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escarvation in the toe area of the coal mine waste Lank. [t. is <br />• possible the Cow of the coal mine waste bank may re~tuire redesign <br />to provide a keyway, rocl: wall buttress, mechanicall} stat~ilize,d <br />earth section or a combination of these methods to provid,r t.roper <br />stability in this critical area. <br />if the top of the kollins Formation iti <br />between 6080' and 6090', as indicated by our surface reconnais- <br />sance of this site, the slope stability calculations prepared I..• <br />WESTEC mould be based upon an improper cross section and <br />soil/rock profile. It is believed ttre majority of calculations <br />preformed by WESTEC would be on the very conservative side, as <br />the placement of the low strength Bowie Member of tire Plesa Verde <br />Formation would be less extensive beneath the base area of t.lre <br />coal Mine Waste Bank but, the stability of the toe area ma}~ be in <br />• question. <br />It is believed that significant amounts <br />of top soil can be obtained from this site. It is also believed <br />that significant amounts of construction materials, principally <br />the alluvial gravels and cobbles, can he recovered prior to <br />placement of the coal mine waste. It is possible ttrat the vol- <br />umes of the eastern portions of this waste pile may be somewhat <br />increased due to mining of usable gravels and cobbles. It is <br />recommended that significant attention be given to the access <br />roads and final road construction at the east end of the waste <br />pile. It is believed that fill slope angles may be increased, <br />with proper use of mechanically stabilized earth techniques and <br />other slope retention measures. Such slope retention measnr~~s <br /> <br />7 <br />