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~ ~ <br /> <br />~II II~III~IIII~I II~ <br />Colorado Yampa Coal Company <br />A Subsidiary of Getty Coal Company <br />P.O. Box 774288 <br />Steamboat Springs, CO 80477 <br />(303) 8793800 <br />August 2, 1983 <br />Ms. Sandy Emrich <br />Colorado Mined Land <br />Reclamation Division <br />423 Centennial Building ~~~ <br />1313 Sherman Street ~ ''"'~_ ~ ~ . <br />Denver, Colorado 80203 `P', <br />r <br />Re: Evaluation of the Slump in Area 1, Permit 79-177 <br />Dear Sandy: <br />As you requested during your June 1983 mine inspection report, I <br />have been reviewing the past correspondence on the stability of the <br />hillside and the slump that occurred in 1982. <br />The slump that has occurred is located on the northwest portion of <br />the hillside in Area 1. Five springs exist along the base of the <br />hillside as delineated on the map entitled "Spring Location, Area 1, <br />Permit 79-177. All the springs are located below the low highwall where <br />the overburden was pushed in order to blend into the natural contour of <br />the site. <br />A visual observation of the slump area showed that a hummock was <br />created above the area during the overburden grading operation. This, <br />coupled with the spoil and soil being saturated at the toe of the slope <br />reduced the shear strength of the site causing the mass movement. <br />To alleviate the potential for mass movement and increase the shear <br />strength of the area, the Colorado Yampa Coal Company: 1) removed <br />topsoil from the site, 2) pushed overburden downslope to remove the top <br />loading, 3) compacted the toe of the slope, 4) redistributed topsoil, <br />and 5) reseeded the slump area. <br />There is not any sign of mass movement occurring on any other <br />portion of the hillside on Area 1. <br />Jim Pendleton's concern, expressed in his letter dated May 22, 1980, <br />seems to be directed towards the northeast portion of the hillside and <br />stability of the area above the Low highwall. <br /> <br />The actions taken to repair the slump in July 1983 should alleviate <br />the potential for mass movement on the area. <br />