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07 <br />Page 19 of 2y <br />Written by: T. Boardman Date: 14 Sept 1999 Reviewed by: �A,�AkaciA Date: iO fAod Q <br />Client: Allied Waste Project: Forward Landfill Project/Proposal No.: WS0264 Task No.LQ2 <br />Calculations <br />The following values have been assumed in the analyses: <br />Y = 120 pcf <br />1w = 62.4 J2cfI <br />h= 2 ft <br />c = 0 to 100 psf <br />0 = 20 to 36 degrees <br />slopes of 3(H):l (V) <br />Calculation for slope angle <br />Horizontal Vertical tang Slope Angle ((3) z <br />rad Idegrees ft <br />3 1 0.333 0.32181 18.435 2.108 <br />Static Conditions (1ft cover soil, 3H:1V slope): <br />Case A: No seepage (long-term condition) <br />Equation (4) is used to calculate FS: <br />c (psf) <br />Factor of Safety <br />23 28 <br />30 <br />32 <br />34 <br />0 <br />1.273 <br />1.595 <br />1.732 <br />1.875 <br />2.024 <br />10 <br />1.405 <br />1.727 <br />1.864 <br />2.006 <br />2.155 <br />25 <br />1.603 <br />1 <br />2.061 <br />2.204 <br />2.353 <br />100 <br />2.591 <br />2.913 <br />3.050 <br />3.1921 <br />3.341 <br />Case B: Seepage (water at the surface) (short-term condition) <br />This calculation assumes water at the surface of the soil layer. The expected maximum depth of water above <br />the interface is to be determined on the basis of HELP model analyses and modifications made to these <br />calculations, if necessary <br />Equation (5) is used to calculate FS: <br />c (psf) <br />Factor f Safety <br />20 24 <br />28 <br />34 <br />36 <br />0 <br />0.524 <br />0. 4 <br />0.766 <br />0.971 <br />1.046 <br />10 <br />0.656 <br />0. <br />0.897 <br />1.103 <br />1.178 <br />25 <br />0.854 <br />0. <br />1.095 <br />1.301 <br />1.376 <br />100 <br />1.842 <br />.959 <br />2.083 <br />2.289 <br />2.364 <br />} <br />