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115 <br />Page !/4' of 22 <br />Written by: T. Boardman Date: 14 Sept 1999 Reviewed by: M I tl t Ni 4k Date:tb LIE) V "A <br />Client: Allied Waste Project: Forward Landfill Project/ Proposal No.: WS0264 Task No.LM <br />Calculations <br />The following values have been assumed in the analyses: <br />Y= 120 pcf <br />-1. = 62.4 <br />h = 1 ft <br />►ice, t�-i�-/ t� l <br />C= 0 to 100 psf <br />= 20 to 36 degrees <br />slopes of 2(H):l (V) <br />Calculation for slope angle <br />Horizontal Vertical tang Slope Angle z <br />rad Idegrees ft <br />2 1 0.5 0.46361 26.565 1.118 <br />Static Conditions (1ft cover soil, 2H: IV 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 27 <br />30 <br />32 <br />34 <br />0 <br />0.849 1.019 <br />1.155 <br />1.250 <br />0.489 <br />10 <br />1.035 1. <br />1.341 <br />1.436 <br />1.535 <br />E25 <br />1.315 .485 <br />1.621 <br />1.716 <br />15 <br />1 <br />2.712 2 <br />3.0181 <br />3.1131 <br />3.212 <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 deter ined on the basis of HELP model analyses and modifications made to these <br />calculations, if necessary <br />Equation (5) is used to calcul a FS: <br />c (psf) <br />Factor of <br />20 <br />ety <br />24 <br />27 <br />34 <br />36 <br />0 <br />0.349 <br />7 <br />0.489 <br />0.648 <br />0.697 <br />10 <br />0.53 <br />0.6 4 <br />0.675 <br />0.834 <br />0.884 <br />25 <br />0.816 <br />0.89 <br />0.955 <br />1.113 <br />1.163 <br />100 <br />--271-3 <br />2.291 <br />2.3531 <br />2.5111 <br />2.561 <br />A/�4 W/ -eq <br />11 <br />