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TECHNICAL 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 <br />Cohesion <br />Unit Weight <br />Material <br />(deg) <br />(psf) <br />(pcf) <br />Refuse <br />.20 <br />800 <br />50 <br />Assumed ash properties <br />0 <br />500 <br />120 <br />Smooth FML with clay' <br />8 <br />0 <br />120 <br />Textured FML with clay` <br />Unsaturated conditions <br />28 <br />800 <br />120 <br />Saturated conditions <br />9 <br />420 <br />120 <br />Compacted Clay Liner (under eastern ash <br />disposal pit, for Section CS -B)° <br />0 <br />2,000 <br />120 <br />Foundation Materials (simplified profile): <br />®Elevation 10 to 39 feet, dense silty <br />sand and very stiff lean clay <br />33 <br />0 <br />120 <br />*Elevation zero to 10 feet, very stiff <br />lean clay <br />0 <br />2,300 <br />120 <br />*Elevation zero to -30 feet, very dense <br />silty/clayey sand <br />36 <br />0 <br />120 <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 />- <br />dense silty/clayey sand <br />36 <br />0 <br />125 <br />•Elevation -150 feet to -200 feet, very <br />dense poorly graded sand <br />40 <br />0 <br />175 <br />Notes: <br />'Refuse properties from S. Singh, "Evaluation of the Strength and Stability of Sanitary Landfills", Santa Clara -University, July 1989 <br />I'Mitchell, J.K., Seed, R.B., and Seed, H.B. "Kettlernan Hills Waste Landfill Slope Failure. 1: Liner System Properties," Journal of <br />Geotechnical Engineering, AS.C.F , Vol. 116, No. 4„pp. 647-668,. <br />`CH2M HILI., Materials Report,'Keller Canyon landfill, Contra Costa County, California, Table 11, Summary of Dired'ShearTest <br />Results, p. 40, Prepared for Browning-Ferris Industries, Houston, Texas. July 1991. <br />°lnsitu-Tech. Evaluation of Stability of Ash Pit Excavatim 'S'f ASL stope stability analysis by Marty Goodman, dated 9(3/87 <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 />