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additional slope failures to occnt•. 1t is LeLiP~ecl ..hat tl,e <br />• majority of slope failures occurred in the tower cla}, shale ,nut <br />mudstone layers of the Lower Rowie member, immediately aLo~e the <br />Rollins sandstone :cod at, and immediately below the "f~" cual sr.am <br />tentatively identified at e.ievation 6•L00. <br />It. is believed that during the nornucl <br />valle}- forming processes, the majority of the slope failure <br />materials had heen removed by erosion and have heen par•tiall> <br />replaced by newer slope failures, presently occurring at aucl <br />above the "D" coal seam. In addition, the soils within the <br />l,roposed coal mine waste hank area are a combination of gory <br />eroded old and new slope failure masses, collrtvial soils, t•ocl: <br />fall materials and ancient alluvial "river" gravels and cobbles <br />deposited by the North Fork of the Gunnison River c.hen it t:as at <br />• higher, relative elevations. <br />SITE AVAILABLE CONSTRUCTION SOILS <br />The soils and weathered materials of the <br />Bowie and Rollins sandstone members are not well different.iat.e,i <br />on Lhis site. A significant number of exploration pits and <br />possible exploration borings would be required to acromplisl~ <br />meaningYttl mapping of this site. Based upon Lincoln DeVore <br />surface reconnaissance of this site, the weathered shales, silt- <br />stone and mudstones of the Bowie Formation appear to be quite <br />close to the grouted surface in the lower reaches of the unnamed <br />dry creek, principally on the west bank. The east hanl: of this <br /> <br /> <br />