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<br />1 <br />6 <br />Case II Q = 30° <br />c = 350 psf <br />' In both cases tVie failure surface is shallow with Case II <br />yielding a failure surface close to the location of the tension <br />trucks observed :i.n the field. <br />' We conservatively estimate that the relative density of <br />tl~e end dumped spoil is at least 30 percent. Spoil placed in <br />' 4-foot lifts would have a relative density probably not <br />exceeding 70 percent. TViis increase in relative density would <br />' probably increase tY~e friction angle by about 4° to 6°. In our <br />analysis we assume an increase of 6° to 44°. <br />' We performed stability analyses of the final design dump <br />configuration as shown on Figure 1 for several sets of strength <br />' parameters and water conditions. The strength parameter cases <br />included: <br />Case A: Soil 1 (new spoil placed in 4 ft. lifts) <br />' ~ = 44°, c = 0 <br />Soil 2 (existing spoil, Case I) Q = 38° c = 0 <br />' Soil 3 (alluvium/colluvium) ~ = 26° c = 0 <br /> Case B: Soil 1 (new spoil end dumped and dozer graded) <br /> ~ = 38° , c=0 <br /> Soil 2 (Case I) Q = 38° c = 0 <br />' Soil 3 Q = 20° c = 0 <br />' Case C: Soil 1 (new spoil end dumped and dozer graded) <br /> ~ = 30° c = 350 psf <br />' Soil 2 (Case II) ~ = 30° c = 350 psf <br />° <br /> Soil 3 Q = 26 <br />c = 0 <br />1 <br />' Golder Associates <br />