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rllvnl~ 2IX)0 Sentry Cov/ Compnrry ' 1 ovr! Minc SerLmm(oti°n Pand OI S SlabrGly Anah.rrr • Pvgc The Pond 1G foundation strength results were selected to represent the strength properties of the • Pond 12 Foundation sods due to the similarity in index properties. The sample of the Pond 16 foundation soil was collected by excavating a test pit and sampling with a Shelby mbe. An effective stress friction angle of 29.9 degrees with no cohesion was used m the stability analysis for the foundation soils of Pond 12. The Pond l0 embankment strength results were selected t0 represent the strength properties of the Pond 12 embankment fill due to the snttilarity in index properties between the three samples from the Pond 12 embankment and borrow azea and the Pond 10 embankment. Th.. Pond 10 embankment shear strength test was performed on a remolded sample at 95% of the maxunum dry density from the standazd Proctor test (ASTM DG98). An effective stress friction angle of 27.5 degrees with a cohesion of 338 psf was used 1n the stability anal}sis for the Pond 12 embartkment soils. The consolidated undrained triaxial sheaz strength and index classification lab results Cor the soils tesred at Pond 10, Pond 12, and Pond 1G aze included in Appendii A. TABLE 1 INDEX AND STRENGTH PROPERTIES OF SOILS FOR PONDS SAMPLE ATTERBERG LIMITS (LL - PI) PARTICLE SIZE DATA (% passing No. 200) EFFECTIVE FRICTION ANGLE, ~ EFFECTIVE COHESION, c' (psq Pond 12 GI South End 46-25 92 - - POnd 12 G2 North End 34-IG 59 - - Pond 12 G3 Borow 33-18 81 - - POnd 12 G4 Borrow 35-15 82 - - Pond 121n-plate 50-34 86 - - Pond 16 Foundation 49 - 29 96 29.9 0 Pond 10 Embankment 38 - 22 86 27.5 338 The soil parameters were input into the SLOPE/\C/ program to evaluate the static stability of the Pond 012 structure. The results are shown in the program printout located in Appendix B. 2.0 RESULTS Usmg the described inputs, the stability analysis indicates a static FOS of 1.733 which meets the required FOS under applicable provisions of Rule 4.OS.G(11)(k). 1"he SLOPE/\Cr computer printouts, located in Appendtx B, document all inputs and stability analysis results. 3.0 REFERENCES Leidich, Tom (2000). Pond 012 As-Built. Exhrbi! 13-6, Seneca IIIY/[ Pernirt Prepared Eor Seneca Coal Company. Leidrrh, 7~um (19%!>J. Sedlmm~lnkon Pmid 012 S[abilrty Arurlyrit. Prepazed for Seneca Coal Company. "SLOPE/W Users Manual", Geoslope International, Ltd. (1995) Calgary, Canada. • C~ rl1onnSmm~~ Il~iilmn.-Imen.nr, Inc 165 .Sunih Urnan Rwda~urd, Ante J1p' I~,kervood. Colanr~ln 807?6' (i03J ~L3-S I10 war.. ~ ~rxvEV p,„enum~•.n, nmm~r,,,+ruan r. >newn „ ne..,~ .r,.