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O <br />TECIMCAL MEMORANDUM <br />Page 11 <br />June 3, 1992 <br />SAC31583.AC.ZZ <br />Table 1 <br />Summary of Material Shear Strengths Properties and Unit Weights <br />for Stability Analyses <br />Friction Angle Cohesion Unit Weight <br />Material Fl(deg) I (psf) (pcf) <br />Refuse <br />Assumed ash properties <br />20 <br />0 <br />800 <br />500 <br />50 <br />120 <br />Smooth FML with clayb <br />8 <br />0 <br />120 <br />Textured FML with clay` <br />28 <br />800 <br />120 <br />Unsaturated conditions <br />9 <br />420 <br />120 <br />Saturated conditions <br />Compacted Clay Liner (under eastern ash <br />120 <br />disposal pit, for Section CS -B)° <br />0 <br />2,000 <br />Foundation Materials (simplified profile): <br />®Elevation 10 to 39 feet, dense silty <br />120 <br />sand and very stiff lean clay <br />33 <br />0 <br />*Elevation zero to 10 feet, very stiff <br />120 <br />lean clay <br />0 <br />2,300 <br />*Elevation zero to -30 feet, very dense <br />120 <br />silty/clayey sand <br />36 <br />0 <br />•Elevation -30 feet to -60 feet, very stiff <br />lean clay <br />0 <br />3,300 <br />125 <br />*Elevation -60 feet to -150 feet, very <br />125 <br />dense silty/clayey sand <br />0 <br />*Elevation -150 feet to -200 feet, very <br />125 <br />dense poorly graded sand <br />`w <br />0 <br />Note <br />'Refuse proper -tics from S. Singh, "Evaluation of the Strength and Stability of Sanitary Landfills", Santa Clara University, July 1989 <br />Nitchell, J.K., Seed, R.B.. and Seed, H.B., "Kettleman Hills Waste Landfill Slope Failure. 1: Liner System Properties," Journal of <br />Geotechnical Engineering, A.S.C.F , Vol. 116, No. 4, pp. 647-668,. <br />`CH2M HILL, Materials Report,'Kcller Canyon landfill, Contra Costa County, California, Table 11, Summary of Direct Shear Test <br />Results, p. 40, Prepared for Browning-Ferris industries, Houston, Texas. July 1991. <br />dInsitu-Toch. Evaluation o[ Stability of Ash Pit Excavation, STAB slope stability analysis by Marty Goodman, dated 9fW <br />Results of Static Stability Analyses <br />Static safety factors for the two sections analyzed are summarized in Table 2. Output plots <br />corresponding to static factors of safety summarized in Table 2 are included in Appendix III. <br />The ten "most critical" failure surfaces are indicated on each of these plots. PCSTABLSM <br />output files are also included in Appendix III. <br />