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Pore Water Pressure = . 00 (psf) <br /> Shear Stress = 849 .45 (psf) <br /> Total Length of failure surface = 466 . 13 feet <br /> ------------- ------------------------- - -------- --- ------ <br /> For the single specified surface and the assumed angle <br /> of the interslice forces, the SPENCER' S (1973) <br /> procedure gives a <br /> FACTOR OF SAFETY = 1 . 898 <br /> Total shear strength available <br /> along specified failure surface = 751 . 52E+03 lb <br />