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VIEOSYNTEC CONSULTANTS Page Aof IT <br />- <br />Written Reviewed b �v ° `"� ACA Date: <br />Written by: T Boardman Date: 14 Sett y <br />Client:_ ajUe Wase Project: F^* �x�ar� t,anc3fi11 Project/Proposal No.: WS0264 Task No.; -U <br />Calculations <br />The following values have been assumed in the analyses: <br />Y = 120 pcf <br />= 62.4f <br />h =1 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 />MHodzontalVertical tan�3 Slope Angle () z <br />rad degrees ft 1 0.333 0.3218 18.4351 1.05411 <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 />Factor of Satety <br />Factor of Safety <br />20 24 <br />27 <br />34 <br />36' <br />0 <br />0.524 0.641 <br />23( <br />2 <br />30 <br />32 <br />0 1.273 <br />1.529 <br />1.732 <br />1.875 2 <br />10 1.537 <br />25 1.93 <br />1.792 <br />2.187 <br />1.996 <br />2.391 <br />2.138 2 <br />2.533 <br />nn i 6na <br />d 1 <br />.367 <br />4.510 4 <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 of Safety <br />20 24 <br />27 <br />34 <br />36' <br />0 <br />0.524 0.641 <br />0.734 <br />0.971 <br />1.046 <br />10 <br />0.788 0.905 <br />0. 7 <br />1.235 <br />1.310 <br />25 <br />1.183 1.300 <br />1.393 <br />1.630 <br />1.705 <br />100 <br />3.159 3.276 <br />9 <br />3.607 <br />3.681 <br />C <br />El <br />C <br />