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~~' <br />SMITH WILLIAMS CONSULTANTS, INC. <br />indicate the foundation of the VLF will primarily be constructed in bedrock. This is consistent <br />with what was used in Amendment No. 8 to represent the shear strength of the foundation. <br />PSSA Embankment Fill. The PSSA embankment will be constructed using structural fill and <br />-other suitable coarse fill. For the stability analyses, the PSSA embankment fill shear strength <br />was modeled with an angle of internal friction of 38 degrees and no cohesion. <br />Piezometric Data. The piezometric head was modeled as 1 foot above and parallel to the <br />lined surface, which is consistent with the conditions used in Amendment Nos. 6, 7, and 8 <br />(CC&V 1993, 1998, and 2000). <br />5.1.3 Stability Results <br />The maximum side slope of 1..-6H:1 V was calculated as part of an infinite slope analysis, which <br />represents the steepest side slope that will still provide apseudo-static FOS of 1.0 or greater for <br />surface raveling of ore material. during a 0.14g seismic event. Calculations are presented in <br />Appendix E. Based on this analysis, a side slope of 1.6H:1 V was selected as the maximum ore <br />side slope for the VLF that would provide an FOS of 1.0 or greater. <br />• Stability analyses were performed on the configuration of the ore shown on Drawing A200 and <br />with the piezometric surface conditions presented above. A total of eight critical stability <br />sections were selected for the stability analyses, which included the Phase I through IV VLF and <br />Phase 5 VLF. The locations of the stability analyses are shown on Drawings A700 through - <br />A720. <br />Stability analysis results for each of the critical stability sections are summarized in Table 4. The <br />output from the stability analyses are presented in Appendix E. <br />As presented in Table 4, the stability sections indicate that the static FOS .values are 1.5 or <br />greater, and pseudo-static FOS values are 1.0 or greater for design acceleration of 0.14g. It is <br />important to note that the FOS values reported represent the operational ore side slopes of <br />between 1.6H:1 V and 2.SH:1 V. At reclamation, the ore side slopes will be regraded to 2.SH:1 V, <br />which will increase the overall long-term stability of the facility. <br />• <br />S:\PROJECTS\1125 CCBV PHASE 5 VLFlH2 - DESIGNWREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 34 <br />