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~ -, CONTRACTORS <br />ENGINEERS <br />~ DEVELOPERS <br />/G ; i _ _ <br />\ • ~?'~ .~r"v,•'~'Q;3.c~.1^.~.Z TC._l ~'°'~v~~~~f•iZ~~, _Z'o-~ <br />..,...r..;,. ~wy..,~_ la. <br />~~~` ~ <br />E%ECUTNE OFFICE <br />TWO MORRI$ON-KNUDSEN PLAZA <br />P O 80% ]808 i 8015E IDAHO 43729 i U S A <br />PHONE (20B~ Sad-5000 • TELEX 3fid433 <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 />HAYDEN GULCH COAL MINE <br />ROUTT COUNTY, COLORADO <br />C) Gentlemen: <br />• of i ~ ~~ o ~o o io ~~Q <br />999 O oio <br /> - <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 assumed for the analyses performed for <br />the investigation described in the July, 1981, report. <br />Material Properties <br />The method utilized to select geotechnical parameters was reviewed. Fur- <br />ther reduction of the strength of the materials in the spoil pile could not <br />be justified. The strength of the material below the spoil was also recon- <br />sidered. The source of information for this material is the report for the <br />Soil and Foundation Investigation for the Proposed Five Earthfilled Embank- <br />ments, Hayden Gulch Coal Mine, Routt County, Colorado. The report is dated <br />C <br />M133 <br />