Laserfiche WebLink
March 2004 Seneca Coal Company * Seneca 11 W Mine Sedimentation Pond 076A Ar-built Stability Analytic ~ 2 <br />• <br />C TABLE 1 <br />INDEX AND STRENGTH PROPERTIES OF SOILS FOR PONDS <br />SAMPLE ATTERBERG PARTICLE SIZE EFFECTIVE EFFECTIVE <br /> LIMITS DATA FRICTION ANGLE, COHESION, <br /> ILL - PI) (% passing No. ~' c' Ipsfl <br /> 2001 <br />Pond 016 Foundation 49 - 20 96 29.9 0 <br />Pond 16A 37 - 19 86 - - <br />Embankment Fill <br /> 38 - 22 86 27.5 338 <br />Pond 010 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 />fot this embankment resulted in embankment material compaction of at least 95% Standazd Proctor. <br />3.0 <br />• Northwest Colorado Consultants (Iuly, 1994). "Geotechnical Investigation, Haulroads Y-A & Y-B and <br />Sedimentation Pond 010, Seneca I! W Mine Area, Roun County, Colorado". Prepared for Seneca <br />Coal Company. <br />Northwest Colorado Consultants (August, 1996). "Geotechnical /nvestigation/Summary Report Pond 010 <br />Embankment -Permit C-94-082 Seneca II W Mine, Roun County, Colorado". Prepared for Seneca <br />Coal Company. <br />• _ <br />MWN, 7801 Cafrfamia .Street, Suite 2900 * Deucer, Colorado 80702 * (303) 791-2772 <br />J:\24701085enaaCoa/~PondrAtb/t\Word~POND 1GA ASbuiltSTAB7IJTY.doe <br />03/01/04 djm <br />