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March 2004 $entea Caa! CamPany * Seneca 77 W Mine Sedimentation Pond 016A At-built Stability Analytic ~ 2 <br />• <br />- ,.; TABt~.7{ <br />INDEX:ANU-STRENGT#1;P.',ROPERTIES OF SOILS EUR.PONDS, .. <br />~ <br />SAMPLE ATTERSERG PARTICLE SIZE EFFECTIVE EFFECTIVE <br /> LIMITS DATA FRICTION ANGLE, COHESION, <br /> ILL - PI) ~ (% passing No. ~' c' (psf) <br /> 200) <br />Pond 016 Foundation 49 - 20 96 29.9 0 <br />Pond 16A 37 - Z9 86 - - <br />Embankment Fill <br /> 38 - 22 86 27.5 338 <br />Pond 070 Embankment <br />Fill <br />2.0 RESULTS <br />Using the described inputs, the stability analysis indicates a static FOS of 1.7 for a downstream slope, <br />which meets the required FOS under applicable provisions of Rules 4.05.9 (6) and 4.05.9 (8) (b). The <br />SLOPE/W 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 Proctor. <br />3.0 REFERENCES <br />• Northwest Colorado Consultants (July, 1994). "Geotechnical Investigation, Haulroads Y-A & Y-B and <br />Sedimentation Pond 010, Seneca // W Mine Area, Routr County, Colorado". Prepared for Seneca <br />Coal Company. <br />Northwest Colorado Consultants (August, 1996). "Geotechnical Investigation/Summary Report Pond OIO <br />Embankment - Permit C-94-082 Seneca H_W Mine, Roun County, Colorado". Prepared for Seneca <br />Coal Company. <br />• MWH, 7801 CaGjornia .Street Suite 2900 * Denver, Colorado 80202 * I303J 291-2222 <br />J:\2470108 Seneso Coo/~PondrAtb/t\Ward~POND 16A ASbuilt SfABILJTY.dar <br />03/02/00 dfm <br />