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MOHHISCiN~KNUUSEN COMPANY, INC <br />..:..~:~~OCIIt.n IC 11: .T 1: .Ci V.1'e:l`(un: ....- .._ . ... .... .. ... ... .. ....L_n-. ......-. ..... .. ~...... ...._ ._.._ ._. <br /> <br />Geotechnical Investigation <br /> <br /> <br />of the '~~ <br />Overburden Dump Area , `;;• <br />Hayden Gulch Coal dine <br />Routt County, Colorado <br />,~ ~~ <br />:;SUMMARY <br />•, }. <br />• ~ ~;a, <br />A geotechnical investigation of the overburden dump area was performed in ,;:.c~` <br />general compliance with the proposal of April 30, 1981. '~~~ <br />"~.~~ <br />A site reconnaissance was performed. No signs of instability were found in <br />the reclaimed area. <br />~'~ ~. <br />~_ i'listy~*analyses were performed~rfor' the highest slope pr,esenting;rthe <br />,greatest hazard in the reclaimed area. A minimum factor, of safety of 2.1 <br />,~was_calculated.: <br />More detailed observations and the methodology employed are presented in <br />the body of this report. <br />SCOPE OF WORK <br />LJ <br />The scope of work consisted of a review of existing drilling records, <br />geological data, reclamation plans, and consultants' reports; afield visit ,;.,;: <br />to examine the waste dump and attempt to estimate in-situ densities; a <br />slope stability study utilizing existing data supplemented by any field <br />measurements obtained; and the compilation of the present report. <br />EXISTING DATA REVIEW ~" <br />:',. <br />,r{: <br />The information extant, made available by various parties for'our review ;'~~s''_~.. <br />• ,. <br />and use in this investigation included geotechnical reports by Chen & <br />Associates, Inc., for various phases of mine development, log of borings <br />drilled for coal exploration, and topographic survey data. <br />-1- <br />