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) CONTRACTORS <br /> ENGINEERS <br /> DEVELOPERS <br />t`~ ~o~ <br />~wJ' MORRISON-KNUDSEN COMPANY, INC. <br /> ExECU7IVE OFFICE <br /> iW0 MOR RISON-KNUp6EN PLAZA <br /> P O. RO% 7806 /BOISE. IDAHO 83 /29 / U S A <br /> PHONE X206) 7~6-5000/ 7ELE% 966A79 <br /> <br />October 21, 1981 <br />H-G Coal Company <br />333 Quebec Street <br />Denver, CO 80210 <br />Attention: Mr. Cass Legal <br />~;~~ Subject: ADDENDUM TO GEOTECHNICAL INVESTIGATION REPORT <br />`' INVESTIGATION OF OVERBURDEN DUMP AREA <br />HAVDEN•GULCH COAL MINE <br />ROUTT COUNTY, COLORADO <br />Gentlemen: <br />i ~~ <br />i <br />i~irii r <br />iiira~ir~i <br />999 <br />This letter represents an addendum to the geotechnical investigation report <br />for the investigation of the overburden dump area at the Hayden Gulch Mine <br />in Routt County, Colorado. The original report was transmitted July <br />29, 1981. <br />This addendum presents the results of further consideration of the material <br />properties and hydrologic conditions asswned for the analyses performed for <br />the investigation described in the July, 1981, report. <br />'a o;er ~e <br />The method utilize to select geotechnical parameters was reviewed. Fur- <br />ther reduction of the stren th of the materials in the spoil pile could not <br />be justified. reap i.~ o~. ei~"._ ,,~m~a^s'~a'hl~eJ'ao~ <br />oi~.,lnves'tigation for t17e' Proposed ~five~r~a'i:>y <br />~I . <br />ch Coal Mine, Routt ~C.ounty., Colorado... Th,e <br /> <br />M133 <br />I~ ~ III ~-{, ~1~~~'I J~ I <br />