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Odober7001 Scnem Coa! Company `Seneca l1 W b9me Sedlmrnlalion Pond 014 Smbr/ity Ana/ytit ~ 2 <br />• ~ The parameters described above were input into [he SLOPE/W program to evaluate static stability of the <br />Pond 014 structure and are shown in [he attached program printouts with associated results. <br />2.0 RESULTS <br />Using the described inputs, the stability analysis indicates a static FOS of 1.53 for a downstream <br />slope, which meets the required FOS under applicable provisions of Rule 4.05.6(1])(k). The <br />SLOPE/~S/ computer printouts, located in Appendix B, document all inputs and stability analysis <br />results. This stability analysis result is based on the assumption that construction practice employed <br />for this embankment resulted in embankment material compaction of at least 95% Standard Proctot. <br />3.0 REFERENCES <br />Leidich, Tom (2000). Sedimentation Pond 014 Stability Analysis. Exhibit 13-/2.2, Yoas1 Permit. <br />Prepared for Seneca Coal Company. <br />Northwest Colorado Consultants (August, 1996). "Geotechnical Investigntiort/Summary Report Pond 0/0 <br />Embankment -Permit C-94-082 Yoast Mine, Route County, Colorado". Prepared for Seneca Coal <br />Company. <br />• <br />• <br />Momtgomery IY~alron Har{a. 16S South Unran Bou/tuard Suite 410 " lokemood, Colorado 80?78 " (303J 763-5140 <br />J:\7J70108SersaaCm/~PondrArb/r\Word~POND7l ArbrntrSTABILIIY.do. <br />!0/17/07 mb <br />