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• 1 ~ ROCKY MOUNTAIN GEOTECHNICAL <br />4G'~~2.ing Hd'TCn\ na[h Edith <br />t•~~ ~• 2 F, l ~ a ~, <br />_,n -,, <br />Mr. 1.7illiam Tate <br />taestern Associated Coal <br />410 17th Street <br />Denver, CO 80102 <br />~~~~~ <br />Stability Ahal~ycis,.~~.ne;:,~...<~ <br />Blue Ribbon` Fti;~e`.._ -. <br />P.ccess Read <br />Dear ":z. Tate; <br />n::' <br />At the request of Ptr. Marv P.dam, an analysis wss pErrerm=d b_ <br />F.ecky Fountain Geotechnical *_o evaluate the stability of t:~_ mine <br />access road at [9este_n Associated Coal's Blue Bibb o;. '•Iine, located <br />near ?aonia, Colorado. <br />• CONDITIONS MODELED <br />The analysis ~-as performed utilising a typical cross-section of <br />the access road provided by western Associates Coa'. the <br />variable subsurface conditions expected along the access road <br />were model~•d by va-ying the thickness of the overl~~~nocolluvial <br />soil and location of the piezometric surface. These ca..^.ditions <br />are presented Graphically on the enclosed figure. <br />The conditions vary from a complete rock excavation to an <br />e::cavatior. entirely founded in colluvial soils. <br />Strengt`: properties of the overlying colluvial soils and the <br />becrock were cbtai.^.ed from aectEC'~nical investigations pe:for-red <br />by Rocky Mountain Geotechnical in 1981, in the vicinity of the <br />Blue P,itbon MinE access roan. The following speci`_ic values for <br />shear strength, obtained from the previous investic_atior, were <br />utilized i.. the vari~,us phases of the analysis. <br />colluvial Scil (measures shear strencth paramet_rs) <br />°.esidual st_*enatY: <br />r_y <br />T~ N <br />• C ~ G k = l <br />k <br />_ .7114 f <br />Y" <br />= 16' <br />rt:~gth <br />= 446 p~f <br />= 10~ <br />Tne P~a llroad S[a ^c r, • 555 ~. F,~es Peak Avenue. 6wce 107• Colorado Springs. Colorado 80903 • (3031 634 1999 <br />