were used in the permitting analyses (Figure 5), but with modifications to allow for saturated conditions in the <br /> foundation colluvium. A groundwater surface was also defined in the volcanic bedrock. However,with the <br /> groundwater occurrence in the volcanic bedrock affected on a large scale by drainage through underground <br /> workings,and flow in Grass Valley,the bedrock groundwater surface was defined below the colluvium. Results <br /> of these analyses are illustrated in Figures 6 and 7 for static and pseudostatic conditions, respectively, and <br /> summarized in Table 1. FoS values for these analyses do show an effect of saturation in the colluvium, but the <br /> values are still satisfy acceptance criteria for the waste dump. <br /> Table 1. Slope stability analysis results. <br /> Loading Condition Minimum FoS Comment <br /> Static 1.54 <br /> Pseudostatic 1.14 Pseudostatic coefficient 0.14 <br />