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1 <br />1 <br />' I:]TP.ODIICTIO[d <br /> <br />1 <br /> <br />GRA'~?? ?'T:S-. COAL GO;C'f.i'.1, <br />R-EFUSE AREA STABILITY A~~".CYSTS <br />~~cFiv~ <br />I~I I~~II~~~~II~~ I~~ <br />Doc Date:12H1/2001 <br />AUG 31 1981 <br />We have made this study to ana~.,~i~EO~Aility of the <br />IoW, o[ei. ~~oN:co <br />refuse disposal area located at the site oil ~l~i.~iesa <br />Coal Compan}~ coal mine which is located about ~~; miles north- <br />west of Cedaredge, Colorado near Celb}~ as shown in Fi€.ure 1 <br />of this report. - <br />' SCOPE <br />1 <br /> <br />t <br /> <br /> <br />t <br /> <br />1 <br /> <br />1 <br />1 <br />On May 28, 1990, Mr. Larry tt. Resc}~}.e of the Grand l"esa <br />Coal Company provided, for our use, five bull: samples of soils <br />taken from the refuse disposal area of the aforementioned <br />mine site. These bulk samples consisted of two un,•~eathered <br />refuse samples, tcao overburden soil samples, and one samale <br />of weathered refuse. .41so provided fcr our use at that time <br />was a blueprint of several cross-sections of the refuse c'.isresal <br />area and a copy of a map entitled Affected Land Tian c~hich is a <br />contoured air photo of the mine site area and refuse disposal <br />area s~~o~~ing the locations of the refuse disposal area cross- <br />sections. <br />To analyze the stability of the refuse disposal area, <br />several laboratory tests of the bul}: samples were made to <br />determine some of the index: and eneineerinp properties neces- <br />sar:~ for the stability calcultiens. The analysis calculations <br />were made using a computerized Bishop N:ethod of `'/ices based <br />o_n z re_`use disposal arez cros_'.-section ~~hich was the least <br />stable of the cross-sections provided for our use. <br />-1- <br /> <br />