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Apd77000 Senear Coal C°mparry * Seemm 11 Whine Sedimentation Pond O76 StaLik'PyAnalyrir ~ 2 <br />• The parameters described above were input into the SLOPE/W program to evaluate static stability of the <br />Pond Olb structure and are shown in the attached program printouts with associated results. <br />2.0 RESULTS <br />Using the desmbed inputs, the stability analysis indicates a static FOS of 1.5 for a downstream slope, <br />which meets the required FOS under applicable provisions of Rule 4.05.6(11)(k). The SLOPE/W <br />computer printouts, located in Appendix B, document all inputs and stability analysis results. This <br />stability analysis result is based on the assumption that construction practice employed for this <br />embankment resulted in embankment material compaction of at least 95% Standard Proctor. <br />3.0 REFERENCES <br />Leidich, Tom (2000). As-Built Pond Olb. Exhibit 13-9A, Seneca 11 W Permit. Prepared for Seneca Coal <br />Company. <br />Lou L. and Peng S.S. (June 1999). Integrated Approach for Predicting Mining Subsidence in Hilly <br />Terrain. Mining Engineering. p. 101. <br />Northwest Colorado Consultants (July, 1994). "Geotechnical Investigation, Haulroads Y-A & Y-B and <br />Sedimentation Pond 0/0, Seneca ll W Mine Area, Routt County, Colorado". Prepared fat Seneca <br />Coal Company. <br />Northwest Colorado Consultants (August, 1996). "Geotechnical Investigatian/Summary Report Pond 010 <br />Embankment -Permit C-94-082 Seneca II W Mine, Routt County, Colorado". Prepared for Seneca <br />• Coal Company. <br />• <br />Mamt~omery Walton Amesirar, Ine. 765 South Union Boulevard, Suite 410 * Lakewood, Colorado 80728 ' (303) 763-5140 <br />/A2470108 Senav Coa!\Tr-35\POND 16 Aiburl~ STAB(I-ITY.da <br />11 /28/00 mb <br />