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AMUEDO AND IVEY, INC. <br />WORLDWIDE GEOLOGICAL CONSULTgNTS <br />15554 W. 67TH AVENUE <br />ARVADA, COLORADO 80007-7047 <br />U.S.A. <br />TEL: 303/456-5848 <br />FAX: 303/456-5890 <br />PETROLEUM AND MINERAL EXPLORATION <br />ENGINEERING GEOLOGY AND PHOTOGEOLOGY <br />August 31, 1999 <br />Mr. Michael G. Altavilla, P.E. <br />Engineering Manager <br />Seneca Coal Company <br />P.O. Box 670 <br />Hayden Colorado 81639 <br />`.e' ~s~.r ~f y5.. III I V I II I II IIII III <br />•';? Doc Date:12/11/2001 <br />~~~~F~EStablishetl 1953 <br />JOHN B. IVEV, CPG, RG, PE <br />Re: Ground Stability, <br />Yoast Mine and Vicinity <br />Dear Mr. Altavilla: <br />This letter transmits our report Ground Stability Investigation, Yoast Mine and <br />Vicinity, Routt County, Colorado. This investigation is supplemental to our previous <br />engineering geology investigation conducted in 1993. <br />Briefly, the present study indicates that there are no stability problems appazent in <br />the azea. Seventeen areas mapped by others were reviewed, and with one possible <br />exception none ofthese was found to be a landslide. Mass wasting, including landslides, <br />soil creep, debris avalanches, and rockfall were not observed. None ofthese hazards is <br />expected with reasonable caze during construction and subsequent maintenance. <br />It has been a pleasure to revisit areas previously observed and mapped and to see <br />that excavation has not produced any unstable conditions or uncovered any previously <br />unseen hazards or potential hazards. <br />Respectfully submitted, <br />AMUEDO AND IVEY, INC. <br />~ 1E OF PROFf ~c.`•,,y~ <br />J B. Ivey, CPG s~`~ r'F\CPTE p'• ?~'y `~, <br />President ONN /y ' ~~u`~ 896 ,, <br />~p18rEq t - <br />a e„ ' ~ AIPG _ <br />* 9050 ,~`~,.. ..:.~-~~o~': <br />'A `I Op~~li'I p.•~V~ r'ic. <br />Owl c FO. SS:~',1P~ <br />y ~. -- <br />~f Sslu.. Al i°U~'~c~ <br />