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~- ~ iiiiiiiiiiiiiiuiii <br />' sss <br />1 ~ ROCKY MOUNTAIN GEOTECHNICAL <br />Achieving Harmony wrth Earch <br />Western Associated Coal Corp. <br />410 17th Street, Suite 2300 <br />Denver, CO 80202 <br />Attn: William S. Tate <br />~ Re: Rlue Ribbon Mine <br />Gentlemen: <br />December 31, 1981 <br />This letter will serve as an interim repor*_ regarding the geo- <br />technical. anal}psis in progress on the Blue Ribbon Mine bench till <br />and high wall. As of this date, all of the piezometer ir;stalla- <br />tions have beer: completed, and are in working order. Gradation <br />and pla:~ticity information has been provided for all of tt;e soil <br />types encountered during drilling. A monitoring system I;as been <br />installed on the existing landslide area, consisting of t:vo sep- <br />arate lines ir. the uppermost one-half of the slide area. r^ield <br />measurements ot; bedrock in the vicinity of the high wall have been <br />completed in preparation for a roc}:fa.ll study. Shear strength <br />testing on the bench Eill materials is in progress in preparation <br />for a stability analysis. The rocl:fall analysis and a preliminar}' <br />stability analysis will be forthcoming in the: not too distant <br />future. However, it is anticipated that the final stability analy- <br />sis will not be completed until such time as at least sir, months <br />worth of monitoring data has been collected or. site. <br />Providec9 with this letter are copies of the test boring logs, <br />piezometer installation sheets, soil test summary sheets for the <br />two soil types encountered, and a general location diagram indi- <br />cating the relative locations of piezometers, test boring;, and <br />slope monitoring points on site. <br />R'e hope this information will satisfy your immediate needs• Sho~:1d <br />you have any questions regarding any of the information provided to <br />date, please do not hesitate to contact our office. <br />Sincerely, <br />ROCKY PIOUNTAIN GEOTECHNICAL <br />iI ~~ <br />enneth L. (dyers, .E. <br />KLM/bm <br />encl. <br />!`" . <br />~. _ .. ~: <br />G~ST~.a. <br />P~ rU . <br />,.. . ~ '~~ <br />~ •`-` - ` <br />~' . <br />OFES '\O`r r <br />,F ~ ~ .~ <br />f~~•. tiC~ ~cE V <br />~ 9j - ~'J~,; j' <br />The Railroad Station .555 E. Pikes Peak Avenue, Suite 107. Colorado Springs, Colorado 80903 • (3037 634-1999 <br />