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III IIIIIIIIIIIIIIII <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dep. rlment of Natural Resources <br />1313 Sherman 51 ,Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 8663567 <br />FAX: (303) 83b8106 <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SA FETY <br />Bill Owens <br />DATE: January 24, 2001 Guvemor <br />Greg E. Walther <br />Execmwe Director <br />T0: Jim Burnell M¢haeld Enng <br />Divlslnn Duectrn <br />I -. ~ _..••~. <br />FROM: Jim Pendleton 'l,-,; ~'= <br />RE: "Mountain ompany LLC (MCC), West Elk Mine; Permit <br />C-80-007; 2000 addendum To 1997/98 Landslide Corrective <br />Measures Report" (Permit No: C-80-007) <br />I have reviewed the above referenced addendum report volume. This addendum <br />was prepared by Barr Engineering, acting as a contractor for Mountain Coal <br />Company. The addendum report contains sections updating each of the <br />appropriate subsections of the original landslide report prepared by Barr. <br />The report briefly summarizes the purpose and analytical technique used by Barr <br />Engineering. Basically, the report presents comparative stability evaluations for <br />the large landslide which occupies much of the original F-Seam surface facilities at <br />the West Elk Mine. The landslide has been determined to be a reactivated relic <br />geomorphological feature of the site. The activities of the mine, including <br />regrading, sumping and ponding of waters have caused the large landslide to <br />become reactivated, resulting in wide spread damage to the various surface <br />facilities. <br />The original report determined that the hillside was unstable and proposed a <br />selection of techniques with which to restabilize the affected area. Many bore <br />holes were completed to determine the orientation and extent of the actual failure <br />plane. Many of these bore holes were cased and completed as ground water <br />monitoring wells. Samples of the various bedrock and soils encountered were <br />sampled and laboratory tested to determine physical properties. Various <br />comparative stability analyses were then completed using this information. Barr <br />recommended the installation of various mechanical and hydraulic features to <br />assist in restabilizing the hill slope of the mined area. Dewatering wells, micropiles, <br />