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rJOV-02-99 02:13 PM Dorn R~-o.tly Miz <br />• <br />October 28, 199') <br />Durn 2rally Alin Corporation <br />P.O. I3ox r,3G <br />Fort ,tilurgan, Colorado 80701 <br />Attn: All. Uuug Dowling <br />Ito: Dorn Sand and Gravel Pit <br />Fort Morgan, Colorado <br />CE(' Pt'ujcct No. 3992018 <br />Mr. Dowling: <br />9~+8677443 <br />P. 02 <br />i' <br />•~N <br />~. <br />1 <br />EARTH ENGINEERING <br />CONSULTANTS, INC. <br />As reyuesl~d un Oetaber 27, 1999, a senior project engineer li~im I'.u'lll I n~incering <br />Cunsult,uun, Ine. (LCC) has observed the existing srde slop, un rho I)~~rn RLad}' Mix <br />sand :uxl ;;ra~cl hit located nor[h uf]nterstate',6 m nortllwst fort \for_.In ~~'L h,lvc also <br />rccia~wJ illy t,yu,gr:rphic map develupeJ b}' Odur Lngurrenn~ I~,r IIIL h.•I~~w hater <br />subgradc elu~'atiuns in this area. The lield ubscrvatruns .InJ rL~re~~ ~~ere r„mhletud Io <br />assess thr putenri,rl for instabiht}• in the existing ex~a~atrd slopes errarm ~ I,~,s of support <br />for the rnarby interstate highway. <br />The edge ul the ri~,hl-ol-way for i-76 is located rou~hf} parallel r~, tllr ,ulnh ~~lge ol'thu <br />Durn I:,a.ly Aiix grlvel pit at a distance of approximately Gu lu Hu icer .I~+:ry from the <br />top of bank location. based on the topographic information dc~~luped by Odur <br />C•nginccnng, the toe of the slope in this area is approximately another 9u to ]OD feet <br />beyond the n>p-of-bank tlevalion at a depth of approximately aU to ~a Icct below <br />surrounding ground surface. <br />The materials m the sand and gravel pit reportedly consist oC lino to ruarsc ,mtds and <br />gravel BesCd Jn JIl-Slle observation of the stockpiled maten.rl, ive csum~.rr an angle of <br />rcpusu on the sands and gravels to be on the order of ~10 t~, iU dcgrr~ ti lllr angle of <br />rchusu is approximately equal to the friction angle for grattnlar soils <br />CENTRE FOR ADJAYC ED TEC MH OLOG~ <br />2301 RESFIRCM 60ULE~ARD. SUITE 104 <br />FORT COLLINS COLOR<DO BOS 26 <br />r970, 224 1522 (F,va, 224-4564 <br /> <br />