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. ~_ <br />,, <br />~ li>~ - ROCKY MOUNTAIN GEOTECHNICAL~ INC. <br />Achieving Harmony with E~ai th <br /> <br />iii iiiiiiiiiiiiiiii <br />[lined Land Reclamation Ui~.~ision <br />1313 Sherman Street <br />Denver, CO 80203 <br />RECEIVED <br />Attn: Fobert Liddle <br />Reclamation Specialist _ 1 ~„$3 <br />r)~"C 1 0 <br />Re: Blue Ribbon Coal Company <br />Permanent Proo ram Pe Cmll ~ .F(LAMATION <br />Stipulation )k 1 _, ~•: ,,.. ~ ur NATURAL RESOUQCES <br />Dear Dtr. Liddle: <br />1 <br />1 <br />Thi.~ letter and the accora},an i.ng mate and profit^~ represent thr_ <br />detailed mappi.rrg~~oo£ :rtability~r_onditions along the e::isting <br />access road at the~itlu•~ Ribt,on t1Lne. c or pur[~o,es oL thic report <br />a stationing system leas-t:cen util-i'ze!I which is identical to ?.}gat <br />Used In °1 ]armed Prof 11.E ~lnd Cr OSS Jrr'Ctl nn " 6f ChB mine aCCc^SS <br />road prepared by Ute }:ngineering and Surveying Company and <br />provided to us for this [:roject. P. minor mnc7ification of. this <br />stationing system has been made in the ~outhercn~ost bend of the <br />access road to accOrlmnrlate the mappinn of a uortiun of. the access <br />road.cut which does nnL fol. l.ota the center li:,~: of the roadwa;~.The <br />information contained un the mars an.ci pLOf]1C`y should f;e largely <br />self-explanatory. !lo~.~nvcr, in stnnmary, it •,;ouid appear that fr.orn <br />Station 10+00 to 22+00 iessential]y the entire .rppennost portion <br />of the access road) ti)e collu•.~ia1 co•:~er i ~ less than 10.E feet in <br />thickness and *_here .is no apparent r_xisting ].anc7lids type mash <br />wasting activity 'Therefore, it is on 1;' in the zone of <br />approximately 6+00 to ]0+00 tahcre a ~irLficicnt thicl:ncss of <br />colluvial soil is pre~er.t to indicate ~r potential for <br />instability. Indeed ,~itinin this zo!-ic, t,:u n'.rp:nra`_e land:_lide <br />features are pCCSCnt aboVC t}ir3 aCCeSS road. The :;OU the Cn mOSt Of <br />these features c7nes -Llyiicht in the access road cut ber_~:recn <br />approximatc.l.p stations 6i .0 t.n 7i 90. 'Che har~o nt the northern <br />most of the two Land:',l ide lobe:: sto}>s nhort nC the access marl <br />cut. <br />tdith regard to the c::is.tinu londslidc fcatur.~.•s, nu: mapping would <br />indicate that th(~y ha•ie regressed up the slo[:e to a r,oint where <br />they arc now impingi.nu ui,nn e::;-osed bcclrocF: mat~:rials at the <br />surface. It is our opinion that r.hey (rill li[:el. und~.rgo no <br />further hearlward mi.yraticn. Therefore, we Ceel their impact in <br />terms of disturbed area will not get siynificantl? greater over <br />time. Further, in considc•riny the nature of the er.isting slides, <br />The Reilronrl Stannn •: ~t;)r I~~L••"f'~ ~l llei~ a iIP'~ Illi•r~~~'i:,.p6•,~nn•rp;r'p'm ~Irln Aft<lrl'1 .1'1 rl'jl (i "1/11nn~7 <br />